public static List<Point> OptimizeForIndexedChart(this IEnumerable<Point> points, Chart chart)
{
var isFirst = true;
var result = new List<Point>();
var ppp = chart.PerformanceConfiguration.PixelsPerPoint;
double? x = null;
var g = new List<Point>();
foreach (var point in points)
{
var chartValue = chart.ToPlotArea(point.X,AxisTags.X);
if (x == null) x = chartValue;
if (chartValue - x < ppp)
{
g.Add(point);
continue;
}
//ToDo: Think about this:
//average seems the best "general" method, but maybe a developer
//should be able to choose the method.
var xx = g.Average(p => p.X);
if (isFirst)
{
xx = g.First().X;
isFirst = false;
}
result.Add(new Point(xx, g.Average(p => p.Y)));
g = new List<Point> {point};
x = chart.ToPlotArea(point.X, AxisTags.X);
}
result.Add(new Point(g.Last().X, g.Average(p => p.Y)));
return result;
}
private void Chart_OnPlot(Chart chart)
{
var sunPoint = chart.ToPlotArea(new Point(4, 35));
var snowPoint = chart.ToPlotArea(new Point(8, -3));
var notePoint = chart.ToPlotArea(new Point(1, 35));
Canvas.SetLeft(_sun, sunPoint.X - 20);
Canvas.SetLeft(_snow, snowPoint.X - 20);
Canvas.SetLeft(_note, notePoint.X);
Canvas.SetTop(_sun, sunPoint.Y - 20);
Canvas.SetTop(_snow, snowPoint.Y - 20);
Canvas.SetTop(_note, notePoint.Y);
}
