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    57. 

  57.             
    58. 

  58.   <div class="section" id="examples">
    59. 

  59. <h1>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h1>
    60. 

  60. <div class="section" id="timer">
    61. 

  61. <h2>Timer<a class="headerlink" href="#timer" title="Permalink to this headline">¶</a></h2>
    62. 

  62. <p>This example demonstrates the timed behavior of SCCD. It does not have dynamic structure.</p>
    63. 

  63. <p>We model a clock which prints the current time every 0.05 seconds. Two clocks are printed: the current wall-clock time and the current simulated time. We expect both to (almost) be the same. The user can interrupt the clock by sending an &#8220;interrupt&#8221; event. The user can resume the clock by sending a &#8220;resume&#8221; event.</p>
    64. 

  64. <div class="section" id="threads-python">
    65. 

  65. <h3>Threads (Python)<a class="headerlink" href="#threads-python" title="Permalink to this headline">¶</a></h3>
    66. 

  66. <p>In this version, the model sends the current times to an output port, on which the user listens, to print out these times. <em>self.getSimulatedTime()</em> and <em>time()</em> return the current time in milliseconds, which we have to convert to seconds.</p>
    67. 

  67. <p>The SCCD model:</p>
    68. 

  68. <div class="highlight-default"><div class="highlight"><pre>&lt;?xml version=&quot;1.0&quot; ?&gt;
    69. 

  69. &lt;diagram author=&quot;Simon Van Mierlo&quot; name=&quot;Timer (Threaded Version)&quot;&gt;
    70. 

  70.     &lt;top&gt;
    71. 

  71.         from sccd.runtime.accurate_time import time
    72. 

  72.     &lt;/top&gt;
    73. 

  73. 

  74.     &lt;inport name=&quot;input&quot; /&gt;
    75. 

  75.     &lt;outport name=&quot;output&quot; /&gt;
    76. 

  76. 

  77.     &lt;class name=&quot;MainApp&quot; default=&quot;true&quot;&gt;
    78. 

  78.         &lt;scxml initial=&quot;running&quot;&gt;
    79. 

  79.             &lt;state id=&quot;running&quot;&gt;
    80. 

  80.                 &lt;transition target=&quot;.&quot; after=&quot;0.05&quot;&gt;
    81. 

  81.                     &lt;raise event=&quot;time_update&quot; port=&quot;output&quot;&gt;
    82. 

  82.                         &lt;parameter expr=&quot;self.getSimulatedTime()&quot; /&gt;
    83. 

  83.                         &lt;parameter expr=&quot;time()&quot; /&gt;
    84. 

  84.                     &lt;/raise&gt;
    85. 

  85.                 &lt;/transition&gt;
    86. 

  86.                 &lt;transition target=&quot;../interrupted&quot; event=&quot;interrupt&quot; port=&quot;input&quot;&gt;
    87. 

  87.                     &lt;raise event=&quot;time_update&quot; port=&quot;output&quot;&gt;
    88. 

  88.                         &lt;parameter expr=&quot;self.getSimulatedTime()&quot; /&gt;
    89. 

  89.                         &lt;parameter expr=&quot;time()&quot; /&gt;
    90. 

  90.                     &lt;/raise&gt;
    91. 

  91.                 &lt;/transition&gt;
    92. 

  92.             &lt;/state&gt;
    93. 

  93.             &lt;state id=&quot;interrupted&quot;&gt;
    94. 

  94.                 &lt;transition target=&quot;.&quot; event=&quot;interrupt&quot; port=&quot;input&quot;&gt;
    95. 

  95.                     &lt;raise event=&quot;time_update&quot; port=&quot;output&quot;&gt;
    96. 

  96.                         &lt;parameter expr=&quot;self.getSimulatedTime()&quot; /&gt;
    97. 

  97.                         &lt;parameter expr=&quot;time()&quot; /&gt;
    98. 

  98.                     &lt;/raise&gt;
    99. 

  99.                 &lt;/transition&gt;
    100. 

  100.                 &lt;transition target=&quot;../running&quot; event=&quot;continue&quot; port=&quot;input&quot;&gt;
    101. 

  101.                     &lt;raise event=&quot;time_update&quot; port=&quot;output&quot;&gt;
    102. 

  102.                         &lt;parameter expr=&quot;self.getSimulatedTime()&quot; /&gt;
    103. 

  103.                         &lt;parameter expr=&quot;time()&quot; /&gt;
    104. 

  104.                     &lt;/raise&gt;
    105. 

  105.                 &lt;/transition&gt;
    106. 

  106.             &lt;/state&gt;
    107. 

  107.         &lt;/scxml&gt;
    108. 

  108.     &lt;/class&gt;
    109. 

  109. &lt;/diagram&gt;
    110. 

  110. </pre></div>
    111. 

  111. </div>
    112. 

  112. <p>To compile, save this in a file called <code class="docutils literal"><span class="pre">timer.xml</span></code> and run <code class="docutils literal"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">sccd.compiler.sccdc</span> <span class="pre">-p</span> <span class="pre">threads</span> <span class="pre">-l</span> <span class="pre">python</span> <span class="pre">timer.xml</span></code></p>
    113. 

  113. <p>Then, the following file will run the model:</p>
    114. 

  114. <div class="highlight-default"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">timer</span>
    115. 

  115. <span class="kn">from</span> <span class="nn">sccd.runtime.statecharts_core</span> <span class="k">import</span> <span class="n">Event</span>
    116. 

  116. <span class="kn">import</span> <span class="nn">threading</span>
    117. 

  117. 

  118. <span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span>
    119. 

  119.     <span class="n">controller</span> <span class="o">=</span> <span class="n">timer</span><span class="o">.</span><span class="n">Controller</span><span class="p">()</span>
    120. 

  120. 

  121.     <span class="k">def</span> <span class="nf">raw_inputter</span><span class="p">():</span>
    122. 

  122.         <span class="k">while</span> <span class="mi">1</span><span class="p">:</span>
    123. 

  123.             <span class="n">controller</span><span class="o">.</span><span class="n">addInput</span><span class="p">(</span><span class="n">Event</span><span class="p">(</span><span class="n">raw_input</span><span class="p">(),</span> <span class="s">&quot;input&quot;</span><span class="p">,</span> <span class="p">[]))</span>
    124. 

  124.     <span class="n">input_thread</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">raw_inputter</span><span class="p">)</span>
    125. 

  125.     <span class="n">input_thread</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="k">True</span>
    126. 

  126.     <span class="n">input_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    127. 

  127. 

  128.     <span class="n">output_listener</span> <span class="o">=</span> <span class="n">controller</span><span class="o">.</span><span class="n">addOutputListener</span><span class="p">([</span><span class="s">&quot;output&quot;</span><span class="p">])</span>
    129. 

  129.     <span class="k">def</span> <span class="nf">outputter</span><span class="p">():</span>
    130. 

