Path2D.addPath() - Web APIs 编辑

The Path2D.addPath() method of the Canvas 2D API adds one Path2D object to another Path2D object.

Syntax

void path.addPath(path [, transform]);

Parameters

path

A Path2D path to add.

transform Optional

A DOMMatrix to be used as the transformation matrix for the path that is added. (Technically a DOMMatrixInit object).

Examples

Adding a path to an existing path

This example adds one path to another.

HTML

<canvas id="canvas"></canvas>

JavaScript

First, we create two separate Path2D objects, each of which contains a rectangle made using the rect() method. We then create a matrix using document.createElementNS() and createSVGMatrix(). We then add the second path to the first using addPath(), also applying the matrix to move the second path to the right. Finally, we draw the first path (which now contains both rectangles) using fill().

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

// Create first path and add a rectangle
let p1 = new Path2D();
p1.rect(0, 0, 100, 150);

// Create second path and add a rectangle
let p2 = new Path2D();
p2.rect(0, 0, 100, 75);

// Create transformation matrix that moves 200 points to the right
let m = document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGMatrix();
m.a = 1; m.b = 0;
m.c = 0; m.d = 1;
m.e = 200; m.f = 0;

// Add second path to the first path
p1.addPath(p2, m);

// Draw the first path
ctx.fill(p1);

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining this method: Path2D