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121 lines
1.9 KiB
C
121 lines
1.9 KiB
C
/*
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* gfx/misc.c - Helper functions for geometry and attributes
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include "misc/diag.h"
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#include "gfx/misc.h"
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static bool eq(const int m[6], int xx, int xy, int yx, int yy)
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{
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return m[1] == xx && m[2] == xy && m[4] == yx && m[5] == yy;
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}
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unsigned matrix_to_angle(const int m[6])
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{
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if (eq(m, 1, 0, 0, -1))
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return 0;
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if (eq(m, 0, -1, -1, 0))
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return 90;
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if (eq(m, -1, 0, 0, 1))
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return 180;
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if (eq(m, 0, 1, 1, 0))
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return 270;
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if (eq(m, -1, 0, 0, -1))
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return 0;
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if (eq(m, 0, 1, -1, 0)) /* x-flipped, 90 deg */
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return 90;
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if (eq(m, 1, 0, 0, 1)) /* x-flipped */
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return 180;
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if (eq(m, 0, -1, 1, 0)) /* x-flipped, 270 deg */
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return 270;
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fatal("unrecognized matrix %d %d %d %d\n", m[1], m[2], m[4], m[5]);
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}
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bool matrix_is_mirrored(const int m[6])
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{
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if (eq(m, 1, 0, 0, -1))
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return 0;
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if (eq(m, 0, -1, -1, 0))
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return 0;
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if (eq(m, -1, 0, 0, 1))
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return 0;
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if (eq(m, 0, 1, 1, 0))
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return 0;
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if (eq(m, -1, 0, 0, -1))
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return 1;
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if (eq(m, 0, 1, -1, 0))
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return 1;
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if (eq(m, 1, 0, 0, 1))
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return 1;
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if (eq(m, 0, -1, 1, 0))
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return 1;
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assert(0);
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}
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int angle_add(int a, int b)
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{
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a += b;
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while (a < 0)
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a += 360;
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return a % 360;
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}
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int rx(int x, int y, int rot)
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{
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switch (rot) {
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case 0:
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return x;
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case 90:
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return y;
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case 180:
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return -x;
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case 270:
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return -y;
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default:
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assert(0);
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}
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}
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int ry(int x, int y, int rot)
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{
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switch (rot) {
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case 0:
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return y;
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case 90:
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return -x;
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case 180:
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return -y;
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case 270:
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return x;
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default:
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assert(0);
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}
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}
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