Font.GetHeight(const Graphics*) method

项目
03/07/2012

Applies to: desktop apps only

The Font::GetHeight method gets the line spacing of this font in the current unit of a specified Graphics object. The line spacing is the vertical distance between the base lines of two consecutive lines of text. Thus, the line spacing includes the blank space between lines along with the height of the character itself.

Syntax

REAL GetHeight(
  [in]  const Graphics* graphics
) const;

Parameters

graphics [in]
Type: const Graphics*

Pointer to a Graphics object whose unit and vertical resolution are used in the height calculation.

Return value

Type:

Type: REAL

This method returns the line spacing of this font.

Remarks

If the font unit is set to anything other than UnitPixel, the height, in pixels, is calculated using the vertical resolution of the specified Graphics object. For example, suppose the font unit is inches and the font size is 0.3. Also suppose that for the corresponding font family, the em height is 2048 and the line spacing is 2355. If the unit of the Graphics object is UnitPixel and the vertical resolution of the Graphics object is 96 dots per inch, the height is calculated as follows:

2355*(0.3/2048)*96 = 33.1171875

Continuing with the same example, suppose the unit of the Graphics object is something other than UnitPixel, say UnitMillimeter. Then (using 1 inch = 25.4 millimeters) the height, in millimeters, is calculated as follows:

2355*(0.3/2048)25.4 = 8.762256

Examples

The following example creates a Font object, retrieves the height of the Font object, and uses the height to position two lines of text, with the second line directly below the first.

VOID Example_GetHeight(HDC hdc)
{
   Graphics graphics(hdc);

   // Create a Font object.
   Font myFont(L"Arial", 16);

   // Draw text with myFont.
   SolidBrush solidbrush_1(Color(255, 0, 0, 0));
   WCHAR string[] = L"The first line of text";
   graphics.DrawString(string, 22, &myFont, PointF(0, 0), &solidbrush_1);

   // Get the height of myFont.
   REAL height = myFont.GetHeight(&graphics);

   // Draw text immediately below the first line of text.
   SolidBrush solidbrush_2(Color(255, 255, 0, 0));
   WCHAR string[] = L"The second line of text";
   graphics.DrawString(string2, 23, &myFont, PointF(0, height),
                       &solidbrush_2);
}

Requirements

Minimum supported client	Windows XP, Windows 2000 Professional
Minimum supported server	Windows 2000 Server
Product	GDI+ 1.0
Header	Gdiplusheaders.h (include Gdiplus.h)
Library	Gdiplus.lib
DLL	Gdiplus.dll