scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="demo-filters-024">Demo Filters 024</h1>
<p>Filter parameters: curveWeights</p>
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<p><a href="../../demo/filters-024.html">Run code</a></p>
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<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> { addImageDragAndDrop } <span class="hljs-keyword">from</span> <span class="hljs-string">'./utilities.js'</span>;</pre></div></div>
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</div>
<h4 id="scene-setup">Scene setup</h4>
</div>
<div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">importDomImage</span>(<span class="hljs-string">'.flowers'</span>);
<span class="hljs-keyword">const</span> oCanvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'output-canvas'</span>];
<span class="hljs-keyword">const</span> wCanvas = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">canvas</span>[<span class="hljs-string">'channel-weights-canvas'</span>];</pre></div></div>
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</div>
<h4 id="curves-filter">Curves filter</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> weights = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Array</span>(<span class="hljs-number">1024</span>);
weights.<span class="hljs-title function_">fill</span>(<span class="hljs-number">0</span>);
<span class="hljs-keyword">const</span> myFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'my-filter'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'curveWeights'</span>,
<span class="hljs-attr">weights</span>: [...weights],
});</pre></div></div>
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<h4 id="output-canvas">Output canvas</h4>
</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">group</span>: oCanvas.<span class="hljs-property">base</span>.<span class="hljs-property">name</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-attr">filters</span>: [<span class="hljs-string">'my-filter'</span>],
});</pre></div></div>
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<div class="sswrap ">
<a class="ss" href="#section-6">§</a>
</div>
<h4 id="weights-canvas">Weights canvas</h4>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> curvesCell = wCanvas.<span class="hljs-title function_">buildCell</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'curves-cell'</span>,
<span class="hljs-attr">dimensions</span>: [<span class="hljs-number">360</span>, <span class="hljs-number">360</span>],
});
<span class="hljs-keyword">const</span> curveArray = [<span class="hljs-string">'red'</span>, <span class="hljs-string">'green'</span>, <span class="hljs-string">'blue'</span>, <span class="hljs-string">'black'</span>];
curveArray.<span class="hljs-title function_">forEach</span>(<span class="hljs-function">(<span class="hljs-params">name, index</span>) =></span> {
scrawl.<span class="hljs-title function_">makeGroup</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pins-group`</span>,
<span class="hljs-attr">host</span>: wCanvas.<span class="hljs-property">base</span>.<span class="hljs-property">name</span>,
<span class="hljs-attr">order</span>: index,
});
scrawl.<span class="hljs-title function_">makeWheel</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-start`</span>,
<span class="hljs-attr">group</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pins-group`</span>,
<span class="hljs-attr">radius</span>: <span class="hljs-number">12</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-number">0</span>, <span class="hljs-number">360</span>],
<span class="hljs-attr">fillStyle</span>: name,
<span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'gold'</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,
<span class="hljs-attr">handle</span>: [<span class="hljs-string">'center'</span>, <span class="hljs-string">'center'</span>],
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-cs`</span>,
<span class="hljs-attr">radius</span>: <span class="hljs-number">8</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-number">120</span>, <span class="hljs-number">240</span>],
<span class="hljs-attr">method</span>: <span class="hljs-string">'fill'</span>,
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-ce`</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-number">240</span>, <span class="hljs-number">120</span>],
}).<span class="hljs-title function_">clone</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-end`</span>,
<span class="hljs-attr">radius</span>: <span class="hljs-number">12</span>,
<span class="hljs-attr">start</span>: [<span class="hljs-number">360</span>, <span class="hljs-number">0</span>],
<span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>,
});
scrawl.<span class="hljs-title function_">makeBezier</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-bezier`</span>,
<span class="hljs-attr">group</span>: <span class="hljs-string">'curves-cell'</span>,
<span class="hljs-attr">strokeStyle</span>: name,
<span class="hljs-attr">lineWidth</span>: <span class="hljs-number">1</span>,
<span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>,
<span class="hljs-attr">pivot</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-start`</span>,
<span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">startControlPivot</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-cs`</span>,
<span class="hljs-attr">startControlLockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">endControlPivot</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-ce`</span>,
<span class="hljs-attr">endControlLockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">endPivot</span>: <span class="hljs-string">`<span class="hljs-subst">${name}</span>-pin-end`</span>,
