scrawl-canvas

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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-filters-101">Demo Filters 101</h1> <p>Using assets in the filter stream; filter compositing</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-101.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, addImageDragAndDrop } <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>; canvas.<span class="hljs-title function_">setBase</span>({ <span class="hljs-attr">compileOrder</span>: <span class="hljs-number">1</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 assets</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">importDomImage</span>(<span class="hljs-string">'.flowers'</span>); canvas.<span class="hljs-title function_">buildCell</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'star-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">400</span>, <span class="hljs-number">400</span>], <span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>, }); scrawl.<span class="hljs-title function_">makeStar</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-star'</span>, <span class="hljs-attr">group</span>: <span class="hljs-string">'star-cell'</span>, <span class="hljs-attr">radius1</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">radius2</span>: <span class="hljs-number">100</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">60</span>, <span class="hljs-attr">points</span>: <span class="hljs-number">4</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">fillStyle</span>: <span class="hljs-string">'blue'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>, }); canvas.<span class="hljs-title function_">buildCell</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'wheel-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">400</span>, <span class="hljs-number">400</span>], <span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>, }); scrawl.<span class="hljs-title function_">makeWheel</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'my-wheel'</span>, <span class="hljs-attr">group</span>: <span class="hljs-string">'wheel-cell'</span>, <span class="hljs-attr">radius</span>: <span class="hljs-number">150</span>, <span class="hljs-attr">startAngle</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">endAngle</span>: -<span class="hljs-number">30</span>, <span class="hljs-attr">includeCenter</span>: <span class="hljs-literal">true</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">fillStyle</span>: <span class="hljs-string">'green'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>, <span class="hljs-attr">delta</span>: { <span class="hljs-attr">roll</span>: -<span class="hljs-number">0.3</span>, }, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>Create the filters</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">'star-filter'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'image'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'star-cell'</span>, <span class="hljs-attr">width</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">height</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">copyWidth</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">copyHeight</span>: <span class="hljs-number">400</span>, <span class="hljs-attr">lineOut</span>: <span class="hljs-string">'star'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'wheel-filter'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'wheel-cell'</span>, <span class="hljs-attr">lineOut</span>: <span class="hljs-string">'wheel'</span>, }); <span class="hljs-keyword">const</span> imageFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'flower-filter'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'image'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'iris'</span>, <span class="hljs-attr">width</span>: <span class="hljs-string">'80%'</span>, <span class="hljs-attr">height</span>: <span class="hljs-string">'80%'</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">lineOut</span>: <span class="hljs-string">'flower'</span>, }); <span class="hljs-keyword">let</span> composeFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'block-filter'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'compose'</span>, <span class="hljs-attr">lineIn</span>: <span class="hljs-string">'star'</span>, <span class="hljs-attr">lineMix</span>: <span class="hljs-string">'source'</span>, <span class="hljs-attr">offsetX</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">offsetY</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">compose</span>: <span class="hljs-string">'source-over'</span>, });</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Display the filter in a Block entity</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeGradient</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'linear'</span>, <span class="hljs-attr">endX</span>: <span class="hljs-string">'100%'</span>, <span class="hljs-attr">colors</span>: [ [<span class="hljs-number">0</span>, <span class="hljs-string">'blue'</span>], [<span class="hljs-number">495</span>, <span class="hljs-string">'red'</span>], [<span class="hljs-number">500</span>, <span class="hljs-string">'yellow'</span>], [<span class="hljs-number">505</span>, <span class="hljs-string">'red'</span>], [<span class="hljs-number">999</span>, <span class="hljs-string">'green'</span>] ], }); scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'display-block'</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">dimensions</span>: [<span class="hljs-string">'90%'</span>, <span class="hljs-string">'90%'</span>], <span class="hljs-attr">roll</span>: -<span class="hljs-number">20</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'linear'</span>, <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">method</span>: <span class="hljs-string">'fillThenDraw'</span>,</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Load in the three image filters, then the compose filter to combine two of them</p> <ul> <li>the results display in a Block entity!</li> </ul> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">filters</span>: [<span class="hljs-string">'star-filter'</span>, <span class="hljs-string">'wheel-filter'</span>, <span class="hljs-string">'flower-filter'</span>, <span class="hljs-string">'block-filter'</span>], });</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</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-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">return</span> <span class="hljs-string">` Offset - x: <span class="hljs-subst">${ox.value}</span>, y: <span class="hljs-subst">${oy.value}</span>\n Opacity: <span class="hljs-subst">${opacity.value}</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>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-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <h4 id="user-interaction">User interaction</h4> <p>Setup form observer functionality</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<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>: composeFilter, <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">source</span>: [<span class="hljs-string">'lineIn'</span>, <span class="hljs-string">'raw'</span>], <span class="hljs-attr">destination</span>: [<span class="hljs-string">'lineMix'</span>, <span class="hljs-string">'raw'</span>], <span class="hljs-attr">composite</span>: [<span class="hljs-string">'compose'</span>, <span class="hljs-string">'raw'</span>], <span class="hljs-attr">opacity</span>: [<span class="hljs-string">'opacity'</span>, <span class="hljs-string">'float'</span>], <span class="hljs-string">'offset-x'</span>: [<span class="hljs-string">'offsetX'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-string">'offset-y'</span>: [<span class="hljs-string">'offsetY'</span>, <span class="hljs-string">'round'</span>], }, });</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Setup form</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> ox = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#offset-x'</span>), oy = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#offset-y'</span>), opacity = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelector</span>(<span class="hljs-string">'#opacity'</span>);</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>@ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre>opacity.<span class="hljs-property">value</span> = <span class="hljs-number">1</span>;</pre></div></div> </li> <li id="section-14"> <div class="annotation">