scrawl-canvas

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class="sswrap "> <a class="ss" href="#section-1">§</a> </div> <h1 id="demo-dom-015">Demo DOM 015</h1> <p>Use stacked DOM artefact corners as pivot points</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/dom-015.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> <p>Create some useful variables for use elsewhere in the script</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> artefact = scrawl.<span class="hljs-property">library</span>.<span class="hljs-property">artefact</span>, stack = artefact.<span class="hljs-property">mystack</span>, element = artefact.<span class="hljs-property">myelement</span>, canvas = artefact.<span class="hljs-property">mycanvas</span>, cell = canvas.<span class="hljs-property">base</span>;</pre></div></div> </li> <li id="section-4"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-4">§</a> </div> <p>Give the stack element some depth</p> </div> <div class="content"><div class='highlight'><pre>stack.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">width</span>: <span class="hljs-number">600</span>, <span class="hljs-attr">height</span>:<span class="hljs-number">400</span>, <span class="hljs-attr">perspectiveZ</span>: <span class="hljs-number">1200</span>, });</pre></div></div> </li> <li id="section-5"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-5">§</a> </div> <p>Setup the main element</p> </div> <div class="content"><div class='highlight'><pre>element.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">startX</span>: <span class="hljs-number">300</span>, <span class="hljs-attr">startY</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">handleX</span>: <span class="hljs-number">100</span>, <span class="hljs-attr">handleY</span>: <span class="hljs-number">100</span>, <span class="hljs-attr">width</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">height</span>: <span class="hljs-number">200</span>, <span class="hljs-attr">roll</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">pitch</span>: <span class="hljs-number">20</span>, <span class="hljs-attr">yaw</span>: <span class="hljs-number">30</span>, <span class="hljs-attr">css</span>: { <span class="hljs-attr">borderWidth</span>: <span class="hljs-string">'0'</span>, <span class="hljs-attr">color</span>: <span class="hljs-string">'white'</span>, <span class="hljs-attr">textShadow</span>: <span class="hljs-string">'0 0 2px black'</span>, }, });</pre></div></div> </li> <li id="section-6"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-6">§</a> </div> <p>Import image from DOM</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">importDomImage</span>(<span class="hljs-string">'.flowers'</span>);</pre></div></div> </li> <li id="section-7"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-7">§</a> </div> <p>Create entitys to pivot to the element’s corners</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeLine</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'left-line'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">8</span>, <span class="hljs-attr">lineCap</span>: <span class="hljs-string">'round'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'draw'</span>, <span class="hljs-attr">pivot</span>: element, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'topLeft'</span>, <span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>, <span class="hljs-attr">useStartAsControlPoint</span>: <span class="hljs-literal">true</span>, <span class="hljs-attr">endPivot</span>: element, <span class="hljs-attr">endPivotCorner</span>: <span class="hljs-string">'bottomLeft'</span>, <span class="hljs-attr">endLockTo</span>: <span class="hljs-string">'pivot'</span>, <span class="hljs-attr">minimumBoundingBoxDimensions</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">useAsPath</span>: <span class="hljs-literal">true</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'right-line'</span>, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'topRight'</span>, <span class="hljs-attr">endPivotCorner</span>: <span class="hljs-string">'bottomRight'</span>, }); scrawl.<span class="hljs-title function_">makeWheel</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'top-left-wheel'</span>, <span class="hljs-attr">radius</span>: <span class="hljs-number">20</span>, <span class="hljs-attr">handleX</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">handleY</span>: <span class="hljs-string">'center'</span>, <span class="hljs-attr">fillStyle</span>: <span class="hljs-string">'red'</span>, <span class="hljs-attr">strokeStyle</span>: <span class="hljs-string">'yellow'</span>, <span class="hljs-attr">lineWidth</span>: <span class="hljs-number">8</span>, <span class="hljs-attr">globalAlpha</span>: <span class="hljs-number">0.6</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fillThenDraw'</span>, <span class="hljs-attr">pivot</span>: element, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'topLeft'</span>, <span class="hljs-attr">lockTo</span>: <span class="hljs-string">'pivot'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'top-right-wheel'</span>, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'topRight'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bottom-right-wheel'</span>, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'bottomRight'</span>, }).<span class="hljs-title function_">clone</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'bottom-left-wheel'</span>, <span class="hljs-attr">pivotCorner</span>: <span class="hljs-string">'bottomLeft'</span>, }); scrawl.