I really hate to ask this, but did you miss the DASH PATTERNS section in the Canvas docs? I'll reproduce it here for speed:

DASH PATTERNS

Many items support the notion of an dash pattern for outlines.

The first possible syntax is a list of integers. Each element represents the number of pixels of a line segment. Only the odd segments are drawn using the ``outline'' color. The other segments are drawn transparant.

The second possible syntax is a character list containing only 5 possible characters [.,-_ ]. The space can be used to enlarge the space between other line elements, and can not occur as the first position in the string. Some examples:

 -dash .     = -dash [2,4]
 -dash -     = -dash [6,4]
 -dash -.    = -dash [6,4,2,4]
 -dash -..   = -dash [6,4,2,4,2,4]
 -dash '. '  = -dash [2,8]
 -dash ','   = -dash [4,4]

[download]

The main difference of this syntax with the previous is that it it shape-conserving. This means that all values in the dash list will be multiplied by the line width before display. This assures that ``.'' will always be displayed as a dot and ``-'' always as a dash regardless of the line width.

On systems where only a limited set of dash patterns, the dash pattern will be displayed as the most close dash pattern that is available. For example, on Windows only the first 4 of the above examples are available. The last 2 examples will be displayed identically as the first one.

Updated: Whoops! I should have read PerlBear's link a bit more closely...

In reply to Re: Where is Tk_GetDash documented? by rcseege
in thread Where is Tk_GetDash documented? by BrowserUk

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