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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[52]: 路徑 - Reverse、Reset

再學GDI+[52]: 路徑 - Reverse、Reset

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;
type
 TForm1 = class(TForm)
  CheckBox1: TCheckBox;
  CheckBox2: TCheckBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure CheckBox1Click(Sender: TObject);
  procedure CheckBox2Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var pts: array[0..6] of TGPPoint;
procedure TForm1.FormCreate(Sender: TObject);
begin
 pts[0].X := 10; pts[0].Y := 50;
 pts[1].X := 40; pts[1].Y := 90;
 pts[2].X := 80; pts[2].Y := 10;
 pts[3].X := 110; pts[3].Y := 50;
 pts[4].X := 140; pts[4].Y := 10;
 pts[5].X := 180; pts[5].Y := 90;
 pts[6].X := 210; pts[6].Y := 50;
 CheckBox1.Caption := '翻轉路徑中的點';
 CheckBox2.Caption := '清空路徑中的點';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 PathPts: array of TGPPoint;
 i: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed, 2);
 path := TGPGraphicsPath.Create;
 path.AddBeziers(PGPPoint(@pts), Length(pts));
 if CheckBox1.Checked then path.Reverse;
 if CheckBox2.Checked then path.Reset;
 {Reset 時, 會清空 PathPoints 和 PathTypes 數組並將 FillMode 設置為 FillModeAlternate}
 SetLength(PathPts, path.GetPointCount);
 path.GetPathPoints(PGPPoint(PathPts), Length(PathPts));
 Canvas.Pen.Color := clGray;
 for i := Low(PathPts) to High(PathPts) do
  Canvas.TextOut(PathPts[i].X, PathPts[i].Y, IntToStr(i+1));
 g.DrawPath(p, path);
 path.Free;
 p.Free;
 g.Free;
end;
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.CheckBox2Click(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 156
 ClientWidth = 232
 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 CheckBox1: TCheckBox
  Left = 12
  Top = 126
  Width = 113
  Height = 17
  Caption = 'CheckBox1'
  TabOrder = 0
  OnClick = CheckBox1Click
 end
 object CheckBox2: TCheckBox
  Left = 123
  Top = 126
  Width = 106
  Height = 17
  Caption = 'CheckBox2'
  TabOrder = 1
  OnClick = CheckBox2Click
 end
end

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