public ScreenPositionData GetClosestScreenPosition(Point screenPosition, double positionSelectionMinDistance)
{
if (ShownScreenPositions == null)
{
return(null);
}
ScreenPositionData closestScreenPositionData = null;
double closestDistance = double.MaxValue;
for (int i = 0; i < ShownScreenPositions.Count; i++)
{
var rectangleDistance = (screenPosition - ShownScreenPositions[i].ScreenCenterPosition).Length;
if (rectangleDistance < closestDistance)
{
closestDistance = rectangleDistance;
closestScreenPositionData = ShownScreenPositions[i];
}
}
if (closestDistance <= positionSelectionMinDistance) // Do we have a position that is within accepted distance from the specified screenPosition?
{
return(closestScreenPositionData);
}
return(null);
}
// Updates shown screen positions on a 2D Canvas - called after camera or size change
public void UpdateScreenPosition(ScreenPositionData screenPositionData)
{
if (screenPositionData == null || this.Camera == null)
{
return;
}
var position3D = screenPositionData.WorldPosition;
var screenPosition = this.Camera.Point3DTo2D(position3D);
screenPositionData.ScreenCenterPosition = screenPosition;
var rectangle = screenPositionData.PositionRectangle;
if (rectangle != null)
{
Canvas.SetLeft(rectangle, screenPosition.X - rectangle.Width * 0.5);
Canvas.SetTop(rectangle, screenPosition.Y - rectangle.Height * 0.5);
}
rectangle = screenPositionData.SelectionRectangle;
if (rectangle != null)
{
Canvas.SetLeft(rectangle, screenPosition.X - rectangle.Width * 0.5);
Canvas.SetTop(rectangle, screenPosition.Y - rectangle.Height * 0.5);
}
}
public void SelectScreenPosition(ScreenPositionData screenPositionData)
{
if (screenPositionData == null || screenPositionData.IsSelected)
{
return;
}
var rectangle = CreateSelectionRectangle(screenPositionData.ScreenCenterPosition, SceneEditorContext.Current.SelectedBrush);
this.Children.Add(rectangle);
screenPositionData.IsSelected = true;
screenPositionData.SelectionRectangle = rectangle;
}
public void ClearSelectedScreenPosition(ScreenPositionData screenPositionData)
{
if (screenPositionData == null || !screenPositionData.IsSelected)
{
return;
}
if (!screenPositionData.IsHighlighted && screenPositionData.SelectionRectangle != null) // Preserve the rectangle if this position is also highlighted
{
this.Children.Remove(screenPositionData.SelectionRectangle);
screenPositionData.SelectionRectangle = null;
}
screenPositionData.IsSelected = false;
}