scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Canvas 003</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-003">Demo Canvas 003</h1> <p>Linear gradients</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-003.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, makeBlock, makeGradient, makeRender, observeAndUpdate, } <span class="hljs-keyword">from</span> <span class="hljs-string">'../source/scrawl.js'</span> <span class="hljs-keyword">import</span> { reportSpeed, killStyle } <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 = L.<span class="hljs-property">artefact</span>.<span class="hljs-property">mycanvas</span>;</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>Create the linear gradient - we will kill and resurrect it as the demo runs</p> <ul> <li>Needs to be a let, not a const, because we’re going to kill/resurrect this gradient</li> </ul> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> graddy = <span class="hljs-title function_">makeGradient</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'mygradient'</span>, <span class="hljs-attr">endX</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">easing</span>: <span class="hljs-string">'linear'</span>, <span class="hljs-attr">precision</span>: <span class="hljs-number">1</span>, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>Test the ability to load a user-created easing algorithm into the gradient</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> bespokeEasings = { <span class="hljs-string">'user-steps'</span>: <span class="hljs-function">(<span class="hljs-params">val</span>) =></span> { <span class="hljs-keyword">if</span> (val < <span class="hljs-number">0.2</span>) <span class="hljs-keyword">return</span> <span class="hljs-number">0.1</span>; <span class="hljs-keyword">if</span> (val < <span class="hljs-number">0.4</span>) <span class="hljs-keyword">return</span> <span class="hljs-number">0.3</span>; <span class="hljs-keyword">if</span> (val < <span class="hljs-number">0.6</span>) <span class="hljs-keyword">return</span> <span class="hljs-number">0.5</span>; <span class="hljs-keyword">if</span> (val < <span class="hljs-number">0.8</span>) <span class="hljs-keyword">return</span> <span class="hljs-number">0.7</span>; <span class="hljs-keyword">return</span> <span class="hljs-number">0.9</span>; }, <span class="hljs-string">'user-repeat'</span>: <span class="hljs-function">(<span class="hljs-params">val</span>) =></span> (val * <span class="hljs-number">4</span>) % <span class="hljs-number">1</span>, };</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Create a block entity which will use the gradient</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'myblock'</span>, <span class="hljs-attr">width</span>: <span class="hljs-string">'90%'</span>, <span class="hljs-attr">height</span>: <span class="hljs-string">'90%'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'5%'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-string">'5%'</span>, <span class="hljs-attr">fillStyle</span>: graddy, <span class="hljs-attr">lockFillStyleToEntity</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'coral'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillAndDraw'</span>, });</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</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>) {</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>if (L.palette.mygradient_palette) console.log(L.palette.mygradient_palette.colors); @ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> <span class="hljs-string">` Palette - start: <span class="hljs-subst">${paletteStart.value}</span>; end: <span class="hljs-subst">${paletteEnd.value}</span>\n Start - x: <span class="hljs-subst">${startX.value}</span>%; y: <span class="hljs-subst">${startY.value}</span>%\n End - x: <span class="hljs-subst">${endX.value}</span>%; y: <span class="hljs-subst">${endY.value}</span>%\n Precision: <span class="hljs-subst">${precision.value}</span>`</span>; });</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</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>: canvas, <span class="hljs-attr">afterShow</span>: report, });</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <h4 id="user-interaction">User interaction</h4> <p>Setup form observer functionality. We’re doing it this way (wrapped in a function) so we can test that it can be killed, and then recreated, later</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> <span class="hljs-title function_">makeObserver</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> <span class="hljs-title function_">observeAndUpdate</span>({ <span class="hljs-attr">event</span>: [<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>], <span class="hljs-attr">origin</span>: <span class="hljs-string">'.controlItem'</span>, <span class="hljs-attr">target</span>: graddy, <span class="hljs-attr">useNativeListener</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">preventDefault</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">updates</span>: { <span class="hljs-attr">paletteStart</span>: [<span class="hljs-string">'paletteStart'</span>, <span class="hljs-string">'int'</span>], <span