Add basic rotation

Rotate texuture based on mouse position

.vscode/launch.json

@@ -27,7 +27,7 @@
           "ignoreFailures": true
         }
       ],
-      "preLaunchTask": "build"
+      "preLaunchTask": "build-deb"
     }
   ]
 }

.vscode/tasks.json

@@ -10,11 +10,11 @@
       ]
     },
     {
-      "label": "clean",
+      "label": "build-deb",
       "type": "shell",
       "command": "make",
       "args": [
-        "clean"
+        "main"
       ]
     }
   ]

inc/Math.hpp

@@ -1,12 +1,5 @@
 #include "raylib.h"
 #include "raymath.h"
 
-Color ColorLerp(Color c1, Color c2, float amount)
+Color ColorLerp(Color c1, Color c2, float amount);
-{
+Rectangle CalculateRect(Vector2 center, float rotation, float width, float height);
-  Color ret{0};
-  ret.r = Clamp(Lerp(c1.r, c2.r, amount), 0, 255);
-  ret.g = Clamp(Lerp(c1.g, c2.g, amount), 0, 255);
-  ret.b = Clamp(Lerp(c1.b, c2.b, amount), 0, 255);
-  ret.a = Clamp(Lerp(c1.a, c2.a, amount), 0, 255);
-  return ret;
-}

main.cpp

@@ -1,5 +1,7 @@
 #include "raylib.h"
 #include "Tree.hpp"
+#include "Math.hpp"
+#include <cmath>
 
 int main(void)
 {
@@ -19,21 +21,36 @@ int main(void)
     Tree tree(800);
     tree.newTree();
 
-    int yPos = (screenHeight - screenWidth) / 2;
+    Vector2 center = {(float)screenWidth / 2, (float)screenHeight / 2};
-    Rectangle dest = {0, (float)yPos, (float)screenWidth, (float)screenWidth};
     float rotation = 0.0f;
+    Rectangle dest = CalculateRect(center, rotation, screenWidth, screenWidth);
+
     while (!WindowShouldClose())
     {
-      if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))
+      if (IsMouseButtonDown(MOUSE_BUTTON_LEFT))
+      {
+        int mouseX = GetMouseX();
+        center.x = mouseX;
+        float l = (float)mouseX / screenWidth;
+        rotation = Lerp(45.0f, -45.0f, l);
+        dest = CalculateRect(center, rotation, screenWidth, screenWidth);
+      }
+
+      if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT))
       {
         tree.newTree();
+        rotation = 0.0f;
+        center.x = screenWidth / 2;
+        center.y = screenHeight / 2;
+        dest = CalculateRect(center, rotation, screenWidth, screenWidth);
       }
       BeginDrawing();
-      ClearBackground(WHITE);
+      ClearBackground(RED);
       tree.draw(dest, rotation);
       EndDrawing();
     }
   }
+
   CloseWindow();
   return 0;
 }

src/Math.cpp

@@ -0,0 +1,27 @@
+#include "Math.hpp"
+
+Color ColorLerp(Color c1, Color c2, float amount)
+{
+  Color ret{0};
+  ret.r = Clamp(Lerp(c1.r, c2.r, amount), 0, 255);
+  ret.g = Clamp(Lerp(c1.g, c2.g, amount), 0, 255);
+  ret.b = Clamp(Lerp(c1.b, c2.b, amount), 0, 255);
+  ret.a = Clamp(Lerp(c1.a, c2.a, amount), 0, 255);
+  return ret;
+}
+
+Rectangle CalculateRect(Vector2 center, float rotation, float width, float height)
+{
+  Rectangle ret = {0, 0, width, height};
+  width /= 2;                                                      // a
+  height /= 2;                                                     // b
+  float len = std::sqrt(std::pow(width, 2) + std::pow(height, 2)); // c
+  rotation += 180.0f;                                              // add 180 to point 0 up
+  float angle = (rotation * PI) / 180.0f;                          // from degrees to radians
+  angle += std::atan(width / height);                              // add angle alfa
+  float nx = len * std::sin(angle);
+  float ny = len * std::cos(angle);
+  ret.x = center.x + nx;
+  ret.y = center.y + ny;
+  return ret;
+}

src/Tree.cpp

@@ -24,6 +24,7 @@ void Tree::draw(Rectangle dest, float rotation)
 {
   Rectangle source = {0, 0, (float)target.texture.width, (float)-target.texture.height};
   Vector2 origin = {0.0f, 0.0f};
+  rotation = 360 - rotation;
   DrawTexturePro(target.texture, source, dest, origin, rotation, WHITE);
 }