By Eric Rowell
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26 2 Shape Drawing and Composites In this chapter, we will cover: ff Drawing a rectangle ff Drawing a circle ff Working with custom shapes and fill styles ff Fun with Bezier curves: drawing a cloud ff Drawing transparent shapes ff Working with the context state stack to save and restore styles ff Working with composite operations ff Creating patterns with loops: drawing a gear ff Randomizing shape properties: drawing a field of flowers ff Creating custom shape functions: playing card suits ff Putting it all together: drawing a jet Introduction In Chapter 1, Getting Started with Paths and Text, we learned how to draw sub paths such as lines, arcs, Quadratic curves, and Bezier curves, and then we learned how to connect them together to form paths.
Stroke(); 4. stroke(); }; 5. Embed the canvas tag inside the body of the HTML document: How it works... To draw a gear with the HTML5 canvas, we can start by drawing the teeth around the gear. One way to draw teeth around a gear is to draw a radial zigzag pattern with beveled line joins. One great example of a radial zigzag is a star, which has five points along an imaginary inner circle, and five more points along an imaginary outer circle.
Follow these steps to draw a circle centered on the canvas: 1. getContext("2d"); 30 Chapter 2 2. stroke(); }; 3. Embed the canvas tag inside the body of the HTML document: How it works... As you might recall from Chapter 1, we can create an arc using the arc() method which draws a section of a circle defined by a starting angle and an ending angle. PI, false); See also... ff Creating patterns with loops: drawing a gear ff Transforming a circle into an oval in Chapter 4 ff Swinging a pendulum in Chapter 5 ff Simulating particle physics in Chapter 5 ff Animating a clock in Chapter 5 ff Detecting region events in Chapter 6 ff Creating a pie chart in Chapter 7 31 Shape Drawing and Composites Working with custom shapes and fill styles In this recipe, we'll draw four triangles and then fill each one with a different fill style.