From 86feca99437fadbbba24f330bccd8757fb56254e Mon Sep 17 00:00:00 2001
From: Mathias Wagner <germannewsmaker@gmail.com>
Date: Mon, 2 Dec 2024 09:38:36 +0100
Subject: [PATCH] Create Renderer#drawCircle

---
 src/Renderer.cpp | 37 +++++++++++++++++++++++++++++++++++--
 src/Renderer.h   |  3 ++-
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/src/Renderer.cpp b/src/Renderer.cpp
index 41bd87e..4c48269 100644
--- a/src/Renderer.cpp
+++ b/src/Renderer.cpp
@@ -1,5 +1,38 @@
 #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) {
     SDL_Rect src;
     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);
 }
 
-void drawText(SDL_Renderer *renderer, TTF_Font *font, const std::string text, int x, int y) {
-    SDL_Surface *surface = TTF_RenderText_Solid(font, text.c_str(), {255, 255, 255});
+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(), color);
     SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
 
     SDL_Rect src;
diff --git a/src/Renderer.h b/src/Renderer.h
index ca12e04..cbb32a2 100644
--- a/src/Renderer.h
+++ b/src/Renderer.h
@@ -8,6 +8,7 @@
 #define WINDOW_HEIGHT 500
 
 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
\ No newline at end of file