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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> GdiPlus[23]: IGPFontFamily

GdiPlus[23]: IGPFontFamily

編輯:Delphi

 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:

GdiPlus[23]: IGPFontFamily

  關於以上四個方法的測試:

GdiPlus[23]: IGPFontFamily

  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 



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