Copying Picturebox Contents With BitBlit?

[TheAmplifier]

Hi all! Got another question for all you guys out there. First, let explain what I've got and then what I want to do.

First off, I have a graphic that is solid (no transparency), that I have moving underneath a transparent graphic (made transparent with BitBlt).

I've gotten it to SRCCOPY the solid picture first to a picturebox, then SRCAND and SRCPAINT the one with transparency on top of it. Then, I SRCCOPY the whole image to another PictureBox which I'm using as the drawing plane. By changing the Y coordinates of the SRCCOPY when copying the solid image, it appears that it is moving up and down. So, it looks a lot like a shutter door opening and closing. So far, so good.

The problem I'm running into is this... when the "door" goes back up, revealing what's underneath, I can't seem to get anything to show up! I want to cover up controls with the door, and then reveal new controls as the door opens.

Is there any way to do this? So far, when I try to SRCCOPY the picturebox with the controls on it, it only copies the picturebox's background.

Any help would be great!

- Amp

[Fox]

As I understood that right you need to make buffers to store each 'layer' of your game. So you'll have 1 layer/buffer for the backgrouns and 1 for objects (like the door). Now when you draw the game you first copy the background layer, then the doors. This will prevent the door from overwriting the background and you won't get into problems...

See my animation demo if you need an example

[TheAmplifier]

That's pretty much what I'm doing, but on the background layer I have regular VB controls (textbox, buttons, etc). When I draw the background layer, none of the controls get drawn along with it!

All I'm looking for really is a way to draw the controls underneath the door layer and on top of the background layer (I think).

- Amp

[Sastraxi]

Unfortunately that's a really hard question

My advice is to scroll the PICTUREBOX ITSELF up and down, as BitBlt draws to the picture, the picture draws to the form, etc. so you should change the PICTUREBOX itself.

To do this, you must set a WINDOW REGION for the hWnd of the picturebox. I can post some code on how to do this.

[Sastraxi]

Declarations:

Public Declare Function CreatePolygonRgn Lib "gdi32" _
(lpPoint As POINTAPI, ByVal nCount As Long, ByVal _
nPolyFillMode As Long) As Long

Public Declare Function CreatePolyPolygonRgn Lib "gdi32" _
(lpPoint As POINTAPI, lpPolyCounts As Long, ByVal nCount As _
Long, ByVal nPolyFillMode As Long) As Long

Public Declare Function CombineRgn Lib "gdi32" _
(ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, _
ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long

Public Declare Function SetWindowRgn Lib "user32" _
(ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long

Public Declare Function DeleteObject Lib "gdi32" _
(ByVal hObject As Long) As Long

This code works very much like using AREAS in an IMAGE MAP in HTML, if you've ever used that. But don't take it from me; take it from VB-WORLD because that's where I got this code from
(http://www.vbworld.com/articles/shapedforms/index3.html)

At the above link it will show you how to use them; good luck!
And also make sure in SetWindowRgn you have like Picture1.hWnd as hWnd.

[TheAmplifier]

Thanks! I'll try this out when I get back in a while.

[TheAmplifier]

Looks like that's going to work for me, I'll just have to play around with it a bit.

Thanks for the help!

[Sastraxi]

Always here

24 hours a day, unfortunately