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Create Renderer#drawCircle

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This commit is contained in:
Mathias Wagner 2024-12-02 09:38:36 +01:00
parent ef72acbf0b
commit 86feca9943
2 changed files with 37 additions and 3 deletions
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37
src/Renderer.cpp
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@ -1,5 +1,38 @@
#include "Renderer.h" #include "Renderer.h"
void drawCircle(SDL_Renderer *renderer, int32_t centreX, int32_t centreY, int32_t radius) {
const int32_t diameter = (radius * 2);
int32_t x = (radius - 1);
int32_t y = 0;
int32_t tx = 1;
int32_t ty = 1;
int32_t error = (tx - diameter);
while (x >= y) {
SDL_RenderDrawPoint(renderer, centreX + x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX + x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX + y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX + y, centreY + x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY + x);
if (error <= 0) {
y++;
error += ty;
ty += 2;
}
if (error > 0) {
x--;
tx += 2;
error += (tx - diameter);
}
}
}
void drawTexture(SDL_Renderer *renderer, SDL_Texture *texture, int x, int y, int w, int h) { void drawTexture(SDL_Renderer *renderer, SDL_Texture *texture, int x, int y, int w, int h) {
SDL_Rect src; SDL_Rect src;
src.x = 0; src.x = 0;
@ -15,8 +48,8 @@ void drawTexture(SDL_Renderer *renderer, SDL_Texture *texture, int x, int y, int
SDL_RenderCopy(renderer, texture, &src, &dist); SDL_RenderCopy(renderer, texture, &src, &dist);
} }
void drawText(SDL_Renderer *renderer, TTF_Font *font, const std::string text, int x, int y) { void drawText(SDL_Renderer *renderer, TTF_Font *font, const std::string text, int x, int y, SDL_Color color) {
SDL_Surface *surface = TTF_RenderText_Solid(font, text.c_str(), {255, 255, 255}); SDL_Surface *surface = TTF_RenderText_Solid(font, text.c_str(), color);
SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface); SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
SDL_Rect src; SDL_Rect src;

3
src/Renderer.h
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@ -8,6 +8,7 @@
#define WINDOW_HEIGHT 500 #define WINDOW_HEIGHT 500
void drawTexture(SDL_Renderer *renderer, SDL_Texture *texture, int x, int y, int w, int h); void drawTexture(SDL_Renderer *renderer, SDL_Texture *texture, int x, int y, int w, int h);
void drawText(SDL_Renderer *renderer, TTF_Font *font, const std::string text, int x, int y); void drawText(SDL_Renderer *renderer, TTF_Font *font, std::string text, int x, int y, SDL_Color color);
void drawCircle(SDL_Renderer *renderer, int32_t centreX, int32_t centreY, int32_t radius);
#endif #endif