1. Introduction   2. Draw a Circle   3. Add Some Color   4.
Action   5. Library: an Interlude   6. Bounce   7. Add a Paddle
8. The Keyboard   9. The Mouse   10. The Bricks   11. Finishing
Touches   12. Coda  Add Some Color  We can also turn our ball
different colors. Changing the value of ctx.fillStyle will
change the canvas' current color; we can set its value to a hex
string of the format '#rrggbb' or to a string 'rgba(r, g, b, a)'
where a is a value between 0 and 1 representing the transparency
of the color.  Play around a bit with the colors and the
rectangle's alpha value and see how the objects respond.  next
prev