[examples] Added shapes_kaleidoscope (#5233)

* ADDED: example: `shapes_kaleidoscope`

* Add line reflection

* Updated with `rexm update`

* Follow raylib's conventions

examples/Makefile

@@ -554,6 +554,7 @@ SHAPES = \
     shapes/shapes_easings_box \
     shapes/shapes_easings_rectangles \
     shapes/shapes_following_eyes \
+    shapes/shapes_kaleidoscope \
     shapes/shapes_lines_bezier \
     shapes/shapes_logo_raylib \
     shapes/shapes_logo_raylib_anim \

examples/Makefile.Web

@@ -554,6 +554,7 @@ SHAPES = \
     shapes/shapes_easings_box \
     shapes/shapes_easings_rectangles \
     shapes/shapes_following_eyes \
+    shapes/shapes_kaleidoscope \
     shapes/shapes_lines_bezier \
     shapes/shapes_logo_raylib \
     shapes/shapes_logo_raylib_anim \
@@ -855,6 +856,9 @@ shapes/shapes_easings_rectangles: shapes/shapes_easings_rectangles.c
 shapes/shapes_following_eyes: shapes/shapes_following_eyes.c
 	$(CC) -o $@$(EXT) $< $(CFLAGS) $(INCLUDE_PATHS) $(LDFLAGS) $(LDLIBS) -D$(PLATFORM)
 
+shapes/shapes_kaleidoscope: shapes/shapes_kaleidoscope.c
+	$(CC) -o $@$(EXT) $< $(CFLAGS) $(INCLUDE_PATHS) $(LDFLAGS) $(LDLIBS) -D$(PLATFORM)
+
 shapes/shapes_lines_bezier: shapes/shapes_lines_bezier.c
 	$(CC) -o $@$(EXT) $< $(CFLAGS) $(INCLUDE_PATHS) $(LDFLAGS) $(LDLIBS) -D$(PLATFORM)
 

examples/README.md

@@ -17,7 +17,7 @@ You may find it easier to use than other toolchains, especially when it comes to
 - `zig build [module]` to compile all examples for a module (e.g. `zig build core`)
 - `zig build [example]` to compile _and run_ a particular example (e.g. `zig build core_basic_window`)
 
-## EXAMPLES COLLECTION [TOTAL: 174]
+## EXAMPLES COLLECTION [TOTAL: 175]
 
 ### category: core [40]
 
@@ -66,7 +66,7 @@ Examples using raylib[core](../src/rcore.c) platform functionality like window c
 | [core_undo_redo](core/core_undo_redo.c) | <img src="core/core_undo_redo.png" alt="core_undo_redo" width="80"> | ⭐⭐⭐☆ | 5.5 | 5.6 | [Ramon Santamaria](https://github.com/raysan5) |
 | [core_input_actions](core/core_input_actions.c) | <img src="core/core_input_actions.png" alt="core_input_actions" width="80"> | ⭐⭐☆☆ | 5.5 | 5.6 | [Jett](https://github.com/JettMonstersGoBoom) |
 
-### category: shapes [25]
+### category: shapes [26]
 
 Examples using raylib shapes drawing functionality, provided by raylib [shapes](../src/rshapes.c) module.
 
