我正在尝试在一个React应用程序中使用 p5
(https://p5js.org/),但一些草图的性能非常差(包括开发和构建后的应用程序)。项目骨架是使用create-react-app
创建的,没有进行任何构建设置更改。
当直接在浏览器中运行草图时,它们运行大约50-60帧每秒,但当加载到React中时,帧率降至1-2帧每秒。
我是通过以下方式将草绘与React连接的:
// React Component to interface the sketches
class P5Wrapper extends React.Component {
componentDidMount() {
const { sketch, ...rest } = this.props;
this.canvas = new p5(sketch(rest), this.wrapper);
}
componentWillReceiveProps(newProps) {
const { sketch, ...rest } = newProps;
if (this.props.sketch !== newProps.sketch) {
this.canvas.remove();
this.canvas = new p5(newProps.sketch(rest), this.wrapper);
}
if (typeof this.canvas.onNewProps === "function") {
this.canvas.onNewProps(newProps);
}
}
componentWillUnmount() {
this.canvas.remove();
}
render() {
return <div ref={(wrapper) => this.wrapper = wrapper} />;
}
}
// you can watch the sketch in action here (https://p5js.org/examples/simulate-game-of-life.html)
const gameOfLife = (props) => (p) => {
let w;
let columns;
let rows;
let board;
let next;
p.setup = () => {
p.createCanvas(1024, 768);
p.background(255);
p.noStroke();
w = 20;
columns = p.floor(p.width / w);
rows = p.floor(p.height / w);
board = new Array(columns);
for (let i = 0; i < columns; i++) {
board[i] = new Array(rows);
}
next = new Array(columns);
for (let i = 0; i < columns; i++) {
next[i] = new Array(rows);
}
init();
};
p.draw = () => {
generate();
for (let i = 0; i < columns; i++) {
for (let j = 0; j < rows; j++) {
if ((board[i][j] === 1)) p.fill(0);
else p.fill(255);
p.rect(i * w, j * w, w - 1, w - 1);
}
}
};
p.mousePressed = () => {
init();
};
const init = () => {
for (let i = 0; i < columns; i++) {
for (let j = 0; j < rows; j++) {
if (i === 0 || j === 0 || i === columns - 1 || j === rows - 1) board[i][j] = 0;
else board[i][j] = p.floor(p.random(2));
next[i][j] = 0;
}
}
};
const generate = () => {
for (let x = 1; x < columns - 1; x++) {
for (let y = 1; y < rows - 1; y++) {
let neighbors = 0;
for (let i = -1; i <= 1; i++) {
for (let j = -1; j <= 1; j++) {
neighbors += board[x + i][y + j];
}
}
neighbors -= board[x][y];
if ((board[x][y] === 1) && (neighbors < 2)) next[x][y] = 0;
else if ((board[x][y] === 1) && (neighbors > 3)) next[x][y] = 0;
else if ((board[x][y] === 0) && (neighbors === 3)) next[x][y] = 1;
else next[x][y] = board[x][y];
}
}
const temp = board;
board = next;
next = temp;
};
};
// render the wrapper and the sketch
ReactDOM.render(<P5Wrapper sketch={gameOfLife} />, document.getElementById("root"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.0/p5.js"></script>
<div id="root"/>
是什么导致了这种减速?
shouldComponentUpdate
函数设置为返回false
,您可能会获得更好的结果。 - Mike 'Pomax' Kamermans