Discover HTML5 Canvas essentials, draw shapes, delve into transformations and animations, and explore interactive applications with advanced mouse and keyboard handling. Gain insights into creating dynamic web graphics.

Kirupa is an MIT grad who works at Microsoft as Senior Program Manager. He has been tinkering with web technologies since 1998. He works on the Edge browser team where he gets to sink his teeth into the cutting-edge web technologies.

HTML5 is taking over the browsers and one of the coolest things in HTML5 is the canvas - the immediate mode drawing surface you have in HTML for bringing pixels to life using JavaScript. It is used to create games, graphs, and animations.

This is an extensive course with interactive playgrounds (so you don't have to install anything). The course can be divided into four parts.

1. Understand basics of Canvas and compare it with DOM.
2. Learn how to draw shapes.
3. Take a deep dive into canvas transformations and animations.
4. Explore advanced mouse and keyboard handling to create truly interactive applications using canvas.

If none of what I just wrote makes sense, then the content here is just what you need 😀 . Let's get started.

HTML5 Canvas: From Noob to Ninja - an interactive deep dive

The code for detecting whether a particular font is available is shown below:

//
// Call this function and pass in the name of the font you want to check for availability.
//
function doesFontExist(fontName) {
    // creating our in-memory Canvas element where the magic happens
    var canvas = document.createElement("canvas");
    var context = canvas.getContext("2d");
     
    // the text whose final pixel size I want to measure
    var text = "abcdefghijklmnopqrstuvwxyz0123456789";
     
    // specifying the baseline font
    context.font = "72px monospace";
     
    // checking the size of the baseline text
    var baselineSize = context.measureText(text).width;
     
    // specifying the font whose existence we want to check
    context.font = "72px '" + fontName + "', monospace";
     
    // checking the size of the font we want to check
    var newSize = context.measureText(text).width;
     
    // removing the Canvas element we created
    delete canvas;
     
    //
    // If the size of the two text instances is the same, the font does not exist because it is being rendered
    // using the default sans-serif font
    //
    if (newSize == baselineSize) {
        return false;
    } else {
        return true;
    }
}

Add this code to your page (or to a script file) and simply call the doesFontExist function and pass in the name of the font you are looking for. Below is an example:

DOM vs. Canvas

Getting Started with the Canvas

Drawing Basics / Lines

Drawing Curves

Drawing Multiple Things

Drawing Rectangles (and Squares)

Drawing Triangles

Drawing Circles

Modifying How Your Corners Look

Working with Colors

Drawing Text

Drawing Images

Canvas Transformations

Structuring Your Drawing Code

Animating with requestAnimationFrame

Creating Animations on the Canvas

Animating Many Things on the Canvas

Creating Motion Trails

Creating Sprite Animations

Working With the Mouse

Follow the Mouse Cursor

Mouse Follow with Ease

Working With the Keyboard

Moving Shapes Using the Keyboard

Resizing the HTML Canvas Element

Detect Whether a Font is Installed

Grab the Code