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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[57]: 路徑 - Widen

再學 GDI+[57]: 路徑 - Widen

編輯:Delphi

路徑的 Widen 方法可以把路徑中的線, 根據指定畫筆的寬度與樣式, 轉換為一個范圍(有點類似區域); 但轉換後再描繪路徑就只能使用 FillPath 而不是 DrawPath 了. 本例沒有測試它的兩個默認參數, 因為前面已多次提到了.

  本例效果圖:

再學 GDI+[57]: 路徑 - Widen

  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;
procedure TForm1.FormCreate(Sender: TObject);
begin
 CheckBox1.Caption := '執行 Widen';
 CheckBox2.Caption := '顯示路徑中所有的點';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 b1,b2: TGPBrush;
 path: TGPGraphicsPath;
 pts: array of TGPPoint;
 i: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclSlateGray, 20);
 p.SetEndCap(LineCapArrowAnchor);
 b1 := TGPSolidBrush.Create(aclRed);
 b2 := TGPHatchBrush.Create(HatchStyleDiagonalCross, aclSilver, aclSlateGray);
 path := TGPGraphicsPath.Create;
 path.AddLine(40, 50, ClIEntWidth-40, 50);
 if CheckBox1.Checked then
 begin
  path.Widen(p);
  g.FillPath(b2, path);
 end else g.DrawPath(p, path);
 if CheckBox2.Checked then
 begin
  SetLength(pts, path.GetPointCount);
  path.GetPathPoints(PGPPoint(pts), Length(pts));
  TGPSolidBrush(b1).SetColor(aclRed);
  for i := 0 to Length(pts) - 1 do
   g.FillRectangle(b1, pts[i].X-3, pts[i].Y-3, 6, 6);
 end;
 path.Free;
 b1.Free;
 b2.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 = 136
 ClIEntWidth = 287
 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 = 43
  Top = 104
  Width = 97
  Height = 17
  Caption = 'CheckBox1'
  TabOrder = 0
  OnClick = CheckBox1Click
 end
 object CheckBox2: TCheckBox
  Left = 138
  Top = 104
  Width = 125
  Height = 17
  Caption = 'CheckBox2'
  TabOrder = 1
  OnClick = CheckBox2Click
 end
end


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