fabric.js/src/triangle.class.js

(function(global) {
  
  "use strict";
  
  var fabric = global.fabric || (global.fabric = { });
  
  if (fabric.Triangle) {
    fabric.warn('fabric.Triangle is already defined');
    return;
  }
  
  /** 
   * @class Triangle
   * @extends fabric.Object
   */
  fabric.Triangle = fabric.util.createClass(fabric.Object, /** @scope fabric.Triangle.prototype */ {
    
    /**
     * @property
     * @type String
     */
    type: 'triangle',
    
    /**
     * Constructor
     * @method initialize
     * @param options {Object} options object
     * @return {Object} thisArg
     */
    initialize: function(options) {
      options = options || { };
      
      this.callSuper('initialize', options);
      
      this.set('width', options.width || 100)
          .set('height', options.height || 100);
    },
    
    /**
     * @private
     * @method _render
     * @param ctx {CanvasRenderingContext2D} Context to render on
     */
    _render: function(ctx) {      
      var widthBy2 = this.width / 2,
          heightBy2 = this.height / 2;
      
      ctx.beginPath();
      ctx.moveTo(-widthBy2, heightBy2);
      ctx.lineTo(0, -heightBy2);
      ctx.lineTo(widthBy2, heightBy2);
      ctx.closePath();
      
      if (this.fill) {
        ctx.fill();
      }
      if (this.stroke) {
        ctx.stroke();
      }
    },
    
    /**
     * Returns complexity of an instance
     * @method complexity
     * @return {Number} complexity of this instance
     */
    complexity: function() {
      return 1;
    },
    
    /**
     * Returns svg representation of an instance
     * @method toSVG
     * @return {string} svg representation of an instance
     */
    toSVG: function() {

      var widthBy2 = this.width / 2,
          heightBy2 = this.height / 2;

      var points = [
        -widthBy2 + " " + heightBy2,
        "0 " + -heightBy2,
        widthBy2 + " " + heightBy2
      ].join(",");

      return '<polygon ' +
              'points="' + points + '" ' +
              'style="' + this.getSvgStyles() + '" ' +
              'transform="' + this.getSvgTransform() + '" ' +
              '/>';
    }
  });
  
  /**
   * Returns fabric.Triangle instance from an object representation
   * @static
   * @method Canvas.Trangle.fromObject
   * @param object {Object} object to create an instance from
   * @return {Object} instance of Canvas.Triangle
   */
  fabric.Triangle.fromObject = function(object) {
    return new fabric.Triangle(object);
  };

})(typeof exports != 'undefined' ? exports : this);