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Fabric JS Arrow
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fabric.Arrow = fabric.util.createClass(fabric.Line, { | |
type: 'Arrow', | |
initialize: function(element, options) { | |
options || (options = {}); | |
this.callSuper('initialize', element, options); | |
}, | |
toObject: function() { | |
return fabric.util.object.extend(this.callSuper('toObject')); | |
}, | |
_render: function(ctx){ | |
this.callSuper('_render', ctx); | |
// do not render if width/height are zeros or object is not visible | |
if (this.width === 0 && this.height === 0 || !this.visible) return; | |
ctx.save(); | |
var xDiff = this.x2 - this.x1; | |
var yDiff = this.y2 - this.y1; | |
var angle = Math.atan2(yDiff, xDiff); | |
ctx.translate((this.x2 - this.x1) / 2, (this.y2 - this.y1) / 2); | |
ctx.rotate(angle); | |
ctx.beginPath(); | |
//move 10px in front of line to start the arrow so it does not have the square line end showing in front (0,0) | |
ctx.moveTo(10,0); | |
ctx.lineTo(-10, 10); | |
ctx.lineTo(-10, -10); | |
ctx.closePath(); | |
ctx.fillStyle = this.stroke; | |
ctx.fill(); | |
ctx.restore(); | |
}, | |
clipTo: function(ctx) { | |
this._render(ctx); | |
} | |
}); | |
fabric.Arrow.fromObject = function (object, callback) { | |
callback && callback(new fabric.Arrow([object.x1, object.y1, object.x2, object.y2],object)); | |
}; | |
fabric.Arrow.async = true; |
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