49 lines
No EOL
1.7 KiB
C
49 lines
No EOL
1.7 KiB
C
#include "arc/graphics/circle.h"
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#include "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_Circle_Render(ARC_Circle *circle, 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 = (circle->r * 2);
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int32_t x = (circle->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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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, circle->x + x, circle->y - y);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x + x, circle->y + y);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x - x, circle->y - y);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x - x, circle->y + y);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x + y, circle->y - x);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x + y, circle->y + x);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x - y, circle->y - x);
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SDL_RenderDrawPoint((SDL_Renderer *)renderer, circle->x - y, circle->y + x);
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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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//TODO: very temp
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void ARC_Circle_RenderFill(ARC_Circle *circle, ARC_Renderer *renderer, ARC_Color *color){
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ARC_Circle temp = *circle;
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for(; temp.r; temp.r--){
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ARC_Circle_Render(&temp, renderer, color);
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}
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} |