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Marius Kintel wrote:
On Apr 1, 2008, at 1:54 PM, jean-pierre charras - INPG wrote:This is *exactly* the case. I never used blend/alpha functionality instead of OR mode (it did not exists when i started kicad), but i think this is a good idea.Thanks for clearing this up :)Since COPY may hide some layers, we should have some kind of blending functionality. However, this is probably not critical, so using COPY for now (only for the Mac port) is a good start I think.But moving objects still must use the XOR mode (i am not sure full redraw of the screen when moving an object is useable for large and complex boards)
Yes XOR is used everywhere. The good news is that wxXOR seems to be supported on the MAC, so the only problem is wxOR. I again wish to point out the possible alternative which is to draw the current layer last. I went through the BOARD drawing code last night and think this is a viable option. In fact it may be an attractive option to support as a dynamically selectable toggle, sort of like the "High Contrast Mode" can be temporarily selected. In any case we might want to try it and then decide.
Here are my thoughts on implementation:**Any time you change layers, the screen gets redrawn with the current layer on top, including a via initiated layer change.
**We put a BOARD_ITEM* vector into the frame window or drawpanel or BOARD to record objects which are on the current layer. And this is cleared at the beginning of the main drawing handler.
**Any drawing code which iterates over BOARD_ITEMs checks the layer and either calls BOARD_ITEM::Draw() or puts that BOARD_ITEM* into the vector if it is on the current layer.
**Then the iterating drawing code simply draws all the items in the vector, they should already be in the proper sequence, and they now all have a polymorphic Draw function as of last night. The vector capacity will tend to expand to proper size and then stay there on subsequent calls.
The highlight and high contrast modes might cause some wrinkles in this plan but I think we can iron those out.
The reason I take such time to elaborate this idea is because I think this *might* be a valuable feature for any OS platform (but I might be wrong). There are times where I just don't want to take time to turn off the display of layers that are getting in my way. It might be a better, more stream-lined UI experience to simply put the layer of interest "on top" conceptually.
Dick
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