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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[23]: TGPLinearGradientBrush - 之二

再學GDI+[23]: TGPLinearGradientBrush - 之二

編輯:Delphi

TGPLinearGradientBrush.Create(
 rect: TGPRect;        {變化范圍}
 color1, color2: TGPColor;   {起始色與終止色}
 angle: Single;        {旋轉角度}
 isAngleScalable: BOOL = FALSE {是否受 TLinearGradientMode 的影響, 可選值, 默認不 受影響}
);
TGPLinearGradientBrush.Create(
 rect: TGPRectF;
 color1, color2: TGPColor;
 angle: Single;
 isAngleScalable: BOOL = FALSE
);

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, TeCanvas, ExtCtrls, ComCtrls;
type
 TForm1 = class(TForm)
  ButtonColor1: TButtonColor;
  ButtonColor2: TButtonColor;
  TrackBar1: TTrackBar;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure ButtonColor1Click(Sender: TObject);
  procedure ButtonColor2Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
begin
 ButtonColor1.Caption := '色1   ';
 ButtonColor2.Caption := '色2   ';
 ButtonColor1.SymbolColor := clLime;
 ButtonColor2.SymbolColor := clBlack;
 TrackBar1.ShowSelRange := False;
 TrackBar1.Min := 0;
 TrackBar1.Max := 360;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 lb: TGPLinearGradientBrush;
 c1,c2: TGPColor;
 r: TGPRect;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 r := MakeRect(20, 40, ClientWidth - 40, ClientHeight - 50);
 c1 := ColorRefToARGB(ButtonColor1.SymbolColor);
 c2 := ColorRefToARGB(ButtonColor2.SymbolColor);
 lb := TGPLinearGradientBrush.Create(r, c1, c2, TrackBar1.Position);
 g.FillEllipse(lb, r);
 lb.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.ButtonColor1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.ButtonColor2Click(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 197
 ClientWidth = 253
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poScreenCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object ButtonColor1: TButtonColor
  Left = 143
  Top = 8
  Width = 49
  Caption = 'ButtonColor1'
  TabOrder = 0
  OnClick = ButtonColor1Click
 end
 object ButtonColor2: TButtonColor
  Left = 198
  Top = 8
  Width = 49
  Caption = 'ButtonColor2'
  TabOrder = 1
  OnClick = ButtonColor2Click
 end
 object TrackBar1: TTrackBar
  Left = 1
  Top = 9
  Width = 137
  Height = 24
  TabOrder = 2
  OnChange = TrackBar1Change
 end
end

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