Drawing layers need support for alpha channels

Description

Currently MW5 accepts a color value that has an alpha channel, but has to strip this when using the MapWinGIS API.
By adding an optional alpha byte parameter to the drawing layer methods and making use of GDI+ to draw the drawing layers.

Assignee

Mathijs Dumon

Reporter

Mathijs Dumon

Labels

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Epic Link

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Affects versions

None

Fix versions

Priority

Medium
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