46 lines
No EOL
2 KiB
C
46 lines
No EOL
2 KiB
C
#ifdef ARC_SDL
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#include "arc/graphics/obround.h"
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#include "arc/graphics/sdl/renderer.h"
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#include <stdlib.h>
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//Modified from https://stackoverflow.com/questions/38334081/how-to-draw-circles-arcs-and-vector-graphics-in-sdl
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void ARC_Obround_Render(ARC_Obround *obround, ARC_Renderer *renderer, ARC_Color *color){
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SDL_SetRenderDrawColor((SDL_Renderer *)renderer, color->r, color->g, color->b, color->a);
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int32_t diameter = (obround->r * 2);
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int32_t x = (obround->r - 1);
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int32_t y = 0;
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int32_t tx = 1;
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int32_t ty = 1;
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int32_t error = (tx - diameter);
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SDL_RenderDrawLine((SDL_Renderer *)renderer, obround->x - obround->r, obround->y - (obround->h / 2), obround->x - obround->r, obround->y + (obround->h / 2));
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SDL_RenderDrawLine((SDL_Renderer *)renderer, obround->x + obround->r, obround->y - (obround->h / 2), obround->x + obround->r, obround->y + (obround->h / 2));
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while(x >= y){
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// Each of the following renders an octant of the circle
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x + x, obround->y - y - (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x + x, obround->y + y + (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x - x, obround->y - y - (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x - x, obround->y + y + (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x + y, obround->y - x - (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x + y, obround->y + x + (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x - y, obround->y - x - (obround->h / 2));
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, obround->x - y, obround->y + x + (obround->h / 2));
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if(error <= 0){
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++y;
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error += ty;
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ty += 2;
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}
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if(error > 0){
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--x;
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tx += 2;
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error += (tx - diameter);
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}
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}
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}
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#endif // ARC_SDL
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