Instead of graphing velocity, we will use vectors to draw a basic image. We will then focus on the manipulation of this image via special matrices and matrix mathematics. To see how this works, let's review some basic operations on vectors. The addition of two vectors can be shown graphically. The combination of the two is the same as a vector starting from the origin connecting to the head of the second one.
Subtraction follows in a similar fashion, but reverses the direction of the second vector.
Although our example is simple in nature, many vectors can be combined to generate complex drawings. Let's try an example to illustrate what can be done. Essentially, the dMultiLine function is performing a vector addition operation. The function does not actually do the math, but it does graphically represent the operation. The points chosen trace out a simple box structure of a house centered on the plot axis.