GDI图像基本操作：

借鉴自：http://blog.csdn.net/harvic880925/article/details/9129011

实例：

void CMFC_GDI_TESTDlg::OnLoadImg(){// 基本变换CDC* cdc = GetWindowDC();Gdiplus::Graphics graphics(cdc->GetSafeHdc());graphics.Clear(Color(255,255,255,255));  Gdiplus::Image image(L"1.png");UINT width=image.GetWidth();  UINT height=image.GetHeight();  //原图显示graphics.TranslateTransform(0, 60);  //平移来改变图像平面坐标，使其从此坐标重新开始绘图graphics.DrawImage(&image, RectF(0, 0, width, height));//显示image，使用RectF进行缩放//缩小一半显示graphics.TranslateTransform(width+20, 0);  //平移来改变图像平面坐标，使其从此坐标重新开始绘图graphics.DrawImage(&image,RectF(0, 0,width/2, height/2)); //放大一倍显示graphics.TranslateTransform(width/2+20, 0);  graphics.DrawImage(&image,RectF(0, 0,2*width, 2*height),0,0,width,height,UnitPixel); //40,10为图像截取的宽和高，//在坐标系平移后的坐标点上，绘制大小宽为2*width,长为2*height，显示的内容是在原图width+40，height+10的基础上截取后平铺显示//使用插补模式控制图形缩放质量//高质量双三次插值法  这种方法是内存消耗最大graphics.TranslateTransform(2*width+20, 0);  graphics.SetInterpolationMode(InterpolationModeHighQualityBicubic);//高质量双三次插值法  graphics.DrawImage(&image,RectF(0,0,2*width,2*height),20,20,width/2,height/2,UnitPixel); //最临近插值法 只有这种方法会产生马赛克效果，但是资源使用最小graphics.TranslateTransform(2*width+20, 0);  graphics.SetInterpolationMode(InterpolationModeNearestNeighbor);//最临近插值法  graphics.DrawImage(&image,RectF(0,0,2*width,2*height),20,20,width/2,height/2,UnitPixel); //旋转 Matrix matrix;  //矩阵变换graphics.GetTransform(&matrix); graphics.SetTransform(&matrix);  graphics.ResetTransform();//重置坐标时序，从左上角原点开始//原图   graphics.TranslateTransform(0, 2*width+60+20);  graphics.DrawImage(&image,RectF(0, 0, width, height));//不旋转 水平翻转 graphics.TranslateTransform(width+20, 0);  image.RotateFlip(RotateNoneFlipX); //不旋转 水平翻转   graphics.DrawImage(&image,RectF(0, 0, width, height));//旋转90度 不翻转  graphics.TranslateTransform(width+20, 0);  image.RotateFlip(Rotate90FlipNone); //旋转90度不翻转  graphics.DrawImage(&image,RectF(0, 0, width, height));//旋转90度 水平翻转  graphics.TranslateTransform(width+20, 0);  image.RotateFlip(Rotate90FlipX); //旋转90度水平翻转graphics.DrawImage(&image,RectF(0, 0, width, height));//缩略图graphics.ResetTransform();//重置坐标时序，从左上角原点开始image.RotateFlip(Rotate180FlipNone); //先把原图还原，不然会使用上面变换过的图片填充，由于上面翻转过，所以使用反向翻转还原graphics.TranslateTransform(0, 2*width+60 +20 +width+20);  float shear=image.GetHeight()/image.GetWidth();//获取高/宽比，以至缩放时不变形  Image *pThumbnail=image.GetThumbnailImage(0.5*width,height,NULL,NULL);//使用0.5倍宽度*高度的原图来填充下面的椭圆TextureBrush picBrush(pThumbnail);  graphics.FillEllipse(&picBrush,RectF(0,0,400,200));  //克隆图片 是GDI+ 特有的概念 Bitmap类可以实现局部克隆和整体克隆，而Image类只能整体克隆//在这儿通过克隆 拆分图片成4部分graphics.ResetTransform();//重置坐标时序，从左上角原点开始graphics.TranslateTransform(420, 2*width+60 +20 +width+20);  Bitmap bmp(L"1.png");  INT bmpheight=bmp.GetHeight();  INT bmpwidth=bmp.GetWidth();  RectF dest[4];  dest[0]=RectF(0,   0,bmpwidth/2, bmpheight/2);  dest[1]=RectF(bmpwidth/2,  0,bmpwidth/2, bmpheight/2);  dest[2]=RectF(0,   bmpheight/2,bmpwidth/2, bmpheight/2);  dest[3]=RectF(bmpwidth/2, bmpheight/2,bmpwidth/2, bmpheight/2); Bitmap *s[4];  s[0]=bmp.Clone(dest[0],PixelFormatDontCare);//拷贝bmp图片的局部s[1]=bmp.Clone(dest[1],PixelFormatDontCare);  s[2]=bmp.Clone(dest[2],PixelFormatDontCare);  