scrawl-canvas

<!DOCTYPE html> <html> <head> <title>Demo Filters 104</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 class="source" href="canvas-007.html"> ./demo/canvas-007.js </a> <a class="source" href="canvas-008.html"> ./demo/canvas-008.js </a> <a class="source" href="canvas-009.html"> ./demo/canvas-009.js </a> <a class="source" href="canvas-010.html"> ./demo/canvas-010.js </a> <a class="source" href="canvas-011.html"> ./demo/canvas-011.js </a> <a class="source" href="canvas-012.html"> ./demo/canvas-012.js </a> <a class="source" href="canvas-013.html"> ./demo/canvas-013.js </a> <a class="source" href="canvas-014.html"> ./demo/canvas-014.js </a> <a class="source" href="canvas-015.html"> ./demo/canvas-015.js </a> <a class="source" href="canvas-015a.html"> ./demo/canvas-015a.js </a> <a class="source" href="canvas-016.html"> ./demo/canvas-016.js </a> <a class="source" href="canvas-017.html"> ./demo/canvas-017.js </a> <a class="source" href="canvas-018.html"> ./demo/canvas-018.js </a> <a class="source" href="canvas-019.html"> ./demo/canvas-019.js </a> <a class="source" href="canvas-019a.html"> ./demo/canvas-019a.js </a> <a class="source" href="canvas-020.html"> ./demo/canvas-020.js </a> <a class="source" href="canvas-021.html"> ./demo/canvas-021.js </a> <a class="source" href="canvas-022.html"> ./demo/canvas-022.js </a> <a class="source" href="canvas-023.html"> ./demo/canvas-023.js </a> <a class="source" href="canvas-024.html"> ./demo/canvas-024.js </a> <a class="source" href="canvas-025.html"> ./demo/canvas-025.js </a> <a class="source" href="canvas-026.html"> ./demo/canvas-026.js </a> <a class="source" href="canvas-027.html"> ./demo/canvas-027.js </a> <a class="source" href="canvas-028.html"> ./demo/canvas-028.js </a> <a class="source" href="canvas-029.html"> ./demo/canvas-029.js </a> <a class="source" href="canvas-030.html"> ./demo/canvas-030.js </a> <a class="source" href="canvas-031.html"> ./demo/canvas-031.js </a> <a class="source" href="canvas-032.html"> ./demo/canvas-032.js </a> <a class="source" href="canvas-033.html"> ./demo/canvas-033.js </a> <a class="source" href="canvas-034.html"> ./demo/canvas-034.js </a> <a class="source" href="canvas-035.html"> ./demo/canvas-035.js </a> <a class="source" href="canvas-036.html"> ./demo/canvas-036.js </a> <a class="source" href="canvas-037.html"> ./demo/canvas-037.js </a> <a class="source" href="canvas-038.html"> ./demo/canvas-038.js </a> <a class="source" href="canvas-039.html"> ./demo/canvas-039.js </a> <a class="source" href="canvas-040.html"> ./demo/canvas-040.js </a> <a class="source" href="canvas-041.html"> ./demo/canvas-041.js </a> <a class="source" href="canvas-042.html"> ./demo/canvas-042.js </a> <a class="source" href="canvas-043.html"> ./demo/canvas-043.js </a> <a class="source" href="canvas-044.html"> ./demo/canvas-044.js </a> <a class="source" href="canvas-045.html"> ./demo/canvas-045.js </a> <a class="source" href="canvas-046.html"> ./demo/canvas-046.js </a> <a class="source" href="canvas-047.html"> ./demo/canvas-047.js </a> <a class="source" href="canvas-048.html"> ./demo/canvas-048.js </a> <a class="source" href="canvas-049.html"> ./demo/canvas-049.js </a> <a class="source" href="canvas-050.html"> ./demo/canvas-050.js </a> <a class="source" href="canvas-051.html"> ./demo/canvas-051.js </a> <a class="source" href="canvas-052.html"> ./demo/canvas-052.js </a> <a class="source" href="canvas-053.html"> ./demo/canvas-053.js </a> <a class="source" href="canvas-054.html"> ./demo/canvas-054.js </a> <a class="source" href="canvas-055.html"> ./demo/canvas-055.js </a> <a class="source" href="canvas-056.html"> ./demo/canvas-056.js </a> <a class="source" href="canvas-057.html"> ./demo/canvas-057.js </a> <a class="source" href="canvas-058.html"> ./demo/canvas-058.js </a> <a class="source" href="canvas-059.html"> ./demo/canvas-059.js </a> <a class="source" href="canvas-060.html"> ./demo/canvas-060.js </a> <a class="source" href="canvas-061.html"> ./demo/canvas-061.js </a> <a class="source" href="canvas-062.html"> ./demo/canvas-062.js </a> <a class="source" href="canvas-063.html"> ./demo/canvas-063.js </a> <a class="source" href="canvas-064.html"> ./demo/canvas-064.js </a> <a class="source" href="core-001.html"> ./demo/core-001.js </a> <a class="source" href="delaunator-001.html"> ./demo/delaunator-001.js </a> <a class="source" href="delaunator-002.html"> ./demo/delaunator-002.js </a> <a class="source" href="dom-001.html"> ./demo/dom-001.js </a> <a class="source" href="dom-002.html"> ./demo/dom-002.js </a> <a class="source" href="dom-003.html"> ./demo/dom-003.js </a> <a class="source" href="dom-004.html"> ./demo/dom-004.js </a> <a class="source" href="dom-005.html"> ./demo/dom-005.js </a> <a class="source" href="dom-006.html"> ./demo/dom-006.js </a> <a class="source" href="dom-007.html"> ./demo/dom-007.js </a> <a class="source" href="dom-008.html"> ./demo/dom-008.js </a> <a class="source" href="dom-009.html"> ./demo/dom-009.js </a> <a class="source" href="dom-010.html"> ./demo/dom-010.js </a> <a class="source" href="dom-011.html"> ./demo/dom-011.js </a> <a class="source" href="dom-012.html"> ./demo/dom-012.js </a> <a class="source" href="dom-013.html"> ./demo/dom-013.js </a> <a class="source" href="dom-015.html"> ./demo/dom-015.js </a> <a class="source" href="dom-016.html"> ./demo/dom-016.js </a> <a class="source" href="filters-001.html"> ./demo/filters-001.js </a> <a class="source" href="filters-002.html"> ./demo/filters-002.js </a> <a class="source" href="filters-002a.html"> ./demo/filters-002a.js </a> <a class="source" href="filters-003.html"> ./demo/filters-003.js </a> <a class="source" href="filters-004.html"> ./demo/filters-004.js </a> <a class="source" href="filters-005.html"> ./demo/filters-005.js </a> <a class="source" href="filters-006.html"> ./demo/filters-006.js </a> <a class="source" href="filters-007.html"> ./demo/filters-007.js </a> <a class="source" href="filters-008.html"> ./demo/filters-008.js </a> <a class="source" href="filters-009.html"> ./demo/filters-009.js </a> <a class="source" href="filters-010.html"> ./demo/filters-010.js </a> <a class="source" href="filters-011.html"> ./demo/filters-011.js </a> <a class="source" href="filters-012.html"> ./demo/filters-012.js </a> <a class="source" href="filters-013.html"> ./demo/filters-013.js </a> <a class="source" href="filters-014.html"> ./demo/filters-014.js </a> <a class="source" href="filters-015.html"> ./demo/filters-015.js </a> <a class="source" href="filters-016.html"> ./demo/filters-016.js </a> <a class="source" href="filters-017.html"> ./demo/filters-017.js </a> <a class="source" href="filters-018.html"> ./demo/filters-018.js </a> <a class="source" href="filters-019.html"> ./demo/filters-019.js </a> <a class="source" href="filters-020.html"> ./demo/filters-020.js </a> <a class="source" href="filters-021.html"> ./demo/filters-021.js </a> <a class="source" href="filters-022.html"> ./demo/filters-022.js </a> <a class="source" href="filters-023.html"> ./demo/filters-023.js </a> <a class="source" href="filters-024.html"> ./demo/filters-024.js </a> <a class="source" href="filters-025.html"> ./demo/filters-025.js </a> <a class="source" href="filters-026.html"> ./demo/filters-026.js </a> <a class="source" href="filters-027.html"> ./demo/filters-027.js </a> <a class="source" href="filters-101.html"> ./demo/filters-101.js </a> <a class="source" href="filters-102.html"> ./demo/filters-102.js </a> <a class="source" href="filters-103.html"> ./demo/filters-103.js </a> <a class="source" href="filters-104.html"> ./demo/filters-104.js </a> <a class="source" href="filters-105.html"> ./demo/filters-105.js </a> <a class="source" href="filters-501.html"> ./demo/filters-501.js </a> <a class="source" href="filters-502.html"> ./demo/filters-502.js </a> <a class="source" href="filters-503.html"> ./demo/filters-503.js </a> <a class="source" href="filters-504.html"> ./demo/filters-504.js </a> <a class="source" href="filters-505.html"> ./demo/filters-505.js </a> <a class="source" href="mediapipe-001.html"> ./demo/mediapipe-001.js </a> <a class="source" href="mediapipe-002.html"> ./demo/mediapipe-002.js </a> <a class="source" href="mediapipe-003.html"> ./demo/mediapipe-003.js </a> <a class="source" href="modules-001.html"> ./demo/modules-001.js </a> <a class="source" href="modules-002.html"> ./demo/modules-002.js </a> <a class="source" href="modules-003.html"> ./demo/modules-003.js </a> <a class="source" href="modules-004.html"> ./demo/modules-004.js </a> <a class="source" href="modules-005.html"> ./demo/modules-005.js </a> <a class="source" href="packets-001.html"> ./demo/packets-001.js </a> <a class="source" href="packets-002.html"> ./demo/packets-002.js </a> <a class="source" href="particles-001.html"> ./demo/particles-001.js </a> <a class="source" href="particles-002.html"> ./demo/particles-002.js </a> <a class="source" href="particles-003.html"> ./demo/particles-003.js </a> <a class="source" href="particles-004.html"> ./demo/particles-004.js </a> <a class="source" href="particles-005.html"> ./demo/particles-005.js </a> <a class="source" href="particles-006.html"> ./demo/particles-006.js </a> <a class="source" href="particles-007.html"> ./demo/particles-007.js </a> <a class="source" href="particles-008.html"> ./demo/particles-008.js </a> <a class="source" href="particles-009.html"> ./demo/particles-009.js </a> <a class="source" href="particles-010.html"> ./demo/particles-010.js </a> <a class="source" href="particles-011.html"> ./demo/particles-011.js </a> <a class="source" href="particles-012.html"> ./demo/particles-012.js </a> <a class="source" href="particles-013.html"> ./demo/particles-013.js </a> <a class="source" href="particles-014.html"> ./demo/particles-014.js </a> <a class="source" href="particles-015.html"> ./demo/particles-015.js </a> <a class="source" href="particles-016.html"> ./demo/particles-016.js </a> <a class="source" href="rapier-001.html"> ./demo/rapier-001.js </a> <a class="source" href="snippets-001.html"> ./demo/snippets-001.js </a> <a class="source" href="snippets-002.html"> ./demo/snippets-002.js </a> <a class="source" href="snippets-003.html"> ./demo/snippets-003.js </a> <a class="source" href="snippets-004.html"> ./demo/snippets-004.js </a> <a class="source" href="snippets-005.html"> ./demo/snippets-005.js </a> <a class="source" href="snippets-006.html"> ./demo/snippets-006.js </a> <a class="source" href="temp-000.html"> ./demo/temp-000.js </a> <a class="source" href="temp-001.html"> ./demo/temp-001.js </a> <a class="source" href="temp-001a.html"> ./demo/temp-001a.js </a> <a class="source" href="temp-002.html"> ./demo/temp-002.js </a> <a class="source" href="temp-003.html"> ./demo/temp-003.js </a> <a class="source" href="temp-004.html"> ./demo/temp-004.js </a> <a class="source" href="temp-005.html"> ./demo/temp-005.js </a> <a class="source" href="temp-006.html"> ./demo/temp-006.js </a> <a class="source" href="temp-007.html"> ./demo/temp-007.js </a> <a class="source" href="temp-008.html"> ./demo/temp-008.js </a> <a class="source" href="temp-009.html"> ./demo/temp-009.js </a> <a class="source" href="temp-010.html"> ./demo/temp-010.js </a> <a class="source" href="temp-011.html"> ./demo/temp-011.js </a> <a class="source" href="temp-012.html"> ./demo/temp-012.js </a> <a class="source" href="temp-013.html"> ./demo/temp-013.js </a> <a class="source" href="temp-014.html"> ./demo/temp-014.js </a> <a class="source" href="temp-015.html"> ./demo/temp-015.js </a> <a class="source" href="temp-016.html"> ./demo/temp-016.js </a> <a class="source" href="temp-017.html"> ./demo/temp-017.js </a> <a class="source" href="temp-018.html"> ./demo/temp-018.js </a> <a class="source" href="temp-018a.html"> ./demo/temp-018a.js </a> <a class="source" href="temp-019.html"> ./demo/temp-019.js </a> <a class="source" href="temp-020.html"> ./demo/temp-020.js </a> <a class="source" href="temp-021.html"> ./demo/temp-021.js </a> <a class="source" href="temp-022.html"> ./demo/temp-022.js </a> <a class="source" href="temp-023.html"> ./demo/temp-023.js </a> <a class="source" href="temp-024.html"> ./demo/temp-024.js </a> <a class="source" href="temp-025.html"> ./demo/temp-025.js </a> <a class="source" href="temp-026.html"> ./demo/temp-026.js </a> <a class="source" href="temp-027.html"> ./demo/temp-027.js </a> <a class="source" href="temp-028.html"> ./demo/temp-028.js </a> <a class="source" href="temp-029.html"> ./demo/temp-029.js </a> <a class="source" href="temp-030.html"> ./demo/temp-030.js </a> <a class="source" href="temp-031.html"> ./demo/temp-031.js </a> <a class="source" href="temp-032.html"> ./demo/temp-032.js </a> <a class="source" href="temp-033.html"> ./demo/temp-033.js </a> <a class="source" href="temp-034.html"> ./demo/temp-034.js </a> <a class="source" href="temp-035.html"> ./demo/temp-035.js </a> <a class="source" href="temp-036.html"> ./demo/temp-036.js </a> <a class="source" href="temp-037.html"> ./demo/temp-037.js </a> <a class="source" href="temp-100.html"> ./demo/temp-100.js </a> <a class="source" href="temp-101.html"> ./demo/temp-101.js </a> <a class="source" href="temp-102.html"> ./demo/temp-102.js </a> <a class="source" href="temp-103.html"> ./demo/temp-103.js </a> <a class="source" href="temp-104.html"> ./demo/temp-104.js </a> <a class="source" href="temp-200.html"> ./demo/temp-200.js </a> <a class="source" href="temp-201.html"> ./demo/temp-201.js </a> <a class="source" href="temp-301.html"> ./demo/temp-301.js </a> <a class="source" href="temp-inkscapeSvgFilters.html"> ./demo/temp-inkscapeSvgFilters.js </a> <a class="source" href="temp-lottie.html"> ./demo/temp-lottie.js </a> <a class="source" href="tensorflow-001.html"> ./demo/tensorflow-001.js </a> <a class="source" href="tensorflow-002.html"> ./demo/tensorflow-002.js </a> <a class="source" href="utilities.html"> ./demo/utilities.js </a> </div> </div> </li> </ul> <ul class="sections"> <li id="section-1"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-filters-104">Demo Filters 104</h1> <p>Compound filters: Use a white-transparent gradient as a filter input</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-104.