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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[27]: TGPPen - 畫筆樣式 - SetDashStyle

再學GDI+[27]: TGPPen - 畫筆樣式 - SetDashStyle

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, ExtCtrls;
type
 TForm1 = class(TForm)
  ComboBox1: TComboBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ComboBox1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
var
 i: Integer;
begin
 for i := 0 to 5 do
  ComboBox1.Items.Add(GetEnumName(TypeInfo(TDashStyle), i));
 ComboBox1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.Clear($FFFFFFFF);
 p := TGPPen.Create(aclLimeGreen, 10);
 p.SetDashStyle(TDashStyle(ComboBox1.ItemIndex));
 g.DrawLine(p, 0, 0, ClientWidth, ClientHeight);
 p.Free;
 g.Free;
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 167
 ClientWidth = 242
 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 ComboBox1: TComboBox
  Left = 89
  Top = 8
  Width = 145
  Height = 21
  ItemHeight = 13
  TabOrder = 0
  Text = 'ComboBox1'
  OnChange = ComboBox1Change
 end
end

畫筆樣式枚舉的定義:DashStyle = (
 DashStyleSolid,   {指定實線}
 DashStyleDash,    {指定由劃線段組成的直線}
 DashStyleDot,    {指定由點構成的直線}
 DashStyleDashDot,  {指定由重復的劃線點圖案構成的直線}
 DashStyleDashDotDot, {指定由重復的劃線點點圖案構成的直線}
 DashStyleCustom   {指定用戶定義的自定義劃線段樣式}
);
TDashStyle = DashStyle;

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