Tweener for CraftyJS

A CraftyJS component to animate 2D properties with easing effects, inspired by Tweener Class for ActionScript/Flash platform. The easing equations are based on Robert Penner's original easing equations, with terms of use properly included on the uncompressed code. It doesn't conflict with Crafty's Tween core component.

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##Available Transitions The available easing transitions are:

• Linear ('linear')
• Quadratic ('easeInQuad', 'easeOutQuad', 'easeInOutQuad')
• Cubic ('easeInCubic', 'easeOutCubic', 'easeInOutCubic')
• Quartic ('easeInQuart', 'easeOutQuart', 'easeInOutQuart')
• Quintic ('easeInQuint', 'easeOutQuint', 'easeInOutQuint')
• Sinusoidal ('easeInSine', 'easeOutSine', 'easeInOutSine')
• Exponential ('easeInExpo', 'easeOutExpo', 'easeInOutExpo')
• Circular ('easeInCirc', 'easeOutCirc', 'easeInOutCirc')
• Elastic ('easeInElastic', 'easeOutElastic', 'easeInOutElastic')
• Back ('easeInBack', 'easeOutBack', 'easeInOutBack')
• Bounce ('easeInBounce', 'easeOutBounce', 'easeInOutBounce')

##Using Tweener The CraftyJS Tweener is called by an entity with the method .addTween:

.addTween(Object properties[, String transition[, Number duration[, Function onComplete[, Array onCompleteParams]]]])

Where:

• properties: object of 2D properties and what they should animate to
• easing effect to be applied to the animation. If not specified, the default is "easeOutExpo"
• duration: duration to animate the properties over (in frames). If not specified, the default is 50 frames (1 second)
• onComplete: callback function to be executed after tween is finished
• onCompleteParams: comma-delimited array of params to be executed by the callback function

This method will animate a 2D entities properties over the specified duration. These include 'x', 'y', 'w', 'h', 'alpha' and 'rotation'. It's also possible to set multiple tweens.

##Examples

Crafty.modules({ Tweener: 'DEV' }, function () {
    
    // Move an object to 100,100 with bounce transition in 200 frames.
    Crafty.e("2D, Tweener")
	.attr({x: 0, y: 0})
	.addTween({x: 100, y: 100}, 'easeOutBounce', 200)
	
	// Move an object to 650 on x-axis and 1080 degrees on rotation with quadratic transition in 100 frames and
	// 500 on y-axis with bounce transition in 200 frames.
	Crafty.e("2D, Tweener")
		.attr({x: 10, y: 75})
		.addTween({x:650, rotation: 1080}, 'easeInQuad',100);
		.addTween({y:500}, 'easeOutBounce',200);
	   
	// Passing a callback function to be executed on tween end
	Crafty.e("2D, Tweener")
		.attr({x: 0, y: 0})
		.addTween({x: 100, y: 100}, 'easeOutBounce', 200, func)
	
	Crafty.e("2D, Tweener")
	.attr({x: 50, y: 50})
	.addTween({x: 150, y: 150}, 'easeOutBounce', 300, func, ["Passing parameters to callback!"])
	
	function func(message) {
		if (message != undefined) {
			alert(message);
		} else {
			alert("Callback function without parameters");
		}
	}
});