  130.         <span class="k">while</span> <span class="mi">1</span><span class="p">:</span>
    131. 

  131.             <span class="n">event</span> <span class="o">=</span> <span class="n">output_listener</span><span class="o">.</span><span class="n">fetch</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
    132. 

  132.             <span class="nb">print</span> <span class="s">&quot;SIMTIME: %.2fs&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">getParameters</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span> <span class="o">/</span> <span class="mf">1000.0</span><span class="p">)</span>
    133. 

  133.             <span class="nb">print</span> <span class="s">&quot;ACTTIME: %.2fs&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">getParameters</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span> <span class="o">/</span> <span class="mf">1000.0</span><span class="p">)</span>
    134. 

  134.     <span class="n">output_thread</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">outputter</span><span class="p">)</span>
    135. 

  135.     <span class="n">output_thread</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="k">True</span>
    136. 

  136.     <span class="n">output_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    137. 

  137. 

  138.     <span class="n">controller</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    139. 

  139. </pre></div>
    140. 

  140. </div>
    141. 

  141. <p>The time will be printed to the console. The user can send events by typing the string &#8220;interrupt&#8221; or &#8220;continue&#8221; in the console.</p>
    142. 

  142. </div>
    143. 

  143. <div class="section" id="eventloop-python">
    144. 

  144. <h3>Eventloop (Python)<a class="headerlink" href="#eventloop-python" title="Permalink to this headline">¶</a></h3>
    145. 

  145. <p>The SCCD model:</p>
    146. 

  146. <div class="highlight-default"><div class="highlight"><pre>&lt;?xml version=&quot;1.0&quot; ?&gt;
    147. 

  147. &lt;diagram author=&quot;Simon Van Mierlo&quot; name=&quot;Timer (Eventloop Version)&quot;&gt;
    148. 

  148.     &lt;top&gt;
    149. 

  149.         from sccd.runtime.libs.ui import ui
    150. 

  150.         from sccd.runtime.accurate_time import time
    151. 

  151.     &lt;/top&gt;
    152. 

  152. 

  153.     &lt;inport name=&quot;ui&quot; /&gt;
    154. 

  154. 

  155.     &lt;class name=&quot;MainApp&quot; default=&quot;true&quot;&gt;
    156. 

  156.         &lt;method name=&quot;MainApp&quot;&gt;
    157. 

  157.             &lt;body&gt;
    158. 

  158.                 &lt;![CDATA[
    159. 

  159.                 self.canvas = ui.append_canvas(ui.window,100,100,{&#39;background&#39;:&#39;#eee&#39;})
    160. 

  160.                 self.clock_text = self.canvas.element.create_text(25,25,{&#39;text&#39;:&#39;0.0&#39;})
    161. 

  161.                 self.actual_clock_text = self.canvas.element.create_text(25,50,{&#39;text&#39;:&#39;0.0&#39;})
    162. 

  162.                 interrupt_button = ui.append_button(ui.window, &#39;INTERRUPT&#39;);
    163. 

  163.                 continue_button = ui.append_button(ui.window, &#39;CONTINUE&#39;);
    164. 

  164.                 ui.bind_event(interrupt_button.element, ui.EVENTS.MOUSE_CLICK, self.controller, &#39;interrupt_clicked&#39;);
    165. 

  165.                 ui.bind_event(continue_button.element, ui.EVENTS.MOUSE_CLICK, self.controller, &#39;continue_clicked&#39;);
    166. 

  166.                 ]]&gt;
    167. 

  167.             &lt;/body&gt;
    168. 

  168.         &lt;/method&gt;
    169. 

  169.         &lt;method name=&quot;update_timers&quot;&gt;
    170. 

  170.             &lt;body&gt;
    171. 

  171.                 self.canvas.element.itemconfigure(self.clock_text, text=str(&#39;%.2f&#39; % (self.getSimulatedTime() / 1000.0)))
    172. 

  172.                 self.canvas.element.itemconfigure(self.actual_clock_text, text=&#39;%.2f&#39; % (time() / 1000.0))
    173. 

  173.             &lt;/body&gt;
    174. 

  174.         &lt;/method&gt;
    175. 

  175.         &lt;scxml initial=&quot;running&quot;&gt;
    176. 

  176.             &lt;state id=&quot;running&quot;&gt;
    177. 

  177.                 &lt;transition target=&quot;.&quot; after=&quot;0.05&quot;&gt;
    178. 

  178.                     &lt;script&gt;
    179. 

  179.                         self.update_timers()
    180. 

  180.                     &lt;/script&gt;
    181. 

  181.                 &lt;/transition&gt;
    182. 

  182.                 &lt;transition target=&quot;../interrupted&quot; event=&quot;interrupt_clicked&quot; port=&quot;ui&quot;&gt;
    183. 

  183.                     &lt;script&gt;
    184. 

  184.                         self.update_timers()
    185. 

  185.                     &lt;/script&gt;
    186. 

  186.                 &lt;/transition&gt;
    187. 

  187.             &lt;/state&gt;
    188. 

  188.             &lt;state id=&quot;interrupted&quot;&gt;
    189. 

  189.                 &lt;transition target=&quot;.&quot; event=&quot;interrupt_clicked&quot; port=&quot;ui&quot;&gt;
    190. 

  190.                     &lt;script&gt;
    191. 

  191.                         self.update_timers()
    192. 

  192.                     &lt;/script&gt;
    193. 

  193.                 &lt;/transition&gt;
    194. 

  194.                 &lt;transition target=&quot;../running&quot; event=&quot;continue_clicked&quot; port=&quot;ui&quot;&gt;
    195. 

  195.                     &lt;script&gt;
    196. 

  196.                         self.update_timers()
    197. 

  197.                     &lt;/script&gt;
    198. 

  198.                 &lt;/transition&gt;
    199. 

  199.             &lt;/state&gt;
    200. 

  200.         &lt;/scxml&gt;
    201. 

  201.     &lt;/class&gt;
    202. 

  202. &lt;/diagram&gt;
    203. 

  203. </pre></div>
    204. 

  204. </div>
    205. 

  205. <p>To compile, save this in a file called <code class="docutils literal"><span class="pre">timer.xml</span></code> and run <code class="docutils literal"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">sccd.compiler.sccdc</span> <span class="pre">-p</span> <span class="pre">eventloop</span> <span class="pre">-l</span> <span class="pre">python</span> <span class="pre">timer.xml</span></code></p>
    206. 

  206. <p>Then, the following file will run the model:</p>
    207. 

  207. <div class="highlight-default"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">Tkinter</span> <span class="k">as</span> <span class="nn">tk</span>
    208. 

  208. <span class="kn">import</span> <span class="nn">timer</span>
    209. 

  209. <span class="kn">from</span> <span class="nn">sccd.runtime.libs.ui</span> <span class="k">import</span> <span class="n">ui</span>
    210. 

