Change the origin of a rectangle, so that it draws from the top-right corner.

Gerdon

Hello, I need help in drawing a rectangle from its top-right corner, rather than the top-left corner. I've tried using rectMode() but still can't figure out how to get it to its top-right corner. Is there any possible way to do this?

GoToLoop

Merely subtract rect()'s width from its coordinate x at its 1st argument: *-:)

// forum.Processing.org/two/discussion/22870/
// change-the-origin-of-a-rectangle-so-that-it-draws-
// from-the-top-right-corner#Item_1

// GoToLoop (2017-Jun-02)

void setup() {
  size(600, 400);
  smooth(3);
  noLoop();

  rectMode(CORNER);
  strokeWeight(2.5);
  stroke(#FF0000);
}

void draw() {
  int x = width>>1, y = height>>1;
  int w = width/2 + width/4, h = height>>2;

  background(#0000FF);

  fill(#00FF00);
  rect(x, 0, w, h);

  fill(#FFFF00);
  rectTopRight(x, y, w, h);
}

void rectTopRight(float x, float y, float w, float h) {
  rect(x - w, y, w, h);
}