diff options
Diffstat (limited to 'metapost')
| -rw-r--r-- | metapost/context/base/mpiv/mp-tool.mpiv | 110 |
1 files changed, 108 insertions, 2 deletions
diff --git a/metapost/context/base/mpiv/mp-tool.mpiv b/metapost/context/base/mpiv/mp-tool.mpiv index 34984465f..478680d5e 100644 --- a/metapost/context/base/mpiv/mp-tool.mpiv +++ b/metapost/context/base/mpiv/mp-tool.mpiv @@ -1181,8 +1181,53 @@ enddef ; %D Interesting too: +% primarydef p paralleled d = ( +% p shifted if d < 0 : - fi ((point abs(d) on (p rotatedaround(point 0 of p,90))) - point 0 of p) +% ) enddef ; +% +% primarydef p paralleled d = ( +% p shifted ((d*unitvector(direction 0 of p) - point 0 of p) rotated 90) +% ) enddef ; +% +% Alan came up with an improved version and stepwise we ended up with (or +% might up with a variant of): + +vardef perpendicular expr t of p = + unitvector((direction t of p) rotated 90) +enddef ; + +def istextext(expr p) = + (path p and ((substring(0,3) of prescriptpart p) = "tx_")) +enddef ; + primarydef p paralleled d = ( - p shifted if d < 0 : - fi ((point abs(d) on (p rotatedaround(point 0 of p,90))) - point 0 of p) + if path p : + begingroup ; + save dp ; pair dp ; + for i=0 upto length p if cycle p : -1 fi : + hide(dp := d * perpendicular i of p) + if i > 0 : .. fi + (point i of p + dp) + if i < length p : + .. controls (postcontrol i of p + dp) and + (precontrol (i+1) of p + dp) + fi + endfor + if cycle p : .. cycle fi + endgroup + elseif picture p : + image( + for i within p : + draw (pathpart i) + if not istextext(i) : % dirty trick + paralleled d + fi + mfun_decoration_i i ; + endfor ; + ) + elseif pair p : + p + fi ) enddef ; vardef punked primary p = @@ -1268,6 +1313,7 @@ enddef ; newinternal ahvariant ; ahvariant := 0 ; newinternal ahdimple ; ahdimple := 1/5 ; +newinternal ahscale ; ahscale := 3/4 ; vardef arrowhead expr p = save q, e, r ; @@ -1310,7 +1356,8 @@ def resetarrows = ahangle := 45 ; ahvariant := 0 ; ahdimple := 1/5 ; - ) + ahscale := 3/4 ; +) enddef ; %D Points. @@ -1713,6 +1760,65 @@ def mfun_draw_arrow_picture_double text t = endgroup ; enddef ; +%D Some more arrow magic, by Alan: + +def drawdoublearrows expr p = + begingroup ; + save mfun_arrow_path ; + path mfun_arrow_path ; + save mfun_arrow_path_parallel ; + path mfun_arrow_path_parallel ; + if path p : + mfun_arrow_path := p ; + expandafter mfun_draw_arrow_paths + elseif picture p : + save mfun_arrow_picture ; + picture mfun_arrow_picture ; + mfun_arrow_picture := p ; + expandafter mfun_draw_arrow_pictures + else : + expandafter mfun_draw_arrow_nothing + fi +enddef ; + +def mfun_draw_arrow_paths text t = + if autoarrows : + set_ahlength(t) ; + fi + save d ; d := ahscale*ahlength*sind(ahangle/2) ; + mfun_arrow_path_parallel := mfun_arrow_path paralleled d ; + draw arrowpath mfun_arrow_path_parallel t ; + fillup arrowhead mfun_arrow_path_parallel t ; + mfun_arrow_path_parallel := (reverse mfun_arrow_path) paralleled d ; + draw arrowpath mfun_arrow_path_parallel t ; + fillup arrowhead mfun_arrow_path_parallel t ; + endgroup ; +enddef ; + +def mfun_draw_arrow_pictures text t = + if autoarrows : + set_ahlength(t) ; + fi + save d ; d := ahscale*ahlength*sind(ahangle/2) ; + mfun_with_arrow_picture( + if mfun_arrow_count = 1 : + draw (mfun_arrow_path paralleled d) mfun_decoration_i i t ; + mfun_arrow_path_parallel := (reverse mfun_arrow_path) paralleled d ; + draw arrowpath mfun_arrow_path_parallel mfun_decoration_i i t ; + fillup arrowhead mfun_arrow_path_parallel mfun_decoration_i i t ; + elseif mfun_arrow_count = mfun_arrow_snippets : + draw ((reverse mfun_arrow_path) paralleled d) mfun_decoration_i i t ; + mfun_arrow_path_parallel := mfun_arrow_path paralleled d ; + draw arrowpath mfun_arrow_path_parallel mfun_decoration_i i t ; + fillup arrowhead mfun_arrow_path_parallel mfun_decoration_i i t ; + else : + draw ( mfun_arrow_path paralleled d) mfun_decoration_i i t ; + draw ((reverse mfun_arrow_path) paralleled d) mfun_decoration_i i t ; + fi + ) + endgroup ; +enddef ; + %D Handy too ...... vardef pointarrow (expr pat, loc, len, off) = |