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Re: image drawn in Paint(Draw &w) does not stay when refereshed [message #12943 is a reply to message #12937]

Fri, 30 November 2007 00:28

amit
Messages: 17
Registered: November 2007

Promising Member

mrjt wrote on Thu, 29 November 2007 18:46

I can't get that code to compile in GCC, but my best guess is that logo is an ImageBuffer - When DrawImage is called it converted to an Image and this clears the ImageBuffer so that next Refresh it is empty.

Try changing logo to an Image and doing:

ImageBuffer ib(150,30);
RGBA *pixel = ~ib;
...
logo = ib;

James

thats exactly what it was ... it perfectly solved the problem .... thanks a lot, the change made were exact ... but why does it clears the ImageBuffer in DrawImage()?? let me guess , it is a trade off for performance and stuff?? that works perfectly fine with me (off course it would be fine ... there is another 'clean' method of doing my requirement )

thanks a lot ... i was using ImageCtrl as a solution but there were some side effect as ImageCtrl is a control itself and hence did not behave like the rest of surface client on mouse functions.

the final code is:

Image logo; // changed form ImageBuffer logo; (in the .h main class)

 ----------------------

////////////< ------------------------------------------------------------ ------------------------------------------------------------ --------------------------logo stuff start
ImageBuffer ib = ImageBuffer(150,30); // changed
RGBA *pixel = ~ib; // or (... = ib ) //changed
byte *raw_image_data = (byte *)logo_hex_data;
for(int i=0; i<150*30; i++)
{
pixel->a = 255;
pixel->r = *raw_image_data++;
pixel->g = *raw_image_data++;
pixel->b = *raw_image_data++;
pixel++;
}
ib.SetKind(IMAGE_OPAQUE); // changed

logo = ib; // changed

////////////< ------------------------------------------------------------ ------------------------------------------------------------ ----------------------------------------logo stuff end

one more help ... just wanted to know the exact reason why DrawImage() clears ImageBuffer

[Updated on: Fri, 30 November 2007 07:27]

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