Trendlines are an important feature in every charting component. The XamDataChart, the fast chart component capable of real-time data feeds in both WPF and Silverlight platforms, supports a number of built-in trendline types – Linear, Quadratic, Cubic, Quadric, Quintic, Exponential, Logarithmic, among others. Try as we might, we cannot implement every type of trendline possible in the XamDataChart. And all too often…