28c3ec0268
* Line, Rect Functions * Test screen
95 lines
2 KiB
C
95 lines
2 KiB
C
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#include "SDL.h"
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#include <math.h>
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#include <stdbool.h>
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#include "draw.h"
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#include "config.h"
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void drawPixel(int x, int y, int color) {
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unsigned int *p = (unsigned int*)screen->pixels;
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int lineOffset = y * (screen->pitch/4);
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p[lineOffset+x] = color;
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}
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int _sign(float a) {
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return a > 0 ? 1 : (a < 0 ? -1 : 0);
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}
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void drawLine(int x1, int y1, int x2, int y2, int color) {
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float u, s, v, d1x, d1y, d2x, d2y, m, n;
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int x = x1, y = y1;
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u = x2-x1;
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v = y2-y1;
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d1x = d2x = _sign(u);
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d1y = _sign(v);
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d2y = 0;
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m = abs(u);
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n = abs(v);
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if (m <= n) {
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d2x = 0;
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d2y = _sign(v);
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m = abs(v);
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n = abs(u);
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}
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s = (int)(m/2);
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for (int i=0; i<round(m); i++) {
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drawPixel(x, y, color);
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s += n;
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if (s >= m) {
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s -= m;
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x += d1x;
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y += d1y;
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} else {
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x += d2x;
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y += d2y;
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}
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}
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}
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void drawRect(int x1, int y1, int x2, int y2, int color, bool filled) {
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int tmp;
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if (x1 > x2) { tmp = x1; x2 = x1; x1 = tmp; }
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if (y1 > y2) { tmp = y1; y2 = y1; y1 = tmp; }
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if (filled) {
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for (int i=y1; i<=y2; i++) drawLine(x1, i, x2, i, color);
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} else {
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drawLine(x1, y1, x2, y1, color);
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drawLine(x1, y1, x1, y2, color);
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drawLine(x2, y1, x2, y2, color);
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drawLine(x1, y2, x2, y2, color);
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}
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}
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// TODO: Write some code in here!
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void drawCircle(int x, int y, int radius, int color, bool filled) {
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}
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void drawScreen() {
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Uint32 white = SDL_MapRGB(screen->format, 255, 255, 255);
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drawPixel(SCREEN_WIDTH/2, SCREEN_HEIGHT/2, white);
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for (int i=0; i<250; i+=1)
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drawLine(200, 300-i, 600, 300+i, SDL_MapRGB(screen->format, 0, 0, i));
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drawRect(0, 50, 200, 300, white, true);
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drawRect(600, 300, 799, 550, white, false);
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// Random dots
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for (int i=0; i<100; i++)
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drawPixel(rand()%200+600, rand()%250+300, white);
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drawCircle(SCREEN_WIDTH/2, SCREEN_HEIGHT/2, 100, white, true);
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drawCircle(SCREEN_WIDTH/2, SCREEN_HEIGHT/2, 104, white, false);
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for (int i=0; i<=600; i++) drawLine(0, i, 799, i, white);
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}
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