On May 3, 2012, at 6:32 AM, Alan BRASLAU wrote: I believe that this is somewhat a bug with transparency under MetaFun. For I tried the following:
\startMPcode picture pic ; pic := image(drawarrow origin--(1cm,0)) ; draw pic withtransparency(1,.5) ; draw pic rotated 90 withtransparency(1,.5) ; \stopMPcode Here, the arrowhead is totally opaque and only the "stem" has transparency. Something is fishy. Alan I noticed the same thing. I think original problem is with how an arrow is converted to PDF/Postscript drawing commands and how the color is computed when commands are combined. The only solution I can imagine is to define a new arrow macro that constructs the boundary path of the arrow and fills it (i.e., up one side of the stem, around the arrowhead, and down the other side of the stem). As far as I can tell, MetaPost/Postscript does not have commands that compute the boundary path of the region painted by a sequence of commands. (I think that computing the boundary might be a much harder problem in general than computing which points to paint. A straight arrow would be fairly simple.) Michael ________________________________ This e-mail message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this message (including any attachments) is strictly prohibited. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments).
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