CodePen Embed - MorphSVG: fixing type:"rotational" weirdness

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\\n  font-size: 20px;\\n  font-weight: 300;\\n  margin: 0;\\n  padding: 0;\\n}\\n\\nsvg {\\n  position: fixed;\\n  height: 80vh;\\n  width: 100vw;\\n  top: 0;\\n  left: 0;\\n  overflow: visible\\n}\\n\\n.dolphin {\\n  visibility: hidden;\\n}\\n\\n.bird {\\n  fill: #765e98;\\n}\\n\\ntext {\\n  fill: white;\\n  font-size: 20px;\\n}\\n\\n#instructions {\\n  position: fixed;\\n  bottom: 0;\\n  left: 0;\\n  right:0;\\n  text-align: center;\\n}\\np {\\n  color: #ccc;\\n  padding: 20px;\\n  max-width: 800px;\\n  margin-bottom: 0;\\n  text-align: left;\\n  display: inline-block;\\n}\\ncode {\\n  color: white;\\n  font-family: courier, monospace;\\n}\",\"js\":\"gsap.registerPlugin(MorphSVGPlugin, Draggable);\\ngsap.defaults({overwrite: \\\"auto\\\"});\\n\\nMorphSVGPlugin.convertToPath(\\\".bird\\\");\\n\\n// var tween = gsap.to(\\\".bird\\\", {\\n//   duration: 2, \\n//   morphSVG:{\\n//     shape: \\\".dolphin\\\", \\n//     //origin: \\\"42% 57%,38% 19%\\\",\\n//     type: \\\"rotational\\\"\\n//   }, \\n//   ease: \\\"power1.inOut\\\",\\n//   repeat: -1,\\n//   repeatDelay: 1,\\n//   yoyo: true,\\n//   delay: 3\\n// });\\n\\nfindMorphOrigin(\\\".bird\\\", \\\".dolphin\\\", {showLines:true});\\n\\n\\n/*\\nThis function helps visualize the morph's origin (only for type:\\\"rotational\\\" morphs).\\nSimply pass in the the two targets (the starting SVG element and ending SVG element)\\nand it'll morph them, adding a red circle to show the origin. You can drag it around and once\\nyou release it, you'll see the animation updated accordingly. If you drag it when the shape\\nis in its \\\"end\\\" state, it'll update the end origin. Drag in its \\\"start\\\" state and it'll\\nupdate the start origin.\\n\\nExample:\\nfindMorphOrigin(\\\".start\\\", \\\".end\\\", {showLines:true});\\n\\nOptionally pass in a vars object as the 3rd parameter with things like:\\n{showLines:true, scale:1.5, lineColor:\\\"white\\\", lineOpacity:0.5, lineWidth:1, origin:\\\"40% 20%\\\"}\\n\\nDraggable is required (you can load it from the CDN at https://cdnjs.cloudflare.com/ajax/libs/gsap/2.1.0/utils/Draggable.min.js)\\n*/\\nfunction findMorphOrigin(target1, target2, vars) {\\n\\tvars = vars || {};\\n\\tgsap.killTweensOf(target1, false, {morphSVG:true});\\n\\tvar _getElement = function(e) {\\n\\t\\t\\treturn (typeof(e) === \\\"string\\\") ? document.querySelector(e) : e;\\n\\t\\t},\\n\\t\\t_setDefaults = function(v, defaults) {\\n\\t\\t\\tv = v || {};\\n\\t\\t\\tfor (var p in defaults) {\\n\\t\\t\\t\\tif (!(p in v)) {\\n\\t\\t\\t\\t\\tv[p] = defaults[p];\\n\\t\\t\\t\\t}\\n\\t\\t\\t}\\n\\t\\t\\treturn v;\\n\\t\\t},\\n\\t\\t_createSVG = function(type, container, attributes) {\\n\\t\\t\\tvar element = document.createElementNS(\\\"http://www.w3.org/2000/svg\\\", type),\\n\\t\\t\\t\\treg = /([a-z])([A-Z])/g,\\n\\t\\t\\t\\tp;\\n\\t\\t\\tfor (p in attributes) {\\n\\t\\t\\t\\telement.setAttributeNS(null, p.replace(reg, \\\"$1-$2\\\").toLowerCase(), attributes[p]);\\n\\t\\t\\t}\\n\\t\\t\\tcontainer.appendChild(element);\\n\\t\\t\\treturn element;\\n\\t\\t},\\n\\t\\tediting = \\\"start\\\",\\n\\t\\tlines, startOrigin, endOrigin,\\n\\t\\t_createLines = function() {\\n\\t\\t\\tvar rawPath = startElement._gsRawPath,\\n\\t\\t\\t\\ti, j, segment, line;\\n\\t\\t\\tlines = [];\\n\\t\\t\\tfor (j = 0; j < rawPath.length; j++) {\\n\\t\\t\\t\\tsegment = rawPath[j];\\n\\t\\t\\t\\tfor (i = 0; i < segment.length; i+=6) {\\n\\t\\t\\t\\t\\tline = _createSVG(\\\"line\\\", startElement.ownerSVGElement, {stroke:v.lineColor, strokeWidth:v.lineWidth});\\n\\t\\t\\t\\t\\tline.style.opacity = v.lineOpacity;\\n\\t\\t\\t\\t\\tlines.push(line);\\n\\t\\t\\t\\t}\\n\\t\\t\\t\\tg.parentNode.appendChild(g);\\n\\t\\t\\t}\\n\\t\\t\\treturn lines;\\n\\t\\t},\\n\\t\\t_update = function(leaveOrigin) {\\n\\t\\t\\tvar rawPath = startElement._gsRawPath,\\n\\t\\t\\t\\tli = 0,\\n\\t\\t\\t\\tlocalToGlobal = globalG.getCTM().inverse().multiply(startElement.getCTM()),\\n\\t\\t\\t\\tglobalToLocal = localToGlobal.inverse(),\\n\\t\\t\\t\\to, j, i, sl, line, segment, ox, oy, x, y;\\n\\t\\t\\tif (rawPath && rawPath.origin) {\\n\\t\\t\\t\\tif (leaveOrigin === true) {\\n\\t\\t\\t\\t\\tox = gsap.getProperty(g, \\\"x\\\");\\n\\t\\t\\t\\t\\toy = gsap.getProperty(g, \\\"y\\\");\\n\\t\\t\\t\\t} else {\\n\\t\\t\\t\\t\\to = rawPath.origin;\\n\\t\\t\\t\\t\\tox = o.x * localToGlobal.a + o.y * localToGlobal.c + localToGlobal.e;\\n\\t\\t\\t\\t\\toy = o.x * localToGlobal.b + o.y * localToGlobal.d + localToGlobal.f;\\n\\t\\t\\t\\t\\tgsap.set(g, {x:ox, y:oy});\\n\\t\\t\\t\\t}\\n\\t\\t\\t\\tif (v.showLines) {\\n\\t\\t\\t\\t\\tif (!lines) {\\n\\t\\t\\t\\t\\t\\t_createLines();\\n\\t\\t\\t\\t\\t}\\n\\t\\t\\t\\t\\tfor (j = 0; j < rawPath.length; j++) {\\n\\t\\t\\t\\t\\t\\tsegment = rawPath[j];\\n\\t\\t\\t\\t\\t\\tsl = segment.length;\\n\\t\\t\\t\\t\\t\\tfor (i = 0; i < sl; i+=6) {\\n\\t\\t\\t\\t\\t\\t\\tline = lines[li++];\\n\\t\\t\\t\\t\\t\\t\\tline.setAttribute(\\\"x1\\\", ox);\\n\\t\\t\\t\\t\\t\\t\\tline.setAttribute(\\\"y1\\\", oy);\\n\\t\\t\\t\\t\\t\\t\\tline.setAttribute(\\\"x2\\\", segment[i] * localToGlobal.a + segment[i+1] * localToGlobal.c + localToGlobal.e);\\n\\t\\t\\t\\t\\t\\t\\tline.setAttribute(\\\"y2\\\", segment[i] * localToGlobal.b + segment[i+1] * localToGlobal.d + localToGlobal.f);\\n\\t\\t\\t\\t\\t\\t}\\n\\t\\t\\t\\t\\t}\\n\\t\\t\\t\\t}\\n\\t\\t\\t\\tif (leaveOrigin === true) {\\n\\t\\t\\t\\t\\tx = ((ox * globalToLocal.a + oy * globalToLocal.c + globalToLocal.e) - rawPath.left) / rawPath.width;\\n\\t\\t\\t\\t\\ty = ((ox * globalToLocal.c + oy * globalToLocal.d + globalToLocal.f) - rawPath.top) / rawPath.height;\\n\\t\\t\\t\\t\\tif (editing === \\\"start\\\") {\\n\\t\\t\\t\\t\\t\\tstartOrigin = Math.round(x * 100) + \\\"% \\\" + Math.round(y * 100) + \\\"%\\\";\\n\\t\\t\\t\\t\\t} else {\\n\\t\\t\\t\\t\\t\\tendOrigin = Math.round(x * 100) + \\\"% \\\" + Math.round(y * 100) + \\\"%\\\";\\n\\t\\t\\t\\t\\t}\\n\\t\\t\\t\\t\\tlabel.textContent = startOrigin + (endOrigin ? \\\", \\\" + endOrigin : \\\"\\\");\\n\\t\\t\\t\\t}\\n\\t\\t\\t}\\n\\t\\t},\\n\\t\\tstartElement = _getElement(target1),\\n\\t\\tv = _setDefaults(vars, {fill:\\\"#0ae448\\\", scale:1, origin:\\\"50% 50%\\\", lineColor:\\\"white\\\", lineWidth:0.5, lineOpacity:0.35, duration:2.25, ease:\\\"power1.inOut\\\", draggable:true}),\\n\\t\\tglobalG = _createSVG(\\\"g\\\", startElement.ownerSVGElement), //Firefox returns null for ownerSVGElement.getCTM(), so we need a dummy element\\n\\t\\tlabelG = _createSVG(\\\"g\\\", startElement.ownerSVGElement),\\n\\t\\trect = _createSVG(\\\"rect\\\", labelG, {width:120, height:17}),\\n\\t\\tlabel = _createSVG(\\\"text\\\", labelG, {textAnchor:\\\"middle\\\"}),\\n\\t\\tg = _createSVG(\\\"g\\\", startElement.ownerSVGElement),\\n\\t\\tclickArea = _createSVG(\\\"circle\\\", g, {r:20, style:\\\"fill:transparent\\\"}),\\n\\t\\torigin = _createSVG(\\\"circle\\\", g, {r:4, style:\\\"fill:\\\" + v.fill + \\\";stroke:\\\" + v.lineColor}),\\n\\t\\ttween = gsap.to(target1, {duration: v.duration, morphSVG:{shape:target2, type:\\\"rotational\\\", origin:v.origin, smoothTolerance:v.smoothTolerance}, onUpdate:_update, ease:v.ease}),\\n\\t\\tbbox = startElement.getBBox(),\\n\\t\\tglobalToLocal = globalG.getCTM().inverse().multiply(startElement.getCTM()).inverse(),\\n\\t\\tlocalToGlobal = globalG.getCTM().inverse().multiply(startElement.getCTM()),\\n\\t\\ttl = gsap.timeline({yoyo:true, repeat:-1, repeatDelay:1.25}),\\n\\t\\trawPath;\\n\\n\\tgsap.set(rect, {y:-17, x: -60, fill:\\\"black\\\", opacity:0.4});\\n\\tgsap.set(label, {y:-5, fontSize:10, fill:\\\"white\\\"});\\n\\tgsap.set([g, labelG], {scale:v.scale, svgOrigin:\\\"0 0\\\"});\\n\\tgsap.set(labelG, {x:bbox.x + bbox.width / 2 + localToGlobal.e, y:bbox.y + bbox.height + localToGlobal.f});\\n\\ttl.add(tween, 0)\\n\\t  .to(origin, {duration: v.duration, fill:\\\"#f1004c\\\", ease:\\\"steps(1)\\\"}, 0);\\n\\ttl.time(0.0001);\\n\\trawPath = startElement._gsRawPath;\\n\\tif (!rawPath || !rawPath.origin) {\\n\\t\\tthrow \\\"Please update to the latest MorphSVGPlugin\\\";\\n\\t}\\n\\tif (v.origin.indexOf(\\\",\\\") !== -1) {\\n\\t\\tendOrigin = v.origin.split(\\\",\\\")[1];\\n\\t}\\n\\t_update();\\n\\t_update(true);\\n\\tif (typeof(Draggable) !== \\\"undefined\\\") {\\n\\t\\tDraggable.create(g, {\\n\\t\\t\\tonPress:function() {\\n\\t\\t\\t\\tif (tl.pause().progress() < 0.5) {\\n\\t\\t\\t\\t\\tediting = \\\"start\\\";\\n\\t\\t\\t\\t\\ttl.progress(0.0001);\\n\\n\\t\\t\\t\\t} else {\\n\\t\\t\\t\\t\\tediting = \\\"end\\\";\\n\\t\\t\\t\\t\\ttl.progress(0.99999);\\n\\t\\t\\t\\t}\\n\\t\\t\\t\\tMorphSVGPlugin.getTotalSize(startElement._gsRawPath); //re-calculates the top/left/width/height and attaches those to the rawPath.\\n\\t\\t\\t\\tgsap.set(g, {x:this.x, y:this.y});\\n\\t\\t\\t\\t_update(true);\\n\\t\\t\\t},\\n\\t\\t\\tonDrag:function() {\\n\\t\\t\\t\\t_update(true);\\n\\t\\t\\t},\\n\\t\\t\\tonRelease:function() {\\n\\t\\t\\t\\tvar time = tl.time(); //globalToLocal = startElement.ownerSVGElement.getCTM().inverse().multiply(startElement.getCTM()).inverse()\\n\\t\\t\\t\\ttween.vars.morphSVG.origin = startOrigin + (endOrigin ? \\\",\\\" + endOrigin : \\\"\\\");\\n\\t\\t\\t\\ttl.totalTime(0).invalidate().play(time > 0.001 ? time + 1.25 : 0);\\n\\t\\t\\t}\\n\\t\\t});\\n\\t} else {\\n\\t\\tconsole.log(\\\"Please load Draggable for findMorphOrigin() to work.\\\")\\n\\t}\\n\\treturn tl;\\n}\",\"html_pre_processor\":\"none\",\"css_pre_processor\":\"none\",\"js_pre_processor\":\"none\",\"html_classes\":\"\",\"css_starter\":\"neither\",\"js_library\":null,\"created_at\":\"2019-01-16T06:05:11.000Z\",\"updated_at\":\"2023-08-11T15:46:12.659Z\",\"title\":\"MorphSVG: fixing type:\\\"rotational\\\" weirdness\",\"description\":\"Sometimes when you set MorphSVG's type to \\\"rotational\\\", you get odd results due to where certain points line up with the origin. 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