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>;</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>The base cell needs to compile after the helper cells we’re about to create</p> </div> <div class="content"><div class='highlight'><pre>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-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <h4 id="gradients-and-pattern-definitions">Gradients and pattern definitions</h4> <p>We display the gradients in a Block entity, in a dedicated Cell</p> <ul> <li>The Cell will act as a pattern source for entitys elsewhere</li> <li>Because we’re using it as a pattern, the Cell comes with a pattern matrix</li> <li>The pattern matrix lets us warp and stretch the pattern to meet our needs</li> </ul> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> patternCell = canvas.<span class="hljs-title function_">buildCell</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bar-cell-pattern'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-number">80</span>, <span class="hljs-number">80</span>], <span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">useAsPattern</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">skewX</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">stretchX</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">shiftX</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">skewY</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">stretchY</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">shiftY</span>: <span class="hljs-number">0</span>, }); <span class="hljs-keyword">const</span> barGradient = scrawl.<span class="hljs-title function_">makeGradient</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bar-cell-gradient'</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">'transparent'</span>], [<span class="hljs-number">199</span>, <span class="hljs-string">'transparent'</span>], [<span class="hljs-number">499</span>, <span class="hljs-string">'white'</span>], [<span class="hljs-number">799</span>, <span class="hljs-string">'transparent'</span>], [<span class="hljs-number">999</span>, <span class="hljs-string">'transparent'</span>], ], }); <span class="hljs-keyword">const</span> ringGradient = scrawl.<span class="hljs-title function_">makeRadialGradient</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'ring-cell-gradient'</span>, <span class="hljs-attr">startX</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">startY</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">endX</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">endY</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">startRadius</span>: <span class="hljs-string">'0%'</span>, <span class="hljs-attr">endRadius</span>: <span class="hljs-string">'50%'</span>, <span class="hljs-attr">colors</span>: [ [<span class="hljs-number">0</span>, <span class="hljs-string">'transparent'</span>], [<span class="hljs-number">199</span>, <span class="hljs-string">'transparent'</span>], [<span class="hljs-number">499</span>, <span class="hljs-string">'white'</span>], [<span class="hljs-number">799</span>, <span class="hljs-string">'transparent'</span>], [<span class="hljs-number">999</span>, <span class="hljs-string">'transparent'</span>], ], }); <span class="hljs-keyword">const</span> <span class="hljs-title function_">updateGradients</span> = (<span class="hljs-params">items</span>) => { barGradient.<span class="hljs-title function_">set</span>(items); ringGradient.<span class="hljs-title function_">set</span>(items); }; <span class="hljs-keyword">const</span> filterBlock = scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bar-cell-box'</span>, <span class="hljs-attr">group</span>: <span class="hljs-string">'bar-cell-pattern'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'100%'</span>], <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'bar-cell-gradient'</span>, });</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <h4 id="build-an-image-source-for-our-compound-filter">Build an image source for our compound filter</h4> <p>We can use anything that generates image data as part of our filter</p> <ul> <li>This includes a new Cell, which will display a Block entity</li> <li>The Block entity uses our pattern Cell for its <code>fillStyle</code> attribute</li> </ul> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> filterCell = canvas.<span class="hljs-title function_">buildCell</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bar-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'100%'</span>], <span class="hljs-attr">shown</span>: <span class="hljs-literal">false</span>, }); scrawl.