public MainWindow()
{
this.MouseMove += this.onMouseMove;
// Create a canvas sized to fill the window
this.canvas = new Canvas();
// Add polygon
this.polygon = new Polygon();
this.polygon.Stroke = Brushes.Black;
this.polygon.Fill = Brushes.Transparent;
this.polygon.StrokeThickness = 1;
// this.polygon.Margin = new Thickness(0, 0, 0, 0.5);
this.polygon.Points = Constants.rectangle;
// this.polygon.MouseMove += this.onMouseMovePolygon;
this.canvas.Children.Add(this.polygon);
// Make sure the polygon is right at the top so the textbox does not overlay it
Canvas.SetZIndex(this.polygon, (int)99);
// Add customPolygon
this.customPolygon = new CustomPolygon(this.polygon);
// Add crosshair
Point centroid = Utilities.getPolygonCentroid(this.polygon);
// this.crossHair = this.addTextBlockToCanvas("X", centroid.X, centroid.Y);
this.crossHair = new Ellipse();
this.crossHair.Width = Constants.crossHairDim;
this.crossHair.Height = Constants.crossHairDim;
this.crossHair.Fill = Brushes.Red;
Canvas.SetLeft(this.crossHair, centroid.X - Constants.crossHairDim / 2);
Canvas.SetTop(this.crossHair, centroid.Y - Constants.crossHairDim / 2);
this.canvas.Children.Add(this.crossHair);
// Populate based on the number of points in the polygon
this.populateObjectiveNames();
this.labelPolygonPoints();
// Add objective names to text elements
this.addObjectiveText();
this.Content = this.canvas;
this.Title = "Shapes Demo";
this.Show();
// mock click in the center of the polygon
}
private void onMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
Point clickPoint = e.GetPosition(this);
Console.WriteLine("the click point is ({0}, {1})", clickPoint.X, clickPoint.Y);
if (!CustomPolygon.IsInPolygon(this.polygon.Points, clickPoint))
{
Point closestPoint = CustomPolygon.ClosestPointFromPointToPolygon(this.customPolygon, clickPoint);
this.displayWeightsFromClick(closestPoint);
}
else
{
this.displayWeightsFromClick(clickPoint);
}
}
}
public static Point ClosestPointFromPointToPolygon(CustomPolygon polygon, Point point)
{
// we keep track of point with minimum distance
Point? minPoint = null;
double minDist = double.MaxValue;
List <CustomLine> polygonLines = polygon.GetPolygonLines();
// for each line in polygon, find the perpendicular line from point
for (int i = 0; i < polygonLines.Count(); i++)
{
CustomLine lineSegment = polygonLines[i];
double slope = lineSegment.getSlope();
double perpSlope = CustomLine.getPerpendicularSlope(slope);
CustomLine perpLine = new CustomLine(point, perpSlope);
Point? intersectionPoint = CustomLine.getIntersectionCoordinates(lineSegment, perpLine);
if (intersectionPoint.HasValue)
{
double dist = Utilities.getDistance(intersectionPoint.Value, point);
// does this line intersect the polygon line segment?
// is the intersection point and the point a min distance
if (CustomLine.withinLineSegment(intersectionPoint.Value, lineSegment) &&
dist < minDist)
{
minDist = dist;
minPoint = intersectionPoint;
}
}
else
{
throw new Exception("Intersection Point is null even though it should have a coordinate");
}
}
// If there is a minpoint we are good to go
if (minPoint.HasValue)
{
return(minPoint.Value);
}
// or else we calculate the closest distance from the point to the polygon corners
else
{
minDist = double.MaxValue;
PointCollection points = polygon.GetPoints();
for (int i = 0; i < points.Count; i++)
{
double dist = Utilities.getDistance(points[i], point);
if (dist < minDist)
{
minDist = dist;
minPoint = points[i];
}
}
}
// If there is a minpoint we are good to go
if (minPoint.HasValue)
{
return(minPoint.Value);
}
else
{
throw new Exception("Point with minimum distance is null even though it should have a coordinate");
}
}