scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Canvas 026</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"> <link rel="stylesheet" media="all" href="../docco.css" /> </head> <body> <div id="container"> <div id="background"></div> <ul id="jump_to"> <li> <a class="large" href="javascript:void(0);">Jump To …</a> <a class="small" href="javascript:void(0);">+</a> <div id="jump_wrapper"> <div id="jump_page_wrapper"> <div id="jump_page"> <a class="source" href="canvas-001.html"> ./demo/canvas-001.js </a> <a class="source" href="canvas-002.html"> ./demo/canvas-002.js </a> <a class="source" href="canvas-003.html"> ./demo/canvas-003.js </a> <a class="source" href="canvas-004.html"> ./demo/canvas-004.js </a> <a class="source" href="canvas-005.html"> ./demo/canvas-005.js </a> <a class="source" href="canvas-006.html"> ./demo/canvas-006.js </a> <a 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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-canvas-026">Demo Canvas 026</h1> <p>Tower of Hanoi</p> </div> </li> <li id="section-2"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-2">§</a> </div> <p><a href="../../demo/canvas-026.html">Run code</a></p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> * <span class="hljs-keyword">as</span> scrawl <span class="hljs-keyword">from</span> <span class="hljs-string">'../source/scrawl.js'</span> <span class="hljs-keyword">import</span> { reportSpeed } <span class="hljs-keyword">from</span> <span class="hljs-string">'./utilities.js'</span>;</pre></div></div> </li> <li id="section-3"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-3">§</a> </div> <h4 id="scene-setup">Scene setup</h4> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> canvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>.<span class="hljs-property">mycanvas</span>; scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'peg-1'</span>, <span class="hljs-attr">width</span>: <span class="hljs-string">'30%'</span>, <span class="hljs-attr">height</span>: <span class="hljs-string">'90%'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'17%'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">handleX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">handleY</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'rgb(220, 220, 220)'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">5</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'drawThenFill'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'peg-2'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'blue'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'peg-3'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'83%'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'orange'</span>, }); scrawl.<span class="hljs-title function_">makeWheel</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'disc-1'</span>, <span class="hljs-attr">order</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">radius</span>: <span class="hljs-string">'12%'</span>, <span class="hljs-attr">handleX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">handleY</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">pivot</span>: <span class="hljs-string">'peg-1'</span>, <span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'pink'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">6</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'drawAndFill'</span>, <span class="hljs-attr">shadowColor</span>: <span class="hljs-string">'black'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'disc-2'</span>, <span class="hljs-attr">order</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">radius</span>: <span class="hljs-string">'10%'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'lightblue'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'blue'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'disc-3'</span>, <span class="hljs-attr">order</span>: <span class="hljs-number">3</span>, <span class="hljs-attr">radius</span>: <span class="hljs-string">'8%'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'orange'</span>, }); <span class="hljs-keyword">let</span> discGroup = scrawl.<span class="hljs-title function_">makeGroup</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'discs'</span>, }); <span class="hljs-keyword">let</span> dragActions = scrawl.<span class="hljs-title function_">makeDragZone</span>({ <span class="hljs-attr">zone</span>: canvas, <span class="hljs-attr">collisionGroup</span>: <span class="hljs-string">'discs'</span>, <span class="hljs-attr">endOn</span>: [<span class="hljs-string">'up'</span>, <span class="hljs-string">'leave'</span>], <span class="hljs-attr">exposeCurrentArtefact</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">resetCoordsToZeroOnTouchEnd</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">updateOnStart</span>: { <span class="hljs-attr">shadowBlur</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">shadowOffsetX</span>: <span class="hljs-number">3</span>, <span class="hljs-attr">shadowOffsetY</span>: <span class="hljs-number">3</span>, }, <span class="hljs-attr">updateOnEnd</span>: { <span class="hljs-attr">shadowBlur</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">shadowOffsetX</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">shadowOffsetY</span>: <span class="hljs-number">0</span>, }, }); <span class="hljs-keyword">let</span> checkPeg = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">let</span> peg, disc; <span class="hljs-keyword">let</span> pegGroup = scrawl.<span class="hljs-title function_">makeGroup</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'pegs'</span>, }).