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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[61] 路徑畫刷(1) - SetCenterColor、SetSurroundColor

再學GDI+[61] 路徑畫刷(1) - SetCenterColor、SetSurroundColor

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, CheckLst, ExtCtrls, TeCanvas;
type
 TForm1 = class(TForm)
  ButtonColor1: TButtonColor;
  ButtonColor2: TButtonColor;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ButtonColor1Click(Sender: TObject);
  procedure ButtonColor2Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 ButtonColor1.Caption := '中心色  ';
 ButtonColor2.Caption := '周邊色  ';
 ButtonColor1.SymbolColor := clLime;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 rect: TGPRect;
 path: TGPGraphicsPath;
 pb: TGPPathGradientBrush;
 ColorArr: array[0..0] of TGPColor;
 num: Integer;
begin
 rect := MakeRect(20, 10, ClientWidth - 40, ClientHeight - 50);
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddEllipse(rect);
 pb := TGPPathGradientBrush.Create(path);
 pb.SetCenterColor(ColorRefToARGB(ButtonColor1.SymbolColor));
 ColorArr[0] := ColorRefToARGB(ButtonColor2.SymbolColor);
 num := 1;
 pb.SetSurroundColors(PARGB(@ColorArr), num);
 g.FillEllipse(pb, rect);
 pb.Free;
 path.Free;
 g.Free;
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 = 258
 ClientWidth = 208
 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 ButtonColor1: TButtonColor
  Left = 24
  Top = 225
  Caption = 'ButtonColor1'
  TabOrder = 0
  OnClick = ButtonColor1Click
 end
 object ButtonColor2: TButtonColor
  Left = 112
  Top = 225
  Caption = 'ButtonColor2'
  TabOrder = 1
  OnClick = ButtonColor2Click
 end
end

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