animatePaper.js

An animation library for paper.js.

See a live demo on jsbin.

TypeScript

TypeScript declarations are available as of 1.2.1, in dist/src/animatePaper.d.ts.

Changelog from 0.x to 1.x (details)

• paper is now a peerDependency, this should remove unnecessary code from your dependency tree.
• The segmentGrow property and grow effect have been removed (this feature was very buggy).
• When using rotate or scale properties, you can provide a new setting : center (or rotateCenter/scaleCenter) (default is item.position).
• Animation supports a new option repeat (defaults to 0).
• settings.complete callback takes the Animationobject as 1st argument.
• Color support for paper.Group animation (1.1.*)
• rgb, gray, hsl, hbs Color formats are now supported (1.1.*)
• bug fix : negative absolute position supported (relative values must be of string type) (1.2.*)
• bug fix : allow 0 duration (1.2.*)
• custom easings : you can now pass a function (p: number) => number to settings.easing (1.2.*)

How to use :

npm and browserify

npm install --save paper-animate
then
import * as animatePaper from "paper-animate"; or var animatePaper = require("paper-animate")

bower

bower install paper-animate --save

directly in the browser

(not recommended)
Get the minified file in dist/paper-animate-browser.min.js, and include it in your page, after paper.js.

Features :

• Animation of multiple properties at the same time,
• easing,
• chaining

This is a work in progress, and any help or feedback is more than welcome.

So far, only opacity, position, scale, rotate, translate, fillColor and strokeColor are supported, but I add more whenever I have the time.

Animate an Item

(you can animate a Group too)

You can either use a predefined animation :

var myCircle = new paper.Path.Circle(new paper.Point(50,50),35);
animatePaper.fx.shake(myCircle);

Predefined animations available by default : shake, fadeIn, fadeOut, slideUp, slideDown, splash. You can try them on this demo.

Or animate properties :

var myCircle = new paper.Path.Circle(new paper.Point(50,50),35);
animatePaper.animate(myCircle, {
    properties: {
        translate: new paper.Point(100,50),
        scale: 3
    },
    settings: {
        duration: 4000,
        delay: 1000,
        easing: "easeInElastic",
        complete: function(item, animation) {
            console.log('complete !');
        }
    }
});

When animating position or color properties, you can provide either relative or absolute values :

var square = new paper.Path.Rectangle(new paper.Point(75, 75), new paper.Size(50,50));
square.strokeColor = 'green';
square.animate({
  properties: {
    position: {
      x: "+200", // relative to the current position of the item. At the end, `x` will be : 275
      y: 150     // absolute position. At the end, `y` will be : 150
    },
    strokeColor: {
      hue: "+100",
      brightness: "-0.4"
    }
  },
  settings: {
    duration:1500,
    easing:"easeInBounce"
  }
});

Note : Relative values must be strings.

Repeat

If you want your Animation to run more than once, you can use the settings.repeat option (defaults to 0).
If settings.repeat is a number > 0, your animation will run settings.repeat additional times.
If you set settings.repeat to true, the animation will repeat infinitely until you call animatePaper.stop(item, true, true) (the third parameter should be true, otherwise only the current Animation will be stopped).
If you set settings.repeat to a function, it will be called at the end of every "loop" and the Animation will repeat itself as long as settings.repeat returns true.
This feature works best with relative values (e.g. '+myVal' instead of myVal), if you repeat an animation with absolute values you won't get the desired result.

animatePaper.animate(item,{
    properties: {
      rotate: '+360'
    },
    settings: {
      center: new paper.Point(100, 50),
      duration: 2000,
      repeat: 2, // animation will run 3 times total
      easing: "linear"
    }
});
animatePaper.animate(item2,{
    properties: {
      rotate: '+360'
    },
    settings: {
      center: new paper.Point(100, 50),
      duration: 2000,
      repeat: true, // will loop until .stop() is called
      easing: "linear"
    }
});
setTimeout(function() {
  animatePaper.stop(item2, false, true);
}, 10000);

var c = 0;
animatePaper.animate(item3,{
    properties: {
      rotate: '+360'
    },
    settings: {
      center: new paper.Point(100, 50),
      duration: 2000,
      repeat: function(item, animation) { // will run until c >= 2
         c++;
         return (c < 2);
      },
      easing: "linear"
    }
});

