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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[28]: TGPPen - 自定義畫筆的虛線樣式 - SetDashPattern

再學GDI+[28]: TGPPen - 自定義畫筆的虛線樣式 - SetDashPattern

編輯:Delphi

自定義的虛線樣式依賴與一個數組, 數組的元素分別代表虛線中線與間的長度, 數組大小好 像沒有限制;

本例使用了六個元素的數組, 也就是表示虛線有三個線段和和三個間隔構成.

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls, ComCtrls;
type
 TForm1 = class(TForm)
  Panel1: TPanel;
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  TrackBar3: TTrackBar;
  TrackBar4: TTrackBar;
  TrackBar5: TTrackBar;
  TrackBar6: TTrackBar;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
  procedure TrackBar3Change(Sender: TObject);
  procedure TrackBar4Change(Sender: TObject);
  procedure TrackBar5Change(Sender: TObject);
  procedure TrackBar6Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 DashArr: array[0..5] of Single;
procedure TForm1.FormCreate(Sender: TObject);
const
 n = 100;
begin
 TrackBar1.Max := n;
 TrackBar2.Max := n;
 TrackBar3.Max := n;
 TrackBar4.Max := n;
 TrackBar5.Max := n;
 TrackBar6.Max := n;
 TrackBar1.Position := n div 2;
 TrackBar2.Position := n div 2;
 TrackBar3.Position := n div 2;
 TrackBar4.Position := n div 2;
 TrackBar5.Position := n div 2;
 TrackBar6.Position := n div 2;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 rect: TRect;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed, 4);
 DashArr[0] := TrackBar1.Position / 10;
 DashArr[1] := TrackBar2.Position / 10;
 DashArr[2] := TrackBar3.Position / 10;
 DashArr[3] := TrackBar4.Position / 10;
 DashArr[4] := TrackBar5.Position / 10;
 DashArr[5] := TrackBar6.Position / 10;
 p.SetDashPattern(@DashArr, Length(DashArr)); {設置虛線}
 g.DrawLine(p, 0, 0, ClientWidth - Panel1.Width, ClientHeight);
 rect := Bounds(0, 0, ClientWidth - Panel1.Width, ClientHeight);
 InflateRect(rect, -30, -30);
 g.DrawEllipse(p, MakeRect(rect));
 p.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;
procedure TForm1.TrackBar5Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar6Change(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 153
 ClientWidth = 306
 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 Panel1: TPanel
  Left = 207
  Top = 0
  Width = 99
  Height = 153
  Align = alRight
  TabOrder = 0
  ExplicitLeft = 200
  ExplicitHeight = 205
  object TrackBar1: TTrackBar
   Left = 0
   Top = 8
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 0
   OnChange = TrackBar1Change
  end
  object TrackBar2: TTrackBar
   Left = 0
   Top = 31
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 1
   OnChange = TrackBar2Change
  end
  object TrackBar3: TTrackBar
   Left = 0
   Top = 55
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 2
   OnChange = TrackBar3Change
  end
  object TrackBar4: TTrackBar
   Left = 0
   Top = 79
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 3
   OnChange = TrackBar4Change
  end
  object TrackBar5: TTrackBar
   Left = 0
   Top = 103
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 4
   OnChange = TrackBar5Change
  end
  object TrackBar6: TTrackBar
   Left = 0
   Top = 127
   Width = 97
   Height = 20
   ShowSelRange = False
   TabOrder = 5
   OnChange = TrackBar6Change
  end
 end
end

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