Update/merge examples back into main repo (#192)

Examples/Shapes/FollowingEyes.cs

@@ -0,0 +1,108 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - following eyes
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2013-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System;
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Shapes;
+
+public class FollowingEyes
+{
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - following eyes");
+
+        Vector2 scleraLeftPosition = new(GetScreenWidth() / 2 - 100, GetScreenHeight() / 2);
+        Vector2 scleraRightPosition = new(GetScreenWidth() / 2 + 100, GetScreenHeight() / 2);
+        float scleraRadius = 80;
+
+        Vector2 irisLeftPosition = new(GetScreenWidth() / 2 - 100, GetScreenHeight() / 2);
+        Vector2 irisRightPosition = new(GetScreenWidth() / 2 + 100, GetScreenHeight() / 2);
+        float irisRadius = 24;
+
+        float angle = 0.0f;
+        float dx = 0.0f, dy = 0.0f, dxx = 0.0f, dyy = 0.0f;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            irisLeftPosition = GetMousePosition();
+            irisRightPosition = GetMousePosition();
+
+            // Check not inside the left eye sclera
+            if (!CheckCollisionPointCircle(irisLeftPosition, scleraLeftPosition, scleraRadius - 20))
+            {
+                dx = irisLeftPosition.X - scleraLeftPosition.X;
+                dy = irisLeftPosition.Y - scleraLeftPosition.Y;
+
+                angle = MathF.Atan2(dy, dx);
+
+                dxx = (scleraRadius - irisRadius) * MathF.Cos(angle);
+                dyy = (scleraRadius - irisRadius) * MathF.Sin(angle);
+
+                irisLeftPosition.X = scleraLeftPosition.X + dxx;
+                irisLeftPosition.Y = scleraLeftPosition.Y + dyy;
+            }
+
+            // Check not inside the right eye sclera
+            if (!CheckCollisionPointCircle(irisRightPosition, scleraRightPosition, scleraRadius - 20))
+            {
+                dx = irisRightPosition.X - scleraRightPosition.X;
+                dy = irisRightPosition.Y - scleraRightPosition.Y;
+
+                angle = MathF.Atan2(dy, dx);
+
+                dxx = (scleraRadius - irisRadius) * MathF.Cos(angle);
+                dyy = (scleraRadius - irisRadius) * MathF.Sin(angle);
+
+                irisRightPosition.X = scleraRightPosition.X + dxx;
+                irisRightPosition.Y = scleraRightPosition.Y + dyy;
+            }
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            DrawCircleV(scleraLeftPosition, scleraRadius, Color.LIGHTGRAY);
+            DrawCircleV(irisLeftPosition, irisRadius, Color.BROWN);
+            DrawCircleV(irisLeftPosition, 10, Color.BLACK);
+
+            DrawCircleV(scleraRightPosition, scleraRadius, Color.LIGHTGRAY);
+            DrawCircleV(irisRightPosition, irisRadius, Color.DARKGREEN);
+            DrawCircleV(irisRightPosition, 10, Color.BLACK);
+
+            DrawFPS(10, 10);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}