Package org.antlr.v4.gui
Class BasicFontMetrics
java.lang.Object
org.antlr.v4.gui.BasicFontMetrics
- Direct Known Subclasses:
SystemFontMetrics
Font metrics. The only way to generate accurate images
in any format that contain text is to know the font metrics.
Specifically, we need to know the width of every character and the
maximum height (since we want all characters to fit within same line height).
I used ttf2tfm to dump the font metrics from Mac TrueType fonts and
then converted that to a Java class for use in a PostScript generator
for trees. Commands:
$ ttf2tfm /Library/Fonts/Arial\ Black.ttf > metricsThen run metrics into python code after stripping header/footer:
# # Process lines from ttf2tfm that look like this: # Glyph Code Glyph Name Width llx lly urx ury # ------------------------------------------------------------------------ # 3 00020 space 333 0, 0 -- 0, 0 # lines = open("metrics").read().split('\n') print "public class FontName {" print " {" maxh = 0; for line in lines[4:]: # skip header 0..3 all = line.split(' ') words = [x for x in all if len(x)>0] ascii = int(words[1], 16) height = int(words[8]) if height>maxh: maxh = height if ascii>=128: break print " widths[%d] = %s; // %s" % (ascii, words[3], words[2]) print " maxCharHeight = "+str(maxh)+";" print " }" print "}"Units are 1000th of an 'em'.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final int
protected int
protected int[]
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiondouble
getLineHeight
(int fontSize) double
getWidth
(char c, int fontSize) double
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Field Details
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MAX_CHAR
public static final int MAX_CHAR- See Also:
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maxCharHeight
protected int maxCharHeight -
widths
protected int[] widths
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Constructor Details
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BasicFontMetrics
public BasicFontMetrics()
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Method Details
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getWidth
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getWidth
public double getWidth(char c, int fontSize) -
getLineHeight
public double getLineHeight(int fontSize)
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