The lib also extends Item.prototype with .animate() and .stop() methods, which means you can also use

myCircle.animate({
    /*
        Animation parameters ...
    */
});

If you want to perform multiple animations successively, you can provide an array of parameters objects :

var star = new paper.Path.Star(new paper.Point(45,50),5,25,45);
star.fillColor = "black";
star.opacity = 0;
star.animate([{
  properties: {
      translate: new paper.Point(200,50),
      rotate: -200,
      scale: 2,
      opacity:1
  },
  settings: {
      duration:3000,
      easing:"swing"
  }
},
{
  properties: {
      translate: new paper.Point(0,50),
      rotate: 200,
      scale: 1,
      opacity:0
  },
  settings: {
      duration:3000,
      easing:"swing"
  }
}]);

This is especially helpful when adding predefined animations to the library, it helps avoiding callback hell.

You can stop all running animations on an item by calling :

animatePaper.stop(star);
// or
star.stop();

The stop method can take a goToEnd argument. If true, all the animations will take their final value and complete callbacks will be called.

Easing

By default, the supported easing functions are : linear, swing, easeInSine, easeOutSine, easeInOutSine, easeInCirc, easeOutCirc, easeInOutCirc, easeInElastic, easeOutElastic, easeInOutElastic, easeInBack, easeOutBack, easeInOutBack, easeInBounce, easeOutBounce, easeInOutBounce, easeInQuad, easeOutQuad, easeInOutQuad, easeInCubic, easeOutCubic, easeInOutCubic, easeInQuart, easeOutQuart, easeInOutQuart, easeInQuint, easeOutQuint, easeInOutQuint, easeInExpo, easeOutExpo, easeInOutExpo.

If you want to use more easing functions, settings.easing can take a (p: number) => number function as a value, so that you can use your own or use some from an external library such as bezier-easing.

animatePaper.animate(item,{
    properties: {
      /** ... **/
    },
    settings: {
      /** ... **/
      easing: BezierEasing(0, 0, 1, 0.5)
    }
});

Alternatively, you can use the animatePaper.extendEasing(myEasingFunctions) method to add your own easing functions or override any existing easing.

The method takes only one argument : an object in which keys are easing names, and values are easing functions:

animatePaper.extendEasing({
    "triple": function(p) {
        return p*3;
    }
});

Learn more about easing here.

Extend property hooks

If you want to add support for a new property or override the library's behavior for properties that are already supported, you can use animatePaper.extendPropHooks(myPropHooks);.

myPropHooks should be an object in which keys are property names, and values are "hook objects".

Each "hook object" can have a get, set and ease method, and will be used to interface the animation with the property.

For example, say you want to add support for color animation:

animatePaper.extendPropHooks({
  "fillColor": {
    get: function(tween) {
      // my code ...
    },
    ease: function(tween,easedPercent) {
      // my code ...
    }
  }
});

When these functions are used, they are passed only one argument : the Tween object (see the doc in doc/ for more details), exept for the ease() function which gets the eased percent as second parameter.

• The get() function must return the current value of the Tween.item's property.
• The set() function must set the value of the Tween.item's property with Tween.now (which will most likely be the result of get() or ease())
• The ease() function must return the eased value. The second parameter is the eased percent.

Add your own animations to the lib

To do so, simply add properties to animatePaper.fx, like so :

animatePaper.fx.wave = function(item,settings) {
  var myAnimations = [...];
  item.animate(myAnimations);
};
animatePaper.fx.wave(myItem);

Contributing

• as of 1.2.1 the lib uses TypeScript, so make your changes in src/*.ts then build with gulp build-paper-animate and gulp build-paper-animate-browser.
• run unit tests with npm test.
• open tests/test.html in a browser to run integration tests.

TODOS

• Change how item.data._animatePaperVals works to allow multiple animations of the same property at the same time.
• Change Tween so that we garantee values are right at 0and 1 positions, to avoid problems with imprecise numbers (floating point). See "Negative position" in tests.js.
• Add tests

Help needed !

I'm a beginner in paper.js, so if you spot a mistake or want to add something to the lib, any help would be appreciated :-)

Author

camille dot hodoul at gmail dot com

Contributors

• User pueding for bug fixes and delay feature.
• Users s-light and StratusBase for feedback, ideas and contributions (Group Color support, bug fixes).

@Eartz_HC