Constrain
/**
* Constrain.
*
* Move the mouse across the screen to move the circle.
* The program constrains the circle to its box.
*/
float mx = 0;
float my = 0;
float easing = 0.05f;
int radius = 24;
int edge = 100;
int inner = edge + radius;
void setup() {
size(640, 360);
noStroke();
ellipseMode(RADIUS);
rectMode(CORNERS);
}
void draw() {
background(51);
if (abs(mouseX - mx) > 0.1f) {
mx = mx + (mouseX - mx) * easing;
}
if (abs(mouseY - my) > 0.1f) {
my = my + (mouseY - my) * easing;
}
mx = constrain(mx, inner, width - inner);
my = constrain(my, inner, height - inner);
fill(76);
rect(edge, edge, width - edge, height - edge);
fill(255);
ellipse(mx, my, radius, radius);
}