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39 lines
852 B
C
39 lines
852 B
C
/*
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* 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 "misc.h"
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static bool eq(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(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, 0, 1, 1, 0))
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return 270;
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fprintf(stderr, "unrecognized matrix %d %d %d %d\n",
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m[1], m[2], m[4], m[5]);
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exit(1);
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}
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