#93 Wide/Custom dashed lines don't work well

[lbayuk]

Dashed lines, other than the default pattern and unit width, don't work very well. Wider dashed lines, whether default style or customized with SetDefaultDashedStyle(), do not look right at all. Custom pattern unit width lines usually look wrong too, for example SetDefaultDashedStyle('12-4-4-4-4-4') doesn't produce uniform dashes and dots.

Note: This seems to be a problem with GD and there is likely nothing PHPlot can do about it. These have been duplicated in PHP+GD without PHPlot:
(1) Wide dashed lines are simply drawn wrong.
(2) GD does not continue dashed patterns at vertices.

[lbayuk]

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Correction: (2) above is wrong. GD does correctly continue dashed patterns at vertices. The problem is that PHPlot does not draw the line segments that make up a line in order, so GD cannot continue the patterns. And it calls imagesetstyle in between each segment, which resets the dashed pattern pointer. So this part of the problem is in fact in PHPlot, and does not look to be readily fixed.

[lbayuk]

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PHP bug report for item 1, wide dashed lines drawn wrong: http://bugs.php.net/43475