void CircularGaugeControl_MouseMove(object sender, MouseEventArgs e) {
CircularGaugeControl gauge = (CircularGaugeControl)sender;
ArcScaleNeedle currentSelectedNeedle = selectedNeedle != null ? selectedNeedle : gauge.CalcHitInfo(e.GetPosition(gauge)).Needle;
if(currentSelectedNeedle != null)
ShowTooltip(currentSelectedNeedle, this, e.GetPosition(this));
else
HideTooltip();
}
void CircularGaugeControl_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
CircularGaugeControl gauge = sender as CircularGaugeControl;
if(gauge != null) {
CircularGaugeHitInfo hitInfo = gauge.CalcHitInfo(e.GetPosition(gauge));
if(hitInfo.InNeedle)
selectedNeedle = hitInfo.Needle;
}
}
void ShowTooltip(ArcScaleNeedle needle, UIElement placementTarget, Point position) {
ttContent.Text = string.Format("Value = {0:F2}", needle.Value);
needleTooltip.Placement = PlacementMode.RelativePoint;
needleTooltip.PlacementTarget = placementTarget;
needleTooltip.HorizontalOffset = position.X + toolTipOffset;
needleTooltip.VerticalOffset = position.Y + toolTipOffset;
needleTooltip.IsOpen = true;
Cursor = Cursors.Hand;
}
void CircularGaugeControl_MouseLeave(object sender, MouseEventArgs e)
{
selectedNeedle = null;
HideTooltip();
}
void CircularGaugeControl_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
selectedNeedle = null;
HideTooltip();
}
