const type: font

Interface type for fonts. The font interface is implemented with emptyFont, fontProperties, bitmapFont and vectorFont.

const type: emptyFont

Font implementation type to represent an empty font.

const type: fontProperties

Font implementation type to manage font properties.

const func integer: xHeight (in font: aFont)

Get the height of the letter 'x' for a given font. The height measured in pixels.

Returns:

the pixel height of 'x' for aFont.

const func integer: capHeight (in font: aFont)

Get the height of capital letters for a given font. The height measured in pixels.

Returns:

the capital letter height of aFont.

const func integer: lineHeight (in font: aFont)

Get the height of a font. This is the height necessary to display a line with all chars of a font. The line height is measured in pixels.

Returns:

the line height of aFont.

const func integer: ascent (in font: aFont)

Get the ascent of a font. The ascent is the distance between xHeight and the height of the tallest lower-case letter. The ascent is measured in pixels.

Returns:

the ascent pixels of aFont.

const func integer: descent (in font: aFont)

Get the descent of a font. The descent is the maximum distance that a letter extends below the baseline of a font. The descent is measured in pixels.

Returns:

the descent pixels of aFont.

const func integer: columnWidth (in font: aFont)

Get the maximum column width of a font. The width of all chars in a font is checked to get the maximum column width. The maximum column width is measured in pixels.

Returns:

the maximum column width of aFont.

const func integer: characterSpacing (in font: aFont)

Get the spacing between the chars of a font. The character spacing is measured in pixels.

Returns:

the spacing between the chars of aFont.

const func integer: width (in font: aFont, in string: stri)

Get the pixel width of a string displayed with a font.

Returns:

the pixel width of stri displayed with aFont.

const func integer: numOfCharsInWidth (in font: aFont, in string: stri, in integer: allowedWidth)

If a string is displayed with a font, how many chars fit in a width. The width is specified in pixels. The expression:

numOfCharsInWidth(aFont, stri, width(aFont, stri))

will always be equivalent to

length(stri);

Returns:

the number of chars from stri that fit into allowedWidth if stri is displayed with aFont.

const func integer: compare (in font: font1, in font: font2)

Compare two font values. This function does neither compare font contents nor font names. The order of two fonts is determined by comparing the memory positions of their internal data representation. Therefore the result of compare is arbitrary and may change if the program is executed again. Inside a program the result of compare is consistent and can be used to maintain hash tables.

Returns:

-1, 0 or 1 if the first argument is considered to be respectively less than, equal to, or greater than the second.

const func integer: hashCode (in font: aFont)

Compute the hash value of a font.

Returns:

the hash value.