Batch of 9 new shapes examples!

Some examples included in this batch require the included libraries: `easings.h` and `raygui.h`. Examples included:

 - shapes_bouncing_ball
 - shapes_collision_area
 - shapes_following_eyes
 - shapes_draw_circle_sector (requires raygui.h)
 - shapes_draw_rectangle_rounded (requires raygui.h)
 - shapes_draw_ring (requires raygui.h)
 - shapes_easings_ball_anim (requires easings.h)
 - shapes_easings_box_anim (requires easings.h)
 - shapes_easings_rectangle_array (requires easings.h)

examples/shapes/shapes_collision_area.c

@@ -0,0 +1,108 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - collision area
+*
+*   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)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include <stdlib.h>     // Required for abs()
+
+int main()
+{
+    // Initialization
+    //---------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - collision area");
+    
+    // Box A: Moving box
+    Rectangle boxA = { 10, GetScreenHeight()/2 - 50, 200, 100 };
+	int boxASpeedX = 4;
+	
+    // Box B: Mouse moved box
+    Rectangle boxB = { GetScreenWidth()/2 - 30, GetScreenHeight()/2 - 30, 60, 60 };
+    
+    Rectangle boxCollision = { 0 };       // Collision rectangle
+    
+    int screenUpperLimit = 40;      // Top menu limits
+    
+	bool pause = false;             // Movement pause
+	bool collision = false;         // Collision detection
+    
+    SetTargetFPS(60);
+    //----------------------------------------------------------
+    
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //-----------------------------------------------------
+        // Move box if not paused
+		if (!pause) boxA.x += boxASpeedX;
+        
+        // Bounce box on x screen limits
+		if (((boxA.x + boxA.width) >= GetScreenWidth()) || (boxA.x <= 0)) boxASpeedX *= -1;
+		
+		// Update player-controlled-box (box02)
+		boxB.x = GetMouseX() - boxB.width/2;
+		boxB.y = GetMouseY() - boxB.height/2;
+		
+        // Make sure Box B does not go out of move area limits
+		if ((boxB.x + boxB.width) >= GetScreenWidth()) boxB.x = GetScreenWidth() - boxB.width;
+		else if (boxB.x <= 0) boxB.x = 0;
+		
+		if ((boxB.y + boxB.height) >= GetScreenHeight()) boxB.y = GetScreenHeight() - boxB.height;
+		else if (boxB.y <= screenUpperLimit) boxB.y = screenUpperLimit;
+        
+        // Check boxes collision
+        collision = CheckCollisionRecs(boxA, boxB);
+		
+		// Get collision rectangle (only on collision)
+		if (collision) boxCollision = GetCollisionRec(boxA, boxB);
+		
+        // Pause Box A movement
+		if (IsKeyPressed(KEY_SPACE)) pause = !pause;
+        //-----------------------------------------------------
+        
+        // Draw
+        //-----------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+            
+            DrawRectangle(0, 0, screenWidth, screenUpperLimit, collision? RED : BLACK);
+
+            DrawRectangleRec(boxA, GOLD);
+            DrawRectangleRec(boxB, BLUE);
+            
+            if (collision)
+            {
+                // Draw collision area
+                DrawRectangleRec(boxCollision, LIME);
+                
+                // Draw collision message
+                DrawText("COLLISION!", GetScreenWidth()/2 - MeasureText("COLLISION!", 20)/2, screenUpperLimit/2 - 10, 20, BLACK);
+                
+                // Draw collision area
+                DrawText(FormatText("Collision Area: %i", (int)boxCollision.width*(int)boxCollision.height), GetScreenWidth()/2 - 100, screenUpperLimit + 10, 20, BLACK);
+            }     
+
+            DrawFPS(10, 10);
+        
+        EndDrawing();
+        //-----------------------------------------------------
+    }
+
+    // De-Initialization
+    //---------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //----------------------------------------------------------
+    
+    return 0;
+}