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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[41]: 文本輸出 - 控制輸出字符的個數

再學 GDI+[41]: 文本輸出 - 控制輸出字符的個數

編輯:Delphi

本例效果圖:

再學 GDI+[41]: 文本輸出 - 控制輸出字符的個數

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
  procedure FormClick(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ,GDIPAPI;
var
 pc: PChar = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 num: Integer;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 b: TGPBrush;
 font: TGPFont;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 b := TGPSolidBrush.Create(aclGoldenrod);
 font := TGPFont.Create('Arial Black', 18, FontStyleRegular);
 
 {參數 2 為輸出字符的個數, -1 表示全部輸出}
 g.DrawString(pc, num, font, MakePoint(5.0, 5), b);
 b.Free;
 font.Free;
 g.Free;
end;
procedure TForm1.FormClick(Sender: TObject);
var
 i,n: Integer;
begin
 n := Length(pc);
 num := 0;
 for i:= 1 to n do
 begin
  num := i;
  Repaint;
  Sleep(100);
  Application.ProcessMessages;
 end;
 num := -1;
 for i:= 1 to Length(pc) do
 begin
  Inc(pc);
  Repaint;
  Sleep(100);
  Application.ProcessMessages;
 end;
 Dec(pc,n);
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 42
 ClIEntWidth = 501
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnClick = FormClick
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end


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