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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[93]: TGPImage(13) - 調整圖像紅、綠、藍三原色及透明度

再學 GDI+[93]: TGPImage(13) - 調整圖像紅、綠、藍三原色及透明度

編輯:Delphi

本例效果圖:

再學 GDI+[93]: TGPImage(13) - 調整圖像紅、綠、藍三原色及透明度

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ComCtrls;
type
 TForm1 = class(TForm)
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  TrackBar3: TTrackBar;
  TrackBar4: TTrackBar;
  Label1: TLabel;
  Label2: TLabel;
  Label3: TLabel;
  Label4: TLabel;
  procedure FormPaint(Sender: TObject);
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
  procedure TrackBar3Change(Sender: TObject);
  procedure TrackBar4Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 img: TGPImage;
 var
 ColorMatrix: 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));
procedure TForm1.FormCreate(Sender: TObject);
begin
 img := TGPImage.Create('c:temptest.png'); {這是專門加工的顏色測試圖片}
 TrackBar1.Height := 23;
 TrackBar1.ShowSelRange := False;
 TrackBar1.Max := 100;
 TrackBar1.Position := TrackBar1.Max;
 TrackBar2.Height := 23;
 TrackBar2.ShowSelRange := False;
 TrackBar2.Max := 100;
 TrackBar2.Position := TrackBar2.Max;
 TrackBar3.Height := 23;
 TrackBar3.ShowSelRange := False;
 TrackBar3.Max := 100;
 TrackBar3.Position := TrackBar3.Max;
 TrackBar4.Height := 23;
 TrackBar4.ShowSelRange := False;
 TrackBar4.Max := 100;
 TrackBar4.Position := TrackBar4.Max;
 DoubleBuffered := True;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 ImageAttributes: TGPImageAttributes;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 ImageAttributes := TGPImageAttributes.Create;
 ColorMatrix[0,0] := TrackBar1.Position / 100; {調整紅色}
 ColorMatrix[1,1] := TrackBar2.Position / 100; {調整綠色}
 ColorMatrix[2,2] := TrackBar3.Position / 100; {調整藍色}
 ColorMatrix[3,3] := TrackBar4.Position / 100; {調整透明度}
 ImageAttributes.SetColorMatrix(ColorMatrix);
 g.DrawImage(img,                      {要繪制的圖像}
       MakeRect(10, 10, img.GetWidth, img.GetHeight), {圖像將放縮以適合此矩形}
       0, 0,                     {繪圖位置}
       img.GetWidth, img.GetHeight,          {大小}
       UnitPixel,                   {單位}
       ImageAttributes                {圖像屬性}
       );
 ImageAttributes.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar3Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar4Change(Sender: TObject);
begin
 Repaint;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 259
 ClIEntWidth = 219
 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
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object Label1: TLabel
  Left = 23
  Top = 160
  Width = 24
  Height = 13
  Caption = #32418#33394
 end
 object Label2: TLabel
  Left = 23
  Top = 184
  Width = 24
  Height = 13
  Caption = #32511#33394
 end
 object Label3: TLabel
  Left = 23
  Top = 206
  Width = 24
  Height = 13
  Caption = #34013#33394
 end
 object Label4: TLabel
  Left = 11
  Top = 230
  Width = 36
  Height = 13
  Caption = #36879#26126#24230
 end
 object TrackBar1: TTrackBar
  Left = 48
  Top = 157
  Width = 164
  Height = 45
  TabOrder = 0
  OnChange = TrackBar1Change
 end
 object TrackBar2: TTrackBar
  Left = 48
  Top = 179
  Width = 164
  Height = 45
  TabOrder = 1
  OnChange = TrackBar2Change
 end
 object TrackBar3: TTrackBar
  Left = 48
  Top = 201
  Width = 163
  Height = 45
  TabOrder = 2
  OnChange = TrackBar3Change
 end
 object TrackBar4: TTrackBar
  Left = 48
  Top = 224
  Width = 163
  Height = 45
  TabOrder = 3
  OnChange = TrackBar4Change
 end
end


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