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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[36]: TGPPen - SetLineCap

再學GDI+[36]: TGPPen - SetLineCap

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;
  ComboBox2: TComboBox;
  ComboBox3: TComboBox;
  ComboBox4: TComboBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ComboBox1Change(Sender: TObject);
  procedure ComboBox2Change(Sender: TObject);
  procedure ComboBox3Change(Sender: TObject);
  procedure ComboBox4Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
var StartCap,EndCap,DashCap: Integer;
procedure TForm1.FormCreate(Sender: TObject);
var
 i: Integer;
begin
 ComboBox1.Text := '虛線樣式';
 ComboBox2.Text := '起點線帽';
 ComboBox3.Text := '中間線帽';
 ComboBox4.Text := '終點線帽';
 for i := 0 to 5 do
  ComboBox1.Items.Add(GetEnumName(TypeInfo(TDashStyle), i));
 ComboBox2.Items.Add('LineCapFlat');
 ComboBox2.Items.Add('LineCapSquare');
 ComboBox2.Items.Add('LineCapRound');
 ComboBox2.Items.Add('LineCapTriangle');
 ComboBox2.Items.Add('LineCapNoAnchor');
 ComboBox2.Items.Add('LineCapSquareAnchor');
 ComboBox2.Items.Add('LineCapRoundAnchor');
 ComboBox2.Items.Add('LineCapDiamondAnchor');
 ComboBox2.Items.Add('LineCapArrowAnchor');
 ComboBox3.Items := ComboBox2.Items;
 ComboBox4.Items := ComboBox2.Items;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
 ColorArr: array[0..2] of TGPColor = (aclRed, aclGreen, aclBlue);
var
 g: TGPGraphics;
 p: TGPPen;
 x1,x2,y: Integer;
 i: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create($FF000000, 16);
 p.SetDashStyle(TDashStyle(ComboBox1.ItemIndex));
 p.SetLineCap(StartCap, EndCap, DashCap);
 x1 := 50;
 x2 := ClientWidth - 50;
 y := 60;
 for i := 0 to 2 do
 begin
  p.SetColor(ColorArr[i]);
  g.DrawLine(p, x1, y, x2, y);
  Inc(y, 40);
 end;
 p.Free;
 g.Free;
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.ComboBox2Change(Sender: TObject);
var
 i: Integer;
begin
 i := 0;
 case TComboBox(Sender).ItemIndex of
  0 : i := LineCapFlat;
  1 : i := LineCapSquare;
  2 : i := LineCapRound;
  3 : i := LineCapTriangle;
  4 : i := LineCapNoAnchor;
  5 : i := LineCapSquareAnchor;
  6 : i := LineCapRoundAnchor;
  7 : i := LineCapDiamondAnchor;
  8 : i := LineCapArrowAnchor;
  9 : i := LineCapCustom;
  10: i := LineCapAnchorMask;
 end;
 if TComboBox(Sender) = ComboBox2 then StartCap := i;
 if TComboBox(Sender) = ComboBox3 then DashCap := i;
 if TComboBox(Sender) = ComboBox4 then EndCap := i;
 Repaint;
end;
procedure TForm1.ComboBox3Change(Sender: TObject);
begin
 ComboBox2Change(Sender);
end;
procedure TForm1.ComboBox4Change(Sender: TObject);
begin
 ComboBox2Change(Sender);
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 165
 ClientWidth = 515
 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 = 8
  Top = 8
  Width = 121
  Height = 21
  ItemHeight = 13
  TabOrder = 0
  Text = 'ComboBox1'
  OnChange = ComboBox1Change
 end
 object ComboBox2: TComboBox
  Left = 135
  Top = 8
  Width = 121
  Height = 21
  ItemHeight = 13
  TabOrder = 1
  Text = 'ComboBox2'
  OnChange = ComboBox2Change
 end
 object ComboBox3: TComboBox
  Left = 262
  Top = 8
  Width = 121
  Height = 21
  ItemHeight = 13
  TabOrder = 2
  Text = 'ComboBox3'
  OnChange = ComboBox3Change
 end
 object ComboBox4: TComboBox
  Left = 389
  Top = 8
  Width = 121
  Height = 21
  ItemHeight = 13
  TabOrder = 3
  Text = 'ComboBox4'
  OnChange = ComboBox4Change
 end
end

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