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Direct2Dで四角形の描画を行う

Direct2Dで四角形の描画を行うには、ID2D1HwndRenderTarget::DrawRectangle()メソッドを呼び出します。 四角形はブラシで描画されますので、好きな色でブラシを生成しておきます。DrawRectangle()メソッドでは線の幅も指定できます。

Direct2Dで四角形の描画を行う
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#include <stdio.h>
#include <tchar.h>
#include <locale.h>
#include <iostream>
#include <windows.h>
#include <d2d1.h>
#include <wincodec.h>
#include <wincodecsdk.h>
 
 
 
// lib
#pragma comment( lib, "d2d1.lib" )
#pragma comment( lib, "WindowsCodecs.lib" )
 
 
 
/*
    メインウインドウイベント処理
*/
LRESULT CALLBACK eMainWindowProc(
      HWND   hwnd   // handle to window
    , UINT   uMsg   // message identifier
    , WPARAM wParam // first message parameter
    , LPARAM lParam // second message parameter
);
 
 
 
// グローバル変数
ID2D1Factory* pD2d1Factory = NULL;
ID2D1HwndRenderTarget* pRenderTarget = NULL;
 
 
 
/*
    Direct2Dで四角形を描画する
*/
int _tmain
(
      int argc
    , _TCHAR* argv[]
)
{
    // std::wcoutのロケールを設定
    std::wcout.imbue( std::locale( "", std::locale::ctype ) );
 
    // COM初期化
    ::CoInitialize( NULL );
 
    WNDCLASSEX tWndClass;
    HINSTANCE  hInstance;
    TCHAR*     cpClassName;
    TCHAR*     cpWindowName;
    TCHAR*     cpMenu;
    HWND       hWnd;
    MSG        tMsg;
 
 
    // アプリケーションインスタンス
    hInstance    = ::GetModuleHandle( NULL );
 
    // クラス名称
    cpClassName  = _T("MainWindowClass");
 
    // メニュー
    cpMenu       = MAKEINTRESOURCE( NULL );
 
    // ウインドウ名称
    cpWindowName = _T("Direct2Dで四角形を描画");
 
    // ウインドウクラスパラメータセット
    tWndClass.cbSize        = sizeof( WNDCLASSEX );
    tWndClass.style         = CS_HREDRAW | CS_VREDRAW;
    tWndClass.lpfnWndProc   = eMainWindowProc;
    tWndClass.cbClsExtra    = 0;    // ::GetClassLong で取得可能なメモリ
    tWndClass.cbWndExtra    = 0;    // ::GetWindowLong で取得可能なメモリ
    tWndClass.hInstance     = hInstance;
    tWndClass.hIcon         = ::LoadIcon( NULL, IDI_APPLICATION );
    tWndClass.hCursor       = ::LoadCursor( NULL, IDC_ARROW );
    tWndClass.hbrBackground = (HBRUSH)( COLOR_WINDOW + 1 );
    tWndClass.lpszMenuName  = cpMenu;
    tWndClass.lpszClassName = cpClassName;
    tWndClass.hIconSm       = NULL;
 
    // ウインドウクラス生成
    if ( 0 == ::RegisterClassEx( &tWndClass ) ) {
 
        /* 失敗 */
        return( -1 );
    }
 
    // ウインドウを生成する
    hWnd = ::CreateWindowEx (
          0                       // extended window style
        , tWndClass.lpszClassName // pointer to registered class name
        , cpWindowName            // pointer to window name
        , WS_OVERLAPPEDWINDOW     // window style
        , CW_USEDEFAULT           // horizontal position of window
        , CW_USEDEFAULT           // vertical position of window
        , 640                     // window width
        , 480                     // window height
        , NULL                    // handle to parent or owner window
        , NULL                    // handle to menu, or child-window identifier
        , hInstance               // handle to application instance
        , (VOID*)0x12345678       // pointer to window-creation data
    );
 
 
    /*
        メッセージループ
    */
    while( 0 != ::GetMessage( &tMsg, NULL, 0, 0 ) ) {
        ::TranslateMessage ( &tMsg );
        ::DispatchMessage ( &tMsg );
    }
 
    // COM初期化
    ::CoUninitialize();
 
    // WM_QUITの終了コードを返却する
    return( tMsg.wParam );
}
 
 
 
/*
    メインウインドウイベント処理
*/
LRESULT CALLBACK eMainWindowProc
(
      HWND   hWnd   // handle to window
    , UINT   uMsg   // message identifier
    , WPARAM wParam // first message parameter
    , LPARAM lParam // second message parameter
)
{
    switch( uMsg ) {
    case WM_CREATE:
    //--------------------------------------------
    // WM_CREATE
    //--------------------------------------------
        {
            CREATESTRUCT* tpCreateSt = (CREATESTRUCT*)lParam;
 
            /* パラメータ表示 */
            wprintf(
                L"CREATESTRUCT¥n"
                L"¥tlpCreateParams = 0x%08x¥n"
                L"¥thInstance      = 0x%08x¥n"
                L"¥thMenu          = 0x%08x¥n"
                L"¥thwndParent     = 0x%08x¥n"
                L"¥tcy             = %d¥n"
                L"¥tcx             = %d¥n"
                L"¥ty              = %d¥n"
                L"¥tx              = %d¥n"
                L"¥tstyle          = 0x%08x¥n"
                L"¥tlpszName       = ¥"%s¥"¥n"
                L"¥tlpszClass      = ¥"%s¥"¥n"
                L"¥tdwExStyle      = 0x%08x¥n"
                , tpCreateSt->lpCreateParams
                , tpCreateSt->hInstance
                , tpCreateSt->hMenu
                , tpCreateSt->hwndParent
                , tpCreateSt->cy
                , tpCreateSt->cx
                , tpCreateSt->y
                , tpCreateSt->x
                , tpCreateSt->style
                , tpCreateSt->lpszName
                , tpCreateSt->lpszClass
                , tpCreateSt->dwExStyle
            );
 
            HRESULT hResult = S_OK;
 
 
            /*
                ID2D1Factoryの生成
            */
            hResult = ::D2D1CreateFactory( D2D1_FACTORY_TYPE_MULTI_THREADED, &pD2d1Factory );
            if ( FAILED( hResult ) ) {
 
                // エラー
                std::wcout << L"D2D1CreateFactory失敗" << std::endl;
                break;
            }
 
 
            /*
                ID2D1HwndRenderTargetの生成
            */
            {
                D2D1_SIZE_U oPixelSize = {
                      tpCreateSt->cx
                    , tpCreateSt->cy
                };
 
                D2D1_RENDER_TARGET_PROPERTIES oRenderTargetProperties = D2D1::RenderTargetProperties();
 
                D2D1_HWND_RENDER_TARGET_PROPERTIES oHwndRenderTargetProperties = D2D1::HwndRenderTargetProperties( hWnd, oPixelSize );
 
 
                /*
                    ID2D1HwndRenderTargetの生成
                */
                hResult = pD2d1Factory->CreateHwndRenderTarget(
                          oRenderTargetProperties
                        , oHwndRenderTargetProperties
                        , &pRenderTarget
                    );
                if ( FAILED( hResult ) ) {
 
                    // エラー
                    std::wcout << L"CreateHwndRenderTarget失敗" << std::endl;
                    break;
                }
            }
 
            // ウインドウを表示する
            ::ShowWindow( hWnd, SW_SHOW );
        }
        break;
 
 
    case WM_DESTROY:
    //--------------------------------------------
    // WM_DESTROY
    //--------------------------------------------
        {
            // ID2D1HwndRenderTargetの破棄
            if ( NULL != pRenderTarget )  {
                pRenderTarget->Release();
            }
 
            // ID2D1Factoryの破棄
            if ( NULL != pD2d1Factory )  {
                pD2d1Factory->Release();
            }
 
            // 終了する( 引数はそのまま終了コードとなります )
            ::PostQuitMessage( 0 );
        }
        break;
 
 
    case WM_SIZE:
    //--------------------------------------------
    // WM_SIZE
    //--------------------------------------------
        {
            D2D1_SIZE_U oPixelSize = { LOWORD( lParam ), HIWORD( lParam ) };
 
            // ターゲットリサイズ
            pRenderTarget->Resize( &oPixelSize );
        }
        break;
 
 
    case WM_ERASEBKGND:
    //--------------------------------------------
    // WM_ERASEBKGND
    //--------------------------------------------
        {
            ;
        }
        return( TRUE );
 
 
    case WM_PAINT:
    //--------------------------------------------
    // WM_PAINT
    //--------------------------------------------
        {
            HRESULT hResult = S_OK;
 
            // ターゲットサイズの取得
            D2D1_SIZE_F oTargetSize = pRenderTarget->GetSize();
 
            // 描画開始
            PAINTSTRUCT tPaintStruct;
            ::BeginPaint( hWnd, &tPaintStruct );
 
            // 描画開始(Direct2D)
            pRenderTarget->BeginDraw();
 
            // 背景のクリア
            D2D1_COLOR_F oBKColor = { 1.0f, 1.0f, 1.0f, 1.0f };
            pRenderTarget->Clear( oBKColor );
 
 
 
            /*
                四角形の描画
            */
            {
                for ( int nI = 0; nI < oTargetSize.height; nI += 10 ) {
 
                    // ブラシの生成
                    ID2D1SolidColorBrush* pBrush = NULL;
                    {
                        pRenderTarget->CreateSolidColorBrush(
                                  D2D1::ColorF(
                                          (float)( nI / ( oTargetSize.height ) )        // R
                                        , 0.0f                                          // G
                                        , 0.0f                                          // B
                                        , 1.0f                                          // A
                                    )
                                , &pBrush
                            );
                    }
 
                    if ( NULL != pBrush ) {
 
                        // 中心
                        D2D1_POINT_2F tCenter = D2D1::Point2F(
                                  oTargetSize.width  / 2
                                , oTargetSize.height / 2
                            );
 
                        // 描画矩形
                        D2D1_RECT_F tRectF = D2D1::RectF(
                                  (float)( tCenter.x - nI )
                                , (float)( tCenter.y - nI )
                                , (float)( tCenter.x + nI )
                                , (float)( tCenter.y + nI )
                            );
 
 
                        // 線の幅
                        float fStrokeWidth = (float)( ( nI / 10 ) % 3 + 1 );
 
                        // 四角形の描画
                        pRenderTarget->DrawRectangle( &tRectF, pBrush, fStrokeWidth );
 
                        // ブラシの破棄
                        pBrush->Release();
                    }
                }
            }
 
            // 描画終了(Direct2D)
            pRenderTarget->EndDraw();
 
            // 描画終了
            ::EndPaint( hWnd, &tPaintStruct );
        }
        return( FALSE );
    }
 
    // デフォルト処理呼び出し
    return ::DefWindowProc( hWnd, uMsg, wParam, lParam );
}

実行結果







わびさびサンプルソース

WindowsやHTML5などのプログラムのサンプルコードやフリーソフトを提供します。