  210. <span class="kn">from</span> <span class="nn">sccd.runtime.statecharts_core</span> <span class="k">import</span> <span class="n">Event</span>
    211. 

  211. <span class="kn">from</span> <span class="nn">sccd.runtime.tkinter_eventloop</span> <span class="k">import</span> <span class="o">*</span>
    212. 

  212. 

  213. <span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span>
    214. 

  214.     <span class="n">ui</span><span class="o">.</span><span class="n">window</span> <span class="o">=</span> <span class="n">tk</span><span class="o">.</span><span class="n">Tk</span><span class="p">()</span>
    215. 

  215. 

  216.     <span class="n">controller</span> <span class="o">=</span> <span class="n">timer</span><span class="o">.</span><span class="n">Controller</span><span class="p">(</span><span class="n">TkEventLoop</span><span class="p">(</span><span class="n">ui</span><span class="o">.</span><span class="n">window</span><span class="p">))</span>
    217. 

  217.     <span class="n">controller</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    218. 

  218.     <span class="n">ui</span><span class="o">.</span><span class="n">window</span><span class="o">.</span><span class="n">mainloop</span><span class="p">()</span>
    219. 

  219. </pre></div>
    220. 

  220. </div>
    221. 

  221. </div>
    222. 

  222. <div class="section" id="eventloop-javascript">
    223. 

  223. <h3>Eventloop (Javascript)<a class="headerlink" href="#eventloop-javascript" title="Permalink to this headline">¶</a></h3>
    224. 

  224. <p>The SCCD model:</p>
    225. 

  225. <div class="highlight-default"><div class="highlight"><pre>&lt;?xml version=&quot;1.0&quot; ?&gt;
    226. 

  226. &lt;diagram author=&quot;Simon Van Mierlo&quot; name=&quot;Timer&quot;&gt;
    227. 

  227.     &lt;inport name=&quot;ui&quot; /&gt;
    228. 

  228. 

  229.     &lt;class name=&quot;MainApp&quot; default=&quot;true&quot;&gt;
    230. 

  230.         &lt;method name=&quot;MainApp&quot;&gt;
    231. 

  231.             &lt;body&gt;
    232. 

  232.                 &lt;![CDATA[
    233. 

  233.                 this.canvas = ui.append_canvas(ui.window,400,150,{&#39;background&#39;:&#39;#eee&#39;})
    234. 

  234.                 this.clock_text = this.canvas.add_text(25,25,&#39;0.0&#39;)
    235. 

  235.                 this.actual_clock_text = this.canvas.add_text(25,50,&#39;0.0&#39;)
    236. 

  236.                 var interrupt_button = ui.append_button(ui.window, &#39;INTERRUPT&#39;);
    237. 

  237.                 var continue_button = ui.append_button(ui.window, &#39;CONTINUE&#39;);
    238. 

  238.                 ui.bind_event(interrupt_button.element, ui.EVENTS.MOUSE_CLICK, this.controller, &#39;interrupt_clicked&#39;);
    239. 

  239.                 ui.bind_event(continue_button.element, ui.EVENTS.MOUSE_CLICK, this.controller, &#39;continue_clicked&#39;);
    240. 

  240.                 ]]&gt;
    241. 

  241.             &lt;/body&gt;
    242. 

  242.         &lt;/method&gt;
    243. 

  243.         &lt;method name=&quot;update_timers&quot;&gt;
    244. 

  244.             &lt;body&gt;
    245. 

  245.                 this.clock_text.set_text((this.getSimulatedTime() / 1000).toFixed(2));
    246. 

  246.                 this.actual_clock_text.set_text((this.getSimulatedTime() / 1000).toFixed(2));
    247. 

  247.             &lt;/body&gt;
    248. 

  248.         &lt;/method&gt;
    249. 

  249.         &lt;scxml initial=&quot;running&quot;&gt;
    250. 

  250.             &lt;state id=&quot;running&quot;&gt;
    251. 

  251.                 &lt;transition target=&quot;.&quot; after=&quot;0.05&quot;&gt;
    252. 

  252.                     &lt;script&gt;
    253. 

  253.                         this.update_timers();
    254. 

  254.                     &lt;/script&gt;
    255. 

  255.                 &lt;/transition&gt;
    256. 

  256.                 &lt;transition target=&quot;../interrupted&quot; event=&quot;interrupt_clicked&quot; port=&quot;ui&quot;&gt;
    257. 

  257.                     &lt;script&gt;
    258. 

  258.                         this.update_timers();
    259. 

  259.                     &lt;/script&gt;
    260. 

  260.                 &lt;/transition&gt;
    261. 

  261.             &lt;/state&gt;
    262. 

  262.             &lt;state id=&quot;interrupted&quot;&gt;
    263. 

  263.                 &lt;transition target=&quot;.&quot; event=&quot;interrupt_clicked&quot; port=&quot;ui&quot;&gt;
    264. 

  264.                     &lt;script&gt;
    265. 

  265.                         this.update_timers();
    266. 

  266.                     &lt;/script&gt;
    267. 

  267.                 &lt;/transition&gt;
    268. 

  268.                 &lt;transition target=&quot;../running&quot; event=&quot;continue_clicked&quot; port=&quot;ui&quot;&gt;
    269. 

  269.                     &lt;script&gt;
    270. 

  270.                         this.update_timers();
    271. 

  271.                     &lt;/script&gt;
    272. 

  272.                 &lt;/transition&gt;
    273. 

  273.             &lt;/state&gt;
    274. 

  274.         &lt;/scxml&gt;
    275. 

  275.     &lt;/class&gt;
    276. 

  276. &lt;/diagram&gt;
    277. 

  277. </pre></div>
    278. 

  278. </div>
    279. 

  279. <p>To compile, save this in a file called <code class="docutils literal"><span class="pre">timer.xml</span></code> and run <code class="docutils literal"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">sccd.compiler.sccdc</span> <span class="pre">-p</span> <span class="pre">eventloop</span> <span class="pre">-l</span> <span class="pre">javascript</span> <span class="pre">timer.xml</span></code></p>
    280. 

  280. <p>Then, the following file will run the model:</p>
    281. 

  281. <div class="highlight-default"><div class="highlight"><pre><span class="o">&lt;</span><span class="n">div</span><span class="o">&gt;</span>
    282. 

  282.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/HackTimer.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    283. 

  283.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/statecharts_core.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    284. 

  284.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/utils.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    285. 

  285.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/svg.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    286. 

  286.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/ui.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    287. 

  287.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;timer.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    288. 

  288.     <span class="o">&lt;</span><span class="n">script</span><span class="o">&gt;</span>
    289. 

  289.         <span class="n">controller</span> <span class="o">=</span> <span class="n">new</span> <span class="n">Timer</span><span class="o">.</span><span class="n">Controller</span><span class="p">(</span><span class="n">new</span> <span class="n">JsEventLoop</span><span class="p">());</span>
    290. 

