[whatwg] Comments on <canvas> tag

David Flanagan david at davidflanagan.com
Wed May 17 11:23:48 PDT 2006

What surprises me about the omission of dashed lines is that every 
graphics API I'm familiar with (Xlib, PostScript, Java 2D) supports 
dashed lines. Unless there is some important platform out there that 
does not support them in the underlying graphics library, it seems to me 
that it would have been trivial to add dashed lines to the API.

And, I can't think of any simple or efficient way to simulate dashed 
lines without having them in the API.  And while dashed lines may not be 
a high-use feature, I wouldn't say they're infrequently used.  For 
example: when drawing a line chart with multiple lines which is intended 
to be printed on a black-and-white laser printer.

	David Flanagan

Ian Hickson wrote:
> On Fri, 17 Jun 2005, David Flanagan wrote:
>>Does the <canvas> tag really have no way to draw dashed and dotted 
>>lines?  It seems to have everything else.  Is this an oversight in the 
> Correct, it doesn't have stroke styles other than gradients, patterns, and 
> solid colours. It was an intentional omission since it was not considered 
> a high-use feature. (Similarly, text is not available in Canvas; you have 
> to overlay HTML if you want to mix text with the graphics.)

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