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Types point2D, vector2D and colorA [13/13]

This demonstrational program illustrates a vector with an arrow. This program is virtually identical to the previous one, except for the function DrawArrow.

While vectors cannot be drawn, an arrow can be used to represent a vector. However, vectors are not arrows since arrows have a beginning and an end, while a vector doesn't have such properties.

To draw the arrow, a function-procedure named DrawArrow was written. Functions and procedures are explained in the next two chapters. The remaining part of the program (the top half, above the comment) should be comprehensible.