GdiPlus[23]: IGPFontFamily

IGPFontFamily 的基本使用:

---

uses GdiPlus, GdiPlusHelpers;



procedure TForm1.FormPaint(Sender: TObject);

const

  Pt: TGPPointF = (X:10; Y:10);

var

  FontFamily: IGPFontFamily;

  Font: IGPFont;

  Brush: IGPSolidBrush;

begin

  FontFamily := TGPFontFamily.Create('微软雅黑');

  Font := TGPFont.Create(FontFamily, 16);

  Brush := TGPSolidBrush.Create($FFFF0000);

  Canvas.ToGPGraphics.DrawString(Font.Family.FamilyName, Font, Pt, Brush);

end;


 
   

IGPFontFamily 有四个获取相关尺寸的方法:
GetEmHeight、GetCellAscent、GetCellDescent、GetLineSpacing.

MSDN 上有一张相关图片:

---

关于以上四个方法的测试:

---

---

代码文件:

---

unit Unit1;



interface



uses

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

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Memo1: TMemo;

    ComboBox1: TComboBox;

    procedure FormCreate(Sender: TObject);

    procedure ComboBox1Change(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GdiPlus;



procedure TForm1.ComboBox1Change(Sender: TObject);

const

  fn: array[0..4] of string = ('Regular', 'Bold', 'Italic', 'Underline', 'BoldItalic');

  fs: array[0..4] of TGPFontStyle = (FontStyleRegular, [FontStyleBold],

    [FontStyleItalic], [FontStyleUnderline], FontStyleBoldItalic);

var

  FontFamily: IGPFontFamily;

  EmHeight,CellAscent,CellDescent,LineSpacing: Word;

  i: Integer;

begin

  FontFamily := TGPFontFamily.Create(ComboBox1.Text);

  Memo1.Clear;

  Memo1.Lines.BeginUpdate;

  for i := 0 to 4 do

  begin

    EmHeight := Fontfamily.GetEmHeight(fs[i]);

    CellAscent := FontFamily.GetCellAscent(fs[i]);

    CellDescent := FontFamily.GetCellAscent(fs[i]);

    LineSpacing := FontFamily.GetCellAscent(fs[i]);

    with Memo1.Lines do begin

      Add(Format('%s - %s:', [FontFamily.FamilyName, fn[i]]));

      Add(Format('EmHeight:'#9'%d', [EmHeight]));

      Add(Format('CellAscent:'#9'%d', [CellAscent]));

      Add(Format('CellDescent:'#9'%d', [CellDescent]));

      Add(Format('LineSpacing:'#9'%d', [LineSpacing]));

      Add('');

    end;

  end;

  Memo1.Lines.EndUpdate;

end;



procedure TForm1.FormCreate(Sender: TObject);

var

  FontCollection: IGPFontCollection;

  FontFamily: IGPFontFamily;

begin

  FontCollection := TGPInstalledFontCollection.Create;

  for FontFamily in FontCollection.Families do

  begin

    ComboBox1.Items.Add(FontFamily.FamilyName);

  end;

  ComboBox1.ItemIndex := ComboBox1.Items.IndexOf('宋体');

  ComboBox1.OnChange(Sender);

end;



end.


 
   

窗体文件:

---

object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 417

  ClientWidth = 388

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  PixelsPerInch = 96

  TextHeight = 13

  object Memo1: TMemo

    Left = 0

    Top = 0

    Width = 225

    Height = 417

    Align = alLeft

    Lines.Strings = (

      'Memo1')

    ScrollBars = ssVertical

    TabOrder = 0

  end

  object ComboBox1: TComboBox

    Left = 231

    Top = 16

    Width = 145

    Height = 21

    TabOrder = 1

    Text = 'ComboBox1'

    OnChange = ComboBox1Change

  end

end