  290.         <span class="n">controller</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
    291. 

  291.     <span class="o">&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    292. 

  292. <span class="o">&lt;/</span><span class="n">div</span><span class="o">&gt;</span>
    293. 

  293. </pre></div>
    294. 

  294. </div>
    295. 

  295. </div>
    296. 

  296. </div>
    297. 

  297. <div class="section" id="traffic-lights">
    298. 

  298. <h2>Traffic Lights<a class="headerlink" href="#traffic-lights" title="Permalink to this headline">¶</a></h2>
    299. 

  299. <p>The traffic lights example demonstrates most functionality of SCCD. There are three lights (green, yellow, and red). The traffic light autonomously switches between them, but also listens for a police interrupt, which will flash the yellow light. When a second interrupt comes in, the light returns to its last configuration (using a history state).</p>
    300. 

  300. <div class="section" id="python">
    301. 

  301. <h3>Python<a class="headerlink" href="#python" title="Permalink to this headline">¶</a></h3>
    302. 

  302. <p>The SCCD model:</p>
    303. 

  303. <div class="highlight-default"><div class="highlight"><pre>&lt;?xml version=&quot;1.0&quot; ?&gt;
    304. 

  304. &lt;diagram author=&quot;Raphael Mannadiar&quot; name=&quot;Traffic_Light_Python_Version&quot;&gt;
    305. 

  305.     &lt;top&gt;
    306. 

  306.         from sccd.runtime.libs.ui import ui
    307. 

  307.     &lt;/top&gt;
    308. 

  308. 

  309.     &lt;inport name=&quot;ui&quot; /&gt;
    310. 

  310. 

  311.     &lt;class name=&quot;MainApp&quot; default=&quot;true&quot;&gt;
    312. 

  312.         &lt;relationships&gt;
    313. 

  313.             &lt;association name=&quot;trafficlight&quot; class=&quot;TrafficLight&quot; /&gt;
    314. 

  314.         &lt;/relationships&gt;
    315. 

  315.         &lt;method name=&quot;MainApp&quot;&gt;
    316. 

  316.             &lt;body&gt;
    317. 

  317.                 &lt;![CDATA[
    318. 

  318.                 self.canvas   = ui.append_canvas(ui.window,100,310,{&#39;background&#39;:&#39;#eee&#39;});
    319. 

  319.                 police_button = ui.append_button(ui.window, &#39;Police interrupt&#39;);
    320. 

  320.                 quit_button   = ui.append_button(ui.window, &#39;Quit&#39;);
    321. 

  321.                 ui.bind_event(police_button.element, ui.EVENTS.MOUSE_CLICK, self.controller, &#39;police_interrupt_clicked&#39;);
    322. 

  322.                 ui.bind_event(quit_button.element,      ui.EVENTS.MOUSE_CLICK, self.controller, &#39;quit_clicked&#39;);
    323. 

  323.                 ]]&gt;
    324. 

  324.             &lt;/body&gt;
    325. 

  325.         &lt;/method&gt;
    326. 

  326.         &lt;scxml initial=&quot;initializing&quot;&gt;
    327. 

  327.             &lt;state id=&quot;initializing&quot;&gt;
    328. 

  328.                 &lt;transition target=&quot;../creating&quot;&gt;
    329. 

  329.                     &lt;raise scope=&quot;cd&quot; event=&quot;create_instance&quot;&gt;
    330. 

  330.                         &lt;parameter expr=&#39;&quot;trafficlight&quot;&#39; /&gt;
    331. 

  331.                         &lt;parameter expr=&#39;&quot;TrafficLight&quot;&#39; /&gt;
    332. 

  332.                         &lt;parameter expr=&quot;self.canvas&quot; /&gt;
    333. 

  333.                     &lt;/raise&gt;
    334. 

  334.                 &lt;/transition&gt;
    335. 

  335.             &lt;/state&gt;
    336. 

  336.             &lt;state id=&quot;creating&quot;&gt;
    337. 

  337.                 &lt;transition event=&quot;instance_created&quot; target=&quot;../initialized&quot;&gt;
    338. 

  338.                     &lt;parameter name=&quot;association_name&quot; type=&quot;string&quot;/&gt;
    339. 

  339.                     &lt;raise scope=&quot;cd&quot; event=&quot;start_instance&quot;&gt;
    340. 

  340.                         &lt;parameter expr=&quot;association_name&quot; /&gt;
    341. 

  341.                     &lt;/raise&gt;
    342. 

  342.                     &lt;raise scope=&quot;narrow&quot; event=&quot;set_association_name&quot; target=&quot;association_name&quot;&gt;
    343. 

  343.                         &lt;parameter expr=&quot;association_name&quot; /&gt;
    344. 

  344.                     &lt;/raise&gt;
    345. 

  345.                 &lt;/transition&gt;
    346. 

  346.             &lt;/state&gt;
    347. 

  347.             &lt;state id=&quot;initialized&quot;&gt;
    348. 

  348.             &lt;/state&gt;
    349. 

  349.         &lt;/scxml&gt;
    350. 

  350.     &lt;/class&gt;
    351. 

  351. 

  352.     &lt;class name=&quot;TrafficLight&quot;&gt;
    353. 

  353.         &lt;relationships&gt;
    354. 

  354.         &lt;/relationships&gt;
    355. 

  355.         &lt;method name=&quot;TrafficLight&quot;&gt;
    356. 

  356.             &lt;parameter name=&quot;canvas&quot; /&gt;
    357. 

  357.             &lt;body&gt;
    358. 

  358.                 &lt;![CDATA[
    359. 

  359.                 size        = 100;
    360. 

  360.                 offset      = size+5;
    361. 

  361.                 self.RED    = 0;
    362. 

  362.                 self.YELLOW = 1;
    363. 

  363.                 self.GREEN  = 2;
    364. 

  364.                 self.colors = [&#39;#f00&#39;,&#39;#ff0&#39;,&#39;#0f0&#39;]
    365. 

  365.                 self.lights = [
    366. 

  366.                     canvas.add_rectangle(size/2, size/2, size, size, {&#39;fill&#39;:&#39;#000&#39;}),
    367. 

  367.                     canvas.add_rectangle(size/2, size/2+offset,     size, size, {&#39;fill&#39;:&#39;#000&#39;}),
    368. 

  368.                     canvas.add_rectangle(size/2, size/2+2*offset, size, size, {&#39;fill&#39;:&#39;#000&#39;})];
    369. 

  369.                 ]]&gt;
    370. 

  370.             &lt;/body&gt;
    371. 

  371.         &lt;/method&gt;
    372. 

  372.         &lt;method name=&quot;clear&quot;&gt;
    373. 

  373.             &lt;body&gt;
    374. 

  374.                 &lt;![CDATA[
    375. 

  375.                 self.lights[self.RED].set_color(&#39;#000&#39;);
    376. 

