diff options
Diffstat (limited to 'metapost/context/base/mpiv/mp-tool.mpiv')
| -rw-r--r-- | metapost/context/base/mpiv/mp-tool.mpiv | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/metapost/context/base/mpiv/mp-tool.mpiv b/metapost/context/base/mpiv/mp-tool.mpiv index fc983d5a8..611eafe77 100644 --- a/metapost/context/base/mpiv/mp-tool.mpiv +++ b/metapost/context/base/mpiv/mp-tool.mpiv @@ -3683,3 +3683,48 @@ def yslanted primary s = t endgroup enddef ; + +% By Bogluslaw Jackowski (public domain): +% +% draw hatched (fullcircle scaled 10cm) (45, 4, 1) withcolor "red" ; + +newinternal hatch_match; hatch_match := 1; + +vardef hatched(expr o) primary c = + save a_, b_, d_, l_, i_, r_, za_, zb_, zc_, zd_; + path b_; picture r_; pair za_, zb_, zc_, zd_; + r_ := image ( + a_ := redpart(c) mod 180 ; + l_ := greenpart(c) ; + d_ := -bluepart(c) ; + b_ := o rotated -a_ ; + b_ := + if a_ >= 90 : + (lrcorner b_ -- llcorner b_ -- ulcorner b_ -- urcorner b_ -- cycle) + else : + (llcorner b_ -- lrcorner b_ -- urcorner b_ -- ulcorner b_ -- cycle) + fi + rotated a_ ; + za_ := point 0 of b_ ; + zb_ := point 1 of b_ ; + zc_ := point 2 of b_ ; + zd_ := point 3 of b_ ; + if hatch_match > 0 : + n_ := round(length(zd_-za_) / l_) ; + if n_ < 2: + n_ := 2 ; + fi ; + l_ := length(zd_-za_) / n_ ; + else : + n_ := length(zd_-za_) / l_ ; + fi + save currentpen; pen currentpen ; pickup pencircle scaled d_; + % we use a single path instead: + for i_ := if hatch_match > 0 : 1 else : 0 fi upto ceiling n_ - 1 : + nodraw (i_/n_)[zd_,za_] -- (i_/n_)[zc_,zb_] ; + endfor + dodraw origin ; + ) ; + clip r_ to o; + r_ +enddef; |