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1. png files and toolbar

#4742

Posted by: 2004-07-07 15:47:37

Hi,

i would like to create a toolbar and use png files instead of bitmaps.

I create the GUI with wxGlade and i can compile the code.
But the png files are not included in the .exe and therefore i see this prompt:
"Can't load image from file...."

What can i do?
Can i create xpm files with transparent background?

Thanks a lot...

2. Re: png files and toolbar

#4744

Posted by: upCASE 2004-07-07 16:12:47

Hi!
Yes, XPM files can have a transparent background. In fact XPM files are just plain text files that define a static char* array with the image data. Open it with your favorite texteditor and change the "sign" that corresponds to the transparent colour to "none".

Example (up.xpm from wxWidgets itself):
static char * up_xpm[] = {
"16 16 5 1",
"    c None",
".    c #000000",
"+    c #C0E4CB",
"@    c #808080",
"#    c #77C490",
"                ",
"       .        ",
"      .+.@      ",
"     .+++.@     ",
"    .++##+.@    ",
"   .++####+.@   ",
" ....+##....@ ",
"     .+##.@@@@@ ",
"     .+##.@     ",
"     .+##.@     ",
"     .+##.@     ",
"     .+##.@     ",
"     .+##.@     ",
"     .....@     ",
"                ",
"                "};

All spaces will be transparent.

upCASE
-----------------------------------
If it was hard to write, it should be hard to read!- Do. Or do not. There is no try!

3. Re: png files and toolbar

#4745

Posted by: upCASE 2004-07-07 16:16:27

Hi!
I forgot: I think with PNG it should work if you load them as a wxImage in use wxImage::ConvertToBitmap() on them. Be sure to init the PNG handler first.

upCASE
-----------------------------------
If it was hard to write, it should be hard to read!- Do. Or do not. There is no try!

4. Re: png files and toolbar

#4748

Posted by: 2004-07-07 20:25:02

Hi...

first of all..thanks...

If learned much about the xpm file format...but when i try to use a xpm file
with MSW, i got the the message
"undefined symbol 'cut_xpm'..."

I have included the file with this lines in the header...


 #define USE_XPM_BITMAPS 1
 #define wxUSE_XPM_IN_MSW 1

 #if USE_XPM_BITMAPS && defined(__WXMSW__) && !wxUSE_XPM_IN_MSW
    #error You need to enable XPM support to use XPM bitmaps with toolbar!
 #endif // USE_XPM_BITMAPS

 #include "icons/cut.xpm"

and within the cpp file


 wxBitmap * toolBarBitmaps[1];
 toolBarBitmaps[0] = new wxBitmap( cut_xpm );

I hope this is enough example code...

I would prefer the solution with the xpm files....but if this not work:
How can i include the png file?
Is the png file compiled into the executable, if i load it with wxImage?

Thanks...
funlovin

5. Re: png files and toolbar

#4754

Posted by: upCASE 2004-07-08 02:12:53

Hi!
Open cut.xpm and see if the array is really named cut_xpm. I saw that once with some editor who append something to it (like cut_xpm_???).

"How can i include the png file?
Is the png file compiled into the executable, if i load it with wxImage?"
You can only load the PNG file. Technically it's possible to include the file as a windows resource in the rc file. It is possible to load this custom resource from wxWidgets using ::wxLoadUserResource() (only on Windows, thus breaking protability), but the problem is how to construct an image from the data you get. I tried some ways, but none worked...

For portability use the XPM solution. It's available on all platforms, so this is the way to go...

upCASE
-----------------------------------
If it was hard to write, it should be hard to read!- Do. Or do not. There is no try!

6. Re: png files and toolbar

#4766

Posted by: 2004-07-08 18:28:42

Thanks again...

Thats it...now the XPM solution works fine....

Greetings..

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