再学 GDI+文本输出文本样式

代码文件:

---

unit Unit1;

interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, CheckLst;

type
  TForm1 = class(TForm)
    CheckListBox1: TCheckListBox;
    procedure FormPaint(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure CheckListBox1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation{$R *.dfm}uses GDIPOBJ, GDIPAPI;

var fs: Integer;

procedure TForm1.CheckListBox1Click(Sender: TObject);
const
  fsArr: array[0..5] of Integer = (FontStyleRegular,
                                   FontStyleBold,
                                   FontStyleItalic,
                                   FontStyleBoldItalic,
                                   FontStyleUnderline,
                                   FontStyleStrikeout);
var
  i: Integer;
begin
  fs := 0;
  for i := 0to CheckListBox1.Items.Count - 1do
    if CheckListBox1.Checked[i] then
      fs := fs or fsArr[i];
  Repaint;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  CheckListBox1.Align := alLeft;
  CheckListBox1.Items.CommaText := 'FontStyleRegular,' +
                                   'FontStyleBold,' +
                                   'FontStyleItalic,' +
                                   'FontStyleBoldItalic,' +
                                   'FontStyleUnderline,' +
                                   'FontStyleStrikeout';
  CheckListBox1.Checked[0] := True;
end;

procedure TForm1.FormPaint(Sender: TObject);
var
  g: TGPGraphics;
  sb: TGPSolidBrush;
  font: TGPFont;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  sb := TGPSolidBrush.Create(aclRed);

  font := TGPFont.Create('微软雅黑', 50, fs);
  g.DrawString('Delphi', -1, font, MakePoint(CheckListBox1.Width + 0.0, 0), sb);

  font.Free;
  sb.Free;
  g.Free;
end;

end.

---

窗体文件:

---

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 98
  ClientWidth = 367
  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 CheckListBox1: TCheckListBox
    Left = 8
    Top = 8
    Width = 113
    Height = 148
    ItemHeight = 13
    TabOrder = 0
    OnClick = CheckListBox1Click
  endend

---

文本样式的定义:

---

FontStyle = Integer;
const
  FontStyleRegular    = Integer(0); {普通文本}
  FontStyleBold       = Integer(1); {加粗文本}
  FontStyleItalic     = Integer(2); {倾斜文本}
  FontStyleBoldItalic = Integer(3); {加粗并倾斜文本}
  FontStyleUnderline  = Integer(4); {带下划线的文本}
  FontStyleStrikeout  = Integer(8); {中间有直线通过的文本}
Type
TFontStyle = FontStyle;