Added Panning

include/constants.hpp

@@ -2,10 +2,7 @@
 
 namespace Constants {
 constexpr int maxIterations{2000};
-constexpr int windowWidth{600};
-constexpr int windowHeight{600};
-constexpr double posRealRange{1.0};
-constexpr double negRealRange{-2.5};
-constexpr double posImagRange{1.25};
-constexpr double negImagRange{-1.25};
+constexpr int windowWidth{900};
+constexpr int windowHeight{900};
+
 } // Namespace Constants

main.cpp

@@ -9,7 +9,8 @@ Color LerpColor(Color a, Color b, float t) {
           (unsigned char)(a.b + (b.b - a.b) * t), 255};
 }
 
-void drawMandelbrot() {
+void drawMandelbrot(double maxReal = 1.0, double minReal = -2.5,
+                    double maxImag = 1.25, double minImag = -1.25) {
   using namespace Constants;
 
   double xNorm{};
@@ -17,37 +18,85 @@ void drawMandelbrot() {
   double cReal{};
   double cImag{};
 
-  for (int x{}; x <= Constants::windowWidth; ++x) {
-    for (int y{}; y <= Constants::windowHeight; ++y) {
+  for (int x{}; x <= windowWidth; ++x) {
+    for (int y{}; y <= windowHeight; ++y) {
       xNorm = x / static_cast<double>(Constants::windowWidth);
       yNorm = y / static_cast<double>(Constants::windowHeight);
 
-      cReal = negRealRange + xNorm * (posRealRange - negRealRange);
-      cImag = negImagRange + yNorm * (posImagRange - negImagRange);
+      cReal = minReal + xNorm * (maxReal - minReal);
+      cImag = minImag + yNorm * (maxImag - minImag);
 
       int iterationsMandelbrot{calculateMandelbrot(cReal, cImag)};
 
-      float t = static_cast<float>(iterationsMandelbrot) / maxIterations;
-      Color color = LerpColor(BLUE, RED, t);
-      DrawPixel(x, y, color);
+      if (iterationsMandelbrot - 1 == maxIterations) {
+        DrawPixel(x, y, BLACK);
+      } else {
+        float t = static_cast<float>(iterationsMandelbrot) / maxIterations;
+        Color color = LerpColor(BLUE, RED, t);
+        DrawPixel(x, y, color);
+      }
+
       // std::cout << "Iterations: " << iterationsMandelbrot << '\n';
     }
   }
 }
 
 int main() {
+  double maxReal{1.0};
+  double minReal{-2.5};
+  double maxImag{1.25};
+  double minImag{-1.25};
   InitWindow(Constants::windowWidth, Constants::windowHeight,
              "Mandelbrot Plot");
   SetTargetFPS(60);
 
+  RenderTexture2D target =
+      LoadRenderTexture(Constants::windowWidth, Constants::windowHeight);
+  bool needsRedraw = true;
+
   while (!WindowShouldClose()) {
+    if (IsKeyPressed(KEY_UP)) {
+      maxImag += 0.1;
+      minImag += 0.1;
+      needsRedraw = true;
+      std::cout << "Runter!" << '\n';
+    }
+    if (IsKeyPressed(KEY_DOWN)) {
+      maxImag -= 0.1;
+      minImag -= 0.1;
+      needsRedraw = true;
+      std::cout << "Hoch!" << '\n';
+    }
+    if (IsKeyPressed(KEY_LEFT)) {
+      maxReal += 0.1;
+      minReal += 0.1;
+      needsRedraw = true;
+      std::cout << "Links!" << '\n';
+    }
+    if (IsKeyPressed(KEY_RIGHT)) {
+      maxReal -= 0.1;
+      minReal -= 0.1;
+      needsRedraw = true;
+      std::cout << "Rechts!" << '\n';
+    }
+
+    if (needsRedraw) {
+      BeginTextureMode(target);
+      ClearBackground(RAYWHITE);
+      drawMandelbrot(maxReal, minReal, maxImag, minImag);
+      EndTextureMode();
+      needsRedraw = false;
+    }
 
     BeginDrawing();
-    ClearBackground(RAYWHITE);
-    drawMandelbrot();
+    DrawTextureRec(
+        target.texture,
+        {0, 0, (float)target.texture.width, -(float)target.texture.height},
+        {0, 0}, WHITE);
     EndDrawing();
   }
 
+  UnloadRenderTexture(target);
   CloseWindow();
   return 0;
 }