  376.                 self.lights[self.YELLOW].set_color(&#39;#000&#39;);
    377. 

  377.                 self.lights[self.GREEN].set_color(&#39;#000&#39;);
    378. 

  378.                 ]]&gt;
    379. 

  379.             &lt;/body&gt;
    380. 

  380.         &lt;/method&gt;
    381. 

  381.         &lt;method name=&quot;setGreen&quot;&gt;
    382. 

  382.             &lt;body&gt;
    383. 

  383.                 &lt;![CDATA[
    384. 

  384.                 self.clear();
    385. 

  385.                 self.lights[self.GREEN].set_color(self.colors[self.GREEN]);
    386. 

  386.                 ]]&gt;
    387. 

  387.             &lt;/body&gt;
    388. 

  388.         &lt;/method&gt;
    389. 

  389.         &lt;method name=&quot;setYellow&quot;&gt;
    390. 

  390.             &lt;body&gt;
    391. 

  391.                 &lt;![CDATA[
    392. 

  392.                 self.clear();
    393. 

  393.                 self.lights[self.YELLOW].set_color(self.colors[self.YELLOW]);
    394. 

  394.                 ]]&gt;
    395. 

  395.             &lt;/body&gt;
    396. 

  396.         &lt;/method&gt;
    397. 

  397.         &lt;method name=&quot;setRed&quot;&gt;
    398. 

  398.             &lt;body&gt;
    399. 

  399.                 &lt;![CDATA[
    400. 

  400.                 self.clear();
    401. 

  401.                 self.lights[self.RED].set_color(self.colors[self.RED]);
    402. 

  402.                 ]]&gt;
    403. 

  403.             &lt;/body&gt;
    404. 

  404.         &lt;/method&gt;
    405. 

  405.         &lt;scxml initial=&quot;on&quot;&gt;
    406. 

  406.             &lt;state id=&quot;on&quot; initial=&quot;normal&quot;&gt;
    407. 

  407.                 &lt;state id=&quot;normal&quot; initial=&quot;red&quot;&gt;
    408. 

  408.                     &lt;state id=&quot;red&quot;&gt;
    409. 

  409.                         &lt;onentry&gt;
    410. 

  410.                             &lt;script&gt;
    411. 

  411.                                 &lt;![CDATA[
    412. 

  412.                                 self.setRed();
    413. 

  413.                                 ]]&gt;
    414. 

  414.                             &lt;/script&gt;
    415. 

  415.                         &lt;/onentry&gt;
    416. 

  416.                         &lt;transition after=&#39;3&#39; target=&#39;../green&#39;/&gt;
    417. 

  417.                     &lt;/state&gt;
    418. 

  418.                     &lt;state id=&quot;green&quot;&gt;
    419. 

  419.                         &lt;onentry&gt;
    420. 

  420.                             &lt;script&gt;
    421. 

  421.                                 &lt;![CDATA[
    422. 

  422.                                 self.setGreen();
    423. 

  423.                                 ]]&gt;
    424. 

  424.                             &lt;/script&gt;
    425. 

  425.                         &lt;/onentry&gt;
    426. 

  426.                         &lt;transition after=&#39;2&#39; target=&#39;../yellow&#39;/&gt;
    427. 

  427.                     &lt;/state&gt;
    428. 

  428.                     &lt;state id=&quot;yellow&quot;&gt;
    429. 

  429.                         &lt;onentry&gt;
    430. 

  430.                             &lt;script&gt;
    431. 

  431.                                 &lt;![CDATA[
    432. 

  432.                                 self.setYellow();
    433. 

  433.                                 ]]&gt;
    434. 

  434.                             &lt;/script&gt;
    435. 

  435.                         &lt;/onentry&gt;
    436. 

  436.                     &lt;transition after=&#39;1&#39; target=&#39;../red&#39;/&gt;
    437. 

  437.                     &lt;/state&gt;
    438. 

  438.                     &lt;transition event=&#39;police_interrupt_clicked&#39; port=&#39;ui&#39; target=&#39;../interrupted&#39;/&gt;
    439. 

  439.                     &lt;history id=&quot;history&quot;/&gt;
    440. 

  440.                 &lt;/state&gt;
    441. 

  441.                 &lt;state id=&quot;interrupted&quot; initial=&quot;yellow&quot;&gt;
    442. 

  442.                     &lt;state id=&quot;yellow&quot;&gt;
    443. 

  443.                         &lt;onentry&gt;
    444. 

  444.                             &lt;script&gt;
    445. 

  445.                                 &lt;![CDATA[
    446. 

  446.                                 self.setYellow();
    447. 

  447.                                 ]]&gt;
    448. 

  448.                             &lt;/script&gt;
    449. 

  449.                         &lt;/onentry&gt;
    450. 

  450.                         &lt;transition after=&#39;.5&#39; target=&#39;../black&#39;/&gt;
    451. 

  451.                     &lt;/state&gt;
    452. 

  452.                     &lt;state id=&quot;black&quot;&gt;
    453. 

  453.                         &lt;onentry&gt;
    454. 

  454.                             &lt;script&gt;
    455. 

  455.                                 &lt;![CDATA[
    456. 

  456.                                 self.clear();
    457. 

  457.                                 ]]&gt;
    458. 

  458.                             &lt;/script&gt;
    459. 

  459.                         &lt;/onentry&gt;
    460. 

  460.                         &lt;transition after=&#39;.5&#39; target=&#39;../yellow&#39;/&gt;
    461. 

  461.                     &lt;/state&gt;
    462. 

  462.                     &lt;transition event=&#39;police_interrupt_clicked&#39; port=&#39;ui&#39; target=&#39;../normal/history&#39;/&gt;
    463. 

  463.                 &lt;/state&gt;
    464. 

  464.                 &lt;transition event=&#39;quit_clicked&#39; port=&#39;ui&#39; target=&#39;../off&#39;/&gt;
    465. 

  465.             &lt;/state&gt;
    466. 

  466.             &lt;state id=&quot;off&quot;&gt;
    467. 

  467.                 &lt;onentry&gt;
    468. 

  468.                     &lt;script&gt;
    469. 

  469.                         &lt;![CDATA[
    470. 

  470.                         self.clear();
    471. 

  471.                         ]]&gt;
    472. 

  472.                     &lt;/script&gt;
    473. 

  473.                 &lt;/onentry&gt;
    474. 

  474.             &lt;/state&gt;
    475. 

  475.         &lt;/scxml&gt;
    476. 

  476.     &lt;/class&gt;
    477. 

  477. &lt;/diagram&gt;
    478. 

  478. </pre></div>
    479. 

  479. </div>
    480. 

  480. <p>To compile, save this in a file called <code class="docutils literal"><span class="pre">trafficlight.xml</span></code> and run <code class="docutils literal"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">sccd.compiler.sccdc</span> <span class="pre">-p</span> <span class="pre">eventloop</span> <span class="pre">-l</span> <span class="pre">python</span> <span class="pre">trafficlight.xml</span></code></p>
    481. 

