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Canvas Drawing Example
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/** @jsx React.DOM */ | |
var Graphic = React.createClass({ | |
componentDidMount: function() { | |
var context = this.getDOMNode().getContext('2d'); | |
this.paint(context); | |
}, | |
componentDidUpdate: function() { | |
var context = this.getDOMNode().getContext('2d'); | |
context.clearRect(0, 0, 200, 200); | |
this.paint(context); | |
}, | |
paint: function(context) { | |
context.save(); | |
context.translate(100, 100); | |
context.rotate(this.props.rotation, 100, 100); | |
context.fillStyle = '#F00'; | |
context.fillRect(-50, -50, 100, 100); | |
context.restore(); | |
}, | |
render: function() { | |
return <canvas width={200} height={200} />; | |
} | |
}); | |
var App = React.createClass({ | |
getInitialState: function() { | |
return { rotation: 0 }; | |
}, | |
componentDidMount: function() { | |
requestAnimationFrame(this.tick); | |
}, | |
tick: function() { | |
this.setState({ rotation: this.state.rotation + .01 }); | |
requestAnimationFrame(this.tick); | |
}, | |
render: function() { | |
return <div><Graphic rotation={this.state.rotation} /></div> | |
} | |
}); | |
React.renderComponent(<App />, document.body); |
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