In the Graffiti Grapher software we will use Cartesian coordinates to locate the start and finish of each line. Each coordinate is a pair of numbers. The X coordinate tells you how far left or right. The Y coordinate tells you how far up or down. Cartesian coordinates use both negative and positive numbers, so don't forget to use the "-" sign.

The most important lines in Graffiti Grapher are the borders. Every two borders gives you a "shape." A collection of shapes is called a "group." Here is a group of two shapes. Shape 1 has green borders, shape 2 has red borders.