javascript
/
tentone.escher.js
mirror of https://github.com/tentone/escher.js.git


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JSDoc: Source: Renderer.js</title>

    <script src="scripts/prettify/prettify.js"> </script>
    <script src="scripts/prettify/lang-css.js"> </script>
    <!--[if lt IE 9]>
      <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
    <![endif]-->
    <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
    <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>

<body>

<div id="main">

    <h1 class="page-title">Source: Renderer.js</h1>

    
    <section>
        <article>
            <pre class="prettyprint source linenums"><code>"use strict";

import {Pointer} from "./input/Pointer.js";
import {ViewportControls} from "./controls/ViewportControls.js";

/**
 * The renderer is resposible for drawing the structure into the canvas element.
 *
 * Its also resposible for managing the canvas state.
 *
 * @class
 * @param {DOM} canvas Canvas to render the content.
 * @param {Object} options Renderer canvas options.
 */
function Renderer(canvas, options)
{
	if(options === undefined)
	{
		options = 
		{
			alpha: true
		};
	}

	/**
	 * Canvas DOM element, has to be managed by the user.
	 */
	this.canvas = canvas;

	/**
	 * Canvas 2D rendering context used to draw content.
	 */
	this.context = canvas.getContext("2d", {alpha: options.alpha});
	this.context.imageSmoothingEnabled = true;
	this.context.globalCompositeOperation = "source-over";

	/**
	 * Pointer input handler object.
	 */
	this.pointer = new Pointer(window, canvas);

	/**
	 * Indicates if the canvas should be automatically cleared on each new frame.
	 */
	this.autoClear = true;
}

/**
 * Creates a infinite render loop to render the group into a viewport each frame.
 *
 * The render loop cannot be destroyed, and it automatically creates a viewport controls object.
 *
 * @param {Object2D} group Group to be rendererd.
 * @param {Viewport} viewport Viewport into the objects.
 * @param {Function} onUpdate Function called before rendering the frame.
 */
Renderer.prototype.createRenderLoop = function(group, viewport, onUpdate)
{
	var self = this;
	
	var controls = new ViewportControls(viewport);

	function loop()
	{
		if(onUpdate !== undefined)
		{
			onUpdate();
		}

		controls.update(self.pointer);
		self.update(group, viewport);
		requestAnimationFrame(loop);
	}

	loop();
};

/**
 * Update the renderer state, update the input handlers, calculate the object and viewport transformation matrices.
 *
 * Render the object using the viewport into a canvas element.
 *
 * The canvas state is saved and restored for each individual object, ensuring that the code of one object does not affect another one.
 *
 * Should be called at a fixed rate preferably using the requestAnimationFrame() method, its also possible to use the createRenderLoop() method, that automatically creates a infinite render loop.
 *
 * @param object {Object2D} Object to be updated and drawn into the canvas, the Object2D should be used as a group to store all the other objects to be updated and drawn.
 * @param viewport {Viewport} Viewport to be updated (should be the one where the objects will be rendered after).
 */
Renderer.prototype.update = function(object, viewport)
{
	// Get objects to be rendered
	var objects = []
	object.traverse(function(child)
	{
		if(child.visible)
		{
			objects.push(child);
		}
	});

	// Sort objects by layer
	objects.sort(function(a, b)
	{
		if(b.layer === a.layer)
		{
			return b.level - a.level;
		}
		
		return b.layer - a.layer;
	});

	// Pointer object update
	var pointer = this.pointer;
	pointer.update();

	// Viewport transform matrix
	viewport.updateMatrix();

	// Project pointer coordinates
	var point = pointer.position.clone();
	var viewportPoint = viewport.inverseMatrix.transformPoint(point);

	// Object pointer events
	for(var i = 0; i &lt; objects.length; i++)
	{
		var child = objects[i];
		
		//Process the
		if(child.pointerEvents)
		{
			var childPoint = child.inverseGlobalMatrix.transformPoint(child.ignoreViewport ? point : viewportPoint);

			// Check if the pointer pointer is inside
			if(child.isInside(childPoint))
			{
				// Pointer enter
				if(!child.pointerInside &amp;&amp; child.onPointerEnter !== null)
				{			
					child.onPointerEnter(pointer, viewport);
				}

				// Pointer over
				if(child.onPointerOver !== null)
				{
					child.onPointerOver(pointer, viewport);
				}

				// Double click
				if(pointer.buttonDoubleClicked(Pointer.LEFT) &amp;&amp; child.onDoubleClick !== null)
				{
					child.onDoubleClick(pointer, viewport);
				}

				// Pointer pressed
				if(pointer.buttonPressed(Pointer.LEFT) &amp;&amp; child.onButtonPressed !== null)
				{	
					child.onButtonPressed(pointer, viewport);
				}

