Gradient fill

Carrying out a gradient fill is something very simple to do. The following code carries this out (whether you require a palette or not).

Aside from this function, you need to either have a CRect attribute in the class (m_rcClient), or set the width and height of the fill in the function itself. Also, a bool which indicates whether we need to use a palette or not.

This example carries out a blue gradient fill. If you want to use other colours, then you can do so easily for Red and Green (place the calculation in the Red or Green component of the RGB call!).

It really depends how sophisticated you want to get, you typically need to balance flexibility with speed when it comes to drawing.
void CImageWnd::DoGradientFill(CDC *pDC) const
{
	int nWidth = m_rcClient.Width(); 
	int nHeight = m_rcClient.Height();
	CRect rectangle;

	if(m_bUsePalette)
	{
		for(int i = 0; i < nHeight; ++i) // Fill in strip
		{
			rectangle.SetRect(0, i, nWidth, i + 1);
			
			CBrush brush;
			brush.CreateSolidBrush(RGB(0, 0, 255 - MulDiv(i,>252, nHeight)));
			pDC->FillRect(&rectangle, &brush);
		}
	}
	else
	{
		for(int i = 0; i < nHeight; ++i) // Fill in strip
		{
			rectangle.SetRect(0, i, nWidth, i + 1);
			pDC->FillSolidRect(&rectangle, RGB(0, 0, 255 ->MulDiv(i, 252, nHeight)));
		}
	}
}




Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: April 21, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT For mid-sized companies, the challenge of serving people and providing better service is forcing a re-evaluation of their contact centers to improve customer experiences. While these growing enterprises are driving much of the market's innovation, they must remain nimble in how they operate, and be very responsive to customer needs. This upcoming eSeminar reveals five ways mid-size organizations can gain needed agility and examines how delivering …

  • Data integrity and ultra-high performance dictate the success and growth of many companies. One of these companies is BridgePay Network Solutions, a recently launched and rapidly growing financial services organization that allows merchants around the world to process millions of daily credit card transactions. Due to the nature of their business, their IT team needed to strike the perfect balance between meeting regulatory-mandated data security measures with the lowest possible levels of latency and …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date