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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[81]: TGPImage(1) - 顯示圖像

再學GDI+[81]: TGPImage(1) - 顯示圖像

編輯:Delphi

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

TGPGraphics.DrawImage 函數有太多重載了, 一起列在這吧: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;

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 img: TGPImage;
begin
 g := 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.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 290
 ClientWidth = 355
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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