- HTML5 Canvas Cookbook
- Eric Rowell
- 228字
- 2021-08-27 12:08:03
Drawing a line
When learning how to draw with the HTML5 canvas for the first time, most people are interested in drawing the most basic and rudimentary element of the canvas. This recipe will show you how to do just that by drawing a simple straight line.
How to do it...
Follow these steps to draw a diagonal line:
- Define a 2D canvas context and set the line style:
window.onload = function(){ // get the canvas DOM element by its ID var canvas = document.getElementById("myCanvas"); // declare a 2-d context using the getContext() method of the // canvas object var context = canvas.getContext("2d"); // set the line width to 10 pixels context.lineWidth = 10; // set the line color to blue context.strokeStyle = "blue"; - Position the canvas context and draw the line:
// position the drawing cursor context.moveTo(50, canvas.height - 50); // draw the line context.lineTo(canvas.width - 50, 50); // make the line visible with the stroke color context.stroke(); }; - Embed the canvas tag inside the body of the HTML document:
Note
Downloading the example code
You can run the demos and download the resources for this book from www.html5canvastutorials.com/cookbook or you can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the files e-mailed directly to you.