本例效果圖:
代碼文件:unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, ComCtrls;
type
TForm1 = class(TForm)
RadioGroup1: TRadioGroup;
TrackBar1: TTrackBar;
procedure FormCreate(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure RadioGroup1Click(Sender: TObject);
procedure TrackBar1Change(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ,GDIPAPI,TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
var
i: Integer;
begin
for i := 0 to 6 do
RadioGroup1.Items.Add(GetEnumName(TypeInfo(TUnit), i));
RadioGroup1.ItemIndex := 2;
RadioGroup1.Buttons[0].Enabled := False;
RadioGroup1.Buttons[1].Enabled := False;
RadioGroup1.Buttons[4].Enabled := False;
RadioGroup1.Buttons[5].Enabled := False;
TrackBar1.ShowSelRange := False;
TrackBar1.Min := 1;
TrackBar1.Max := 100;
TrackBar1.Position := 22;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
g: TGPGraphics;
b: TGPBrush;
font: TGPFont;
begin
g := TGPGraphics.Create(Canvas.Handle);
b := TGPSolidBrush.Create(aclDarkOrange);
font := TGPFont.Create('Arial Black',
TrackBar1.Position,
FontStyleBoldItalic,
TUnit(RadioGroup1.ItemIndex) {字號單位, 默認是像素: UnitPixel}
);
g.DrawString('Delphi', -1, font, MakePoint(5.0, 5), b);
b.Free;
font.Free;
g.Free;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
Repaint;
Text := IntToStr(TrackBar1.Position);
TrackBar1.Refresh;
end;
end.