				// Just released
				if(pointer.buttonJustReleased(Pointer.LEFT) &amp;&amp; child.onButtonUp !== null)
				{	
					child.onButtonUp(pointer, viewport);
				}

				// Pointer just pressed
				if(pointer.buttonJustPressed(Pointer.LEFT))
				{
					if(child.onButtonDown !== null)
					{
						child.onButtonDown(pointer, viewport);
					}

					// Drag object and break to only start a drag operation on the top element.
					if(child.draggable)
					{
						child.beingDragged = true;
						break;
					}
				}

				child.pointerInside = true;
			}
			else if(child.pointerInside)
			{
				// Pointer leave
				if(child.onPointerLeave !== null)
				{
					child.onPointerLeave(pointer, viewport);
				}

				child.pointerInside = false;
			}

			// Stop object drag
			if(pointer.buttonJustReleased(Pointer.LEFT))
			{	
				if(child.draggable)
				{
					child.beingDragged = false;
				}
			}
		}
	}

	// Object drag events and update logic
	for(var i = 0; i &lt; objects.length; i++)
	{
		var child = objects[i];

		// Pointer drag event
		if(child.beingDragged)
		{	
			var lastPosition = pointer.position.clone();
			lastPosition.sub(pointer.delta);

			var positionWorld = viewport.inverseMatrix.transformPoint(pointer.position);
			var lastWorld = viewport.inverseMatrix.transformPoint(lastPosition);

			// Mouse delta in world coordinates
			positionWorld.sub(lastWorld);

			if(child.onPointerDrag !== null)
			{
				child.onPointerDrag(pointer, viewport, positionWorld);
			}
		}

		// On update
		if(child.onUpdate !== null)
		{
			child.onUpdate();
		}
	}

	// Update transformation matrices
	object.traverse(function(child)
	{
		child.updateMatrix();
	});

	this.context.setTransform(1, 0, 0, 1, 0, 0);
	
	// Clear canvas content
	if(this.autoClear)
	{
		this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
	}

	// Render into the canvas
	for(var i = objects.length - 1; i >= 0; i--)
	{	
		if(objects[i].isMask)
		{
			continue;
		}

		if(objects[i].saveContextState)
		{
			this.context.save();
		}

		// Apply all masks
		var masks = objects[i].masks;
		for(var j = 0; j &lt; masks.length; j++)
		{
			if(!masks[j].ignoreViewport)
			{
				viewport.matrix.setContextTransform(this.context);
			}

			masks[j].transform(this.context, viewport, this.canvas);
			masks[j].clip(this.context, viewport, this.canvas);
		}

		// Set the viewport transform
		if(!objects[i].ignoreViewport)
		{
			viewport.matrix.setContextTransform(this.context);
		}
		else if(masks.length > 0)
		{
			this.context.setTransform(1, 0, 0, 1, 0, 0);
		}

		// Apply the object transform to the canvas context
		objects[i].transform(this.context, viewport, this.canvas);
		objects[i].draw(this.context, viewport, this.canvas);

		if(objects[i].restoreContextState)
		{
			this.context.restore();
		}
	}
};

export {Renderer};
</code></pre>
        </article>
    </section>


</div>

<nav>
    <h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="BezierCurve.html">BezierCurve</a></li><li><a href="Box.html">Box</a></li><li><a href="Box2.html">Box2</a></li><li><a href="BoxMask.html">BoxMask</a></li><li><a href="Circle.html">Circle</a></li><li><a href="DOM.html">DOM</a></li><li><a href="EventManager.html">EventManager</a></li><li><a href="Graph.html">Graph</a></li><li><a href="Helpers.html">Helpers</a></li><li><a href="Image.html">Image</a></li><li><a href="Key.html">Key</a></li><li><a href="Line.html">Line</a></li><li><a href="Mask.html">Mask</a></li><li><a href="Matrix.html">Matrix</a></li><li><a href="Object2D.html">Object2D</a></li><li><a href="Pattern.html">Pattern</a></li><li><a href="Pointer.html">Pointer</a></li><li><a href="Renderer.html">Renderer</a></li><li><a href="Text.html">Text</a></li><li><a href="UUID.html">UUID</a></li><li><a href="Vector2.html">Vector2</a></li><li><a href="Viewport.html">Viewport</a></li><li><a href="ViewportControls.html">ViewportControls</a></li></ul>
</nav>

<br class="clear">

<footer>
    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.2</a> on Tue Jun 25 2019 14:27:21 GMT+0100 (Western European Summer Time)
</footer>

<script> prettyPrint(); </script>
<script src="scripts/linenumber.js"> </script>
</body>
</html>