Lecture13: Scan Conversion and Filling Algorithm, 1D Parametrization and Tesselation.

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Programming

• Add to Canvas class the following member function,

           void Clear(RGB col = Black);
  

  which set all pixels of the canvas to the given color.

• Change the ScanLineSegment() member function in the Canvas, so that now it will have special and more efficient code for horizontal, vertical or diagonal lines.

  Submit your new function definition to xchen AT cs DOT utah DOT edu before the end of the morning class. (Please just copy and paste into your message editor window).

• Using ScanLineSegment(), add the following member functions into Canvas class.

        void WireTriangle(int x1, int y1,  RGB const& col1, int x2, int y2,  RGB const& col2, int x3, int y3, RGB const& col3);
  
        void WireCircle(int center_x, int center_y, int radius, RGB const& col);
        void SolidCircle(int center_x, int center_y, int radius, RGB const& col);
  
        void WireRectangle(int minx, int miny, int maxx, int maxy, RGB const& col); 
        void SolidRectangle(int minx, int miny, int maxx, int maxy, RGB const& col);
  

Homework: Do at least one of the following. Be creative!

• Draw Curves. Goto this link (or any other you have found), http://mathworld.wolfram.com/topics/PlaneCurves.html. There are whole bunch of plane curves with mathematical equations available.

• 2D Modelling. Use the geometry primitive in Canvas class to design any 2D model.

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