com.openhtmltopdf.render

Class LineMetricsAdapter

java.lang.Object

com.openhtmltopdf.render.LineMetricsAdapter

All Implemented Interfaces:

FSFontMetrics

public class LineMetricsAdapter
extends Object
implements FSFontMetrics

A note on this class: What we really want is a FontMetrics2D object (i.e. font metrics with float precision). Unfortunately, it doesn't seem the JDK provides this. However, looking at the JDK code, it appears the metrics contained in the LineMetrics are actually the metrics of the font, not the metrics of the line (and empirically strings of "X" and "j" return the same value for getAscent()). So... for now we use LineMetrics for font metrics.

Constructor Summary

Constructors

Constructor and Description
LineMetricsAdapter(List<Font> fonts, String str, FontRenderContext ctx)

Method Summary

Modifier and Type	Method and Description
float	getAscent()
float	getDescent() In keeping with the JDK LineMetrics convention, this number is positive for values below the baseline.
float	getLineGap() The extra space to leave between consecutive lines (the line gap, also known as external leading), on top of the ascent and descent reported here.
float	getStrikethroughOffset()
float	getStrikethroughThickness()
float	getUnderlineOffset() In keeping with the JDK LineMetrics convention, this number is positive for values below the baseline.
float	getUnderlineThickness()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.openhtmltopdf.render.FSFontMetrics

getTypoDescent

Constructor Detail

LineMetricsAdapter

public LineMetricsAdapter(List<Font> fonts,
                          String str,
                          FontRenderContext ctx)

Method Detail

getAscent

public float getAscent()

Specified by:

getAscent in interface FSFontMetrics

getDescent

public float getDescent()

Description copied from interface: FSFontMetrics

In keeping with the JDK LineMetrics convention, this number is positive for values below the baseline.

Specified by:

getDescent in interface FSFontMetrics

getStrikethroughOffset

public float getStrikethroughOffset()

Specified by:

getStrikethroughOffset in interface FSFontMetrics

getStrikethroughThickness

public float getStrikethroughThickness()

Specified by:

getStrikethroughThickness in interface FSFontMetrics

getUnderlineOffset

public float getUnderlineOffset()

Description copied from interface: FSFontMetrics

In keeping with the JDK LineMetrics convention, this number is positive for values below the baseline.

Specified by:

getUnderlineOffset in interface FSFontMetrics

getUnderlineThickness

public float getUnderlineThickness()

Specified by:

getUnderlineThickness in interface FSFontMetrics

getLineGap

public float getLineGap()

Description copied from interface: FSFontMetrics

The extra space to leave between consecutive lines (the line gap, also known as external leading), on top of the ascent and descent reported here. Browsers add it when computing line-height: normal, so we do too. Zero when no font asks for one.

Where several fonts are in play the ascent and descent above are the largest of each, which taken together can already be more than any one font asks for a line; this is only what is missing on top of them.

Specified by:

getLineGap in interface FSFontMetrics