mirror of https://git.sr.ht/~rabbits/uxn
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include <stdio.h>
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#include <math.h>
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/*
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Copyright (c) 2020-2023 Devine Lu Linvega
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#define PI 3.14159265358979323846
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typedef unsigned char Uint8;
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int
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clamp(int val, int min, int max)
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{
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return (val >= min) ? (val <= max) ? val : max : min;
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}
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int
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sint(char *s)
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{
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int i = 0, num = 0;
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while(s[i] && s[i] >= '0' && s[i] <= '9')
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num = num * 10 + (s[i++] - '0');
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return num;
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}
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int
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main(int argc, char *argv[])
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{
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int seg, offset, i;
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double segf, cx = 128, cy = 128, r;
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if(argc < 2) {
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printf("usage: circle128 length [radius]\n", argc);
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return 1;
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}
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seg = sint(argv[1]);
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segf = (double)seg;
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offset = seg / 4;
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r = argc < 3 ? 128 : (double)sint(argv[2]);
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printf("%d points on a circle%d:\n\n", seg, (int)r);
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for(i = 0; i < seg; ++i) {
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double pos = (i - offset) % seg;
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double deg = (pos / segf) * 360.0;
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double rad = deg * (PI / 180);
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double x = cx + r * cos(rad);
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double y = cy + r * sin(rad);
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if(i > 0 && i % 8 == 0)
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printf("\n");
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printf("%02x%02x ", (Uint8)clamp(x, 0x00, 0xff), (Uint8)clamp(y, 0x00, 0xff));
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}
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printf("\n\n");
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return 0;
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}
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