  481. <p>Then, the following file will run the model:</p>
    482. 

  482. <div class="highlight-default"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">Tkinter</span> <span class="k">as</span> <span class="nn">tk</span>
    483. 

  483. <span class="kn">import</span> <span class="nn">trafficlight</span>
    484. 

  484. <span class="kn">from</span> <span class="nn">sccd.runtime.libs.ui</span> <span class="k">import</span> <span class="n">ui</span>
    485. 

  485. <span class="kn">from</span> <span class="nn">sccd.runtime.statecharts_core</span> <span class="k">import</span> <span class="n">Event</span>
    486. 

  486. <span class="kn">from</span> <span class="nn">sccd.runtime.tkinter_eventloop</span> <span class="k">import</span> <span class="o">*</span>
    487. 

  487. 

  488. <span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span>
    489. 

  489.     <span class="n">ui</span><span class="o">.</span><span class="n">window</span> <span class="o">=</span> <span class="n">tk</span><span class="o">.</span><span class="n">Tk</span><span class="p">()</span>
    490. 

  490. 

  491.     <span class="n">controller</span> <span class="o">=</span> <span class="n">trafficlight</span><span class="o">.</span><span class="n">Controller</span><span class="p">(</span><span class="n">TkEventLoop</span><span class="p">(</span><span class="n">ui</span><span class="o">.</span><span class="n">window</span><span class="p">))</span>
    492. 

  492.     <span class="n">controller</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
    493. 

  493.     <span class="n">ui</span><span class="o">.</span><span class="n">window</span><span class="o">.</span><span class="n">mainloop</span><span class="p">()</span>
    494. 

  494. </pre></div>
    495. 

  495. </div>
    496. 

  496. </div>
    497. 

  497. <div class="section" id="javascript">
    498. 

  498. <h3>Javascript<a class="headerlink" href="#javascript" title="Permalink to this headline">¶</a></h3>
    499. 

  499. <p>The SCCD model:</p>
    500. 

  500. <div class="highlight-default"><div class="highlight"><pre>&lt;?xml version=&quot;1.0&quot; ?&gt;
    501. 

  501. &lt;diagram author=&quot;Raphael Mannadiar&quot; name=&quot;Traffic_Light_JavaScript_Version&quot;&gt;
    502. 

  502.     &lt;inport name=&quot;ui&quot; /&gt;
    503. 

  503. 

  504.     &lt;class name=&quot;MainApp&quot; default=&quot;true&quot;&gt;
    505. 

  505.         &lt;relationships&gt;
    506. 

  506.             &lt;association name=&quot;trafficlight&quot; class=&quot;TrafficLight&quot; /&gt;
    507. 

  507.         &lt;/relationships&gt;
    508. 

  508.         &lt;method name=&quot;MainApp&quot;&gt;
    509. 

  509.             &lt;body&gt;
    510. 

  510.                 &lt;![CDATA[
    511. 

  511.                 this.canvas = ui.append_canvas(ui.window,100,310,{&#39;background&#39;:&#39;#eee&#39;});
    512. 

  512.                 var police_button = ui.append_button(ui.window, &#39;Police interrupt&#39;);
    513. 

  513.                 var quit_button     = ui.append_button(ui.window, &#39;Quit&#39;);
    514. 

  514.                 ui.bind_event(police_button.element, ui.EVENTS.MOUSE_CLICK, this.controller, &#39;police_interrupt_clicked&#39;);
    515. 

  515.                 ui.bind_event(quit_button.element,   ui.EVENTS.MOUSE_CLICK, this.controller, &#39;quit_clicked&#39;);
    516. 

  516.                 ]]&gt;
    517. 

  517.             &lt;/body&gt;
    518. 

  518.         &lt;/method&gt;
    519. 

  519.         &lt;scxml initial=&quot;initializing&quot;&gt;
    520. 

  520.             &lt;state id=&quot;initializing&quot;&gt;
    521. 

  521.                 &lt;transition target=&quot;../creating&quot;&gt;
    522. 

  522.                     &lt;raise scope=&quot;cd&quot; event=&quot;create_instance&quot;&gt;
    523. 

  523.                         &lt;parameter expr=&#39;&quot;trafficlight&quot;&#39; /&gt;
    524. 

  524.                         &lt;parameter expr=&#39;&quot;TrafficLight&quot;&#39; /&gt;
    525. 

  525.                         &lt;parameter expr=&quot;this.canvas&quot; /&gt;
    526. 

  526.                     &lt;/raise&gt;
    527. 

  527.                 &lt;/transition&gt;
    528. 

  528.             &lt;/state&gt;
    529. 

  529.             &lt;state id=&quot;creating&quot;&gt;
    530. 

  530.                 &lt;transition event=&quot;instance_created&quot; target=&quot;../initialized&quot;&gt;
    531. 

  531.                     &lt;parameter name=&quot;association_name&quot; type=&quot;string&quot;/&gt;
    532. 

  532.                     &lt;raise scope=&quot;cd&quot; event=&quot;start_instance&quot;&gt;
    533. 

  533.                         &lt;parameter expr=&quot;association_name&quot; /&gt;
    534. 

  534.                     &lt;/raise&gt;
    535. 

  535.                     &lt;raise scope=&quot;narrow&quot; event=&quot;set_association_name&quot; target=&quot;association_name&quot;&gt;
    536. 

  536.                         &lt;parameter expr=&quot;association_name&quot; /&gt;
    537. 

  537.                     &lt;/raise&gt;
    538. 

  538.                 &lt;/transition&gt;
    539. 

  539.             &lt;/state&gt;
    540. 

  540.             &lt;state id=&quot;initialized&quot;&gt;
    541. 

  541.             &lt;/state&gt;
    542. 

  542.         &lt;/scxml&gt;
    543. 

  543.     &lt;/class&gt;
    544. 

  544. 

  545.     &lt;class name=&quot;TrafficLight&quot;&gt;
    546. 

  546.         &lt;relationships&gt;
    547. 

  547.         &lt;/relationships&gt;
    548. 

  548.         &lt;method name=&quot;TrafficLight&quot;&gt;
    549. 

  549.             &lt;parameter name=&quot;canvas&quot; /&gt;
    550. 

  550.             &lt;body&gt;
    551. 

  551.                 &lt;![CDATA[
    552. 

  552.                 var size    = 100;
    553. 

  553.                 var offset  = size+5;
    554. 

  554.                 this.RED    = 0;
    555. 

  555.                 this.YELLOW = 1;
    556. 

  556.                 this.GREEN  = 2;
    557. 

  557.                 this.colors = [&#39;#f00&#39;,&#39;#ff0&#39;,&#39;#0f0&#39;]
    558. 

