scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Canvas 006</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-006">Demo Canvas 006</h1> <p>Canvas tween stress test</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-006.html">Run code</a></p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { addNativeListener, library <span class="hljs-keyword">as</span> L, makeRender, makeTween, makeWheel, releaseVector, requestVector, } <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> porthole = L.<span class="hljs-property">artefact</span>.<span class="hljs-property">porthole</span>; porthole.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">css</span>: { <span class="hljs-attr">borderRadius</span>: <span class="hljs-string">'50%'</span> } });</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <h5 id="star-generation-functionality">Star generation functionality</h5> </div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>We use this entity as a template for cloning new stars</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> starling = <span class="hljs-title function_">makeWheel</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'starling'</span>, <span class="hljs-attr">radius</span>: <span class="hljs-number">3</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">method</span>: <span class="hljs-string">'fill'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'white'</span>,</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Adding in some flags to help speed up the Display cycle</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">noDeltaUpdates</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noPositionDependencies</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noFilters</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">noUserInteraction</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">purge</span>: <span class="hljs-string">'all'</span>, }); <span class="hljs-keyword">let</span> starCount = <span class="hljs-number">0</span>, addNumber = <span class="hljs-number">100</span>;</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p><code>makeStar</code> function</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> makeStars = <span class="hljs-keyword">function</span> (<span class="hljs-params">buildNumber</span>) {</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>We use a Vector for calculating the new star’s direction</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> v = <span class="hljs-title function_">requestVector</span>(), star, i, myRandom; <span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < buildNumber; i++) { starCount++;</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>Clone the entity template</p> </div> <div class="content"><div class='highlight'><pre> star = starling.<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">`star_<span class="hljs-subst">${starCount}</span>`</span>,</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>Additional flags for speeding up the Display cycle</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">noCanvasEngineUpdates</span>: <span class="hljs-literal">true</span>,</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>All cloned stars will share the template star’s State object - to save on memory</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">sharedState</span>: <span class="hljs-literal">true</span>, }); myRandom = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>(); v.<span class="hljs-title function_">setXY</span>(<span class="hljs-number">1</span>, <span class="hljs-number">0</span>).<span class="hljs-title function_">rotate</span>(<span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>() * <span class="hljs-number">360</span>).<span class="hljs-title function_">scalarMultiply</span>(<span class="hljs-number">300</span>);</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Every star gets its own Tween object</p> <ul> <li>And each Tween generates its own Ticker timeline object</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-title function_">makeTween</span>({ <span class="hljs-attr">name</span>: star.<span class="hljs-property">name</span>, <span class="hljs-attr">targets</span>: star, <span class="hljs-attr">duration</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((myRandom * <span class="hljs-number">3000</span>) + <span class="hljs-number">2000</span>), <span class="hljs-attr">cycles</span>: <span class="hljs-number">0</span>,</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>We will animate the star’s <code>start</code> Coordinate (using <strong>startX</strong> and <strong>startY</strong> pseudo-attributes)</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">definitions</span>: [{ <span class="hljs-attr">attribute</span>: <span class="hljs-string">'startX'</span>,</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>integer: true,</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">start</span>: <span class="hljs-number">300</span>, <span class="hljs-attr">end</span>: <span class="hljs-number">300</span> + v.<span class="hljs-property">x</span> }, { <span class="hljs-attr">attribute</span>: <span class="hljs-string">'startY'</span>,</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>integer: true,</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">start</span>: <span class="hljs-number">300</span>, <span class="hljs-attr">end</span>: <span class="hljs-number">300</span> + v.<span class="hljs-property">y</span> }, {</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <p>We will also animate the star’s <code>scale</code> value to make the animation look more 3D</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">attribute</span>: <span class="hljs-string">'scale'</span>, <span class="hljs-attr">start</span>: <span class="hljs-number">0.5</span>, <span class="hljs-attr">end</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">round</span>((<span class="hljs-number">1</span> - myRandom) * <span class="hljs-number">0.9</span>) + <span class="hljs-number">0.6</span>, }]</pre></div></div> </li> <li id="section-17"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-17">§</a> </div> <p>We start the Tween running immediately after it has been created.</p> </div> <div class="content"><div class='highlight'><pre> }).<span class="hljs-title function_">run</span>(); }</pre></div></div> </li> <li id="section-18"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-18">§</a> </div> <p>We need to release our Vector back to its vector pool</p> <ul> <li>Failure to release pool objects can lead to memory leaks.</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-title function_">releaseVector</span>(v);</pre></div></div> </li> <li id="section-19"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-19">§</a> </div> <p>Change the color of the stars each time the user clicks on the porthole</p> </div> <div class="content"><div class='highlight'><pre> starling.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">`rgb(<span class="hljs-subst">${<span class="hljs-built_in">Math</span>.floor(<span class="hljs-built_in">Math</span>.random() * <span class="hljs-number">55</span>) + <span class="hljs-number">200</span>}</span>, <span class="hljs-subst">${<span class="hljs-built_in">Math</span>.floor(<span class="hljs-built_in">Math</span>.random() * <span class="hljs-number">55</span>) + <span class="hljs-number">200</span>}</span>, <span class="hljs-subst">${<span class="hljs-built_in">Math</span>.floor(<span class="hljs-built_in">Math</span>.random() * <span class="hljs-number">55</span>) + <span class="hljs-number">200</span>}</span>)`</span> }); };</pre></div></div> </li> <li id="section-20"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-20">§</a> </div> <p>Generate the initial stars</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-title function_">makeStars</span>(<span class="hljs-number">100</span>);</pre></div></div> </li> <li id="section-21"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-21">§</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>, <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">return</span> <span class="hljs-string">`Stars: <span class="hljs-subst">${starCount}</span>`</span>; });</pre></div></div> </li> <li id="section-22"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-22">§</a> </div> <p>Create the Display cycle animation</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-title function_">makeRender</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation'</span>, <span class="hljs-attr">target</span>: porthole, <span class="hljs-attr">afterShow</span>: report, });</pre></div></div> </li> <li id="section-23"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-23">§</a> </div> <h4 id="user-interaction">User interaction</h4> <p>Event listeners</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> <span class="hljs-title function_">addStars</span> = (<span class="hljs-params">e</span>) => { e.<span class="hljs-title function_">preventDefault</span>(); e.<span class="hljs-property">returnValue</span> = <span class="hljs-literal">false</span>; <span class="hljs-title function_">makeStars</span>(addNumber); }; <span class="hljs-title function_">addNativeListener</span>(<span class="hljs-string">'click'</span>, addStars, porthole.<span class="hljs-property">domElement</span>);</pre></div></div> </li> </ul> </div> </body> </html>