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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[60]: TGPGraphics.SetSmoothingMode - 繪圖質量

再學GDI+[60]: TGPGraphics.SetSmoothingMode - 繪圖質量

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;
type
 TForm1 = class(TForm)
  ListBox1: TListBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ListBox1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 ListBox1.Align := alRight;
 with ListBox1.Items do
 begin
  Add('SmoothingModeInvalid  ');   
  Add('SmoothingModeDefault  ');
  Add('SmoothingModeHighSpeed ');  
  Add('SmoothingModeHighQuality'); 
  Add('SmoothingModeNone    ');
  Add('SmoothingModeAntiAlias '); 
 end;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := 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);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 108
 ClientWidth = 286
 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 ListBox1: TListBox
  Left = 133
  Top = 8
  Width = 145
  Height = 73
  ItemHeight = 13
  TabOrder = 0
  OnClick = ListBox1Click
 end
end
繪圖質量參數: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}

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