再学 GDI+[44]: 文本输出 - 字体

本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    ListBox1: TListBox;

    procedure FormPaint(Sender: TObject);

    procedure FormCreate(Sender: TObject);

    procedure ListBox1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GDIPOBJ, GDIPAPI;



var

  FontName: string = '宋体';



procedure TForm1.FormCreate(Sender: TObject);

var

  str: string;

begin

  ListBox1.Align := alRight;

  for str in Screen.Fonts do

    if str[1] <> '@' then

      ListBox1.Items.Add(str);

end;



procedure TForm1.FormPaint(Sender: TObject);

var

  g: TGPGraphics;

  b: TGPBrush;

  font: TGPFont;

  fontFamily: TGPFontFamily;

begin

  g := TGPGraphics.Create(Canvas.Handle);

  b := TGPSolidBrush.Create(aclRed);

  fontFamily := TGPFontFamily.Create(FontName);

  font := TGPFont.Create(fontFamily, 48, FontStyleBold);



  g.DrawString('Delphi', -1, font, MakePoint(5.0,20.0), b);

  Text := Format('Height: %f', [font.GetHeight(g)]);



  fontFamily.Free;

  font.Free;

  b.Free;

  g.Free;

end;



procedure TForm1.ListBox1Click(Sender: TObject);

begin

  FontName := ListBox1.Items[ListBox1.ItemIndex];

  Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 126

  ClientWidth = 375

  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 = 242

    Top = 8

    Width = 121

    Height = 97

    ItemHeight = 13

    TabOrder = 0

    OnClick = ListBox1Click

  end

end