| Methods Summary |
|---|
| public int | bytesWidth(byte[] data, int off, int len)Returns the total advance width for showing the specified array
of bytes in this Font. The advance is the
distance from the leftmost point to the rightmost point on the
string's baseline. The advance of a String
is not necessarily the sum of the advances of its characters.
This is equivalent to measuring a String of the
characters in the specified range.
return stringWidth(new String(data, 0, off, len));
|
| public int | charWidth(int codePoint)Returns the advance width of the specified character in this
Font. The advance is the
distance from the leftmost point to the rightmost point on the
character's baseline. Note that the advance of a
String is not necessarily the sum of the advances
of its characters.
This method doesn't validate the specified character to be a
valid Unicode code point. The caller must validate the
character value using {@link
java.lang.Character#isValidCodePoint(int)
Character.isValidCodePoint} if necessary.
if (!Character.isValidCodePoint(codePoint)) {
codePoint = 0xffff; // substitute missing glyph width
}
if (codePoint < 256) {
return getWidths()[codePoint];
} else {
char[] buffer = new char[2];
int len = Character.toChars(codePoint, buffer, 0);
return charsWidth(buffer, 0, len);
}
|
| public int | charWidth(char ch)Returns the advance width of the specified character in this
Font. The advance is the
distance from the leftmost point to the rightmost point on the
character's baseline. Note that the advance of a
String is not necessarily the sum of the advances
of its characters.
Note: This method cannot handle supplementary
characters. To support all Unicode characters, including
supplementary characters, use the {@link #charWidth(int)} method.
if (ch < 256) {
return getWidths()[ch];
}
char data[] = {ch};
return charsWidth(data, 0, 1);
|
| public int | charsWidth(char[] data, int off, int len)Returns the total advance width for showing the specified array
of characters in this Font. The advance is the
distance from the leftmost point to the rightmost point on the
string's baseline. The advance of a String
is not necessarily the sum of the advances of its characters.
This is equivalent to measuring a String of the
characters in the specified range.
return stringWidth(new String(data, off, len));
|
| public int | getAscent()Determines the font ascent of the Font
described by this FontMetrics object. The font ascent
is the distance from the font's baseline to the top of most
alphanumeric characters. Some characters in the Font
might extend above the font ascent line.
return font.getSize();
|
| public int | getDescent()Determines the font descent of the Font
described by this
FontMetrics object. The font descent is the distance
from the font's baseline to the bottom of most alphanumeric
characters with descenders. Some characters in the
Font might extend
below the font descent line.
return 0;
|
| public java.awt.Font | getFont()Gets the Font described by this
FontMetrics object.
return font;
|
| public java.awt.font.FontRenderContext | getFontRenderContext()Gets the FontRenderContext used by this
FontMetrics object to measure text.
Note that methods in this class which take a Graphics
parameter measure text using the FontRenderContext
of that Graphics object, and not this
FontRenderContext
return DEFAULT_FRC;
|
| public int | getHeight()Gets the standard height of a line of text in this font. This
is the distance between the baseline of adjacent lines of text.
It is the sum of the leading + ascent + descent. Due to rounding
this may not be the same as getAscent() + getDescent() + getLeading().
There is no guarantee that lines of text spaced at this distance are
disjoint; such lines may overlap if some characters overshoot
either the standard ascent or the standard descent metric.
return getLeading() + getAscent() + getDescent();
|
| public int | getLeading()Determines the standard leading of the
Font described by this FontMetrics
object. The standard leading, or
interline spacing, is the logical amount of space to be reserved
between the descent of one line of text and the ascent of the next
line. The height metric is calculated to include this extra space.
return 0;
|
| public java.awt.font.LineMetrics | getLineMetrics(java.lang.String str, java.awt.Graphics context)Returns the {@link LineMetrics} object for the specified
String in the specified {@link Graphics} context.
return font.getLineMetrics(str, myFRC(context));
|
| public java.awt.font.LineMetrics | getLineMetrics(java.lang.String str, int beginIndex, int limit, java.awt.Graphics context)Returns the {@link LineMetrics} object for the specified
String in the specified {@link Graphics} context.
return font.getLineMetrics(str, beginIndex, limit, myFRC(context));
|
| public java.awt.font.LineMetrics | getLineMetrics(char[] chars, int beginIndex, int limit, java.awt.Graphics context)Returns the {@link LineMetrics} object for the specified
character array in the specified {@link Graphics} context.
return font.getLineMetrics(
chars, beginIndex, limit, myFRC(context));
|
| public java.awt.font.LineMetrics | getLineMetrics(java.text.CharacterIterator ci, int beginIndex, int limit, java.awt.Graphics context)Returns the {@link LineMetrics} object for the specified
{@link CharacterIterator} in the specified {@link Graphics}
context.
