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Help => Graphics => Topic started by: Perde on May 03, 2011, 04:57:50 pm

Title: Image::Copy causing crash.
Post by: Perde on May 03, 2011, 04:57:50 pm

Heyo!

Okay, after deleting my first thread this will be my new first one.  :D

Once again, I'm quite new to programming, so please excuse if my problems might be caused by my wrong understanding.

My problem is the following:
I'm trying to create an Image of variable size that copies certain information from a "dummy-image". My problem occurs while trying to slice the dummy into four parts and copy each part into the corresponding corners of the new Image.

My actual try looks something like this:

Code: [Select]

NI ... The new (variable) image.
DI ... The dummy.
NW/NH ... New image Width/Height
DW/DH ... Dummy Width/Height

NI.Create(...)
NI.Copy(DI, 0, 0, rect(0, 0, DW/2, DH/2))
NI.Copy(DI, NW-DW/2, 0, rect(DW/2, 0, DW/2, DH/2))
NI.Copy(DI, 0, NH-DH/2, rect(0, DH/2, DW/2, DH/2))
NI.Copy(DI, (NW-DW/2)-2, NH-DH/2, rect(DW/2, DH/2, DW/2, DH/2))


The dummy looks like this:
(http://img808.imageshack.us/img808/8427/00013y.png)

And the code is creating this:
(http://img90.imageshack.us/img90/7228/outcomeu.png)

The crash seems to be caused by the last line (responsible for the box in the lower right corner). Like this, there is an offset of 2 pixels being drawn, but if I change the

Code: [Select]

(NW-DW/2)-2 in the last line into

Code: [Select]

NW-DW/2 the program will crash.

Am I handling the coordinates wrong? If so, why does it work perfectly fine for the other three boxes?

I'm using SFML2 on Windows 7 64 Bit.

Perde

Oh, the last line from the actual code:

Code: [Select]

ImgBackground.Copy(*DummyBackground, (ImgBackground.GetWidth() - DummyBackground->GetWidth()/2)-2, ImgBackground.GetHeight() - DummyBackground->GetHeight()/2, sf::IntRect(DummyBackground->GetWidth()/2, DummyBackground->GetHeight()/2, DummyBackground->GetWidth()/2, DummyBackground->GetHeight()/2));