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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi, I’m looking for a little metapost guidance.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I want to redefine the map-connection line, making the line thicker, dashed, with a dot at the start and larger arrowhead at the end. Also a nicer generic arrowhead shape.<o:p></o:p></p><p class=MsoNormal>As the default Therion metapost uses a standard arrow definition for ‘line arrow’ and for ‘line map-connection’ I would like to maintain that efficiency, except I would like the map-connection arrows heads to be two or three times larger than the standard arrow head.<o:p></o:p></p><p class=MsoNormal>So far, with the slightly modified standard Therion code below, I have achieved all of that except for the difference in arrowhead sizes.<o:p></o:p></p><p class=MsoNormal><img width=473 height=68 style='width:4.927in;height:.7083in' id="Picture_x0020_1" src="cid:image001.png@01D3C6D9.8BCF5520"><o:p></o:p></p><p class=MsoNormal>Compare this with the original<o:p></o:p></p><p class=MsoNormal><img width=475 height=69 style='width:4.9479in;height:.7187in' id="Picture_x0020_2" src="cid:image002.png@01D3C6D9.FB384C50"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I expect I could do it by duplicating the l_arrow definition (and call it l_arrowbig for example) , but this seems inefficient. Could I modify the size of the arrowhead with the statement that calls <span style='background:yellow;mso-highlight:yellow'>l_arrow(P,1);</span> ?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Although I’m thinking possibly that is not the best idea, as scaling l_arrow will affect the whole line as well as the arrowhead I expect.<o:p></o:p></p><p class=MsoNormal>Comments?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bruce<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>#ARROW and MAP-CONNECTION REDEFINITIONS<o:p></o:p></p><p class=MsoNormal>#--------------------------<o:p></o:p></p><p class=MsoNormal>code metapost<o:p></o:p></p><p class=MsoNormal>% Q = 0 -- no arrows<o:p></o:p></p><p class=MsoNormal>% 1 -- end<o:p></o:p></p><p class=MsoNormal>% 2 -- begin<o:p></o:p></p><p class=MsoNormal>% 3 -- both<o:p></o:p></p><p class=MsoNormal>def l_arrow (expr P, Q) =<o:p></o:p></p><p class=MsoNormal> T:=identity;<o:p></o:p></p><p class=MsoNormal> pickup PenB;<o:p></o:p></p><p class=MsoNormal> thdraw P;<o:p></o:p></p><p class=MsoNormal> <span lang=FR>p := (-.1u,-.5u)--(0,0)--(.1u,-.5u)--cycle; <o:p></o:p></span></p><p class=MsoNormal> % 0.25 changed to .5 and close end to get nicer arrowhead<o:p></o:p></p><p class=MsoNormal> if odd Q:<o:p></o:p></p><p class=MsoNormal> thfilldraw p rotated (angle(thdir(P,0))+90) <o:p></o:p></p><p class=MsoNormal> shifted (point 0 of P);<o:p></o:p></p><p class=MsoNormal> fi;<o:p></o:p></p><p class=MsoNormal> if Q>1:<o:p></o:p></p><p class=MsoNormal> thfilldraw p rotated (angle(thdir(P,length P))-90) <o:p></o:p></p><p class=MsoNormal> shifted (point infinity of P);<o:p></o:p></p><p class=MsoNormal> fi;<o:p></o:p></p><p class=MsoNormal>enddef;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>def l_mapconnection (expr P) =<o:p></o:p></p><p class=MsoNormal> thdrawoptions(dashed dashpattern(on 1bp off 2bp on 1bp off 2bp) <o:p></o:p></p><p class=MsoNormal> scaled (2 * optical_zoom) withpen PenB);<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> %draw map-connection line with arrowhead at end<o:p></o:p></p><p class=MsoNormal> <span style='background:yellow;mso-highlight:yellow'>l_arrow(P,1); %How to double or triple arrowhead size with this call?</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> %draw dot at start of map-connection line<o:p></o:p></p><p class=MsoNormal> thdraw point infinity of P withpen pencircle scaled 0.3u; <o:p></o:p></p><p class=MsoNormal> %Why infinity and not 0 for start?? <o:p></o:p></p><p class=MsoNormal> %If point before arrow head, then point does not render in legend but does on map?? <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> thdrawoptions();<o:p></o:p></p><p class=MsoNormal>enddef;<o:p></o:p></p><p class=MsoNormal>endcode<o:p></o:p></p></div></body></html>