@@ -84,8 +84,8 @@ Examples using raylib shapes drawing functionality, provided by raylib [shapes](
 | [shapes_following_eyes](shapes/shapes_following_eyes.c) | <img src="shapes/shapes_following_eyes.png" alt="shapes_following_eyes" width="80"> | ⭐⭐☆☆ | 2.5 | 2.5 | [Ramon Santamaria](https://github.com/raysan5) |
 | [shapes_easings_ball](shapes/shapes_easings_ball.c) | <img src="shapes/shapes_easings_ball.png" alt="shapes_easings_ball" width="80"> | ⭐⭐☆☆ | 2.5 | 2.5 | [Ramon Santamaria](https://github.com/raysan5) |
 | [shapes_easings_box](shapes/shapes_easings_box.c) | <img src="shapes/shapes_easings_box.png" alt="shapes_easings_box" width="80"> | ⭐⭐☆☆ | 2.5 | 2.5 | [Ramon Santamaria](https://github.com/raysan5) |
-| [shapes_recursive_tree](shapes/shapes_recursive_tree.c) | <img src="shapes/shapes_recursive_tree.png" alt="shapes_recursive_tree" width="80"> | ⭐⭐⭐☆ | 5.6-dev | 5.6-dev| [Jopestpe](https://github.com/jopestpe) |
 | [shapes_easings_rectangles](shapes/shapes_easings_rectangles.c) | <img src="shapes/shapes_easings_rectangles.png" alt="shapes_easings_rectangles" width="80"> | ⭐⭐⭐☆ | 2.0 | 2.5 | [Ramon Santamaria](https://github.com/raysan5) |
+| [shapes_recursive_tree](shapes/shapes_recursive_tree.c) | <img src="shapes/shapes_recursive_tree.png" alt="shapes_recursive_tree" width="80"> | ⭐⭐⭐☆ | 5.6-dev | 5.6-dev | [Jopestpe](https://github.com/jopestpe) |
 | [shapes_ring_drawing](shapes/shapes_ring_drawing.c) | <img src="shapes/shapes_ring_drawing.png" alt="shapes_ring_drawing" width="80"> | ⭐⭐⭐☆ | 2.5 | 2.5 | [Vlad Adrian](https://github.com/demizdor) |
 | [shapes_circle_sector_drawing](shapes/shapes_circle_sector_drawing.c) | <img src="shapes/shapes_circle_sector_drawing.png" alt="shapes_circle_sector_drawing" width="80"> | ⭐⭐⭐☆ | 2.5 | 2.5 | [Vlad Adrian](https://github.com/demizdor) |
 | [shapes_rounded_rectangle_drawing](shapes/shapes_rounded_rectangle_drawing.c) | <img src="shapes/shapes_rounded_rectangle_drawing.png" alt="shapes_rounded_rectangle_drawing" width="80"> | ⭐⭐⭐☆ | 2.5 | 2.5 | [Vlad Adrian](https://github.com/demizdor) |
@@ -97,6 +97,7 @@ Examples using raylib shapes drawing functionality, provided by raylib [shapes](
 | [shapes_dashed_line](shapes/shapes_dashed_line.c) | <img src="shapes/shapes_dashed_line.png" alt="shapes_dashed_line" width="80"> | ⭐☆☆☆ | 5.5 | 5.5 | [Luís Almeida](https://github.com/luis605) |
 | [shapes_triangle_strip](shapes/shapes_triangle_strip.c) | <img src="shapes/shapes_triangle_strip.png" alt="shapes_triangle_strip" width="80"> | ⭐⭐☆☆ | 5.6-dev | 5.6-dev | [Jopestpe](https://github.com/jopestpe) |
 | [shapes_vector_angle](shapes/shapes_vector_angle.c) | <img src="shapes/shapes_vector_angle.png" alt="shapes_vector_angle" width="80"> | ⭐⭐☆☆ | 1.0 | 5.0 | [Ramon Santamaria](https://github.com/raysan5) |
+| [shapes_kaleidoscope](shapes/shapes_kaleidoscope.c) | <img src="shapes/shapes_kaleidoscope.png" alt="shapes_kaleidoscope" width="80"> | ⭐⭐☆☆ | 5.5 | 5.6 | [Hugo ARNAL](https://github.com/hugoarnal) |
 
 ### category: textures [26]
 

examples/examples_list.txt

@@ -181,3 +181,4 @@ others;easings_testbed;★★★☆;2.5;3.0;2019;2025;"Juan Miguel López";@flas
 others;raylib_opengl_interop;★★★★;3.8;4.0;2021;2025;"Stephan Soller";@arkanis
 others;embedded_files_loading;★★☆☆;3.0;3.5;2020;2025;"Kristian Holmgren";@defutura
 others;web_basic_window;★☆☆☆;5.6-dev;5.6-dev;2014;2025;"Ramon Santamaria";@raysan5
+shapes;shapes_kaleidoscope;★★☆☆;5.5;5.6;2025;2025;"Hugo ARNAL";@hugoarnal

examples/shapes/shapes_kaleidoscope.c

@@ -0,0 +1,92 @@
+/*******************************************************************************************
+*
+*   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 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;
+
+    Vector2 scaleVector = { 1.0f, -1.0f };
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        Vector2 mousePos = GetMousePosition();
+        Vector2 lineStart = Vector2Subtract(mousePos, offset);
+        Vector2 lineEnd = Vector2Subtract(prevMousePos, offset);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            BeginMode2D(camera);
+                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);
+
+                        Vector2 reflectLineStart = Vector2Multiply(lineStart, scaleVector);
+                        Vector2 reflectLineEnd = Vector2Multiply(lineEnd, scaleVector);
+
+                        DrawLineEx(reflectLineStart, reflectLineEnd, thickness, WHITE);
+                    }
+                }
+
+                prevMousePos = mousePos;
+            EndMode2D();
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}