parskipspacing
I am a bit confused about what characteristics of the page are controlled by: \parskip, \baselineskip, \topskip.`
\parskip` controls the space between paragraphs but is it the same value all across the document? It seems, for example, to have a different value in a paragraph between title and subtitle that in one between subtitle and text. Is this right?
Are there simple ways to control all different “parskips” in the .tex file?
Some examples about those three will be welcome.
Not a complete answer, but a (hopefully) useful hint: The observed inattentiveness of the parskip=full class option to a change of \baselinestretch seems to be caused by the fontspec package. The following example (compiled with XeLaTeX, fontspec commented out) yields a value for \parskip of about 17.4 pt (i.e., the same as \baselineskip).
\documentclass[a4paper,12pt,parskip=full]{scrartcl}
% \usepackage{fontspec}
\linespread{1.2}
\begin{document}
lineskip: \the\lineskip\\
baselineskip: \the\baselineskip\\
baselinestretch: \baselinestretch\\
parskip: \the\parskip\\
\end{document}
You asked for a LuaTeX solution and you get one:
\documentclass{article}
\usepackage{luatexbase,luacode}
\begin{luacode}
local PENALTY=node.id("penalty")
last_line_twice_parindent = function (head)
while head do
local _w,_h,_d = node.dimensions(head)
if head.id == PENALTY and head.subtype ~= 15 and (_w < 2 * tex.parindent) then
-- we are at a glue and have less than 2*\parindent to go
local p = node.new("penalty")
p.penalty = 10000
p.next = head
head.prev.next = p
p.prev = head.prev
head.prev = p
end
head = head.next
end
return true
end
luatexbase.add_to_callback("pre_linebreak_filter",last_line_twice_parindent,"Raphink")
\end{luacode}
\begin{document}
\parindent = 2cm
\emergencystretch = \hsize
A wonderful serenity has taken possession of my entire soul, like these sweet mornings of spring which I enjoy with my whole heart. I am alone, and feel.
The charm of existence in this spot, which was created for the bliss of souls like mine.
I am so happy, my dear friend, so absorbed in the exquisite sense of mere tranquil existence, that I neglect my talents. I should be
incapable of drawing a single stroke at the present moment; and yet I feel that I never was a greater artist than now.
\end{document}
What it does is it adds ties (~) between the words at the end of a paragraph, when the distance to the end is less then 2*\parindent. If the \parindent is large enough, the paragraphs will get ugly.
Note: this does not prevent hyphenation. So the minimal amount is not enforced by an hbox or so. This is an exercise left to the ambitious reader.
Edit: do not hardcode glyph ids...
Best Answer
\parskipadds some "glue" between each paragraph. As I understand it, "glue" in LaTeX means, that it is not something fixed but it can adapt a bit according to what fills the space on a page best. This vertical empty space is inserted between every paragraph but not before the first or after the last one on a page. But it does influence the spacing between eg. a section heading and the beginning of the text.There is a package called
parskipwhich should be used if you want to use spacing between paragraphs instead of indentation in the standard classes likearticle.\baselineskipinfluences the spaceing between two lines. But if you want to change the linespreading you should instead use the packagesetspacebecause that changes the linespacing for text but excludes captions, footnotes etc. from the setting which is normally wanted.\topskipspecifies the vertical spacing of the first line of a page in relation to the default.\parindentby default LaTeX indents every paragraph except from the first one after a new heading. The indentation of the other paragraphs can be changed with this command.For comparison lets look at a default
\documentclass{article}in LaTeX (with the packageshowframeto visualise the separation at the top)and one where we set