This example is for Processing 2+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.
All shapes drawn to the screen have a position that is specified as a coordinate. All coordinates are measured as the distance from the origin in units of pixels. The origin [0, 0] is the coordinate is in the upper left of the window and the coordinate in the lower right is [width-1, height-1].
// Sets the screen to be 640 pixels wide and 360 pixels high size(640, 360); // Set the background to black and turn off the fill color background(0); noFill(); // The two parameters of the point() method each specify coordinates. // The first parameter is the x-coordinate and the second is the Y stroke(255); point(width * 0.5, height * 0.5); point(width * 0.5, height * 0.25); // Coordinates are used for drawing all shapes, not just points. // Parameters for different functions are used for different purposes. // For example, the first two parameters to line() specify // the coordinates of the first endpoint and the second two parameters // specify the second endpoint stroke(0, 153, 255); line(0, height*0.33, width, height*0.33); // By default, the first two parameters to rect() are the // coordinates of the upper-left corner and the second pair // is the width and height stroke(255, 153, 0); rect(width*0.25, height*0.1, width * 0.5, height * 0.8);