  558.                 this.lights = [canvas.add_rectangle(size/2, size/2,                          size, size, {&#39;fill&#39;:&#39;#000&#39;}),
    559. 

  559.                                     canvas.add_rectangle(size/2, size/2+offset,      size, size, {&#39;fill&#39;:&#39;#000&#39;}),
    560. 

  560.                                     canvas.add_rectangle(size/2, size/2+2*offset, size, size, {&#39;fill&#39;:&#39;#000&#39;})];
    561. 

  561.                 ]]&gt;
    562. 

  562.             &lt;/body&gt;
    563. 

  563.         &lt;/method&gt;
    564. 

  564.         &lt;method name=&quot;clear&quot;&gt;
    565. 

  565.             &lt;body&gt;
    566. 

  566.                 &lt;![CDATA[
    567. 

  567.                 this.lights[this.RED].set_color(&#39;#000&#39;);
    568. 

  568.                 this.lights[this.YELLOW].set_color(&#39;#000&#39;);
    569. 

  569.                 this.lights[this.GREEN].set_color(&#39;#000&#39;);
    570. 

  570.                 ]]&gt;
    571. 

  571.             &lt;/body&gt;
    572. 

  572.         &lt;/method&gt;
    573. 

  573.         &lt;method name=&quot;setGreen&quot;&gt;
    574. 

  574.             &lt;body&gt;
    575. 

  575.                 &lt;![CDATA[
    576. 

  576.                 this.clear();
    577. 

  577.                 this.lights[this.GREEN].set_color(this.colors[this.GREEN]);
    578. 

  578.                 ]]&gt;
    579. 

  579.             &lt;/body&gt;
    580. 

  580.         &lt;/method&gt;
    581. 

  581.         &lt;method name=&quot;setYellow&quot;&gt;
    582. 

  582.             &lt;body&gt;
    583. 

  583.                 &lt;![CDATA[
    584. 

  584.                 this.clear();
    585. 

  585.                 this.lights[this.YELLOW].set_color(this.colors[this.YELLOW]);
    586. 

  586.                 ]]&gt;
    587. 

  587.             &lt;/body&gt;
    588. 

  588.         &lt;/method&gt;
    589. 

  589.         &lt;method name=&quot;setRed&quot;&gt;
    590. 

  590.             &lt;body&gt;
    591. 

  591.                 &lt;![CDATA[
    592. 

  592.                 this.clear();
    593. 

  593.                 this.lights[this.RED].set_color(this.colors[this.RED]);
    594. 

  594.                 ]]&gt;
    595. 

  595.             &lt;/body&gt;
    596. 

  596.         &lt;/method&gt;
    597. 

  597.         &lt;scxml initial=&quot;on&quot;&gt;
    598. 

  598.             &lt;state id=&quot;on&quot; initial=&quot;normal&quot;&gt;
    599. 

  599.                 &lt;state id=&quot;normal&quot; initial=&quot;red&quot;&gt;
    600. 

  600.                     &lt;state id=&quot;red&quot;&gt;
    601. 

  601.                         &lt;onentry&gt;
    602. 

  602.                             &lt;script&gt;
    603. 

  603.                                 &lt;![CDATA[
    604. 

  604.                                 this.setRed();
    605. 

  605.                                 ]]&gt;
    606. 

  606.                             &lt;/script&gt;
    607. 

  607.                         &lt;/onentry&gt;
    608. 

  608.                         &lt;transition after=&#39;3&#39; target=&#39;../green&#39;/&gt;
    609. 

  609.                     &lt;/state&gt;
    610. 

  610.                     &lt;state id=&quot;green&quot;&gt;
    611. 

  611.                         &lt;onentry&gt;
    612. 

  612.                             &lt;script&gt;
    613. 

  613.                                 &lt;![CDATA[
    614. 

  614.                                 this.setGreen();
    615. 

  615.                                 ]]&gt;
    616. 

  616.                             &lt;/script&gt;
    617. 

  617.                         &lt;/onentry&gt;
    618. 

  618.                         &lt;transition after=&#39;2&#39; target=&#39;../yellow&#39;/&gt;
    619. 

  619.                     &lt;/state&gt;
    620. 

  620.                     &lt;state id=&quot;yellow&quot;&gt;
    621. 

  621.                         &lt;onentry&gt;
    622. 

  622.                             &lt;script&gt;
    623. 

  623.                                 &lt;![CDATA[
    624. 

  624.                                 this.setYellow();
    625. 

  625.                                 ]]&gt;
    626. 

  626.                             &lt;/script&gt;
    627. 

  627.                         &lt;/onentry&gt;
    628. 

  628.                     &lt;transition after=&#39;1&#39; target=&#39;../red&#39;/&gt;
    629. 

  629.                     &lt;/state&gt;
    630. 

  630.                     &lt;transition event=&#39;police_interrupt_clicked&#39; port=&#39;ui&#39; target=&#39;../interrupted&#39;/&gt;
    631. 

  631.                     &lt;history id=&quot;history&quot;/&gt;
    632. 

  632.                 &lt;/state&gt;
    633. 

  633.                 &lt;state id=&quot;interrupted&quot; initial=&quot;yellow&quot;&gt;
    634. 

  634.                     &lt;state id=&quot;yellow&quot;&gt;
    635. 

  635.                         &lt;onentry&gt;
    636. 

  636.                             &lt;script&gt;
    637. 

  637.                                 &lt;![CDATA[
    638. 

  638.                                 this.setYellow();
    639. 

  639.                                 ]]&gt;
    640. 

  640.                             &lt;/script&gt;
    641. 

  641.                         &lt;/onentry&gt;
    642. 

  642.                         &lt;transition after=&#39;.5&#39; target=&#39;../black&#39;/&gt;
    643. 

  643.                     &lt;/state&gt;
    644. 

  644.                     &lt;state id=&quot;black&quot;&gt;
    645. 

  645.                         &lt;onentry&gt;
    646. 

  646.                             &lt;script&gt;
    647. 

  647.                                 &lt;![CDATA[
    648. 

  648.                                 this.clear();
    649. 

  649.                                 ]]&gt;
    650. 

  650.                             &lt;/script&gt;
    651. 

  651.                         &lt;/onentry&gt;
    652. 

  652.                         &lt;transition after=&#39;.5&#39; target=&#39;../yellow&#39;/&gt;
    653. 

  653.                     &lt;/state&gt;
    654. 

  654.                     &lt;transition event=&#39;police_interrupt_clicked&#39; port=&#39;ui&#39; target=&#39;../normal/history&#39;/&gt;
    655. 

  655.                 &lt;/state&gt;
    656. 

  656.                 &lt;transition event=&#39;quit_clicked&#39; port=&#39;ui&#39; target=&#39;../off&#39;/&gt;
    657. 

  657.             &lt;/state&gt;
    658. 

  658.             &lt;state id=&quot;off&quot;&gt;
    659. 

  659.                 &lt;onentry&gt;
    660. 

