如何更改制作动态饼图的状态？ [英] How to change states for making dynamic pie chart?
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问题描述
我正在尝试制作一个动态饼图，它会随着滑块的变化而变化。
我已经设置了一切但我不能在其中引入状态，因为我是新手做出反应。我只是希望当有人滑动滑块时，饼图也会根据滑块的值而变化。任何人都可以帮助我吗？
I am trying to make a dynamic pie chart, which changes on change of slider. I have setup everything But i'am not able to introduce states in it as I am new to react. I just want that when someone slides slider, the pie chart also changes according to value of slider. Can anyone help me?
<!DOCTYPE html>
<html>
<head>
<title>React Example without Babel </title>
<script src="https://npmcdn.com/react@15.3.1/dist/react.min.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.1/dist/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.0-alpha1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react-with-addons.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<link href="http://getbootstrap.com/dist/css/bootstrap.css" rel="stylesheet">
<style>
.pie{
fill:red;
}
</style>
</head>
<body>
<div class="container">
<div id="app"></div>
<div class="col-lg-5" id="slider"></div>
<div class="col-lg-6" id="pie_chart"></div>
</div>
<script type="text/jsx">
class Header extends React.Component{
render(){
return (<div><h1 className='page-header'>{this.props.text}</h1></div>);
}
}
ReactDOM.render(<Header text='Dynamic Pie Chart'/>,document.getElementById('app'));
class Slider extends React.Component{
render(){
return (<div><input type='range' min='1' max='100' /></div>);
}
}
ReactDOM.render(<Slider />,document.getElementById('slider'));
var PropTypes = React.PropTypes;
var PieChart = React.createClass({
displayName: 'PieChart',
propTypes: {
className: PropTypes.string,
size: PropTypes.number,
slices: PropTypes.arrayOf(PropTypes.shape({
color: PropTypes.string.isRequired, // hex color
value: PropTypes.number.isRequired })).isRequired },
getDefaultProps: function getDefaultProps() {
return {
size: 200 };
},
_renderPaths: function _renderPaths() {
var radCircumference = Math.PI * 2;
var center = this.props.size / 2;
var radius = center - 1; // padding to prevent clipping
var total = this.props.slices.reduce(function (totalValue, slice) {
return totalValue + slice.value;
}, 0);
var radSegment = 0;
var lastX = radius;
var lastY = 0;
return this.props.slices.map(function (slice, index) {
var color = slice.color;
var value = slice.value;
// Should we just draw a circle?
if (value === total) {
return React.createElement('circle', {
r: radius,
cx: radius,
cy: radius,
fill: color,
key: index
});
}
if (value === 0) {
return;
}
var valuePercentage = value / total;
// Should the arc go the long way round?
var longArc = valuePercentage <= 0.5 ? 0 : 1;
radSegment += valuePercentage * radCircumference;
var nextX = Math.cos(radSegment) * radius;
var nextY = Math.sin(radSegment) * radius;
// d is a string that describes the path of the slice.
// The weirdly placed minus signs [eg, (-(lastY))] are due to the fact
// that our calculations are for a graph with positive Y values going up,
// but on the screen positive Y values go down.
var d = ['M ' + center + ',' + center, 'l ' + lastX + ',' + -lastY, 'a' + radius + ',' + radius, '0', '' + longArc + ',0', '' + (nextX - lastX) + ',' + -(nextY - lastY), 'z'].join(' ');
lastX = nextX;
lastY = nextY;
return React.createElement('path', { d: d, fill: color, key: index });
});
},
/**
* @return {Object}
*/
render: function render() {
var size = this.props.size;
var center = size / 2;
return React.createElement(
'svg',
{ viewBox: '0 0 ' + size + ' ' + size },
React.createElement(
'g',
{ transform: 'rotate(-90 ' + center + ' ' + center + ')' },
this._renderPaths()
)
);
}
});
var slices = [
{ color: '#468966', value: 180 },
{ color: '#FFF0A5', value: 180 },
];
ReactDOM.render(<PieChart slices={slices} />, document.getElementById('pie_chart'));
</script>
</body>
</html>
推荐答案
嗨请检查它现在正在运行的代码。您必须将幻灯片更改值传递给州。我改变了一些代码。请检查。
Hi Please check the code its working now. You have to pass your slide change value to the state. I have changed few code. Please check.