class="hljs-attr">paletteEnd</span>: [<span class="hljs-string">'paletteEnd'</span>, <span class="hljs-string">'int'</span>], <span class="hljs-attr">startX</span>: [<span class="hljs-string">'startX'</span>, <span class="hljs-string">'%'</span>], <span class="hljs-attr">startY</span>: [<span class="hljs-string">'startY'</span>, <span class="hljs-string">'%'</span>], <span class="hljs-attr">endX</span>: [<span class="hljs-string">'endX'</span>, <span class="hljs-string">'%'</span>], <span class="hljs-attr">endY</span>: [<span class="hljs-string">'endY'</span>, <span class="hljs-string">'%'</span>], <span class="hljs-attr">precision</span>: [<span class="hljs-string">'precision'</span>, <span class="hljs-string">'int'</span>], <span class="hljs-attr">cyclePalette</span>: [<span class="hljs-string">'cyclePalette'</span>, <span class="hljs-string">'boolean'</span>], <span class="hljs-attr">colorSpace</span>: [<span class="hljs-string">'colorSpace'</span>, <span class="hljs-string">'raw'</span>], <span class="hljs-attr">returnColorAs</span>: [<span class="hljs-string">'returnColorAs'</span>, <span class="hljs-string">'raw'</span>], }, }); }</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>… Create the form observer</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> myobserver = <span class="hljs-title function_">makeObserver</span>();</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Adding and removing color stops to the gradient - we’re using <strong>updateColor</strong> and <strong>removeColor</strong> functions rather than setting them on the gradient, so need separate event listener(s) to action form changes.</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">events</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_">addNativeListener</span>([<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>], <span class="hljs-function">(<span class="hljs-params">e</span>) =></span> { <span class="hljs-title function_">events</span>(e); <span class="hljs-keyword">let</span> val = <span class="hljs-built_in">parseInt</span>(e.<span class="hljs-property">target</span>.<span class="hljs-property">value</span>, <span class="hljs-number">10</span>); <span class="hljs-keyword">switch</span> (e.<span class="hljs-property">target</span>.<span class="hljs-property">id</span>) { <span class="hljs-keyword">case</span> <span class="hljs-string">'red'</span> : <span class="hljs-keyword">if</span> (val) graddy.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">350</span>, <span class="hljs-string">'red'</span>); <span class="hljs-keyword">else</span> graddy.<span class="hljs-title function_">removeColor</span>(<span class="hljs-number">350</span>); <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> <span class="hljs-string">'blue'</span> : <span class="hljs-keyword">if</span> (val) graddy.<span class="hljs-title function_">updateColor</span>(<span class="hljs-number">650</span>, <span class="hljs-string">'blue'</span>); <span class="hljs-keyword">else</span> graddy.<span class="hljs-title function_">removeColor</span>(<span class="hljs-number">650</span>); <span class="hljs-keyword">break</span>; } }, <span class="hljs-string">'.colorItems'</span>); <span class="hljs-title function_">addNativeListener</span>([<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>], <span class="hljs-function">(<span class="hljs-params">e</span>) =></span> { <span class="hljs-title function_">events</span>(e); <span class="hljs-keyword">let</span> val = e.<span class="hljs-property">target</span>.<span class="hljs-property">value</span>; <span class="hljs-keyword">if</span> ([<span class="hljs-string">'user-steps'</span>, <span class="hljs-string">'user-repeat'</span>].<span class="hljs-title function_">includes</span>(val)) { graddy.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">easing</span>: bespokeEasings[val], }); } <span class="hljs-keyword">else</span> { graddy.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">easing</span>: val, }); } }, <span class="hljs-string">'#easing'</span>);</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>Set the DOM input values</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> paletteStart = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#paletteStart'</span>); <span class="hljs-keyword">const</span> paletteEnd = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#paletteEnd'</span>); <span class="hljs-keyword">const</span> startX = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#startX'</span>); <span class="hljs-keyword">const</span> startY = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#startY'</span>); <span class="hljs-keyword">const</span> endX = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#endX'</span>); <span class="hljs-keyword">const</span> endY = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#endY'</span>); <span class="hljs-keyword">const</span> precision = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#precision'</span>);</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre>paletteStart.<span class="hljs-property">value</span> = <span class="hljs-number">0</span>;</pre></div></div> </li> <li id="section-15"> <