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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[6]: DrawPie - 繪制餅形

再學GDI+[6]: DrawPie - 繪制餅形

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, Spin, ExtCtrls;
type
 TForm1 = class(TForm)
  Panel1: TPanel;
  Label1: TLabel;
  Label2: TLabel;
  SpinEdit1: TSpinEdit;
  SpinEdit2: TSpinEdit;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 a1,a2: Integer;
procedure TForm1.FormCreate(Sender: TObject);
begin
 a1 := 0;
 a2 := 30;
 SpinEdit1.Text := IntToStr(a1);
 SpinEdit2.Text := IntToStr(a2);
 SpinEdit1.Increment := 10;
 SpinEdit2.Increment := 10;
 SpinEdit1.OnChange := FormPaint;
 SpinEdit2.OnChange := FormPaint;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 x,y,w,h: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed, 2);
 g.Clear(aclWhite);
 x := ClientWidth div 6;
 y := ClientHeight div 6;
 w := x * 4;
 h := y * 3;
 a1 := StrToIntDef(SpinEdit1.Text, 0);
 a2 := StrToIntDef(SpinEdit2.Text, 30);
 g.DrawPie(p, x, y, w, h, a1, a2);
 g.Free;
 p.Free;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 184
 ClientWidth = 258
 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 Panel1: TPanel
  Left = 0
  Top = 151
  Width = 258
  Height = 33
  Align = alBottom
  BevelOuter = bvNone
  TabOrder = 0
  ExplicitLeft = 8
  ExplicitTop = 96
  ExplicitWidth = 257
  object Label2: TLabel
   Left = 136
   Top = 8
   Width = 52
   Height = 13
   Caption = #26059#36716#35282#24230':'
  end
  object Label1: TLabel
   Left = 8
   Top = 8
   Width = 52
   Height = 13
   Caption = #36215#22987#35282#24230':'
  end
  object SpinEdit2: TSpinEdit
   Left = 194
   Top = 3
   Width = 55
   Height = 22
   MaxValue = 0
   MinValue = 0
   TabOrder = 0
   Value = 0
  end
  object SpinEdit1: TSpinEdit
   Left = 66
   Top = 3
   Width = 55
   Height = 22
   MaxValue = 0
   MinValue = 0
   TabOrder = 1
   Value = 0
  end
 end
end

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