<span class="hljs-title function_">makePicture</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'myFlower'</span>, <span class="hljs-attr">asset</span>: <span class="hljs-string">'iris'</span>, <span class="hljs-attr">copyStartX</span>: <span class="hljs-number">0</span>, <span class="hljs-attr">copyStartY</span>: <span class="hljs-number">0</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">visibility</span>: <span class="hljs-literal">false</span>, }); scrawl.<span class="hljs-title function_">makeLoom</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'display-loom'</span>, <span class="hljs-attr">fromPath</span>: <span class="hljs-string">'left-line'</span>, <span class="hljs-attr">toPath</span>: <span class="hljs-string">'right-line'</span>, <span class="hljs-attr">source</span>: <span class="hljs-string">'myFlower'</span>, <span class="hljs-attr">method</span>: <span class="hljs-string">'fill'</span>, <span class="hljs-attr">fromPathEnd</span>: <span class="hljs-number">0.95</span>, <span class="hljs-attr">delta</span>: { <span class="hljs-attr">fromPathStart</span>: <span class="hljs-number">0.0015</span>, <span class="hljs-attr">fromPathEnd</span>: <span class="hljs-number">0.0015</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="user-interaction">User interaction</h4> <p>Function to check whether mouse cursor is over stack, and lock the element artefact accordingly</p> </div> </li> <li id="section-9"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-9">§</a> </div> <p>A group to help manage pin drag-and-drop functionality</p> <ul> <li>KNOWN BUG - the element is not draggable on first user mousedown, but is draggable afterwards</li> </ul> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeGroup</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'draggable-artefacts'</span>, }).<span class="hljs-title function_">addArtefacts</span>(element); scrawl.<span class="hljs-title function_">makeDragZone</span>({ <span class="hljs-attr">zone</span>: stack, <span class="hljs-attr">collisionGroup</span>: <span class="hljs-string">'draggable-artefacts'</span>, <span class="hljs-attr">endOn</span>: [<span class="hljs-string">'up'</span>, <span class="hljs-string">'leave'</span>], <span class="hljs-attr">preventTouchDefaultWhenDragging</span>: <span class="hljs-literal">true</span>, });</pre></div></div> </li> <li id="section-10"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-10">§</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-11"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-11">§</a> </div> <p>Create the Display cycle animation</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeRender</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation-stack'</span>, <span class="hljs-attr">target</span>: stack, <span class="hljs-attr">afterShow</span>: report,</pre></div></div> </li> <li id="section-12"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-12">§</a> </div> <p>Fixes element misplacement issue on scene creation - see Demo <a href="./dom-007.html">DOM-007</a> for more details of the fix</p> </div> <div class="content"><div class='highlight'><pre> <span class="hljs-attr">afterCreated</span>: <span class="hljs-function">() =></span> stack.<span class="hljs-title function_">set</span>({ <span class="hljs-attr">height</span>: <span class="hljs-number">400</span> }), });</pre></div></div> </li> <li id="section-13"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-13">§</a> </div> <p>We can have more than one Display cycle animation on a web page</p> </div> <div class="content"><div class='highlight'><pre>scrawl.<span class="hljs-title function_">makeRender</span>({ <span class="hljs-attr">name</span>: <span class="hljs-string">'demo-animation-canvas'</span>, <span class="hljs-attr">target</span>: canvas, });</pre></div></div> </li> <li id="section-14"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-14">§</a> </div> <h4 id="more-user-interaction">More 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>: element, <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">width</span>: [<span class="hljs-string">'width'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">height</span>: [<span class="hljs-string">'height'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">handle_xAbsolute</span>: [<span class="hljs-string">'handleX'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">handle_yAbsolute</span>: [<span class="hljs-string">'handleY'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">offset_xAbsolute</span>: [<span class="hljs-string">'offsetX'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">offset_yAbsolute</span>: [<span class="hljs-string">'offsetY'</span>, <span class="hljs-string">'round'</span>], <span class="hljs-attr">roll</span>: [<span class="hljs-string">'roll'</span>, <span class="hljs-string">'float'</span>], <span class="hljs-attr">pitch</span>: [<span class="hljs-string">'pitch'</span>, <span class="hljs-string">'float'</span>], <span class="hljs-attr">yaw</span>: [<span class="hljs-string">'yaw'</span>, <span class="hljs-string">'float'</span>], <span class="hljs-attr">scale</span>: [<span class="hljs-string">'scale'</span>, <span class="hljs-string">'float'</span>], }, });</pre></div></div> </li> <li id="section-15"> <div class="annotation"> <div class="sswrap "> <a class="ss" href="#section-15">§</a> </div> <p>Setup form @ts-expect-error</p> </div> <div class="content"><div class='highlight'><pre><span class="hljs-variable languag