GDI+

GDI+ from C++ windows basic example

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;

#pragma comment( lib, "gdiplus.lib" )

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow)
{
  // attach a console
  AllocConsole() ;
  AttachConsole( GetCurrentProcessId() ) ;
  freopen( "CON", "w", stdout ) ;

  // Start up GDI+.
  GdiplusStartupInput gdiplusStartupInput;
  ULONG_PTR gdiplusToken;
  GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

  WNDCLASS wndClass;
  wndClass.style          = CS_HREDRAW | CS_VREDRAW;
  wndClass.lpfnWndProc    = WndProc;
  wndClass.cbClsExtra     = 0;
  wndClass.cbWndExtra     = 0;
  wndClass.hInstance      = hInstance;
  wndClass.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
  wndClass.hCursor        = LoadCursor(NULL, IDC_ARROW);
  wndClass.hbrBackground  = (HBRUSH)GetStockObject(WHITE_BRUSH);
  wndClass.lpszMenuName   = NULL;
  wndClass.lpszClassName  = TEXT("GDIPLUSWINDOW");

  if(!RegisterClass(&wndClass)){ puts( "problem registering wndclass" ) ; }

  HWND hWnd;
  hWnd = CreateWindow(
    TEXT("GDIPLUSWINDOW"),   // window class name
    TEXT("Welcome to GDI+!"),  // window caption
    WS_OVERLAPPEDWINDOW,      // window style
    20,            // initial x position
    20,            // initial y position
    640,            // initial width
    480,            // initial height
    NULL,                     // parent window handle
    NULL,                     // window menu handle
    hInstance,                // program instance handle
    NULL);                    // creation parameters

  ShowWindow(hWnd, iCmdShow);
  UpdateWindow(hWnd);

  MSG msg;
  while(GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }

  GdiplusShutdown(gdiplusToken);
  return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message,
                         WPARAM wParam, LPARAM lParam)
{
  HDC hdc;
  PAINTSTRUCT ps;

  switch(message)
  {
  case WM_PAINT:
    {
      // "Start painting"
      // The HDC "handle to a device context"
      // is the 'surface' on which you draw.
      // You don't draw directly to a window.
      // Rather you draw to a "device context".
      // The reason its this way is it makes it so
      // you can draw to ANY SURFACE
      hdc = BeginPaint(hWnd, &ps);

      #pragma region painting code
      // Create a Graphics object for our window's hdc
      Graphics g( hdc ) ;

      // Create a pen.
      Pen bluePen( Color( 128, 0, 0, 255 ) ) ;
      bluePen.SetWidth( 8.0 ) ;

      g.DrawLine( &bluePen, 0, 0, 100, 100 ) ;
      g.DrawEllipse( &bluePen, 0, 0, 40, 40 ) ;
      g.DrawEllipse( &bluePen, 0, 0, 50, 50 ) ;

      SolidBrush blueBrush( Color( 120, 0, 0, 255 ) ) ;
      g.FillRectangle( &blueBrush, 60, 60, 190, 180 ) ;

      SolidBrush redBrush( Color( 123, 255, 0, 0 ) ) ;
      Font arialFont( TEXT("Arial"), 12.0 ) ;
      PointF pTextPos( 20, 20 ); 

      g.DrawString( TEXT("This is GDI+!"),
                 strlen( "This is GDI+!" ),
                 &arialFont, pTextPos, &redBrush ) ;
      g.FillRectangle( &redBrush, 30, 30, 100, 180 ) ;

      #pragma endregion

      // "Wrap it up"
      EndPaint( hWnd, &ps );
      printf( "Your window has been painted\n" ) ;
    }
    return 0;
  case WM_LBUTTONDOWN:
    {
      UpdateWindow(hWnd);
    }
    break;
  case WM_DESTROY:
    PostQuitMessage(0);
    return 0;
  default:
    return DefWindowProc(hWnd, message, wParam, lParam);
  }
} // WndProc

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