37 lines
874 B
C
37 lines
874 B
C
#ifndef __ANIMATION_H__
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#define __ANIMATION_H__
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#ifdef __AVR__
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#include <avr/io.h>
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#else
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typedef int uint8_t;
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#endif
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// line_t provides a simplified implementation of Bresenham's line drawing
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// technique. At this time, it assumes a transition of x = 0 -> 60, and a dy
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// between -59 and 59. I am not sure I understand Bresenham's algorithm yet,
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// but I'll need to revisit all of this if I want to expand the boundaries.
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typedef struct {
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int y;
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int de;
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int error;
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int inc;
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int dt;
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int dy;
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int y0;
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int y1;
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} time_line_t;
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// Construct a new line object. x1 must be greater than x0, and dy must be less than dx.
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time_line_t time_line_new(int, int, int, int);
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// Calculate the next y value of the line.
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int time_line_next(time_line_t *);
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// Diagnostic printout of the current state of line_t.
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void time_line_print(time_line_t *);
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#endif
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