/// <summary>
/// Creates a polygon line segment.
/// </summary>
/// <param name="polygon">Polygon to create the line segment for</param>
/// <param name="previousPoint">Previous polygon point</param>
/// <param name="nextPoint">Next polygon point</param>
private void CreatePolygonLineSegment(PolygonViewModel polygon, PolygonPointViewModel previousPoint, PolygonPointViewModel nextPoint)
{
PolygonLineSegment segment = new PolygonLineSegment();
segment.Line.Visibility = Visibility.Visible;
segment.Line.Opacity = 0.0;
segment.Line.StrokeThickness = 4;
segment.Line.Stroke = Brushes.DodgerBlue;
segment.Line.X1 = previousPoint.X;
segment.Line.Y1 = previousPoint.Y;
segment.Line.X2 = nextPoint.X;
segment.Line.Y2 = nextPoint.Y;
segment.StartPoint = previousPoint;
segment.EndPoint = nextPoint;
canvas.Children.Add(segment.Line);
polygon.LineSegments.Add(segment);
}
/// <summary>
/// Returns true if the mouse is over a polygon line.
/// </summary>
/// <param name="mousePosition">Mouse position</param>
/// <param name="polygonLineSegment">Polygon line segment the mouse is over</param>
/// <param name="polygonParent">Polygon the line segment belongs to</param>
/// <returns></returns>
private bool IsMouseOverLine(Point mousePosition,
// ReSharper disable once RedundantAssignment
ref PolygonLineSegment polygonLineSegment,
// ReSharper disable once RedundantAssignment
ref PolygonViewModel polygonParent)
{
// Default to NOT being over a polygon line
bool mouseOverLine = false;
polygonLineSegment = null;
polygonParent = null;
// No need to do this processing if the editor is not in
// add polygon point mode
if (VM.AddPoint)
{
// Update all the polygon lines to make sure they are accurate
UpdatePolygonLines();
// Loop over all the polygons
foreach (PolygonViewModel polygon in VM.Polygons)
{
// Loop over all the line segments
foreach (PolygonLineSegment segment in polygon.LineSegments)
{
// If the mouse is over a line then...
if (segment.Line.IsMouseOver)
{
// Return the line segment
polygonLineSegment = segment;
// Return the polygon which contains the line segment
polygonParent = polygon;
// Indicate that the mouse is over a polygon line segment
mouseOverLine = true;
}
}
}
}
// Return whether the mouse is over a polygon line segment
return(mouseOverLine);
}
