怎样才能在PostScript中获得一个字符串的高度指标？ [英] How can you get the height metric of a string in PostScript?
问题描述
你可以用 stringwidth 来获得当前字体的字符串宽度，虽然这实际上是在栈上推动偏移量坐标，但y值似乎总是没用。有没有一种方法来确定一个字符串的确切高度，可能包括或可能不包括下降？
stringwidth ，就像它说的那样，不会返回字符串的高度。 （在所有的例子中，执行 stringwidth 后的第二个整数是 0 ） stringwidth 在执行（string）show 之后给出当前点的相对坐标。
PLRM有这样的说法： stringwidth ：
< blockquote>
请注意，由 stringwidth 返回的宽度定义为当前
点的移动。它与字形轮廓的尺寸没有任何关系。
那么将会考虑到字符串的高度呢？在PRLM中读到的魔法字是 charpath 和 pathbbox 。试试这个：
％！
/ Helvetica findfont 60 scalefont setfont
200 700 4 0 360 arc fill
200 700 moveto（test test）dup
true charpath pathbbox
3 -1 roll sub 2 div neg 3 1 roll sub 2 div div
200 700 moveto rmoveto show showpage
它计算该字符串的高度，并使用该信息尝试和一个小的实心圆中心的边界框。
You can obtain the width of a string in the current font with stringwidth and although this actually pushes offset coordinates on the stack, the y-value always seems to be useless. Is there a way to determine the exact height of a string, that may or may not include descenders?
stringwidth, as it says, doesn't return string's height. (In all cases I looked at, the second integer on the stack after executing stringwidth was 0 -- for strings that run in horizontal direction.) stringwidth gives the relative coordinates of the currentpoint after executing a (string) show.
The PLRM has this to say about stringwidth:
Note that the width returned by stringwidth is defined as movement of the current point. It has nothing to do with the dimensions of the glyph outlines.
So what would work to take into account the string's height? The magic words to read up about in PRLM are charpath and pathbbox. Try this:
%!
/Helvetica findfont 60 scalefont setfont
200 700 4 0 360 arc fill
200 700 moveto (test test) dup
true charpath pathbbox
3 -1 roll sub 2 div neg 3 1 roll sub 2 div exch
200 700 moveto rmoveto show showpage
It calculates the string's height and uses that info to try and center a small filled circle into the center of its bounding box.
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