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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[62]: 路徑畫刷(2) - SetCenterPoint、GetCenterPoint

再學 GDI+[62]: 路徑畫刷(2) - SetCenterPoint、GetCenterPoint

編輯:Delphi

本例效果圖:

再學 GDI+[62]: 路徑畫刷(2) - SetCenterPoint、GetCenterPoint

  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)
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure FormMouseUp(Sender: TObject; Button: TMouseButton;
   Shift: TShiftState; X, Y: Integer);
  procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
   Shift: TShiftState; X, Y: Integer);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 rect: TGPRect;
 pt: TGPPoint;
 pb: TGPPathGradIEntBrush;
procedure TForm1.FormCreate(Sender: TObject);
var
 path: TGPGraphicsPath;
 ColorSurround: TGPColor; {只用一種包圍色, 就別用數組了}
 num: Integer;
begin
 rect := MakeRect(10, 10, ClientWidth-20, ClIEntHeight-20);
 path := TGPGraphicsPath.Create;
 path.AddEllipse(rect);
 pb := TGPPathGradIEntBrush.Create(path);
 pb.SetCenterColor(aclLime);
 pb.GetCenterPoint(pt);
 ColorSurround := aclBlack;
 num := 1;
 pb.SetSurroundColors(@ColorSurround, num);
 path.Free;
 DoubleBuffered := True;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 pb.Free;
end;
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
 Shift: TShiftState; X, Y: Integer);
begin
 pt.X := X;
 pt.Y := Y;
 Repaint;
end;
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
 Shift: TShiftState; X, Y: Integer);
begin
 Repaint;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed);
 g.FillEllipse(pb, rect);
 pb.SetCenterPoint(pt);
 g.DrawRectangle(p, pt.X-3, pt.Y-3, 6, 6);
 p.Free;
 g.Free;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 164
 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
 OnDestroy = FormDestroy
 OnMouseDown = FormMouseDown
 OnMouseUp = FormMouseUp
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end


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