Draws a rectangle to the screen. A rectangle is a four-sided shape with every angle at ninety degrees. By default, the first two parameters set the location of the upper-left corner, the third sets the width, and the fourth sets the height. The way these parameters are interpreted, however, may be changed with the rectMode() function.

To draw a rounded rectangle, add a fifth parameter, which is used as the radius value for all four corners.

To use a different radius value for each corner, include eight parameters. When using eight parameters, the latter four set the radius of the arc at each corner separately, starting with the top-left corner and moving clockwise around the rectangle.


  • size(400, 400);
    rect(120, 80, 220, 220);
    Image output for example 1
  • size(400, 400);
    rect(120, 80, 220, 220, 28);
    Image output for example 2
  • size(400, 400);
    rect(120, 80, 220, 220, 12, 24, 48, 72);
    Image output for example 3


  • rect(a, b, c, d)
  • rect(a, b, c, d, r)
  • rect(a, b, c, d, tl, tr, br, bl)


  • a(float)x-coordinate of the rectangle by default
  • b(float)y-coordinate of the rectangle by default
  • c(float)width of the rectangle by default
  • d(float)height of the rectangle by default
  • r(float)radii for all four corners
  • tl(float)radius for top-left corner
  • tr(float)radius for top-right corner
  • br(float)radius for bottom-right corner
  • bl(float)radius for bottom-left corner


  • void