ADDED: example: shapes_kaleidoscope

examples/shapes/shapes_kaleidoscope.c

@@ -0,0 +1,91 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - Kaleidoscope
+*
+*   Example complexity rating: [★★☆☆] 2/4
+*
+*   Example originally created with raylib 5.5, last time updated with raylib 5.6
+*
+*   Example contributed by Hugo ARNAL (@hugoarnal) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2025-2025 Hugo ARNAL (@hugoarnal)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - Kaleidoscope");
+
+    int symmetry = 6;
+    float angle = 360.0f / (float)symmetry;
+    float thickness = 3.0f;
+    Vector2 prevMousePos = { 0 };
+
+    SetTargetFPS(60);
+    ClearBackground(BLACK);
+
+    Vector2 offset = {(float)screenWidth / 2.0f, (float)screenHeight / 2.0f};
+    Camera2D camera = { 0 };
+    camera.target = (Vector2){ 0 };
+    camera.offset = offset;
+    camera.rotation = 0.0f;
+    camera.zoom = 1.0f;
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        Vector2 mousePos = GetMousePosition();
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            BeginMode2D(camera);
+                Vector2 lineStart = Vector2Subtract(mousePos, offset);
+                Vector2 lineEnd = Vector2Subtract(prevMousePos, offset);
+
+                if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) {
+                    for (int i = 0; i < symmetry; i++) {
+                        lineStart = Vector2Rotate(lineStart, angle * DEG2RAD);
+                        lineEnd = Vector2Rotate(lineEnd, angle * DEG2RAD);
+
+                        DrawLineEx(lineStart, lineEnd, thickness, WHITE);
+
+                        //EndMode2D();
+                        // TODO: reflect line
+                        //BeginMode2D(camera);
+
+                    }
+                }
+
+                prevMousePos = mousePos;
+            EndMode2D();
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}