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You can define a "modifier" function for almost any property; this modifier intercepts the value that GSAP would normally apply on each update ("tick"), feeds it to your function as the first parameter and lets you run custom logic, returning a new value that GSAP should then apply. This is perfect for tasks like snapping, clamping, wrapping, or other dynamic effects. It's completely up to you! Parameters: value, target The modifier functions are passed two parameters: value (number | string) - The about-to-be-applied value from the regular tween. This is often a number, but could be a string based on whatever the property requires. For example if you're animating the x property, it would be a number, but if you're animating the left property it could be something like "212px", or for the boxShadow property it could be "10px 5px 10px rgb(255,0,0)". target (object) - The target itself. For example, change the x of one object based on the y of another object or change rotation based on the direction it is moving. Below are some examples that will help you get familiarized with the syntax. Snap rotation The tween below animates 360 degrees but the modifier function forces the value to jump to the closest 45-degree increment. Take note how the modifier function gets passed the value of the property that is being modified, in this case a rotation number. This is a good example of the ModifiersPlugin, but as of GSAP 3 you should probably be using GSAP's SnapPlugin for this sort of thing: Clamp with Modulus The tween below animates x to 500 but the modifier function forces the value to wrap so that it's always between 0 and 100. This is a good example of the ModifiersPlugin, but as of GSAP 3 you should probably be using GSAP's SnapPlugin for this sort of thing: Carousel Wrap Have you ever built a carousel and wrestled with making it loop seamlessly? Perhaps you duplicated each asset or wrote some code that moved each item back to the beginning when it reached the end. With ModifiersPlugin you can get a seamless repeating carousel with a single tween! The example below tweens each box to a relative x position of "+=500". Click the "show overflow" button to see each box get reset to x:0 when it goes beyond 500... Advanced demos We've only scratched the surface of what ModifiersPlugin can do. Our moderator Blake Bowen has been putting this new plugin to the test and has an impressive collection of demos that will surely inspire you. View the docs for ModifiersPlugin.

API MorphSVGPlugin needs to know what shape to morph to (and optionally which shapeIndex to use). When only specifying a shape, MorphSVGPlugin can take a wide range of values. Selector string gsap.to("#circle", {morphSVG:"#hippo", duration: 1}); An SVG element var endShape = document.getElementById("hippo"); gsap.to("#circle", {morphSVG: endShape, duration: 1}); Points for <polyline> or <polygon> elements: gsap.to(“#polygon”, {morphSVG:"240,220 240,70 70,70 70,220", duration: 2}); Strings for <path> elements gsap.to(“#path”, {morphSVG:"M10 315 L 110 215 A 30 50 0 0 1 162.55 162.45 L 172.55 152.45 A 30 50 -45 0 1 215.1 109.9 L 315 10", duration: 2}); *Note: if the shape you pass in is a <rect>, <circle>, <ellipse> (or similar), MorphSVGPlugin will internally create path data from those shapes. shapeIndex The shapeIndex property allows you to adjust how the points in the start shape are mapped. In order to prevent points from drifting wildly during the animation MorphSVGPlugin needs to find a point in the start path that is in close proximity to the first point in the end path. Once that point is found it will map the next point in the start path to the second point in the end path (and so on and so on). Due to the complexity of vector art there will be times that you may want to change which point in the start path gets mapped to the first point in the end path. This is where shapeIndex comes in. In order to specify the shapeIndex you need to use an object {} with shape and shapeIndex properties. The following code will map the third point in the square to the first point in the star. gsap.to("#square", {morphSVG: {shape: "#star", shapeIndex: 3, duration: 2}}); findShapeIndex() utility Experimenting with shapeIndex can be a bit of a guessing game. To make things easier we have created a stand-alone utility function called findShapeIndex(). This function provides an interactive user interface to help you visualize where the start point is, change it and preview the animation. You can load findShapeIndex() from: https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/findShapeIndex.js Once its loaded you simply tell it which shapes to use. findShapeIndex("#square", "#star"); Or pass in raw data: findShapeIndex("#square", "M10 315 L 110 215 A 30 50 0 0 1 162.55 162.45 L 172.55 152.45 A 30 50 -45 0 1 215.1 109.9 L 315 10"); The best way to get started is to drop your SVG into the pen above and alter the IDs to match your svg. Be sure to watch the video above which clearly illustrates how shapeIndex and findShapeIndex() work. Additional Notes shapeIndex only works on closed paths. if you supply a negative shapeIndex the start path will be completely reversed (which can be quite useful). Converting SVG shapes to paths Technically it’s only feasible to morph <path> elements or <polyline>/<polygon> elements, but what if you want to morph a <circle> or <rect> or <ellipse> or <line>? No problem - just tap into the utility method and have the plugin do the conversion for you: MorphSVGPlugin.convertToPath("#elementID"); You can pass in an element or selector text, so you could also have it convert ALL of those elements with one line: MorphSVGPlugin.convertToPath("circle, rect, ellipse, line, polygon, polyline"); This literally swaps in a for each one directly in the DOM, and it should look absolutely identical. It’ll keep the attributes, like the “id” attribute. So after the conversion, you should be able to target the elements pretty easily, just as you would before. <!-- An svg Like this: --> <rect id="endShape" width="100" height="100" fill="red"/> <!-- becomes --> <path id="endShape" fill="red" d="M100,0 v100 h-100 v-100 h100z"></path> Rotational Morphs? Canvas? Documentation View the official docs here for a full breakdown of the API. To learn how to include MorphSVGPlugin into your project, see the GSAP install docs. Demos MorphSVG Showcase MorphSVG How-To Demos Get your hands on MorphSVGPlugin MorphSVGPlugin is a bonus plugin for Club GreenSock members ("Shockingly Green" and "Business Green" levels). It's our way of showing our gratitude to those who are fueling innovation at GreenSock. To download MorphSVGPlugin, just log into your account dashboard and grab the latest version of GSAP. Try MorphSVGPlugin for free on CodePen! There's a special [fully-functional] version of MorphSVGPlugin that we link to in our demos in our MorphSVGPlugin Collection on CodePen, so feel free to fork any of them, add your own SVG graphics, and take MorphSVGPlugin for a spin. CodePen is a fantastic way to experiment. We highly recommend it. Note: the special version of the plugin will only work on the CodePen domain. To find out more about the many benefits of being a Club GreenSock member swing on by the club page and be sure to check out the other premium plugins.