s[3]=bmp.Clone(dest[3],PixelFormatDontCare);  //绘图  graphics.DrawImage(s[0],dest[0]);  graphics.DrawImage(s[1],RectF(bmpwidth/2+10,0,bmpwidth/2,bmpheight/2));  graphics.DrawImage(s[2],RectF(0,bmpheight/2+10,bmpwidth/2,bmpheight/2));  graphics.DrawImage(s[3],RectF(bmpwidth/2+10,height/2+10,bmpwidth/2,bmpheight/2));  ReleaseDC(cdc);}void CMFC_GDI_TESTDlg::OnZoomImg(){// 投射与倾斜CDC* cdc = GetWindowDC();Gdiplus::Graphics graphics(cdc->GetSafeHdc());//投射与倾斜graphics.Clear(Color::Green);  //使用绿色来刷新背景graphics.SetInterpolationMode(InterpolationModeHighQualityBicubic);  Image img(L"1.png");  INT left=100;  INT top=200;  INT width=img.GetWidth();  INT height=img.GetHeight();  for (int x=1; x<20; x++){graphics.Clear(Color::Green);  //移动一次，刷新一次背景，使用绿色来刷新背景graphics.TranslateTransform(x, 1);  //不断变换坐标 使其呈现位移的效果//正面  PointF desFace[]={  PointF(left,top),  PointF(left+width,top),  PointF(left,top+width),  };  graphics.DrawImage(&img,desFace,3);  //上面投射  PointF destTop[]={  //投射的图像矩形的三个坐标点需要我们自己计算给出PointF(left+width/4, top-width/4),  PointF(left+width/4+width,top-width/4),  PointF(left,top)};  graphics.DrawImage(&img,destTop,3);  //侧面投射  PointF desRight[]={  PointF(left+width,top),  PointF(left+width/4+width,top-width/4),  PointF(left+width,top+width)  };  graphics.DrawImage(&img,desRight,3);  Sleep(300);}ReleaseDC(cdc);}void CMFC_GDI_TESTDlg::OnReduceImg(){// 色彩变换CDC* cdc = GetWindowDC();Gdiplus::Graphics graphics(cdc->GetSafeHdc());graphics.TranslateTransform(0, 60);  //平移来改变图像平面坐标，使其从此坐标重新开始绘图graphics.Clear(Color(255,255,255,255));  Image img(L"1.png");  int width=img.GetWidth();int height=img.GetHeight();//原图graphics.DrawImage(&img,RectF(0,0,width,height));//应用色彩变换graphics.TranslateTransform(width+10,0);ColorMatrix colorMatrix={//色彩矩阵0.0f,1.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f,0.0f,0.0f,0.0f,1.0f};ImageAttributes imgattr;//使用上面色彩矩阵绘图imgattr.SetColorMatrix(&colorMatrix,ColorMatrixFlagsDefault,ColorAdjustTypeBitmap);graphics.DrawImage(&img,RectF(0,0,img.GetWidth(),img.GetHeight()),0,0,img.GetWidth(),img.GetHeight(),UnitPixel,&imgattr);//临时清除对图像色彩的变换imgattr.SetNoOp(ColorAdjustTypeBitmap);graphics.TranslateTransform(width+10,0);graphics.DrawImage(&img,RectF(0,0,img.GetWidth(),img.GetHeight()),0,0,img.GetWidth(),img.GetHeight(),UnitPixel,&imgattr);//撤销的上面的清除操作imgattr.ClearNoOp(ColorAdjustTypeBitmap);graphics.TranslateTransform(width+10,0);graphics.DrawImage(&img,RectF(0,0,img.GetWidth(),img.GetHeight()),0,0,img.GetWidth(),img.GetHeight(),UnitPixel,&imgattr);ReleaseDC(cdc);}void CMFC_GDI_TESTDlg::OnSpinImg(){// 设置透明色范围，可用于范围抠图CDC* cdc = GetWindowDC();Gdiplus::Graphics graphics(cdc->GetSafeHdc());graphics.TranslateTransform(0, 60);  //平移来改变图像平面坐标，使其从此坐标重新开始绘图graphics.Clear(Color(255,0,255,0));  Image img(L"2.png");//绘制原图graphics.DrawImage(&img,RectF(0,0,img.GetWidth(),img.GetHeight()));//设置透明色范围graphics.TranslateTransform(img.GetWidth()+10,0);ImageAttributes imgAttributes;imgAttributes.SetColorKey(Color(0,100,200,200),Color(0,255,255,255),ColorAdjustTypeBitmap);graphics.DrawImage(&img,RectF(0,0,img.GetWidth(),img.GetHeight()),0,0,img.GetWidth(),img.GetHeight(),UnitPixel,&imgAttributes);ReleaseDC(cdc);}

实际效果：