WinAPI: CreateFontIndirect - 根据字体结构建立逻辑字体

//声明:
CreateFontIndirect(
const p1: TLogFont {字体结构}
): HFONT;            {返回新字体指针}

//TLogFont 是 tagLOGFONTA 结构的重定义:
tagLOGFONTA = packed record
lfHeight: Longint;      {字体高度}
lfWidth: Longint;       {字体平均宽度}
lfEscapement: Longint;  {角度, 单位是 1/10 度}
lfOrientation: Longint; {基线角度}
lfWeight: Longint;      {粗体, 取值: 0-1000}
lfItalic: Byte;         {斜体}
lfUnderline: Byte;      {下划线}
lfStrikeOut: Byte;      {删除线}
lfCharSet: Byte;        {字符集}
lfOutPrecision: Byte;   {输出精度}
lfClipPrecision: Byte;  {剪裁精度}
lfQuality: Byte;        {输出质量}
lfPitchAndFamily: Byte; {间距及字族}
lfFaceName: array[0..LF_FACESIZE - 1] of AnsiChar; {字样名称}
end;

//例1:
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var
FontInfo: TLogFont; {声明字体结构}
FH1,FH2: HFONT;     {声明字体句柄}
const
str = '万一的 Delphi 博客';
begin
{定义字体特征}
FontInfo.lfHeight := 0;     {赋值 0, 系统自动给一个值}
FontInfo.lfWidth := 0;      {赋值 0, 系统自动给一个值}
FontInfo.lfEscapement := 0; {无角度}
FontInfo.lfWeight := 500;   {中等加粗}
FontInfo.lfItalic := 0;     {非斜体}
FontInfo.lfUnderline := 0;  {无下划线}
FontInfo.lfStrikeOut := 0;  {无删除线}
FontInfo.lfFaceName := '宋体';

FH1 := CreateFontIndirect(FontInfo);
FH2 := SelectObject(Canvas.Handle, FH1);
{用 CreateFontIndirect 建立逻辑字体; 用 SelectObject 选人设备; 并返回字体句柄}

TextOut(Canvas.Handle, X, Y, str, Length(str));

DeleteObject(FH1);
DeleteObject(FH2);
end;

//效果图:

//例2: 扁字
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var
FontInfo: TLogFont;
FH1,FH2: HFONT;
const
str = '万一的 Delphi 博客';
begin
FontInfo.lfHeight := 0;
FontInfo.lfWidth := 12;     {只修改了此处}
FontInfo.lfEscapement := 0;
FontInfo.lfWeight := 500;
FontInfo.lfItalic := 0;
FontInfo.lfUnderline := 0;
FontInfo.lfStrikeOut := 0;
FontInfo.lfFaceName := '宋体';

FH1 := CreateFontIndirect(FontInfo);
FH2 := SelectObject(Canvas.Handle, FH1);

TextOut(Canvas.Handle, X, Y, str, Length(str));

DeleteObject(FH1);
DeleteObject(FH2);
end;

//效果图:

//例3: 长字
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var
FontInfo: TLogFont;
FH1,FH2: HFONT;
const
str = '万一的 Delphi 博客';
begin
FontInfo.lfHeight := 32;    {修改了此处}
FontInfo.lfWidth := 12;
FontInfo.lfEscapement := 0;
FontInfo.lfWeight := 500;
FontInfo.lfItalic := 0;
FontInfo.lfUnderline := 0;
FontInfo.lfStrikeOut := 0;
FontInfo.lfFaceName := '宋体';

FH1 := CreateFontIndirect(FontInfo);
FH2 := SelectObject(Canvas.Handle, FH1);

TextOut(Canvas.Handle, X, Y, str, Length(str));

DeleteObject(FH1);
DeleteObject(FH2);
end;

//效果图:

//例4: 旋转
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var
FontInfo: TLogFont;
FH1,FH2: HFONT;
const
str = '万一的 Delphi 博客';
begin
FontInfo.lfHeight := 0;
FontInfo.lfWidth := 0;
FontInfo.lfEscapement := 450; {修改了此处}
FontInfo.lfWeight := 500;
FontInfo.lfItalic := 0;
FontInfo.lfUnderline := 0;
FontInfo.lfStrikeOut := 0;
FontInfo.lfFaceName := '宋体';

FH1 := CreateFontIndirect(FontInfo);
FH2 := SelectObject(Canvas.Handle, FH1);

TextOut(Canvas.Handle, X, Y, str, Length(str));

DeleteObject(FH1);
DeleteObject(FH2);
end;

//效果图:

//一个利用角度的示例:
procedure TForm1.FormPaint(Sender: TObject);
var
FontInfo: TLogFont;
FH1,FH2: HFONT;
x,y,i: Integer;
const
str = '万一的 Delphi 博客';
begin
FontInfo.lfHeight := 0;
FontInfo.lfWidth := 0;
FontInfo.lfEscapement := 0;
FontInfo.lfWeight := 1000;
FontInfo.lfItalic := 0;
FontInfo.lfUnderline := 0;
FontInfo.lfStrikeOut := 0;
FontInfo.lfFaceName := '宋体';

x := ClientWidth div 2;
y := ClientHeight div 2;

SetBkMode(Canvas.Handle, TRANSPARENT);

i := 0;
while i<360 do
begin
FontInfo.lfEscapement := i * 10;
FH1 := CreateFontIndirect(FontInfo);
FH2 := SelectObject(Canvas.Handle, FH1);
TextOut(Canvas.Handle, X, Y, str, Length(str));
Inc(i,10);
end;

DeleteObject(FH1);
DeleteObject(FH2);
end;

//效果图: