再学GDI+[44]: 文本输出

本例效果图:

代码文件: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: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