scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Canvas 027</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-027">Demo Canvas 027</h1> <p>Video control and manipulation; chroma-based hit zone</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-027.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>;</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>Importing the video file programmatically</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> myvideo = scrawl.<span class="hljs-title function_">makePicture</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-video'</span>, <span class="hljs-attr">videoSource</span>: <span class="hljs-string">'img/swans.mp4'</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-keyword">let</span> initialVideoStart = scrawl.<span class="hljs-title function_">addListener</span>(<span class="hljs-string">'up'</span>, <span class="hljs-function">() =></span> { myvideo.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">video_muted</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">video_loop</span>: <span class="hljs-literal">true</span>, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>Get rid of the event listener after invocation - it’s a one-time-only action</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-title function_">initialVideoStart</span>(); }, canvas.<span class="hljs-property">domElement</span>);</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>canvas-based buttons</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makePhrase</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-button-play-pause'</span>, <span class="hljs-attr">order</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">text</span>: <span class="hljs-string">'PLAY'</span>, <span class="hljs-attr">family</span>: <span class="hljs-string">'sans-serif'</span>, <span class="hljs-attr">size</span>: <span class="hljs-string">'2rem'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'75%'</span>, <span class="hljs-attr">handleX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-string">'90%'</span>, <span class="hljs-attr">letterSpacing</span>: <span class="hljs-number">2</span>, <span class="hljs-attr">underlinePosition</span>: <span class="hljs-number">0.75</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">underlineStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">onEnter</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { canvas.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">css</span>: { <span class="hljs-attr">cursor</span>: <span class="hljs-string">'pointer'</span>, } });</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>‘§UNDERLINE§’ is a section class marker which makes subsequent letters underlined <em><strong>Note:</strong></em> - dynamic underlining is currently not triggering in Firefox browser @ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">`§UNDERLINE§<span class="hljs-subst">${<span class="hljs-variable language_">this</span>.text}</span>`</span>, }); }, <span class="hljs-attr">onLeave</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { canvas.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">css</span>: { <span class="hljs-attr">cursor</span>: <span class="hljs-string">'auto'</span>, } });</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-variable language_">this</span>.<span class="hljs-property">text</span>.<span class="hljs-title function_">replace</span>(<span class="hljs-string">'§UNDERLINE§'</span>, <span class="hljs-string">''</span>), }); }, <span class="hljs-attr">onUp</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">if</span> (myvideo.<span class="hljs-title function_">get</span>(<span class="hljs-string">'video_paused'</span>)) {</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-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">'PAUSE'</span>, }); myvideo.<span class="hljs-title function_">videoPlay</span>(); } <span class="hljs-keyword">else</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_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">'PLAY'</span>, }); myvideo.<span class="hljs-title function_">videoPause</span>(); } }, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-button-listen-mute'</span>, <span class="hljs-attr">text</span>: <span class="hljs-string">'LISTEN'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'25%'</span>, <span class="hljs-attr">onUp</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) { <span class="hljs-keyword">if</span> (myvideo.<span class="hljs-title function_">get</span>(<span class="hljs-string">'video_muted'</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_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">'MUTE'</span>, }); myvideo.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">video_muted</span>: <span class="hljs-literal">false</span>, }); } <span class="hljs-keyword">else</span> {</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">text</span>: <span class="hljs-string">'LISTEN'</span>, }); myvideo.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">video_muted</span>: <span class="hljs-literal">true</span>, }); } }, });</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>Turn the swans pink</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'swan-mask'</span>, <span class="hljs-attr">actions</span>: [ { <span class="hljs-attr">action</span>: <span class="hljs-string">'threshold'</span>, <span class="hljs-attr">level</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">low</span>: [<span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>], <span class="hljs-attr">high</span>: [<span class="hljs-number">255</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>], }, { <span class="hljs-attr">action</span>: <span class="hljs-string">'channels-to-alpha'</span>, <span class="hljs-attr">includeGreen</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">includeBlue</span>: <span class="hljs-literal">false</span>, }, ], }); scrawl.<span class="hljs-title function_">makePicture</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'test-swan-image'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'swans'</span>, <span class="hljs-attr">width</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">height</span>: <span class="hljs-string">'55%'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-string">'25%'</span>, <span class="hljs-attr">copyWidth</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">copyHeight</span>: <span class="hljs-string">'55%'</span>, <span class="hljs-attr">copyStartY</span>: <span class="hljs-string">'25%'</span>, <span class="hljs-attr">filters</span>: [<span class="hljs-string">'swan-mask'</span>], <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.01</span>, <span class="hljs-attr">onEnter</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></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> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.1</span>, }); canvas.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">css</span>: { <span class="hljs-attr">cursor</span>: <span class="hljs-string">'pointer'</span>, } }); }, <span class="hljs-attr">onLeave</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.01</span>, }); canvas.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">css</span>: { <span class="hljs-attr">cursor</span>: <span class="hljs-string">'auto'</span>, } }); }, <span class="hljs-attr">onUp</span>: <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {</pre></div></div> </li> <li id="section-16"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-16">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">clickAnchor</span>(); }, <span class="hljs-attr">anchor</span>: { <span class="hljs-attr">name</span>: <span class="hljs-string">'wikipedia-swan-link'</span>, <span class="hljs-attr">href</span>: <span class="hljs-string">'https://en.wikipedia.org/wiki/Swan'</span>, <span class="hljs-attr">description</span>: <span class="hljs-string">'Link to the Wikipedia article on swans'</span>, <span class="hljs-attr">focusAction</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">blurAction</span>: <span class="hljs-literal">true</span>, }, <span class="hljs-attr">checkHitIgnoreTransparency</span>: <span class="hljs-literal">true</span>, });</pre></div></div> </li> <li id="section-17"> <div cl