public override void OnModifierMouseMove(ModifierMouseArgs e)
{
base.OnModifierMouseMove(e);
var allSeries = this.ParentSurface.RenderableSeries;
// Translates the mouse point to chart area, e.g. when you have left axis
var pt = GetPointRelativeTo(e.MousePoint, this.ModifierSurface);
// Position the rollover line
_line.Y1 = 0;
_line.Y2 = ModifierSurface.ActualHeight;
_line.X1 = pt.X;
_line.X2 = pt.X;
ClearModifierSurface();
// Add the rollover line to the ModifierSurface, which is just a canvas over the main chart area, on top of series
this.ModifierSurface.Children.Add(_line);
// Add the rollover points to the surface
var hitTestResults = allSeries.Select(x => x.VerticalSliceHitTest(pt)).ToArray();
foreach (var hitTestResult in hitTestResults)
{
const int markerSize = 7;
// Create one ellipse per HitTestResult and position on the canvas
var ellipse = new Ellipse()
{
Width = markerSize,
Height = markerSize,
Fill = _line.Stroke,
IsHitTestVisible = false,
Tag = typeof(SimpleRolloverModifier)
};
//ToolTip =
Canvas.SetLeft(ellipse, hitTestResult.HitTestPoint.X - markerSize * 0.5);
Canvas.SetTop(ellipse, hitTestResult.HitTestPoint.Y - markerSize * 0.5);
this.ModifierSurface.Children.Add(ellipse);
// Create one label per HitTestResult and position on the canvas
// TODO: Could this be templated? Yes it could!
var text = new Border()
{
IsHitTestVisible = false,
BorderBrush = TextForeground,
BorderThickness = new Thickness(1),
Background = LineBrush,
CornerRadius = new CornerRadius(2, 2, 2, 2),
Tag = typeof(SimpleRolloverModifier),
Child = new TextBlock()
{
Text = string.Format("X: {0}, Y: {1}", XAxis.FormatCursorText(hitTestResult.XValue), YAxis.FormatCursorText(hitTestResult.YValue)),
FontSize = 11,
Margin = new Thickness(3),
Foreground = TextForeground,
}
};
Canvas.SetLeft(text, hitTestResult.HitTestPoint.X + 5);
Canvas.SetTop(text, hitTestResult.HitTestPoint.Y - 5);
this.ModifierSurface.Children.Add(text);
}
}