<span class="hljs-title function_">addArtefacts</span>(<span class="hljs-string">'peg-1'</span>, <span class="hljs-string">'peg-2'</span>, <span class="hljs-string">'peg-3'</span>);</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>Setup the game’s initial state</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> pegState = { <span class="hljs-string">'peg-1'</span>: [<span class="hljs-string">'disc-1'</span>, <span class="hljs-string">'disc-2'</span>, <span class="hljs-string">'disc-3'</span>], <span class="hljs-string">'peg-2'</span>: [], <span class="hljs-string">'peg-3'</span>: [], };</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>Function to update the game’s state</p> <ul> <li>mydisc will always be the last member of an array, </li> <li>so we can pop it when found, then push it onto mypeg</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> updateState = <span class="hljs-keyword">function</span> (<span class="hljs-params">mypeg, mydisc</span>) { <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> [pName, pState] <span class="hljs-keyword">of</span> <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">entries</span>(pegState)) { <span class="hljs-keyword">if</span> (pState.<span class="hljs-title function_">includes</span>(mydisc.<span class="hljs-property">name</span>)) pState.<span class="hljs-title function_">pop</span>(); } pegState[mypeg.<span class="hljs-property">name</span>].<span class="hljs-title function_">push</span>(mydisc.<span class="hljs-property">name</span>); }</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Function to update the disc group’s membership</p> <ul> <li>a disc can only be moved if it is a member of this group</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> updateDiscGroup = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { discGroup.<span class="hljs-title function_">clearArtefacts</span>(); <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> [pName, pState] <span class="hljs-keyword">of</span> <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">entries</span>(pegState)) { <span class="hljs-keyword">if</span> (pState.<span class="hljs-property">length</span>) discGroup.<span class="hljs-title function_">addArtefacts</span>(pState[pState.<span class="hljs-property">length</span> - <span class="hljs-number">1</span>]); }</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Because this Group is outside the Display cycle</p> <ul> <li>(we haven’t assigned it to a Cell object)</li> <li>we need to manually invoke its sort routine</li> </ul> </div> <div class="content"><div class='highlight'><pre> discGroup.<span class="hljs-title function_">sortArtefacts</span>(); } <span class="hljs-title function_">updateDiscGroup</span>();</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>Enforce the game rules</p> <ul> <li>a disc can only move to a peg if no smaller discs are already on that peg</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> entity = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">entity</span>; <span class="hljs-keyword">let</span> checkForLegalMove = <span class="hljs-keyword">function</span> (<span class="hljs-params">mypeg, mydisc</span>) { <span class="hljs-keyword">if</span> (!pegState[mypeg.<span class="hljs-property">name</span>].<span class="hljs-property">length</span>) <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>; <span class="hljs-keyword">return</span> pegState[mypeg.<span class="hljs-property">name</span>].<span class="hljs-title function_">every</span>(<span class="hljs-function"><span class="hljs-params">d</span> =></span> entity[d].<span class="hljs-title function_">get</span>(<span class="hljs-string">'order'</span>) < mydisc.<span class="hljs-title function_">get</span>(<span class="hljs-string">'order'</span>)); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">let</span> hit = pegGroup.<span class="hljs-title function_">getArtefactAt</span>(canvas.<span class="hljs-property">here</span>); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> hit !== <span class="hljs-string">'boolean'</span> && hit) peg = hit.<span class="hljs-property">artefact</span>; <span class="hljs-keyword">else</span> peg = <span class="hljs-literal">false</span>; <span class="hljs-keyword">let</span> checkDrag = <span class="hljs-title function_">dragActions</span>(); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> checkDrag !== <span class="hljs-string">'boolean'</span> && checkDrag) disc = checkDrag.<span class="hljs-property">artefact</span>; <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (disc) { <span class="hljs-keyword">if</span> (peg) { <span class="hljs-keyword">if</span> (<span class="hljs-title function_">checkForLegalMove</span>(peg, disc)) { <span class="hljs-title function_">updateState</span>(peg, disc); <span class="hljs-title function_">updateDiscGroup</span>(); disc.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">pivot</span>: peg, }); } } disc = <span class="hljs-literal">false</span>; } } }();</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <h4 id="scene-animation">Scene animation</h4> <p>Function to display frames-per-second data, and other information relevant to the demo</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> report = <span class="hljs-title function_">reportSpeed</span>(<span class="hljs-string">'#reportmessage'</span>);</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>Create the Animation loop which will run the Display cycle</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeRender</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${canvas.name}</span>-render`</span>, <span class="hljs-attr">target</span>: canvas, <span class="hljs-attr">commence</span>: checkPeg, <span class="hljs-attr">afterShow</span>: report, });</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <h4 id="development-and-testing">Development and testing</h4> </div> <div class="content"><div class='highlight'><pre><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(scrawl.<span class="hljs-property">library</span>);</pre></div></div> </li> </ul> </div> </body> </html>