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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[91]: TGPImage(11) - 轉灰度圖像

再學 GDI+[91]: TGPImage(11) - 轉灰度圖像

編輯:Delphi

本例效果圖:

再學 GDI+[91]: TGPImage(11) - 轉灰度圖像

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  CheckBox1: TCheckBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure CheckBox1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
const
 {一般模式}
 ColorMatrix1: TColorMatrix = (
  (1.0, 0.0, 0.0, 0.0, 0.0),
  (0.0, 1.0, 0.0, 0.0, 0.0),
  (0.0, 0.0, 1.0, 0.0, 0.0),
  (0.0, 0.0, 0.0, 1.0, 0.0),
  (0.0, 0.0, 0.0, 0.0, 1.0));
 {灰度模式}
 ColorMatrix2: TColorMatrix = (
  (0.3, 0.3, 0.3, 0.0, 0.0),
  (0.59, 0.59, 0.59, 0.0, 0.0),
  (0.11, 0.11, 0.11, 0.0, 0.0),
  (0.0, 0.0, 0.0, 1.0, 0.0),
  (0.0, 0.0, 0.0, 0.0, 1.0));
procedure TForm1.FormCreate(Sender: TObject);
begin
 CheckBox1.Caption := '轉為灰度';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 img: TGPImage;
 ImageAttributes: TGPImageAttributes;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 img := TGPImage.Create('c:temptest.png');
 ImageAttributes := TGPImageAttributes.Create;
 if CheckBox1.Checked then
  ImageAttributes.SetColorMatrix(ColorMatrix2)
 else
  ImageAttributes.SetColorMatrix(ColorMatrix1);
 g.DrawImage(img,
       MakeRect(4, 4, img.GetWidth, img.GetHeight),
       0,
       0,
       img.GetWidth,
       img.GetHeight,
       UnitPixel,
       ImageAttributes
       );
 ImageAttributes.Free;
 img.Free;
 g.Free;
end;
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
 Repaint;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 216
 ClIEntWidth = 269
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object CheckBox1: TCheckBox
  Left = 183
  Top = 191
  Width = 79
  Height = 17
  Caption = 'CheckBox1'
  TabOrder = 0
  OnClick = CheckBox1Click
 end
end


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