本例效果圖:

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代碼文件:

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unit Unit1;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, StdCtrls;typeTForm1 = class(TForm)ListBox1: TListBox;procedure FormCreate(Sender: TObject);procedure FormPaint(Sender: TObject);procedure ListBox1Click(Sender: TObject);end;varForm1: TForm1;implementation{$R *.dfm}uses GDIPOBJ, GDIPAPI;procedure TForm1.FormCreate(Sender: TObject); beginListBox1.Align := alRight;with ListBox1.Items dobeginAdd('SmoothingModeInvalid '); Add('SmoothingModeDefault ');Add('SmoothingModeHighSpeed '); Add('SmoothingModeHighQuality'); Add('SmoothingModeNone ');Add('SmoothingModeAntiAlias '); end; end;procedure TForm1.FormPaint(Sender: TObject); varg: TGPGraphics;p: TGPPen; beging := TGPGraphics.Create(Canvas.Handle);p := TGPPen.Create(aclRed, 2);g.SetSmoothingMode(ListBox1.ItemIndex - 1);g.DrawEllipse(p, 10, 10, ClientWidth - ListBox1.Width - 20, ClientHeight - 20);g.DrawLine(p, 0, 0, ClientWidth - ListBox1.Width, ClientHeight);g.DrawLine(p, ClientWidth - ListBox1.Width, 0, 0, ClientHeight);p.Free;g.Free; end;procedure TForm1.ListBox1Click(Sender: TObject); beginRepaint; end;end. 窗體文件:

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object Form1: TForm1Left = 0Top = 0Caption = 'Form1'ClientHeight = 108ClientWidth = 286Color = clBtnFaceFont.Charset = DEFAULT_CHARSETFont.Color = clWindowTextFont.Height = -11Font.Name = 'Tahoma'Font.Style = []OldCreateOrder = FalsePosition = poDesktopCenterOnCreate = FormCreateOnPaint = FormPaintPixelsPerInch = 96TextHeight = 13object ListBox1: TListBoxLeft = 133Top = 8Width = 145Height = 73ItemHeight = 13TabOrder = 0OnClick = ListBox1Clickend end 繪圖質量參數:

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SmoothingModeInvalid = -1; {指定一個無效模式} SmoothingModeDefault = 0; {指定不消除鋸齒} SmoothingModeHighSpeed = 1; {指定高速度、低質量呈現} SmoothingModeHighQuality = 2; {指定高質量、低速度呈現} SmoothingModeNone = 3; {指定不消除鋸齒} SmoothingModeAntiAlias = 4; {指定消除鋸齒的呈現}

轉載于:https://www.cnblogs.com/del/archive/2008/06/23/1228119.html

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