  660.                     &lt;script&gt;
    661. 

  661.                         &lt;![CDATA[
    662. 

  662.                         this.clear();
    663. 

  663.                         ]]&gt;
    664. 

  664.                     &lt;/script&gt;
    665. 

  665.                 &lt;/onentry&gt;
    666. 

  666.             &lt;/state&gt;
    667. 

  667.         &lt;/scxml&gt;
    668. 

  668.     &lt;/class&gt;
    669. 

  669. &lt;/diagram&gt;
    670. 

  670. </pre></div>
    671. 

  671. </div>
    672. 

  672. <p>To compile, save this in a file called <code class="docutils literal"><span class="pre">trafficlight.xml</span></code> and run <code class="docutils literal"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">sccd.compiler.sccdc</span> <span class="pre">-p</span> <span class="pre">eventloop</span> <span class="pre">-l</span> <span class="pre">javascript</span> <span class="pre">trafficlight.xml</span></code></p>
    673. 

  673. <p>Then, the following file will run the model:</p>
    674. 

  674. <div class="highlight-default"><div class="highlight"><pre><span class="o">&lt;</span><span class="n">div</span><span class="o">&gt;</span>
    675. 

  675.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/HackTimer.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    676. 

  676.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/statecharts_core.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    677. 

  677.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/utils.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    678. 

  678.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/svg.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    679. 

  679.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;https://msdl.uantwerpen.be/git/simon/SCCD/raw/v0.9/src/javascript_sccd_runtime/libs/ui.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    680. 

  680.     <span class="o">&lt;</span><span class="n">script</span> <span class="n">src</span><span class="o">=</span><span class="s">&quot;trafficlight.js&quot;</span><span class="o">&gt;&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    681. 

  681.     <span class="o">&lt;</span><span class="n">script</span><span class="o">&gt;</span>
    682. 

  682.     <span class="n">controller</span> <span class="o">=</span> <span class="n">new</span> <span class="n">Traffic_Light_JavaScript_Version</span><span class="o">.</span><span class="n">Controller</span><span class="p">(</span><span class="n">new</span> <span class="n">JsEventLoop</span><span class="p">());</span>
    683. 

  683.     <span class="n">controller</span><span class="o">.</span><span class="n">start</span><span class="p">();</span>
    684. 

  684.     <span class="o">&lt;/</span><span class="n">script</span><span class="o">&gt;</span>
    685. 

  685. <span class="o">&lt;/</span><span class="n">div</span><span class="o">&gt;</span>
    686. 

  686. </pre></div>
    687. 

  687. </div>
    688. 

  688. </div>
    689. 

  689. </div>
    690. 

  690. </div>
    691. 

  691. 

  692. 

  693.           </div>
    694. 

  694.         </div>
    695. 

  695.       </div>
    696. 

  696.       <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
    697. 

  697.         <div class="sphinxsidebarwrapper">
    698. 

  698.   <h3><a href="index.html">Table Of Contents</a></h3>
    699. 

  699.   <ul>
    700. 

  700. <li><a class="reference internal" href="#">Examples</a><ul>
    701. 

  701. <li><a class="reference internal" href="#timer">Timer</a><ul>
    702. 

  702. <li><a class="reference internal" href="#threads-python">Threads (Python)</a></li>
    703. 

  703. <li><a class="reference internal" href="#eventloop-python">Eventloop (Python)</a></li>
    704. 

  704. <li><a class="reference internal" href="#eventloop-javascript">Eventloop (Javascript)</a></li>
    705. 

  705. </ul>
    706. 

  706. </li>
    707. 

  707. <li><a class="reference internal" href="#traffic-lights">Traffic Lights</a><ul>
    708. 

  708. <li><a class="reference internal" href="#python">Python</a></li>
    709. 

  709. <li><a class="reference internal" href="#javascript">Javascript</a></li>
    710. 

  710. </ul>
    711. 

  711. </li>
    712. 

  712. </ul>
    713. 

  713. </li>
    714. 

  714. </ul>
    715. 

  715. 

  716.   <h4>Previous topic</h4>
    717. 

  717.   <p class="topless"><a href="runtime_platforms.html"
    718. 

  718.                         title="previous chapter">Runtime Platforms</a></p>
    719. 

  719.   <h4>Next topic</h4>
    720. 

  720.   <p class="topless"><a href="semantic_options.html"
    721. 

  721.                         title="next chapter">Semantic Options</a></p>
    722. 

  722.   <div role="note" aria-label="source link">
    723. 

  723.     <h3>This Page</h3>
    724. 

  724.     <ul class="this-page-menu">
    725. 

  725.       <li><a href="_sources/examples.txt"
    726. 

  726.             rel="nofollow">Show Source</a></li>
    727. 

  727.     </ul>
    728. 

  728.    </div>
    729. 

  729. <div id="searchbox" style="display: none" role="search">
    730. 

  730.   <h3>Quick search</h3>
    731. 

  731.     <form class="search" action="search.html" method="get">
    732. 

  732.       <div><input type="text" name="q" /></div>
    733. 

  733.       <div><input type="submit" value="Go" /></div>
    734. 

  734.       <input type="hidden" name="check_keywords" value="yes" />
    735. 

  735.       <input type="hidden" name="area" value="default" />
    736. 

  736.     </form>
    737. 

  737. </div>
    738. 

  738. <script type="text/javascript">$('#searchbox').show(0);</script>
    739. 

  739.         </div>
    740. 

  740.       </div>
    741. 

  741.       <div class="clearer"></div>
    742. 

  742.     </div>
    743. 

  743.     <div class="related" role="navigation" aria-label="related navigation">
    744. 

  744.       <h3>Navigation</h3>
    745. 

  745.       <ul>
    746. 

  746.         <li class="right" style="margin-right: 10px">
    747. 

  747.           <a href="genindex.html" title="General Index"
    748. 

  748.              >index</a></li>
    749. 

  749.         <li class="right" >
    750. 

  750.           <a href="py-modindex.html" title="Python Module Index"
    751. 

  751.              >modules</a> |</li>
    752. 

  752.         <li class="right" >
    753. 

  753.           <a href="semantic_options.html" title="Semantic Options"
    754. 

  754.              >next</a> |</li>
    755. 

  755.         <li class="right" >
    756. 

  756.           <a href="runtime_platforms.html" title="Runtime Platforms"
    757. 

  757.              >previous</a> |</li>
    758. 

  758.         <li class="nav-item nav-item-0"><a href="index.html">SCCD 0.9 documentation</a> &#187;</li> 
    759. 

  759.       </ul>
    760. 

  760.     </div>
    761. 

  761.     <div class="footer" role="contentinfo">
    762. 

  762.         &#169; Copyright 2016, Simon Van Mierlo.
    763. 

  763.       Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.4.6.
    764. 

  764.     </div>
    765. 

  765.   </body>
    766. 

  766. </html>
    767.