<!DOCTYPE html>
<html>
<head>
<title>React Example without Babel </title>
<script src="https://npmcdn.com/react@15.3.1/dist/react.min.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.1/dist/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.0-alpha1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react-with-addons.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<link href="http://getbootstrap.com/dist/css/bootstrap.css" rel="stylesheet">
<style>
.pie{
fill:red;
}
</style>
</head>
<body>
<div class="container">
<div id="app"></div>
<div class="col-lg-5" id="slider"></div>
<div class="col-lg-6" id="pie_chart"></div>
</div>
<script type="text/jsx">
class Header extends React.Component{
render(){
return (<div><h1 className='page-header'>{this.props.text}</h1></div>);
}
}
ReactDOM.render(<Header text='Dynamic Pie Chart'/>,document.getElementById('app'));
class Slider extends React.Component{
render(){
return (<div><input type='range' min='1' max='100' onChange = {this.props.sliderEvent} /></div>);
}
}
var PropTypes = React.PropTypes;
var PieChart = React.createClass({
displayName: 'PieChart',
propTypes: {
className: PropTypes.string,
size: PropTypes.number,
slices: PropTypes.arrayOf(PropTypes.shape({
color: PropTypes.string.isRequired, // hex color
value: PropTypes.number.isRequired })).isRequired },
getDefaultProps: function getDefaultProps() {
return {
size: 200 };
},
_renderPaths: function _renderPaths() {
var radCircumference = Math.PI * 2;
var center = this.props.size / 2;
var radius = center - 1; // padding to prevent clipping
var total = this.props.slices.reduce(function (totalValue, slice) {
return totalValue + slice.value;
}, 0);
var radSegment = 0;
var lastX = radius;
var lastY = 0;
return this.props.slices.map(function (slice, index) {
var color = slice.color;
var value = slice.value;
// Should we just draw a circle?
if (value === total) {
return React.createElement('circle', {
r: radius,
cx: radius,
cy: radius,
fill: color,
key: index
});
}
if (value === 0) {
return;
}
var valuePercentage = value / total;
// Should the arc go the long way round?
var longArc = valuePercentage <= 0.5 ? 0 : 1;
radSegment += valuePercentage * radCircumference;
var nextX = Math.cos(radSegment) * radius;
var nextY = Math.sin(radSegment) * radius;
// d is a string that describes the path of the slice.
// The weirdly placed minus signs [eg, (-(lastY))] are due to the fact
// that our calculations are for a graph with positive Y values going up,
// but on the screen positive Y values go down.
var d = ['M ' + center + ',' + center, 'l ' + lastX + ',' + -lastY, 'a' + radius + ',' + radius, '0', '' + longArc + ',0', '' + (nextX - lastX) + ',' + -(nextY - lastY), 'z'].join(' ');
lastX = nextX;
lastY = nextY;
return React.createElement('path', { d: d, fill: color, key: index });
});
},
/**
* @return {Object}
*/
render: function render() {
var size = this.props.size;
var center = size / 2;
return React.createElement(
'svg',
{ viewBox: '0 0 ' + size + ' ' + size },
React.createElement(
'g',
{ transform: 'rotate(-90 ' + center + ' ' + center + ')' },
this._renderPaths()
)
);
}
});
class App extends React.Component{
constructor(props){
super(props);
this.state = {
slices : [
{ color: '#468966', value: 180 },
{ color: '#FFF0A5', value: 180 },
]
};
//this.handleSliderEvent = this.bind.handleSliderEvent(this);
}
handleSliderEvent(e){
var slices1 = (360 * e.target.value)/100;
var slices2 = 360 - slices1;
var array1 = [
{ color: '#468966', value: slices1 },
{ color: '#FFF0A5', value: slices2 }
];
console.log(array1)
this.setState({slices: array1});
}
render(){
return(
<div>
<Slider sliderEvent = {this.handleSliderEvent.bind(this)}/>
<PieChart slices = {this.state.slices} />
</div>
)
}
}
ReactDOM.render(<App/>, document.getElementById('pie_chart'));
</script>
</body>
</html>
通过这个小提琴，它有你的代码的工作版本。
Go through the this fiddle as well which has working version of your code.
https://jsfiddle.net/oyqzms4c/
这篇关于如何更改制作动态饼图的状态？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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