Lesson #6: Colored Lines and Vector Functions

Notes:

Graphics Lesson 2j - Colored Lines.pdf

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Graphics Lesson 2m - Vector Library.pdf

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Code:

3 - line_template.txt

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Hints:

Step #1: Adding per-pixel color

The only difference is the additional arguments for red, green, blue:

Now we set color for every pixel we draw:

Now we have to also swap colors and calculate color slopes:

Step #2: Adding class/struct to encapsulate variables:

Add SWAP_POINT() function:

Add class to hold pos[] and color[] data for POINT:

Rewrite draw_line() function to use POINT class:

Step #3: Use "vector" instructions to make code more compact:

Add "vector" functions:

Rewrite draw_line() function using "vector" routines:

Step #4: combining cases to make code shorter:

Exercises:

write draw_quad() function to draw rectangle using POINTs:

Write function to draw one quad:

Write function to draw many quads: