#include "stdafx.h"
#include "CPictureCtrl.h"
BEGIN_MESSAGE_MAP(CPictureCtrl, CStatic)
    //{{AFX_MSG_MAP(CPictureCtrl)
	ON_WM_DRAWITEM()
    ON_WM_PAINT()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()


void CPictureCtrl::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
    CStatic::OnDrawItem(nIDCtl, lpDrawItemStruct);
    return;
    /*
    CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    CRect rect;
    GetClientRect(&rect);

    if (m_pBitmap)
    {
        Graphics graphics(pDC->m_hDC);
        graphics.SetInterpolationMode(InterpolationModeHighQualityBicubic); // 设置高质量缩放

        int imageWidth = m_pBitmap->GetWidth();
        int imageHeight = m_pBitmap->GetHeight();

        float scaleX = static_cast<float>(rect.Width()) / imageWidth;
        float scaleY = static_cast<float>(rect.Height()) / imageHeight;
        float scale = min(scaleX, scaleY);
        int scaledWidth = static_cast<int>(imageWidth * scale);
        int scaledHeight = static_cast<int>(imageHeight * scale);

        int xPos = (rect.Width() - scaledWidth) / 2;
        int yPos = (rect.Height() - scaledHeight) / 2;

        graphics.DrawImage(m_pBitmap, xPos, yPos, scaledWidth, scaledHeight);
    }
    */

}

CPictureCtrl::CPictureCtrl() : 
    m_gdiplusToken(0), 
    m_pBitmap(NULL)
{

    // 初始化GDI+
    GdiplusStartupInput gdiplusStartupInput;
    GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);

}

CPictureCtrl::~CPictureCtrl() 
{
    FreeData(); 

    // 关闭GDI+
    GdiplusShutdown(m_gdiplusToken);
}

BOOL CPictureCtrl::LoadFromStream(IStream* piStream)
{
    FreeData();
    m_pBitmap = Bitmap::FromStream(piStream);
    return m_pBitmap != NULL;
}

BOOL CPictureCtrl::LoadFromReSource(DWORD dwID)
{
    FreeData();



    //加载位图资源
     HBITMAP hBitmap = LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(dwID));
     if (hBitmap)
     {
         // 创建GDI+ Bitmap对象
         m_pBitmap = Bitmap::FromHBITMAP(hBitmap, NULL);

         // 释放资源
         DeleteObject(hBitmap);
     }


    return m_pBitmap != NULL;
}

void CPictureCtrl::FreeData()
{

    if (m_pBitmap)
    {
        delete m_pBitmap;
        m_pBitmap = NULL;
    }
}


void CPictureCtrl::OnPaint()
{
    CPaintDC dc(this); // device context for painting


    CDC* pDC = CDC::FromHandle(dc.GetSafeHdc());
    CRect rect;
    GetClientRect(&rect);

    if (m_pBitmap)
    {
        Graphics graphics(pDC->m_hDC);
        graphics.SetInterpolationMode(InterpolationModeHighQualityBicubic); // 设置高质量缩放

        int imageWidth = m_pBitmap->GetWidth();
        int imageHeight = m_pBitmap->GetHeight();

        float scaleX = static_cast<float>(rect.Width()) / imageWidth;
        float scaleY = static_cast<float>(rect.Height()) / imageHeight;
        float scale = min(scaleX, scaleY);
        int scaledWidth = static_cast<int>(imageWidth * scale);
        int scaledHeight = static_cast<int>(imageHeight * scale);

        int xPos = (rect.Width() - scaledWidth) / 2;
        int yPos = (rect.Height() - scaledHeight) / 2;

        //保持比例显示
        graphics.DrawImage(m_pBitmap, xPos, yPos, scaledWidth, scaledHeight);
    }


}