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I propose to include function PropRescale. [message #24043]

Tue, 22 December 2009 15:06

sergeynikitin
Messages: 748
Registered: January 2008
Location: Moscow, Russia

Contributor

I propose to include in the base package in addition to the functions Rescale function propRescale.

commonfucnc.h:

Image PropRescale(const Image& im, const Size res_size);
Image PropRescale(const Image& im, const int cx, const int cy);
Image PropRescale(const Image& im, const ImageCtrl& imc);
void PropRescale(const Image& im, ImageCtrl& imc ,const bool setimage);

commonfunc.cpp:

Image PropRescale(const Image& im, const Size res_size){
	Size imsize,ressize=res_size;
	imsize = im.GetSize();
	if (imsize.cx > 0 && imsize.cy > 0) {
		double ixy = double(imsize.cx)/imsize.cy;
		double rxy = double(ressize.cx)/ressize.cy;
		if (rxy>ixy) {
			ressize.cx = ressize.cy*imsize.cx/imsize.cy;
		} else {
			ressize.cy = ressize.cx*imsize.cy/imsize.cx;
		}
		return Rescale(im,ressize);
	}
}

Image PropRescale(const Image& im,const int cx,const int cy) {
	Size ressize;
	ressize.cx = cx;
	ressize.cy = cy;
	return PropRescale(im,ressize);
}

Image PropRescale(const Image& im, const ImageCtrl& imc) {
	Image i = PropRescale(im,imc.GetSize());
	return i;
}

void PropRescale(const Image& im, ImageCtrl& imc ,const bool setimage) {
	Image i = PropRescale(im,imc.GetSize());
	if (setimage) imc.SetImage(i);
	return;
}

I use it to display images in ImageCtrl, therefore, as a parameter to some of the call option is ImageCtrl.

The function uses real arithmetic. I was going to transfer all of integer arithmetic, but so far not done so.

Another point. I do not quite understand CacheRescale, so long and did not interface to CacheRescale.

PS.
Perhaps there is a solution makes it unnecessary to my exercises. If so, could you tell. And then I may be wrong, to reinvent the wheel?

SergeyNikitin<U++>( linux, wine )
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under( Ubuntu || Debian || Raspbian );
}

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