Review examples

examples/portable_window/portable_window.c

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+/*******************************************************************************************
+*
+*   raygui - portable window
+*
+*   DEPENDENCIES:
+*       raylib 2.1  - Windowing/input management and drawing.
+*       raygui 2.0  - Immediate-mode GUI controls.
+*
+*   COMPILATION (Windows - MinGW):
+*       gcc -o $(NAME_PART).exe $(FILE_NAME) -I../../src -lraylib -lopengl32 -lgdi32 -std=c99
+*
+*   LICENSE: zlib/libpng
+*
+*   Copyright (c) 2018 raylib technologies (@raylibtech)
+*
+**********************************************************************************************/
+
+#include "raylib.h"
+
+#define RAYGUI_IMPLEMENTATION
+#include "raygui.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main()
+{
+    // Initialization
+    //---------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 600;
+    
+    SetConfigFlags(FLAG_WINDOW_UNDECORATED);
+    InitWindow(screenWidth, screenHeight, "raygui - portable window");
+
+    // General variables
+    Vector2 mousePosition = { 0 };
+    Vector2 windowPosition = { 500, 200 };
+    Vector2 panOffset = mousePosition;
+    bool dragWindow = false;
+    
+    SetWindowPosition(windowPosition.x, windowPosition.y);
+    
+    bool exitWindow = false;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!exitWindow && !WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        mousePosition = GetMousePosition();
+        
+        if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON))
+        {
+            if (CheckCollisionPointRec(mousePosition, (Rectangle){ 0, 0, screenWidth, 20 }))
+            {
+                dragWindow = true;
+                panOffset = mousePosition;
+            }
+        }
+
+        if (dragWindow)
+        {            
+            windowPosition.x += (mousePosition.x - panOffset.x);
+            windowPosition.y += (mousePosition.y - panOffset.y);
+            
+            if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) dragWindow = false;
+
+            SetWindowPosition(windowPosition.x, windowPosition.y);
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            exitWindow = GuiWindowBox((Rectangle){ 0, 0, screenWidth, screenHeight }, "PORTABLE WINDOW");
+            
+            DrawText(FormatText("Mouse Position: [ %.0f, %.0f ]", mousePosition.x, mousePosition.y), 10, 40, 10, DARKGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}