/*
  In this example, the user can draw a rectangle by selecting one
  corner and then dragging the mouse to the opposite corner.
*/

int x,y;

// This function is executed only once, at the very beginning
void setup() {
  size(500,400);
  background(255);
  fill(128, 128, 255);
}


// This function is repeatedly call in an implicit loop.
// A single call is responsible for drawing a single frame.
void draw() {
}

void mousePressed() {
  x = mouseX;
  y = mouseY;
}

void mouseDragged() {
  background(255);
  noFill();
  int w = abs(mouseX-x);
  int h = abs(mouseY-y);
  rect(min(x,mouseX), min(y,mouseY), w, h);
}

void mouseReleased() {
  background(255);
  fill(128,128,255);
  int w = abs(mouseX-x);
  int h = abs(mouseY-y);
  rect(min(x,mouseX), min(y,mouseY), w, h);
}