Description: a simple graphics package. A simple graphic design packages, it has been called the DDA procedures, and include the following functions : 1. Window (x1, y1, x2, y2) 2. Viewport (x1, y1, x2, y2) 3. MoveTo2 (x, y) 4. MoveBy2 (x, y) 5. LineTo2 (x, y) 6. LineBy2 (x, y) 7. Shift2 (dx, dy) 8. Pivot2 (x, y) 9. Rotate2 (angle) 10. Scale2 (Sx, Sy) 11. Design examples of the package function test.
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