如何在画布中定位 Path2D SVG 元素? [英] How to position Path2D SVG element in canvas?

问题描述

我正在画布上绘制一个 path2D SVG 形状.问题是 moveTo 函数在使用 SVG 数据时似乎不起作用.

I'm drawing a path2D SVG shape on canvas. The problem is that the moveTo function does not seem to work when using SVG data.

此代码笔说明了该问题.https://codepen.io/grasmachien/pen/rNaJeBN

The problem is illustrated in this codepen. https://codepen.io/grasmachien/pen/rNaJeBN

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

let p = new Path2D('M10 10 h 80 v 80 h -80 Z');
p.moveTo(100,100)
ctx.fill(p);

有没有办法在不移动画布的情况下移动路径?

Is there a way to move the path without moving the canvas?

推荐答案

使用变换移动路径

使用 CanvasRenderingContext2D.translate

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

let p = new Path2D('M10 10 h 80 v 80 h -80 Z');
ctx.translate(100, 100);
ctx.fill(p);

或使用 CanvasRenderingContext2D.setTransform

let p = new Path2D('M10 10 h 80 v 80 h -80 Z');
ctx.setTransform(1, 0, 0, 1, 100, 100);  // Also resets the transform before applying
ctx.fill(p);

或使用 CanvasRenderingContext2D.transform

let p = new Path2D('M10 10 h 80 v 80 h -80 Z');
ctx.transform(1, 0, 0, 1, 100, 100);  
ctx.fill(p);

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