private void StartMarkerAnimation(ToggleButton milestoneButton)
{
markerState = MarkerStates.Animating;
markerAnimationStartTime = DateTime.Now;
markerAnimationStartX = marker.Margin.Left;
Rect milestoneButtonRect = GetBoundingBox(milestoneButton, uniformGrid);
markerAnimationEndX = milestoneButtonRect.Left + milestoneButtonRect.Width * 0.5 + uniformGrid.Margin.Left;
marker.Visibility = Visibility.Visible;
}
//this gets called once per frame
void CompositionTarget_Rendering(object sender, EventArgs e)
{
if (!initialisedMarker && milestoneButtons != null)
{
if (milestoneButtons.Length > 0)
{
Rect milestoneButtonRect = GetBoundingBox(milestoneButtons[0], uniformGrid);
double x = milestoneButtonRect.Left + milestoneButtonRect.Width * 0.5 + uniformGrid.Margin.Left;
marker.Margin = new Thickness(x, marker.Margin.Top, marker.Margin.Right, marker.Margin.Bottom);
}
initialisedMarker = true;
}
if (markerState == MarkerStates.Animating)
{
DateTime now = DateTime.Now;
TimeSpan elapsed = now - markerAnimationStartTime;
double t = elapsed.TotalMilliseconds / (WpfApplication1.Properties.Settings.Default.MissionTimelineMarkerAnimateSeconds * 1000.0);
if (t > 1.0)
{
t = 1.0;
markerState = MarkerStates.Stopped;
}
//apply easing
t = 1.0f - t;
t = t * t * t;
t = 1.0f - t;
double x = (1.0f - t) * markerAnimationStartX + t * markerAnimationEndX;
marker.Margin = new Thickness(x, marker.Margin.Top, marker.Margin.Right, marker.Margin.Bottom);
}
}
