ObjectiveCanvas.js
To use <canvas> in an objective way.
What's ObjectiveCanvas.js ?
It defines some constructors which you can use to create objects and draw them on <canvas>.
Some constructors:
- OC.Object
- OC.Shape
- OC.Rect
- OC.RoundRect
- OC.Circle
- OC.Arc
- OC.Star
- OC.Text
- OC.Line
- OC.Polygon
- OC.Sprite
- OC.TextGroup
How to use them ?
- Get an instance
- Set properties (position, transform, color, shadow, clip...)
- Draw it on <canvas>
Example:
<!DOCTYPE html>
<html>
<head>
<title>ObjectiveCanvas.js</title>
<!-- Load OC(.min).js -->
<script src="OC.min.js"></script>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var canvas = document.querySelector('#canvas'),
ctx = canvas.getContext('2d'),
circle = new OC.Circle(); // create a circle
/* set position */
circle.setX(100);
circle.setY(100);
// equals to circle.setPos(100, 100);
/* set color */
circle.setFillStyle('#ff0');
circle.setStrokeStyle('#f00');
/* draw */
circle.draw(ctx);
// You can also set OC.defaultContext
// and just write: xxx.draw();
</script>
</body>
</html>OC.Object.prototype.set(obj)
You can use this method to set properties of an object by giving an object.
Example:
circle.set({
lineWidth: 2,
shadowColor: 'rgba(0,0,0,.5)',
shadowBlur: 10
});OC.parse(str)
This method enable you to get canvas objects from json strings.
Example:
var rect = OC.parse('{ "constructor": "Rect", "x": 100, "y": 100, "w": 200, "h": 200, "fillStyle": "#00f" }');Try it !
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