Learning Processing: A Beginner's Guide to Programming Images ...

396 Learning Processing
// Draw lines at the threshold levels
stroke(0);
line(0,height-clapLevel*height/2,19,height-clapLevel*height/2 );
line(0,height-threshold*height/2,19,height-threshold*height/2 );
}
// Close the sound engine
public void stop() {
Sonia.stop();
super.stop();
}
Exercise 20-6: Trigger the event from Example 20-7 after a sequence of two claps. Here is
some code to get you started that assumes the existence of a variable named “ clapCount ” .
if (vol > c lapLevel & & !clapping) {
clapCount___;
if (_______________) {
}
________________;
________________;
________________;
_________________;
} else if (clapping & & vol < 0.5) {
}
clapping = false;
Exercise 20-7: Create a simple game that is controlled with volume. Suggestion: First make
the game work with the mouse, then replace the mouse with live input. Some examples are
Pong, where the paddle’s position is tied to volume, or Duck Hunt, where a bullet is shot
whenever the user claps.