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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[100]: TGPImage(20) - 替換顏色

再學 GDI+[100]: TGPImage(20) - 替換顏色

編輯:Delphi

本例效果圖:

再學 GDI+[100]: TGPImage(20) - 替換顏色

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, TeCanvas;
type
 TForm1 = class(TForm)
  ButtonColor1: TButtonColor;
  Button1: TButton;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ButtonColor1Click(Sender: TObject);
  procedure FormMouseUp(Sender: TObject; Button: TMouseButton;
   Shift: TShiftState; X, Y: Integer);
  procedure Button1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 img: TGPImage;
 ImageAttributes: TGPImageAttributes;
 ColorMap: array[0..0] of TColorMap; {每個元素包含新舊兩種顏色}
procedure TForm1.FormCreate(Sender: TObject);
begin
 img := TGPImage.Create('c:temptest.png');
 ClIEntWidth := img.GetWidth;
 ClIEntHeight := img.GetHeight;
 ImageAttributes := TGPImageAttributes.Create;
 ColorMap[0].oldColor := aclBlack;
 ColorMap[0].newColor := aclBlack;
 ButtonColor1.Caption := '替換';
 Button1.Caption := '復原';
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
 ImageAttributes.Free;
end;
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
 Shift: TShiftState; X, Y: Integer);
var
 color: TColor;
begin
 color := GetPixel(Canvas.Handle, X, Y);
 ColorMap[0].oldColor := ColorRefToARGB(color);
 ButtonColor1.SymbolColor := color;
 ButtonColor1.Refresh;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.DrawImage(img,
       MakeRect(0, 0, img.GetWidth, img.GetHeight),
       0, 0,
       img.GetWidth, img.GetHeight,        
       UnitPixel,
       ImageAttributes
       );
 g.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 ButtonColor1.SymbolColor := ARGBToColorRef(ColorMap[0].OldColor);
 ButtonColor1.Enabled := True;
 ButtonColor1.Update;
 ImageAttributes.ClearRemapTable; {ClearRemapTable}
 Repaint;
end;
procedure TForm1.ButtonColor1Click(Sender: TObject);
begin
 ColorMap[0].newColor := ColorRefToARGB(ButtonColor1.SymbolColor);
 ImageAttributes.SetRemapTable(Length(ColorMap), @ColorMap); {SetRemapTable}
 Repaint;
 ButtonColor1.Enabled := False;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 220
 ClIEntWidth = 315
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnMouseUp = FormMouseUp
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object ButtonColor1: TButtonColor
  Left = 231
  Top = 8
  Caption = 'ButtonColor1'
  TabOrder = 0
  OnClick = ButtonColor1Click
 end
 object Button1: TButton
  Left = 231
  Top = 39
  Width = 75
  Height = 25
  Caption = 'Button1'
  TabOrder = 1
  OnClick = Button1Click
 end
end


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