From 05982243dfbcd99849f594722b491c1e6568b744 Mon Sep 17 00:00:00 2001
From: Crizomb <62544756+Crizomb@users.noreply.github.com>
Date: Sat, 28 Dec 2024 00:24:43 +0100
Subject: [PATCH] Create main.cpp

---
 main.cpp | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 main.cpp

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..4770db2
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,130 @@
+#include <SDL2/SDL.h>
+#include <iostream>
+
+const int SCREEN_WIDTH = 750;
+const int SCREEN_HEIGHT = 750;
+const int CENTER_SCREEN_WIDTH = SCREEN_WIDTH/2;
+const int CENTER_SCREEN_HEIGHT = SCREEN_HEIGHT/2;
+const double ZOOM_FACTOR = 1.1;
+
+SDL_Window* createWindow(){
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
+        exit(-1);
+    }
+
+    SDL_Window* window = SDL_CreateWindow("Braindead Mandelbrot", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+  
+    if (window == nullptr) {
+        std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
+        SDL_Quit();
+        exit(-1);
+    }
+    
+    return window;
+}
+
+
+void handle_events(SDL_Event e, bool& quit, bool& cliqued, double* center_offset_x, double* center_offset_y, double* zoom, int* max_itter){
+    int mouse_x, mouse_y;
+    SDL_GetMouseState(&mouse_x, &mouse_y);
+    
+    while (SDL_PollEvent(&e) != 0) {
+            if (e.type == SDL_QUIT) {
+                quit = true;
+            }
+
+            if (e.type == SDL_MOUSEBUTTONDOWN) {
+                if (e.button.button == SDL_BUTTON_LEFT) {
+                    
+                    *center_offset_y += (double) (mouse_y - CENTER_SCREEN_HEIGHT) / *zoom;
+                    *center_offset_x += (double) (mouse_x - CENTER_SCREEN_WIDTH) / *zoom;
+                    std::cout << "New center offset " << *center_offset_x << ", " << *center_offset_y << ")\n";
+                }
+
+                if (e.button.button == SDL_BUTTON_RIGHT) {
+                    *max_itter = (int)((double)*max_itter * 1.1);
+                    std::cout << "Increase max_itter :" << *max_itter << "\n";
+                }
+
+                if (e.button.button == SDL_BUTTON_MIDDLE) {
+                    *max_itter = (int)((double)*max_itter / 1.1);
+                    std::cout << "Decrease max_itter :" << *max_itter << "\n";
+                }
+            }
+            else if (e.type == SDL_MOUSEWHEEL){
+                if (e.wheel.y == 1){
+                    *zoom *= ZOOM_FACTOR;
+                    std::cout << "Increase zoom :" << *zoom << "\n";
+                }
+                else{
+                    *zoom /= ZOOM_FACTOR;
+                    std::cout << "Decrease zoom :" << *zoom << "\n";
+                }
+            }
+            
+
+        }
+}
+
+int mandelbrot_pixel(double cx, double cy, int max_itter){
+    double ux = 0.0;
+    double uy = 0.0;
+    double temp_ux;
+    for (int i = 0; i < max_itter; i++) {
+        temp_ux = ux;
+        ux = ux*ux - uy*uy + cx;
+        uy = 2*uy*temp_ux + cy;
+        if (ux*ux + uy*uy > 4) return i;
+    }
+    return 0;
+}
+
+void draw_mandelbrot(SDL_Renderer* renderer, double center_offset_x, double center_offset_y, double zoom, int max_itter) {
+    double cx, cy;
+    for (int y = 0; y < SCREEN_HEIGHT; ++y) {
+        for (int x = 0; x < SCREEN_WIDTH; ++x) {
+            cy = 4.0 * (y + center_offset_y * zoom) / SCREEN_HEIGHT - 2.0;
+            cx = 4.0 * (x + center_offset_x * zoom) / SCREEN_WIDTH - 2.0;
+
+            int mandelbrot_escape = mandelbrot_pixel(cx / zoom, cy / zoom, max_itter);
+
+            if (mandelbrot_escape) {
+                uint8_t r = mandelbrot_escape % 255;
+                uint8_t g = (2*mandelbrot_escape) % 255;
+                uint8_t b = (3*mandelbrot_escape) % 255;
+
+                SDL_SetRenderDrawColor(renderer, r, g, b, 255);
+                SDL_RenderDrawPoint(renderer, x, y);
+            } else {
+                SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+                SDL_RenderDrawPoint(renderer, x, y);
+            }
+        }
+    }
+}
+
+
+int main() {
+
+    SDL_Window* window = createWindow();
+    SDL_Event e;
+    bool quit = false;
+    bool clicked = false;
+    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+    double center_offset_y = 0.0;
+    double center_offset_x = 0.0;
+    double zoom = 1.0;
+    int max_itter = 255;
+
+    while (!quit) {
+        handle_events(e, quit, clicked, &center_offset_x, &center_offset_y, &zoom, &max_itter);
+        draw_mandelbrot(renderer, center_offset_x, center_offset_y, zoom, max_itter);
+        SDL_RenderPresent(renderer);
+    }
+
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return 0;
+}