本例效果圖:
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:\temp\test.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
