GdiPlus[44]: IGPGraphics (三) 关于文本绘制续 - IGPStringFormat

最新推荐文章于 2024-09-13 05:47:16 发布

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最新推荐文章于 2024-09-13 05:47:16 发布

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原文链接：https://my.oschina.net/hermer/blog/319200

本文详细介绍了IGPStringFormat类的方法、属性、类函数及其在实际编程中的应用，包括制表位设置、对齐方式、换行方式、数字替换规则等，并通过代码示例展示了如何在文本绘制中灵活运用这些特性。

为什么80%的码农都做不了架构师？>>>

IGPStringFormat 的方法和属性:

//方法:
IGPStringFormat.GetTabStops();                  { 获取制表位 }
IGPStringFormat.SetTabStops();                  { 设置制表位 }
IGPStringFormat.SetDigitSubstitution();         { 指定用本地数字替换西方数字时使用的语言和方法 }
IGPStringFormat.SetMeasurableCharacterRanges(); { 指定 IGPCharacterRanges 结构的数组 }

//属性:
IGPStringFormat.FormatFlags;                    { 获取或设置 TGPStringFormatFlags 集合 }
IGPStringFormat.Alignment;                      { 获取或设置水平对齐 }
IGPStringFormat.LineAlignment;                  { 获取或设置垂直对齐 }
IGPStringFormat.HotkeyPrefix;                   { 获取或设置 TGPHotkeyPrefix 枚举 }
IGPStringFormat.DigitSubstitutionLanguage;      { 获取或设置用本地数字替换西方数字时使用的语言 }
IGPStringFormat.DigitSubstitutionMethod;        { 获取或设置要用于数字替换的方法 }
IGPStringFormat.Trimming;                       { 获取或设置 TGPStringTrimming 枚举 }
IGPStringFormat.MeasurableCharacterRangeCount   { 指定的 IGPCharacterRanges 结构中的字符总数 }

//类函数:
TGPStringFormat.GenericDefault;      { 默认的 TGPStringFormat 对象 }
TGPStringFormat.GenericTypographic;  { 一般的版式 TGPStringFormat 对象 }

IGPStringFormat.Alignment 测试:

uses GdiPlus;

procedure TForm1.FormPaint(Sender: TObject);
const
  str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var
  Graphics: IGPGraphics;
  Brush: IGPSolidBrush;
  Pen: IGPPen;
  Font: IGPFont;
  StringFormat: IGPStringFormat;
  Rect: TGPRectF;
begin
  Graphics := TGPGraphics.Create(Handle);
  Brush := TGPSolidBrush.Create(TGPColor.Red);
  Pen := TGPPen.Create(TGPColor.Black);
  Font := TGPFont.Create('Arial', 16, [FontStyleBold]);
  StringFormat := TGPStringFormat.Create;

  Rect.Initialize(10, 10, 180, 60);
  Graphics.DrawString(str, Font, Rect, nil, Brush);
  Graphics.DrawRectangle(Pen, Rect);

  Rect.Y := Rect.Y + 60 + 20;
  StringFormat.Alignment := StringAlignmentCenter;
  Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
  Graphics.DrawRectangle(Pen, Rect);

  Rect.Y := Rect.Y + 60 + 20;
  StringFormat.Alignment := StringAlignmentFar;
  Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
  Graphics.DrawRectangle(Pen, Rect);
end;

IGPStringFormat.LineAlignment 测试:

uses GdiPlus;

procedure TForm1.FormPaint(Sender: TObject);
const
  str = 'ABCDEFG';
var
  Graphics: IGPGraphics;
  Brush: IGPSolidBrush;
  Pen: IGPPen;
  Font: IGPFont;
  StringFormat: IGPStringFormat;
  Rect: TGPRectF;
begin
  Graphics := TGPGraphics.Create(Handle);
  Brush := TGPSolidBrush.Create(TGPColor.Red);
  Pen := TGPPen.Create(TGPColor.Black);
  Font := TGPFont.Create('Arial', 16, [FontStyleBold]);
  StringFormat := TGPStringFormat.Create;