<span class="hljs-attr">endLockTo</span>: <span class="hljs-string">'pivot'</span>,
<span class="hljs-attr">useStartAsControlPoint</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">useAsPath</span>: <span class="hljs-literal">true</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="user-interaction">User interaction</h4>
<p>Create the drag-and-drop zone</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> draggedPin;
<span class="hljs-keyword">let</span> dragGroup = scrawl.<span class="hljs-title function_">makeGroup</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">'drag-group'</span>,
});
dragGroup.<span class="hljs-title function_">addArtefacts</span>(<span class="hljs-string">'black-pin-start'</span>, <span class="hljs-string">'black-pin-cs'</span>, <span class="hljs-string">'black-pin-ce'</span>, <span class="hljs-string">'black-pin-end'</span>);
<span class="hljs-keyword">const</span> currentPin = scrawl.<span class="hljs-title function_">makeDragZone</span>({
<span class="hljs-attr">zone</span>: wCanvas,
<span class="hljs-attr">collisionGroup</span>: <span class="hljs-string">'drag-group'</span>,
<span class="hljs-attr">endOn</span>: [<span class="hljs-string">'up'</span>, <span class="hljs-string">'leave'</span>],
<span class="hljs-attr">exposeCurrentArtefact</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">preventTouchDefaultWhenDragging</span>: <span class="hljs-literal">true</span>,
<span class="hljs-attr">updateOnStart</span>: <span class="hljs-function">() =></span> {
draggedPin = <span class="hljs-title function_">currentPin</span>();
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> draggedPin != <span class="hljs-string">'boolean'</span> && draggedPin) {
<span class="hljs-keyword">let</span> pin = draggedPin.<span class="hljs-property">artefact</span>,
name = pin.<span class="hljs-property">name</span>;
<span class="hljs-keyword">if</span> (name.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'start'</span>) > <span class="hljs-number">0</span> || name.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'end'</span>) > <span class="hljs-number">0</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> pin.<span class="hljs-property">isBeingDragged</span> = <span class="hljs-literal">false</span>;
pin.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">lockXTo</span>: <span class="hljs-string">'mouse'</span>,
});
}
}
},
<span class="hljs-attr">updateOnEnd</span>: <span class="hljs-function">() =></span> {
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> draggedPin != <span class="hljs-string">'boolean'</span> && draggedPin) {
<span class="hljs-keyword">let</span> pin = draggedPin.<span class="hljs-property">artefact</span>,
name = pin.<span class="hljs-property">name</span>;
<span class="hljs-keyword">if</span> (name.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'start'</span>) > <span class="hljs-number">0</span> || name.<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'end'</span>) > <span class="hljs-number">0</span>) {
pin.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">start</span>: pin.<span class="hljs-title function_">get</span>(<span class="hljs-string">'position'</span>),
<span class="hljs-attr">lockXTo</span>: <span class="hljs-string">'start'</span>,
});
}
}
draggedPin = <span class="hljs-literal">false</span>;
<span class="hljs-title function_">recalculateWeights</span>();
},
});</pre></div></div>
</li>
<li id="section-9">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-9">§</a>
</div>
<p>Filter weights recalculation</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> recalculateWeights = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">const</span> allCurve = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">entity</span>[<span class="hljs-string">'black-bezier'</span>],
redCurve = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">entity</span>[<span class="hljs-string">'red-bezier'</span>],
greenCurve = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">entity</span>[<span class="hljs-string">'green-bezier'</span>],
blueCurve = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">entity</span>[<span class="hljs-string">'blue-bezier'</span>];
<span class="hljs-keyword">const</span> step = <span class="hljs-number">360</span> / <span class="hljs-number">256</span>,
inverseStep = <span class="hljs-number">256</span> / <span class="hljs-number">360</span>;
<span class="hljs-keyword">const</span> { engine, element } = curvesCell;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">const</span> [startAllX, temp0] = allCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'position'</span>);
<span class="hljs-keyword">const</span> [endAllX, temp1] = allCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'endPosition'</span>);
<span class="hljs-keyword">const</span> [startRedX, temp2] = redCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'position'</span>);
<span class="hljs-keyword">const</span> [endRedX, temp3] = redCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'endPosition'</span>);
<span class="hljs-keyword">const</span> [startGreenX, temp4] = greenCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'position'</span>);
<span class="hljs-keyword">const</span> [endGreenX, temp5] = greenCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'endPosition'</span>);
<span class="hljs-keyword">const</span> [startBlueX, temp6] = blueCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'position'</span>);
<span class="hljs-keyword">const</span> [endBlueX, temp7] = blueCurve.<span class="hljs-title function_">get</span>(<span class="hljs-string">'endPosition'</span>);
<span class="hljs-keyword">const</span> redArray = [],
greenArray = [],
blueArray = [],
a