<span class="hljs-title function_">makeBlock</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bar-base-box'</span>, <span class="hljs-attr">group</span>: <span class="hljs-string">'bar-cell'</span>, <span class="hljs-attr">dimensions</span>: [<span class="hljs-string">'100%'</span>, <span class="hljs-string">'100%'</span>], <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'bar-cell-pattern'</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="filter-definitions">Filter definitions</h4> <p>Define our filters - we’ll populate them with actions data later</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> glassBarsFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'glass-bars'</span> }), displaceBarsFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'displace-bars'</span> }), etchingFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'etching'</span> }), greenMonitorFilter = scrawl.<span class="hljs-title function_">makeFilter</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'green-monitor'</span> });</pre></div></div> </li> <li id="section-8"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-8">§</a> </div> <p>We define some variables and helper functions here, to cut down on code</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> fOffsetX = <span class="hljs-number">0</span>, fOffsetY = <span class="hljs-number">0</span>, fOpacity = <span class="hljs-number">1</span>, fBlend = <span class="hljs-string">'multiply'</span>, fDisplaceX = <span class="hljs-number">10</span>, fDisplaceY = <span class="hljs-number">10</span>;</pre></div></div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>All the examples make use of the gradient pattern; this filter loads it into the engine</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getProcessImageFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'process-image'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'bar-cell'</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">lineOut</span>: <span class="hljs-string">'bars'</span>, }]; };</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</a> </div> <p>Three of the examples use a blend filter to merge the gradient pattern into the image</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getBlendFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'blend'</span>, <span class="hljs-attr">lineMix</span>: <span class="hljs-string">'bars'</span>, <span class="hljs-attr">blend</span>: fBlend, <span class="hljs-attr">offsetX</span>: fOffsetX, <span class="hljs-attr">offsetY</span>: fOffsetY, <span class="hljs-attr">opacity</span>: fOpacity, }]; };</pre></div></div> </li> <li id="section-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>This uses the gradient pattern as a displacement map for the displace filter</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getDisplaceFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'displace'</span>, <span class="hljs-attr">lineMix</span>: <span class="hljs-string">'bars'</span>, <span class="hljs-attr">offsetX</span>: fOffsetX, <span class="hljs-attr">offsetY</span>: fOffsetY, <span class="hljs-attr">opacity</span>: fOpacity, <span class="hljs-attr">scaleX</span>: fDisplaceX, <span class="hljs-attr">scaleY</span>: fDisplaceY, }]; };</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Several filters require the image to be grayscaled at the start of the processing chain</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getGrayscaleFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'grayscale'</span>, }]; };</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>Filters to configure the image (make it green) before applying the blend filter</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getMonitorFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'modulate-channels'</span>, <span class="hljs-attr">red</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">green</span>: <span class="hljs-number">1.3</span>, <span class="hljs-attr">blue</span>: <span class="hljs-number">0</span>, }]; };</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <p>Filters to configure the image (give it a black-white drawing effect) before applying the blend filter</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title function_">getEtchFilter</span> = (<span class="hljs-params"></span>) => { <span class="hljs-keyword">return</span> [{ <span class="hljs-attr">action</span>: <span class="hljs-string">'gaussian-blur'</span>, <span class="hljs-attr">radius</span>: <span class="hljs-number">1</span>, }, { <span class="hljs-attr">action</span>: <span class="hljs-string">'matrix'</span>, <span class="hljs-attr">weights</span>: [<span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, -<span class="hljs-number">8</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>], }, { <span class="hljs-attr">action</span>: <span class="hljs-string">'invert-channels'</span>, }, { <span class="hljs-attr">action</span>: <span class="hljs-string">&#x