  Rect.Initialize(10, 10, 180, 60);
  Graphics.DrawString(str, Font, Rect, nil, Brush);
  Graphics.DrawRectangle(Pen, Rect);

  Rect.Y := Rect.Y + 60 + 20;
  StringFormat.LineAlignment := StringAlignmentCenter;
  Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
  Graphics.DrawRectangle(Pen, Rect);

  Rect.Y := Rect.Y + 60 + 20;
  StringFormat.LineAlignment := StringAlignmentFar;
  Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
  Graphics.DrawRectangle(Pen, Rect);
end;

IGPStringFormat.SetTabStops 测试:

uses GdiPlus;

procedure TForm1.FormPaint(Sender: TObject);
const
  Tabs: array [0..2] of Single = (150, 100, 100);
  Str = 'Name'#9'Test 1'#9'Test 2'#9'Test 3'#13#10 +
        'Joe'#9'95'#9'88'#9'91'#13#10 +
        'Mary'#9'98'#9'84'#9'90'#13#10 +
        'Sam'#9'42'#9'76'#9'98'#13#10 +
        'Jane'#9'65'#9'73'#9'92';
var
  Graphics: IGPGraphics;
  Brush: IGPSolidBrush;
  Pen: IGPPen;
  Font: IGPFont;
  StringFormat: IGPStringFormat;
  Rect: TGPRectF;
begin
  Graphics := TGPGraphics.Create(Handle);
  Brush := TGPSolidBrush.Create($FF000000);
  Pen := TGPPen.Create($FFFF0000);
  Font := TGPFont.Create('Courier New', 12);

  StringFormat := TGPStringFormat.Create;
  StringFormat.SetTabStops(0, [150, 100, 100]);
//  StringFormat.SetTabStops(50, [100, 100, 100]); //同上

  Rect.Initialize(10, 10, 420, 100);
  Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
  Graphics.DrawRectangle(Pen, Rect);
end;

IGPStringFormat.HotkeyPrefix 测试:

uses GdiPlus;

procedure TForm1.FormPaint(Sender: TObject);
var
  Graphics: IGPGraphics;
  Font: IGPFont;
  Pt: TGPPointF;
  Brush: IGPSolidBrush;
  StringFormat: IGPStringFormat;
begin
  Graphics := TGPGraphics.Create(Handle);
  Font := TGPFont.Create(Canvas.Font.Name, 12);
  Pt.Initialize(10, 10);
  Brush := TGPSolidBrush.Create($FF000000);

  StringFormat := TGPStringFormat.Create;
  StringFormat.HotkeyPrefix := HotkeyPrefixShow;

  Graphics.DrawString('&Button', Font, Pt, StringFormat, Brush);

  Pt.Y := Pt.Y * 2 + Font.GetHeight(Graphics);
  Graphics.DrawString('Butt&on', Font, Pt, StringFormat, Brush);
end;

IGPStringFormat.Trimming 测试:

uses GdiPlus;

procedure TForm1.FormPaint(Sender: TObject);
var
  Graphics: IGPGraphics;
  Font: IGPFont;
  Rect: TGPRectF;
  Brush: IGPSolidBrush;
  StringFormat: IGPStringFormat;
  str: string;
  i: Integer;
begin
  Graphics := TGPGraphics.Create(Handle);
  Graphics.Clear($FFFFFFFF);
  Brush := TGPSolidBrush.Create($FF000000);
  Font := TGPFont.Create(Canvas.Font.Name, 10);

  Rect.Initialize(20, 20, ClientWidth - 40, Font.GetHeight(Graphics));

  StringFormat := TGPStringFormat.Create;
  str := Application.ExeName;
  for i := 0 to 5 do
  begin
    StringFormat.Trimming := TGPStringTrimming(i);
    Graphics.DrawString(str, Font, Rect, StringFormat, Brush);
    Graphics.TranslateTransform(0, Rect.Y + Rect.Height);
  end;
end;

另, 关于 TGPStringFormatFlags (对应 FormatFlags 属性或用于建立参数):
http://msdn.microsoft.com/zh-cn/library/system.drawing.stringformatflags(VS.80).aspx

转载于:https://my.oschina.net/hermer/blog/319200