public abstract class LineMetrics extends Object
LineMetrics
class allows access to the metrics needed to layout characters along a line and to layout of a set of lines. A LineMetrics
object encapsulates the measurement information associated with a run of text. Fonts can have different metrics for different ranges of characters. The getLineMetrics
methods of Font
take some text as an argument and return a LineMetrics
object describing the metrics of the initial number of characters in that text, as returned by getNumChars()
.
Modifier | Constructor | Description |
---|---|---|
protected |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
abstract float |
getAscent() |
Returns the ascent of the text. |
abstract int |
getBaselineIndex() |
Returns the baseline index of the text. |
abstract float[] |
getBaselineOffsets() |
Returns the baseline offsets of the text, relative to the baseline of the text. |
abstract float |
getDescent() |
Returns the descent of the text. |
abstract float |
getHeight() |
Returns the height of the text. |
abstract float |
getLeading() |
Returns the leading of the text. |
abstract int |
getNumChars() |
Returns the number of characters ( char values) in the text whose metrics are encapsulated by this LineMetrics object. |
abstract float |
getStrikethroughOffset() |
Returns the position of the strike-through line relative to the baseline. |
abstract float |
getStrikethroughThickness() |
Returns the thickness of the strike-through line. |
abstract float |
getUnderlineOffset() |
Returns the position of the underline relative to the baseline. |
abstract float |
getUnderlineThickness() |
Returns the thickness of the underline. |
protected LineMetrics()
public abstract int getNumChars()
char
values) in the text whose metrics are encapsulated by this LineMetrics
object.char
values) in the text with which this LineMetrics
was created.public abstract float getAscent()
public abstract float getDescent()
public abstract float getLeading()
public abstract float getHeight()
public abstract int getBaselineIndex()
ROMAN_BASELINE
, CENTER_BASELINE
, HANGING_BASELINE
.public abstract float[] getBaselineOffsets()
CENTER_BASELINE
then offsets[HANGING_BASELINE]
is usually negative, offsets[CENTER_BASELINE]
is zero, and offsets[ROMAN_BASELINE]
is usually positive.public abstract float getStrikethroughOffset()
public abstract float getStrikethroughThickness()
public abstract float getUnderlineOffset()
public abstract float getUnderlineThickness()
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/font/LineMetrics.html