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Index > Windows > Draw Rectangle directly on the screen without a window?

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upsurt



Joined: 14 Jan 2014
Posts: 51
upsurt
revolution wrote:
badc0de02 wrote:
or just simply get A new Screenshot to every drawing cycle and REPLACE IT SIMPLY?
A new screen shot would have the rectangle on it thus defeating the purpose.


I quess

A:
- inc x
- inc y
- take screenshot
- paint the rectangle to x,y
- restore the screen with help of the screenshot
jmp A

but still, highly dynamic content might suffer actuallity ... Sad


Last edited by upsurt on 28 Jul 2014, 20:35; edited 1 time in total
Post 28 Jul 2014, 19:02
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system
revolution
upsurt wrote:
I quess

A:
- inc x
- inc y
- take screenshot
- paint the rectangle to x,y
- restore the screen with help of the screenshot
jmp A

but still, highly dinamic content might suffer actuallity ... Sad
And the flickering would be terrible.
Post 28 Jul 2014, 19:09
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upsurt



Joined: 14 Jan 2014
Posts: 51
upsurt
how about od drawing an transparent window (without border or anything) and just paint the rectangle on top of this window?

what do you think?
Post 28 Jul 2014, 20:36
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system
revolution
Using transparency is the usual technique used for non-rectangular windows. There are tutorials about such things dating back from the days of the original Win95.

If your window is going to be rectangular then there is no advantage to using transparency. Just use a normal window.
Post 28 Jul 2014, 21:05
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1409
Location: Toronto, Canada
AsmGuru62
So, the main question is: why not use a window?
Post 28 Jul 2014, 21:49
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upsurt



Joined: 14 Jan 2014
Posts: 51
upsurt
actually, I wanted to paint directly on the screen. so a window is not directly the same.
it works for me so far with point, line and rectangle ... but I get it only in black and have some trouble toremove it properly.
Post 28 Jul 2014, 22:14
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system
revolution
If you give your window the WS_EX_TOPMOST flag then you will be painting directly to the screen since it will obscure all windows behind it. The only difference between what you are doing and a WS_EX_TOPMOST window is that other windows with the WS_EX_TOPMOST flag (if you have any) could overlap it if they are higher in the Z-order.
Post 28 Jul 2014, 22:38
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1409
Location: Toronto, Canada
AsmGuru62
Also, if you set the window style to exclude borders and title - then it will be the same rectangle you just painted.
Post 29 Jul 2014, 14:45
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typedef



Joined: 25 Jul 2010
Posts: 2913
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typedef
revolution wrote:
upsurt wrote:
<snip>

But they don't clean the whole rectangle, only a part. So they will be a black part left. Sad

WHY??
Because the OS uses a lot of optimisations to make things more efficient. But when you do thing manually without informing the OS about changes then things get out of sync.

BTW: If you used a formal window then you won't have this problem.


Or just create a message loop.
Post 08 Aug 2014, 13:05
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