Every time a new touch pointer is detected a series of events are triggered that allow to track the begin, change of position, and and of a touch.
void setup() {
fullScreen();
}
void draw() {
if (touchIsStarted) {
background(150);
} else {
background(255);
}
}
void touchStarted() {
println("touch started");
}
void touchMoved() {
println("touch moved");
}
void touchEnded() {
println("touch ended");
}