javascript
/
tentone.escher.js
огледало од https://github.com/tentone/escher.js.git


			
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    <title>JSDoc: Source: stencil/BoxStencil.js</title>

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

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

import {Stencil} from "./Stencil.js";
import {Vector2} from "../math/Vector2.js";
import {Box2} from "../math/Box2.js";

/**
 * Box stencil can be used to clear a box mask region.
 *
 * It will limit the drwaing region to this box.
 *
 * @class
 * @extends {Stencil}
 */
function BoxStencil()
{
	Stencil.call(this);

	/**
	 * Box object containing the size of the object.
	 */
	this.box = new Box2(new Vector2(-50, -35), new Vector2(50, 35));

	/**
	 * If inverted the stencil considers the outside of the box instead of the inside.
	 */
	this.invert = false;
}

BoxStencil.prototype = Object.create(Stencil.prototype);

BoxStencil.prototype.clip = function(context, viewport, canvas)
{
	context.beginPath();
	
	var width = this.box.max.x - this.box.min.x;
	
	if(this.invert)
	{	
		context.rect(this.box.min.x - 1e4, -5e3, 1e4, 1e4);
		context.rect(this.box.max.x, -5e3, 1e4, 1e4);
		context.rect(this.box.min.x, this.box.min.y - 1e4, width, 1e4);
		context.rect(this.box.min.x, this.box.max.y, width, 1e4);
	}
	else
	{
		var height = this.box.max.y - this.box.min.y;
		context.fillRect(this.box.min.x, this.box.min.y, width, height);
	}

	context.clip();
};
</code></pre>
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