補色をとる

COLORREF CPhotoDialog::GetComplementColor(COLORREF rgb)
   {
	int r,b,g;
	r=GetRValue(rgb);
	g=GetGValue(rgb);
	b=GetBValue(rgb);
	int range=60;
	int minRange=128-range;
	int maxRange=128+range;
	if((minRange<r && r<maxRange)
	&& (minRange<g && g<maxRange)
	&& (minRange<b && b<maxRange))
	{
		if( r<128 && g<128 && b<128)
			rgb=0xffffff;
		else
			rgb=0x0;
	}
	else
		rgb=0xffffff^rgb;
	return rgb;
   }

COLORREF CPhotoDialog::Average(int x, int y)
   {
	double ratio=(double)m_pImage->GetWidth()/m_displaySize.cx;
	x=(int)(x*ratio);
	y=(int)(y*ratio);
	
	COLORREF rgb;
	long r=0,g=0,b=0;
	for(int i=x-CORNERSIZE;i<x+CORNERSIZE;i++)
		for(int j=y-CORNERSIZE;j<y+CORNERSIZE;j++)
		{	
			if(i<0 || j<0 || m_pImage->GetWidth()<=i || m_pImage->GetHeight()<=j)
				rgb=m_pImage->GetPixel(x,y);
			else
				rgb=m_pImage->GetPixel(i,j);
			b+=GetBValue(rgb);
			g+=GetGValue(rgb);
			r+=GetRValue(rgb);
		}
	int nPixels=4*CORNERSIZE*CORNERSIZE;
	r=(long)((double)r/nPixels);
	g=(long)((double)g/nPixels);
	b=(long)((double)b/nPixels);
	return RGB(r,g,b);
   }