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Canvas Cookbook

Canvas Cookbook

By : Purushottam Joshi
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Canvas Cookbook

Canvas Cookbook

By: Purushottam Joshi

Overview of this book

With the growing popularity of HTML5 Canvas, this book offers tailored recipes to help you develop portable applications, presentations, and games. The recipes are simple yet creative and build on each other. At every step, the book inspires the reader to develop his/her own recipe. From basic to advanced, every aspect of Canvas API has been covered to guide readers to develop their own application, presentation, or game.
Table of Contents (11 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Sections
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Paths and Text
1. Paths and Text
Introduction
Drawing lines
Drawing horizontal, vertical, and assorted lines
Drawing joins
Drawing arc1
Drawing arc2
Drawing a quadratic curve
Drawing a rainbow
Drawing a Bezier curve
Drawing a flag
Drawing text
Drawing 3D text with shadows
Adding shadows to objects
Drawing a house
2
2. Shapes and Composites
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2. Shapes and Composites
Introduction
Drawing rectangles
Drawing triangles
Drawing circles
Drawing gradients
Working with custom shapes and styles
Demonstrating translation, rotation, and scaling
Drawing an ellipse
Saving and restoring canvas state
Demonstrating composites
Drawing a mouse
3
3. Animation
3. Animation
Introduction
Creating an animation class
Demonstrating acceleration
Demonstrating gravity
Animating a line
Animating text
Animating a clock
Animating a solar system
Animating particles
Animating a particle fountain
Animating a rain effect
Animating a snow effect
4
4. Images and Videos
4. Images and Videos
Introduction
Drawing and cropping an image
Rendering effects to images
Drawing a mirror image
Clipping a path
Animated clipping
Converting canvas to image and back to canvas
Working with videos
Rendering effects to videos
Creating a pixelated image focus
5
5. Interactivity through Events
5. Interactivity through Events
Introduction
Working with mouse coordinates
Making a face smile
Detecting a point in a path
Simulating car movements
Dragging and dropping
Combining events and animation
Demonstrating a touch event
6
6. Creating Graphs and Charts
6. Creating Graphs and Charts
Introduction
Drawing the axes
Drawing a simple equation
Drawing a sinusoidal wave
Drawing a line graph
Drawing a bar graph
Drawing a pie chart
7
7. 3D Modeling
7. 3D Modeling
Introduction
Rendering 3D objects
Drawing 3D cubes
Drawing a 3D cylinder and a cone
Drawing a 3D sphere and a torus
Drawing 3D text decorated by particles
Drawing a panorama
Drawing a snowman
8
8. Game Development
8. Game Development
Introduction
Understanding the gaming states
Drawing on canvas
Playing some music
Using sprites from the sprite sheet
Demonstrating animation
Demonstrating collision
Demonstrating physics
Game 1 – Fruit Basket
Game 2 – Catapult
9
9. Interoperability and Deployment
9. Interoperability and Deployment
Introduction
Understanding interoperability
Styling text and background using CSS
Deploying a game on Android mobile
10
Index
Index

Drawing circles

Again, there is no direct function to draw a circle. It should be drawn using the function for drawing an arc. We saw a drawing of a circle in the previous chapter through the example of drawing arc2. The output of the circle recipe looks like this:

Drawing circles

How to do it…

The recipe is very simple. It calls the drawCircle() function in a loop to draw multiple circles as you see here. The recipe is as follows.

The HTML code:

<html>
<head>
<title>circles</title>
<script src="circles.js"></script>
</head>
<body onload="init()">
<canvas id="MyCanvasArea" width="300" height="300" style="border:2px solid blue;" >
   your browser does not support canvas
</canvas>
<h1>Circles</h1>
</body>
</html>

The JavaScript code:

function init(){
  var can=document.getElementById("MyCanvasArea");
  var ctx=can.getContext("2d");
  //call to...

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