dashed arrows not dashed in canvasdraw

[byache]

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Hello,
I think there is a miscellaneous with the « dashed » keyword in canvasdraw : in the example bellow, the green arrow appears not dashed.

\text{sol=wims(exec canvasdraw
  size 750,450
  xrange -15,15
  yrange -9,9
  opacity 155,155
  linewidth 1
  grid 1,1,grey
  opacity 255,255
  linewidth 2
  fontfamily 18px Arial
  dashtype 2,2
  darrow -5,2,3,5,10,blue
  arrow -5,6,1,2,10,red
  darrow 5,4,7,3,10,green
  )}
\statement{\sol}

The doc recommands to write

dashed
arrow ...

but the result is the same.

If I change the color, same problem but if I change any coordinates, I strangely may obtain the dashed…

[bernadette]

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Si on met
dashtype 2,5
ou
dashtype 2,1
au lieu de
dashtype 2,2

il me semble que cela fonctionne! je ne dis pas cela pour que tu le fasse, mais cela peut être aider pour le débogage si bogue il y a ?

Bernadette

[jm.evers]

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Hi,

This is clearly a bug in canvasdraw arrow(s)
I will have to look into this…and see if there are any other mis behaviours with dashing,,,
(other primitives like lines,hlines,segments etc do not show this error)

size 400,400
xrange -10,10
yrange -10,10
linewidth 2
dashtype 4,2
dsegment 0,0,5,5,red
dsegment 0,0,-5,5,blue
dsegment 0,0,5,-5,green
dsegment 0,0,-5,-5,orange
dashtype 2,6
dhline 0,-5,red
dhline 0,-4,blue
dhline 0,-3,green
dhline 0,-2,orange
dvline -5,0,red
dvline -4,0,blue
dvline -3,0,green
dvline -2,0,orange

joke

• Cette réponse a été modifiée le il y a 3 années et 9 mois par jm.evers.

[jm.evers]

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Hi,
helas this is not a bug of canvasdraw, but it seems that the html5 canvas implementation of dashing is somewhat troublesome.
The dashing may even be different on different browsers
For now there is no -easy- way to correct this in canvasdraw.

joke

[jm.evers]

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Uploaded to SVN a slightly improved version of canvasdraw

• dashing will still depend on angle of the object (html5 canvas ‘flaw’)
• dashing will still depend on individual browser
• corrected dashing in userdraw,multidraw
• corrected arrow head (it was dashed…)

Thank you for noticing !
(and please keep kicking it to find flaws and bugs !)

joke

[Auteur]

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