return font.getLineMetrics(ci, beginIndex, limit, myFRC(context));
|
| public int | getMaxAdvance()Gets the maximum advance width of any character in this
Font. The advance is the
distance from the leftmost point to the rightmost point on the
string's baseline. The advance of a String is
not necessarily the sum of the advances of its characters.
return -1;
|
| public int | getMaxAscent()Determines the maximum ascent of the Font
described by this FontMetrics object. No character
extends further above the font's baseline than this height.
return getAscent();
|
| public java.awt.geom.Rectangle2D | getMaxCharBounds(java.awt.Graphics context)Returns the bounds for the character with the maximum bounds
in the specified Graphics context.
return font.getMaxCharBounds(myFRC(context));
|
| public int | getMaxDecent()For backward compatibility only.
return getMaxDescent();
|
| public int | getMaxDescent()Determines the maximum descent of the Font
described by this FontMetrics object. No character
extends further below the font's baseline than this height.
return getDescent();
|
| public java.awt.geom.Rectangle2D | getStringBounds(java.lang.String str, java.awt.Graphics context)Returns the bounds of the specified String in the
specified Graphics context. The bounds is used
to layout the String.
Note: The returned bounds is in baseline-relative coordinates
(see {@link java.awt.FontMetrics class notes}).
return font.getStringBounds(str, myFRC(context));
|
| public java.awt.geom.Rectangle2D | getStringBounds(java.lang.String str, int beginIndex, int limit, java.awt.Graphics context)Returns the bounds of the specified String in the
specified Graphics context. The bounds is used
to layout the String.
Note: The returned bounds is in baseline-relative coordinates
(see {@link java.awt.FontMetrics class notes}).
return font.getStringBounds(str, beginIndex, limit,
myFRC(context));
|
| public java.awt.geom.Rectangle2D | getStringBounds(char[] chars, int beginIndex, int limit, java.awt.Graphics context)Returns the bounds of the specified array of characters
in the specified Graphics context.
The bounds is used to layout the String
created with the specified array of characters,
beginIndex and limit.
Note: The returned bounds is in baseline-relative coordinates
(see {@link java.awt.FontMetrics class notes}).
return font.getStringBounds(chars, beginIndex, limit,
myFRC(context));
|
| public java.awt.geom.Rectangle2D | getStringBounds(java.text.CharacterIterator ci, int beginIndex, int limit, java.awt.Graphics context)Returns the bounds of the characters indexed in the specified
CharacterIterator in the
specified Graphics context.
Note: The returned bounds is in baseline-relative coordinates
(see {@link java.awt.FontMetrics class notes}).
return font.getStringBounds(ci, beginIndex, limit,
myFRC(context));
|
| public int[] | getWidths()Gets the advance widths of the first 256 characters in the
Font. The advance is the
distance from the leftmost point to the rightmost point on the
character's baseline. Note that the advance of a
String is not necessarily the sum of the advances
of its characters.
int widths[] = new int[256];
for (char ch = 0 ; ch < 256 ; ch++) {
widths[ch] = charWidth(ch);
}
return widths;
|
| public boolean | hasUniformLineMetrics()Checks to see if the Font has uniform line metrics. A
composite font may consist of several different fonts to cover
various character sets. In such cases, the
FontLineMetrics objects are not uniform.
Different fonts may have a different ascent, descent, metrics and
so on. This information is sometimes necessary for line
measuring and line breaking.
return font.hasUniformLineMetrics();
|
| private static native void | initIDs()Initialize JNI field and method IDs
|
| private java.awt.font.FontRenderContext | myFRC(java.awt.Graphics context)
if (context instanceof Graphics2D) {
return ((Graphics2D)context).getFontRenderContext();
}
return DEFAULT_FRC;
|
| public int | stringWidth(java.lang.String str)Returns the total advance width for showing the specified
String in this Font. The advance
is the distance from the leftmost point to the rightmost point
on the string's baseline.
Note that the advance of a String is
not necessarily the sum of the advances of its characters.
int len = str.length();
char data[] = new char[len];
str.getChars(0, len, data, 0);
return charsWidth(data, 0, len);
|
| public java.lang.String | toString()Returns a representation of this FontMetrics
object's values as a String.
return getClass().getName() +
"[font=" + getFont() +
"ascent=" + getAscent() +
", descent=" + getDescent() +
", height=" + getHeight() + "]";
|
Note that the implementations of these methods are
inefficient, so they are usually overridden with more efficient
toolkit-specific implementations.