add redraw the tree with KEY_R

main.cpp

@@ -6,6 +6,12 @@
 #include "raymath.h"
 
 #define MAX_DEPTH 11
+const int screenWidth = 800;
+const int screenHeight = 800;
+#define textureWidth screenWidth
+#define textureHeight screenHeight
+
+const Vector2 start = {textureWidth / 2, textureHeight};
 
 Color ColorLerp(Color c1, Color c2, float amount)
 {
@@ -32,6 +38,7 @@ struct draw_args
 
 static std::vector<branch> tree(MAX_DEPTH);
 static std::list<draw_args> draw_calls;
+static RenderTexture2D target;
 
 Vector2 draw_line(Vector2 start, float angleDeg, float lenghth, int dep)
 {
@@ -89,27 +96,25 @@ void generate_tree()
   tree[0].color = tree[1].color;
 }
 
-int main(void)
+void new_tree()
 {
-  const int screenWidth = 800;
-  const int screenHeight = 800;
-
-  InitWindow(screenWidth, screenHeight, "raylib");
-
-  SetTargetFPS(60);
-
-  const int textureWidth = screenWidth;
-  const int textureHeight = screenHeight;
-
-  RenderTexture2D target = LoadRenderTexture(textureWidth, textureHeight);
-  Vector2 start = {textureWidth / 2, textureHeight};
-
   generate_tree();
 
   BeginTextureMode(target);
   ClearBackground(WHITE);
   draw_tree((draw_args){start, 0, textureHeight / 4, 1});
   EndTextureMode();
+}
+
+int main(void)
+{
+  InitWindow(screenWidth, screenHeight, "raylib");
+
+  SetTargetFPS(60);
+
+  target = LoadRenderTexture(textureWidth, textureHeight);
+
+  new_tree();
 
   Rectangle source = {0, 0, (float)target.texture.width, (float)-target.texture.height};
   Rectangle dest = {0, 0, screenWidth, screenHeight};
@@ -118,6 +123,12 @@ int main(void)
 
   while (!WindowShouldClose())
   {
+
+    if (IsKeyPressed(KEY_R))
+    {
+      new_tree();
+    }
+
     BeginDrawing();
 
     DrawTexturePro(target.texture, source, dest, origin, 0.0f, WHITE);