CanvasRenderingContext2D.lineTo() - Web APIs 编辑

The CanvasRenderingContext2D method lineTo(), part of the Canvas 2D API, adds a straight line to the current sub-path by connecting the sub-path's last point to the specified (x, y) coordinates.

Like other methods that modify the current path, this method does not directly render anything. To draw the path onto a canvas, you can use the fill() or stroke() methods.

Syntax

ctx.lineTo(x, y);

Parameters

x

The x-axis coordinate of the line's end point.

y

The y-axis coordinate of the line's end point.

Return value

undefined.

Examples

Drawing a straight line

This example draws a straight line using the lineTo() method.

HTML

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

JavaScript

The line begins at (30, 50) and ends at (150, 100).

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

ctx.beginPath();       // Start a new path
ctx.moveTo(30, 50);    // Move the pen to (30, 50)
ctx.lineTo(150, 100);  // Draw a line to (150, 100)
ctx.stroke();          // Render the path

Result

Drawing connected lines

Each call of lineTo() (and similar methods) automatically adds to the current sub-path, which means that all the lines will all be stroked or filled together. This example draws a letter 'M' with a single contiguous line.

HTML

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

JavaScript

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

ctx.moveTo(90, 130);
ctx.lineTo(95, 25);
ctx.lineTo(150, 80);
ctx.lineTo(205, 25);
ctx.lineTo(210, 130);
ctx.lineWidth = 15;
ctx.stroke();

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining this method: CanvasRenderingContext2D
• CanvasRenderingContext2D.moveTo()
• CanvasRenderingContext2D.stroke()