Removed saturation of y-value to visible range.
Removed saturation of y-value to visible range.

Before this patch, the chart could convey misinformation under some circumstances. For example, if you set maxValue to 5, and then plotted the values 1,10,1, you would view these points as 1,5,1. By saturating the y-pixel-value to always be on the chart, the viewer may be shown misinformation.

 This patch simply removes the saturation. If the min/max values are tighter than the data, you see cropping of the series.

mcanthony/smoothie,stanlry/smoothie,stanlry/smoothie,junlapong/smoothie,mahnunchik/smoothie,junlapong/smoothie,mcanthony/smoothie