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('微軟雅黑' );
Font := TGPFont.Create(FontFamily, 16);
Brush := TGPSolidBrush.Create($FFFF0000);
Canvas.ToGPGraphics.DrawString(Font.Family.FamilyName, Font, Pt, Brush);
end;
IGPFontFamily 有四個獲取相關尺寸的方法:
GetEmHeight、GetCellAscent、GetCellDescent、GetLineSpacing.
MSDN 上有一張相關圖片:
關於以上四個方法的測試:
代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Memo1: TMemo;
ComboBox1: TComboBox;
procedure FormCreate(Sender: TObject);
procedure ComboBox1Change(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$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('宋體');
ComboBox1.OnChange(Sender);
end;
end.
窗體文件:
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