createCanvas(400, 400);

  // using the coordinates of two diagonal corner points of rectangle

  rect(topLeftX, topLeftY, bottomRightX, BottomRightY);

  // using center of the rectangle as a starting point and use width and height

  rect(centerX, centerY, width, height);

  // using coordinates of every four corner points of rectangle

  rect(topLeftX, topLeftY, topRightX, topRightY, bottomLeftX, bottomLeftY, bottomRightX, bottomRightY)

}

​

​