Review some examples

examples/core/core_input_multitouch.c

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+/*******************************************************************************************
+*
+*   raylib [core] example - Input multitouch
+*
+*   This example has been created using raylib 2.1 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Berni and Ramon Santamaria (@raysan5) 
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - input multitouch");
+
+    Vector2 ballPosition = { -100.0f, -100.0f };
+    Color ballColor = BEIGE;
+    
+    int touchCounter = 0;
+    Vector2 touchPosition;
+
+    SetTargetFPS(60);
+    //---------------------------------------------------------------------------------------
+  
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        ballPosition = GetMousePosition();
+        
+        ballColor = BEIGE;
+
+        if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) ballColor = MAROON;
+        if (IsMouseButtonDown(MOUSE_MIDDLE_BUTTON)) ballColor = LIME;
+        if (IsMouseButtonDown(MOUSE_RIGHT_BUTTON)) ballColor = DARKBLUE;
+
+        if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) touchCounter = 10;
+        if (IsMouseButtonPressed(MOUSE_MIDDLE_BUTTON)) touchCounter = 10;
+        if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) touchCounter = 10;
+        
+        if (touchCounter > 0) touchCounter--;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            // Multitouch
+            for (int i = 0; i < MAX_TOUCH_POINTS; ++i)
+            {              
+                touchPosition = GetTouchPosition(i);                    // Get the touch point
+                
+                if ((touchPosition.x >= 0) && (touchPosition.y >= 0))   // Make sure point is not (-1,-1) as this means there is no touch for it
+                {
+                    // Draw circle and touch index number
+                    DrawCircleV(touchPosition, 34, ORANGE);
+                    DrawText(FormatText("%d", i), touchPosition.x - 10, touchPosition.y - 70, 40, BLACK);
+                } 
+            }
+
+            // Draw the normal mouse location
+            DrawCircleV(ballPosition, 30 + (touchCounter*3), ballColor);
+
+            DrawText("move ball with mouse and click mouse button to change color", 10, 10, 20, DARKGRAY);
+            DrawText("touch the screen at multiple locations to get multiple balls", 10, 30, 20, DARKGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}