83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
#include "animation.h"
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#include <stdio.h>
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time_line_t time_line_new(int t0, int y0, int t1, int y1) {
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int dt = t1 - t0;
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int dy = y1 - y0;
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int de = 2 * dy;
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int inc = dy > 0 ? 1 : dy == 0 ? 0 : -1;
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int error;
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if (de > 0) {
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error = de - dt;
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} else {
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error = de + dt;
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}
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return (time_line_t){ .y = y0, .dt = dt, .de = de, .error = error, .inc = inc, .dy = dy };
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}
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int time_line_next(time_line_t *self) {
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int error = self->error + self->de;
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if (self->de > 0) {
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while (error >= 0) {
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self->y += self->inc;
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error -= 2 * self->dt;
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}
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} else {
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while (error < 0) {
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self->y -= self->inc;
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error += 2 * self->dt;
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}
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}
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self->error = error;
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return self->y;
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}
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/*
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time_line_t time_line_new(int t0, int y0, int t1, int y1) {
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int dt = t1 - t0;
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int dy = y1 - y0;
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int inc = dy > 0 ? 1 : dy == 0 ? 0 : -1;
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int m = 2 * dy;
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int error = 0;
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if (m > 0) {
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error = m - dt;
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} else {
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error = m + dt;
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}
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return (time_line_t){ .y = y0, .m = m, .error = error, .inc = inc, .dt = dt };
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}
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*/
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/*
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int time_line_next(time_line_t *slope) {
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slope->error += slope->m;
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if (slope->m > 0) {
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if (slope->error >= 0) {
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slope->y += slope->inc;
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slope->error -= 2 * slope->dt;
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}
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} else {
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if (slope->error <= 0) {
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slope->y += slope->inc;
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slope->error += 2 * slope->dt;
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}
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}
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return slope->y;
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}
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*/
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void time_line_print(time_line_t *self) {
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printf("y: %d\tde: %d\terror: %d\tinc: %d\t:dt: %d\n", self->y, self->de, self->error, self->inc, self->dt);
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}
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