Eloquent JavaScript, 4th Edition

17

DRAWING ON CANVAS

Browsers give us several ways to display graphics. The simplest way is to use styles to position and color regular DOM elements. This can get us quite far, as the game in the previous chapter showed. By adding partially transparent background images to the nodes, we can make them look exactly the way we want. It is even possible to rotate or skew nodes with the transform style.

But we’d be using the DOM for something that it wasn’t originally designed for. Some tasks, such as drawing a line between arbitrary points, are extremely awkward to do with regular HTML elements.

There are two alternatives. The first is DOM based but utilizes Scalable Vector Graphics (SVG) rather than HTML. Think of SVG as a document-markup dialect ...