Increment Decrement
/**
* Increment Decrement.
*
* Writing "a++" is equivalent to "a = a + 1".
* Writing "a--" is equivalent to "a = a - 1".
*/
int a;
int b;
bool direction;
void setup() {
size(640, 360);
colorMode(RGB, width);
a = 0;
b = width;
direction = true;
frameRate(30);
}
void draw() {
a++;
if (a > width) {
a = 0;
direction = !direction;
}
if (direction == true) {
stroke(a);
} else {
stroke(width - a);
}
line(a, 0, a, height / 2);
b--;
if (b < 0) {
b = width;
}
if (direction == true) {
stroke(width - b);
} else {
stroke(b);
}
line(b, height / 2 + 1, b, height);
}