Interface ILineMetric
interface ILineMetric
Extends com.amazon.apmf.IStandard
Interface containing typographic metrics for a single line of text within a paragraph.
ILineMetric provides detailed measurements used for text layout and rendering, including
positional information (left edge, top edge, height, width), vertical metrics (descent, ascent),
and font-specific measurements (cap height, x-height). These metrics are essential for
precise text positioning, line spacing calculations, and custom text rendering.
Methods
getSize()
Size getSize()
The size of the line.
Returns
Size
The size of the line.
getPoint()
Point getPoint()
The top left corner of the line.
Returns
Point
The top left corner of the line.
getDescent()
double getDescent()
The descent of the line, representing the distance from the baseline to the bottom
of the lowest descending glyph (e.g., ‘g’, ‘p’, ‘y’). Typically a positive value.
Returns
double
The descent value of the line.
getCapHeight()
double getCapHeight()
The cap height of the font, representing the height of uppercase letters (e.g., ‘H’, ‘T’).
Measured from the baseline, typically a negative value. Returns zero if unknown.
Returns
double
The cap height of the font.
getAscent()
double getAscent()
The ascent of the line, representing the recommended distance from the
baseline to the upper typographic boundary of the font.
This value is defined by the font’s metrics (typically the typographic
ascender) and provides enough space for glyphs that extend above the
baseline, such as ascenders, capital letters, and accented characters.
Returns
double
The ascent value of the line.
getXHeight()
double getXHeight()
The x-height of the font, representing the height of lowercase letters without
ascenders or descenders (e.g., ‘x’, ‘a’, ‘e’). Measured from the baseline,
typically a negative value. If it is zero, it means the xHeight is unknown.
Returns
double
The x-height of the font.
getEndIndex()
u64 getEndIndex()
The index of the last character in text string (exclusive).
Can be used to determine which characters belong to this line.
Returns
u64
The index of the text where the line ends.
