[英]How to translate this Processing code to p5.js?
几年前,我用 Processing 编写了这个程序:
import processing.pdf.*; drawing w; void setup() { size(1080, 720); beginRecord(PDF, "drawing.pdf"); w = new drawing(); background(0); } void draw() { w.step(); w.render(); } class drawing { float x, y; float tx, ty; float prevX, prevY; drawing() { tx = 0; ty = 90000; x = map(noise(tx), 0, 0.2, 0, width); y = map(noise(ty), 0, 0.2, 0, height); } void render() { stroke(255); line(prevX, prevY, x, y); } void step() { prevX = x; prevY = y; x = map(noise(tx), 0, 1, 0, width); y = map(noise(ty), 0, 1, 0, height); tx += 0.01; ty += 0.01; } } void keyPressed() { if (key == 'a') { endRecord(); exit(); } }
现在我想把它作为 p5.js 代码。 我认为它可以这样工作:
drawing w; function setup() { createCanvas(720, 400); w = new drawing(); background(0); } function draw() { w.step(); w.render(); } class drawing { float x, y; float tx, ty; float prevX, prevY; drawing() { tx = 0; ty = 90000; x = map(noise(tx), 0, 0.2, 0, width); y = map(noise(ty), 0, 0.2, 0, height); } function render() { stroke(255); line(prevX, prevY, x, y); } function step() { prevX = x; prevY = y; x = map(noise(tx), 0, 1, 0, width); y = map(noise(ty), 0, 1, 0, height); tx += 0.01; ty += 0.01; } }
<script src="https://cdn.jsdelivr.net/npm/p5@1.4.1/lib/p5.js"></script>
不幸的是,它不起作用。 有谁知道如何解决这个问题?
您的很多 java 代码都没有很好地转换为 javascript。
我更改了以下内容:
float x
。 但是在 JS 中,您使用let
,例如let x
。 class Drawing { constructor() { this.tx = 0; this.ty = 90000; this.x = map(noise(this.tx), 0, 0.2, 0, width); this.y = map(noise(this.ty), 0, 0.2, 0, height); } render() { stroke(255); line(this.prevX, this.prevY, this.x, this.y); } step() { this.prevX = this.x; this.prevY = this.y; this.x = map(noise(this.tx), 0, 1, 0, width); this.y = map(noise(this.ty), 0, 1, 0, height); this.tx += 0.01; this.ty += 0.01; } } let w; function setup() { createCanvas(720, 400); w = new Drawing(); background(0); } function draw() { w.step(); w.render(); }
<script src="https://cdn.jsdelivr.net/npm/p5@1.4.1/lib/p5.js"></script>
在这里,您需要使用constructor()从 Drawing 中实例化一个新的 Object,另外不要忘记使用this关键字来访问变量。
你也可以看到它在这里工作:
https://editor.p5js.org/ghaithalzein05/sketches/veGh2JAYC
let w;
function setup() {
createCanvas(400, 400);
background(0);
w = new Drawing();
}
function draw() {
w.step();
w.render();
}
class Drawing {
constructor() {
this.nextX = 0;
this.nextY = 90000;
this.x = map(noise(this.nextX), 0, 0.2, 0, width);
this.y = map(noise(this.nextY), 0, 0.2, 0, height);
this.px = 0;
this.py = 0;
}
render() {
stroke(255);
line(this.px, this.py, this.x, this.y);
}
step() {
this.px = this.x;
this.py = this.y;
this.x = map(noise(this.nextX), 0, 1, 0, width);
this.y = map(noise(this.nextY), 0, 1, 0, height);
this.nextX += 0.01;
this.nextY += 0.01;
}
}
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