VC中使用GDI+库，实现图片旋转

#include "MainDlg.h" BEGIN_MESSAGE_MAP(MainDlg, CDialog) ON_WM_PAINT() ON_WM_ERASEBKGND() ON_WM_TIMER() END_MESSAGE_MAP() MainDlg::MainDlg() : CDialog(IDD_DLG,NULL){ this->angle=0; } void MainDlg::OnPaint() { CPaintDC dc(this); // device context for painting Image im(L"1.png"); CDC dcmem; dcmem.CreateCompatibleDC(&dc); //dcmem.SetGraphicsMode(GM_ADVANCED); CBitmap bk; bk.CreateCompatibleBitmap(&dc,800,800); dcmem.SelectObject(&bk); dcmem.FillRect(CRect(0,0,500,500),&CBrush(RGB(255,255,255))); dcmem.Rectangle(10,10,13,13); Graphics g(dcmem.GetSafeHdc()); /*CPen pen; pen.CreatePen(PS_SOLID,1,RGB(0,0,0));*/ COLORREF crRef = RGB( 0, 0, 0); Color color; color.SetFromCOLORREF(crRef); Pen pen(color,1 ); //g.SetInterpolationMode(InterpolationModeNearestNeighbor); g.DrawRectangle(&pen,0,0,1,1); //g.SetSmoothingMode(SmoothingModeAntiAlias); g.TranslateTransform(200,200); g.RotateTransform(this->angle); //g.DrawImage(&im,-10,-10); //g.DrawImage(&im,(-im.GetWidth()/2),(-im.GetHeight()/2)); int w=im.GetWidth(); int h=im.GetHeight(); g.DrawImage(&im,-100,-100,200,200); Point point1(-100,0); Point point2(100,0); Point point3(0,-100); Point point4(0,100); g.DrawLine(&pen,point1,point2); g.DrawLine(&pen,point3,point4); //g.SetPixelOffsetMode dc.BitBlt(0,0,500,500,&dcmem,0,0,SRCCOPY); } BOOL MainDlg::OnEraseBkgnd(CDC* pDC) { // TODO: 在此添加消息处理程序代码和/或调用默认值 return TRUE; } void MainDlg::OnTimer(UINT_PTR nIDEvent) { // TODO: 在此添加消息处理程序代码和/或调用默认值 CDialog::OnTimer(nIDEvent); if(nIDEvent==1000){ //::MessageBeep(5); this->angle=this->angle+10; this->Invalidate(true); } } BOOL MainDlg::OnInitDialog() { CDialog::OnInitDialog(); this->SetTimer(1000,2,NULL); return TRUE; // return TRUE unless you set the focus to a control }