scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Filters 501</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> 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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-filters-501">Demo Filters 501</h1> <p>Canvas engine filter strings (based on CSS filters)</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/filters-501.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">const</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_">importDomImage</span>(<span class="hljs-string">'.flowers'</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 target entitys</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> piccy = scrawl.<span class="hljs-title function_">makePicture</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'base-piccy'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'iris'</span>, <span class="hljs-attr">width</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">height</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">copyWidth</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">copyHeight</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fill'</span>, }); <span class="hljs-keyword">const</span> text = scrawl.<span class="hljs-title function_">makePhrase</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-text'</span>, <span class="hljs-attr">text</span>: <span class="hljs-string">'Hello world'</span>, <span class="hljs-attr">font</span>: <span class="hljs-string">'bold 70px sans-serif'</span>, <span class="hljs-attr">start</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>], <span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>], <span class="hljs-attr">lineHeight</span>: <span class="hljs-number">0.5</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'aliceblue'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">3</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</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-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Create the Display cycle animation</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> demoAnimation = scrawl.<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-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <h4 id="user-interaction">User interaction</h4> <p>No additional work required in the Javascript file to create the CSS filters; these are defined as Strings in the HTML select <option> elements, and will be set on the target entitys as part of the form control user interaction below.</p> <pre><code><select <span class="hljs-keyword">class</span>=<span class="hljs-string">"controlItem"</span> id=<span class="hljs-string">"filter"</span>> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"none"</span>></span>none<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"blur(6px)"</span>></span>blur(6px)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"brightness(0.4)"</span>></span>brightness(0.4)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"contrast(200%)"</span>></span>contrast(200%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"drop-shadow(4px 4px 4px blue)"</span>></span>drop-shadow(4px 4px 4px blue)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"grayscale(100%)"</span>></span>grayscale(100%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"hue-rotate(90deg)"</span>></span>hue-rotate(90deg)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"invert(75%)"</span>></span>invert(75%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"opacity(25%)"</span>></span>opacity(25%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"saturate(30%)"</span>></span>saturate(30%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">option</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"sepia(100%)"</span>></span>sepia(100%)<span class="hljs-tag"></<span class="hljs-name">option</span>></span></span> </select> </code></pre> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">let</span> filterTarget = piccy, filterString = <span class="hljs-string">'none'</span>;</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>Setup form functionality</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> <span class="hljs-title function_">updateTarget</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-keyword">let</span> val = e.<span class="hljs-property">target</span>.<span class="hljs-property">value</span>; <span class="hljs-keyword">if</span> (val) { piccy.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">filter</span>: <span class="hljs-string">'none'</span>}); text.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">filter</span>: <span class="hljs-string">'none'</span>}); canvas.<span class="hljs-title function_">setBase</span>({ <span class="hljs-attr">filter</span>: <span class="hljs-string">'none'</span>}); <span class="hljs-keyword">if</span> (val === <span class="hljs-string">'picture'</span>) filterTarget = piccy;</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (val === <span class="hljs-string">'phrase'</span>) filterTarget = text; <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (val === <span class="hljs-string">'cell'</span>) filterTarget = canvas.<span class="hljs-property">base</span>; filterTarget.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">filter</span>: filterString }); } }; scrawl.<span class="hljs-title function_">addNativeListener</span>([<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>], updateTarget, <span class="hljs-string">'#target'</span>); <span class="hljs-keyword">let</span> <span class="hljs-title function_">updateFilter</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-keyword">if</span> (e.<span class="hljs-property">target</span> && e.<span class="hljs-property">target</span>.<span class="hljs-property">value</span>) { filterString = e.<span class="hljs-property">target</span>.<span class="hljs-property">value</span>; filterTarget.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">filter</span>: filterString }); } }; scrawl.<span class="hljs-title function_">addNativeListener</span>([<span class="hljs-string">'input'</span>, <span class="hljs-string">'change'</span>], updateFilter, <span class="hljs-string">'#filter'</span>);</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#filter'</span>).<span class="hljs-property">options</span>.<span class="hljs-property">selectedIndex</span> = <span class="hljs-number">0</span>;</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#target'</span>).<span class="hljs-property">options</span>.<span class="hljs-property">selectedIndex</span> = <span class="hljs-number">0</span>;</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</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>