CODEWITHSUNDEEP
python-2.7colorspygame
user4813927
user4813927

Reputation:

Pygame invisible Color

Is there any way of defining an invisible Color in pygame, so that calling it on screen.fill(invisibleColor,pygame.mouse.get_pos()) wouldn't cover the drawings behind it?

Upvotes: 1

Views: 384

Answers (1)

SteJ
SteJ

Reputation: 1531

There are three different methods for transparency in Python; looking at The documentation for fill it looks like you will need to pass the special flags into the last parameter to support whichever transparency method you are using.

What I found useful was to use the convert_alpha() function Documented here rather than convert on my surfaces; I discovered that in my case the transparency wasn't working because I was using regular convert.

ADDITIONAL:

I'm not 100% clear on what you are trying to achieve, but it occurs to me that you may mean you want only a rectangle under the mouse to be visible and you mean to use transparency to do that. If that is the case there are a couple of problems:

  • A transparent colour is just that - transparent - drawing it over an existing sold rectangle will allow you to see that solid rectangle through your transparent colour; in other words it will be exactly the same as not having that rectangle drawn in the first place
  • You will be drawing an entire screen and then covering it; this will be slow.

If this is what you are trying to achieve, you may do better to just render a smaller surface (the bit that's under the mouse) and draw that to the screen over your solid background.

If you really do want to draw a solid rectangle with a hole under the mouse you will need to draw four rectangles like this (sorry for the ascii art):

 +------------------+
 |        1         |
 +------+---+-------+
 |  2   | m |   3   |
 +------+---+-------+
 |        4         |
 +------------------+

That way the bit of the screen under the mouse (marked m in the 'diagram') will not be covered by your solid colour, but the rectangles 1,2,3&4 will all appear to be one solid rectangle (with a hole under the mouse).

Hope this helps refine the answer to suit your needs.

Upvotes: 2

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