已知 GDI+ 可以支持的图像格式: BMP、JPEG、GIF、TIFF、PNG、ICO、WMF、EMF

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TGPGraphics.DrawImage 函数有太多重载了, 一起列在这吧:

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function DrawImage(image: TGPImage; const point: TGPPointF): TStatus; overload;function DrawImage(image: TGPImage; x, y: Single): TStatus; overload;function DrawImage(image: TGPImage; const rect: TGPRectF): TStatus; overload;function DrawImage(image: TGPImage; x, y, width, height: Single): TStatus; overload;function DrawImage(image: TGPImage; const point: TGPPoint): TStatus; overload;function DrawImage(image: TGPImage; x, y: Integer): TStatus; overload;function DrawImage(image: TGPImage; const rect: TGPRect): TStatus; overload;function DrawImage(image: TGPImage; x, y, width, height: Integer): TStatus; overload;function DrawImage(image: TGPImage; destPoints: PGPPointF; count: Integer): TStatus; overload;function DrawImage(image: TGPImage; destPoints: PGPPoint; count: Integer): TStatus; overload;function DrawImage(image: TGPImage;x, y, srcx, srcy, srcwidth, srcheight: Single;srcUnit: TUnit
): TStatus; overload;function DrawImage(image: TGPImage; const destRect: TGPRectF;srcx, srcy, srcwidth, srcheight: Single;srcUnit: TUnit;imageAttributes: TGPImageAttributes = nil;callback: DrawImageAbort = nil;callbackData: Pointer = nil
): TStatus; overload;function DrawImage(image: TGPImage;destPoints: PGPPointF;count: Integer;srcx, srcy, srcwidth, srcheight: Single;srcUnit: TUnit;imageAttributes: TGPImageAttributes = nil;callback: DrawImageAbort = nil;callbackData: Pointer = nil
): TStatus; overload;function DrawImage(image: TGPImage; x, y, srcx, srcy, srcwidth, srcheight: Integer;srcUnit: TUnit
): TStatus; overload;function DrawImage(image: TGPImage;const destRect: TGPRect;srcx, srcy, srcwidth, srcheight: Integer;srcUnit: TUnit;imageAttributes: TGPImageAttributes = nil;callback: DrawImageAbort = nil;callbackData: Pointer = nil
): TStatus; overload;function DrawImage(image: TGPImage;destPoints: PGPPoint;count, srcx, srcy, srcwidth, srcheight: Integer;srcUnit: TUnit;imageAttributes: TGPImageAttributes = nil;callback: DrawImageAbort = nil;callbackData: Pointer = nil
): TStatus; overload;

本例效果图:

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代码文件:

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unit Unit1;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs;typeTForm1 = class(TForm)procedure FormPaint(Sender: TObject);end;varForm1: TForm1;implementation{$R *.dfm}uses GDIPOBJ, GDIPAPI;procedure TForm1.FormPaint(Sender: TObject);
varg: TGPGraphics;img: TGPImage;
beging := TGPGraphics.Create(Self.Canvas.Handle);img := TGPImage.Create('C:\temp\test.jpg');g.DrawImage(img, 0, 0, img.GetWidth, img.GetHeight);img.Free;g.Free;
end;end.

窗体文件:

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object Form1: TForm1Left = 0Top = 0Caption = 'Form1'ClientHeight = 290ClientWidth = 355Color = clBtnFaceFont.Charset = DEFAULT_CHARSETFont.Color = clWindowTextFont.Height = -11Font.Name = 'Tahoma'Font.Style = []OldCreateOrder = FalseOnPaint = FormPaintPixelsPerInch = 96TextHeight = 13
end