Re: Where is Tk_GetDash documented?

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...

Comment on Re: Where is Tk_GetDash documented? Download Code

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Re^2: Where is Tk_GetDash documented? by BrowserUk (Patriarch) on Nov 19, 2005 at 04:28 UTC
I really hate to ask this ... Don't. It's a perfectly fair and reasonable question. Yes, I did miss that section before posting. Essentially, I wasn't looking for it because I didn't know it existed. The Canvas docs are sufficiently large that I tend to search for stuff (Arc, Oval, Line etc.) rather than scrolling through linearly. I was looking for wherever Tk_GetGash was documented, as directed by the section of the Canvas docs I was referencing. First I searched the Canvas doc and found half a dozen references, but they are all references to it. None with an explanation. Then I grepped the docs directories and found all the same ones in the Canvas doc, and one other that was also a reference to, not an explanation of either the information or where to find it. If all those references to Tk_GetDash were links or references to the "Dash Patterns" section, I wouldn't have had the problem :). Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal? "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]

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Re^2: Where is Tk_GetDash documented?
by BrowserUk (Patriarch) on Nov 19, 2005 at 04:28 UTC

I really hate to ask this ...

Don't. It's a perfectly fair and reasonable question. Yes, I did miss that section before posting.

Essentially, I wasn't looking for it because I didn't know it existed. The Canvas docs are sufficiently large that I tend to search for stuff (Arc, Oval, Line etc.) rather than scrolling through linearly.

I was looking for wherever Tk_GetGash was documented, as directed by the section of the Canvas docs I was referencing. First I searched the Canvas doc and found half a dozen references, but they are all references to it. None with an explanation.

Then I grepped the docs directories and found all the same ones in the Canvas doc, and one other that was also a reference to, not an explanation of either the information or where to find it.

If all those references to Tk_GetDash were links or references to the "Dash Patterns" section, I wouldn't have had the problem :).

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

[reply]