/// <summary>
/// Toggles the start side of a polygon.
/// </summary>
public void ToggleStartSide()
{
// Get first view model point
PolygonPointViewModel point1 = PointCollection[0];
// Remove the first view model point
PointCollection.Remove(point1);
// Add the point to the end of the point collection
PointCollection.Add(point1);
// Get the first model point
PolygonPoint pt1 = Polygon.Points[0];
// Remove the first model point
Polygon.Points.Remove(pt1);
// Add the point to the end of the point collection
Polygon.Points.Add(pt1);
// Update the green line segment
Segments[0] = new LineSegmentViewModel(PointCollection[0], PointCollection[1]);
Segments[0].Color = Colors.Lime;
// Tell the view to refresh
NotifyPointCollectionChanged();
}
//Removes that latest input incase of user input error
private void Undo_Button_Click(object sender, RoutedEventArgs e)
{
if (PointListView.SelectedItems != null && PointListView.SelectedItem != null)
{
pointsCollection.Remove((Point)PointListView.SelectedItem);
points.Remove((Point)PointListView.SelectedItem);
}
}
public void UpdateLastPoint(Point point)
{
if (_points.Count > 1)
{
_points.Remove(_points.LastOrDefault());
}
AddPoint(point);
}
/// <summary>
/// Deletes the specified polygon point.
/// </summary>
public void DeletePoint(PolygonPointViewModel pt)
{
// Remove the point from the polygon
PointCollection.Remove(pt);
Polygon.Points.Remove(pt.PolygonPoint);
// Update the green line segment
Segments[0] = new LineSegmentViewModel(PointCollection[0], PointCollection[1]);
Segments[0].Color = Colors.Lime;
// Raise the collection Property changed event so that the converters in the view run
NotifyPointCollectionChanged();
}
/// <summary>
/// Adds the specified point to the point collection.
/// </summary>
/// <param name="position">Position of the new point</param>
public override void AddPoint(Point position)
{
// Create the new model point
PolygonPoint modelPoint = new PolygonPoint();
// Add the model point to the model's point collection
Polygon.Points.Add(modelPoint);
// Create the new view model point
PolygonPointViewModel viewModelPoint = new PolygonPointViewModel(modelPoint, this);
// Initialize the position of the point
viewModelPoint.X = position.X;
viewModelPoint.Y = position.Y;
// Add the point to the view model point collection
PointCollection.Add(viewModelPoint);
// If there are at least two points on the polygon then...
if (PointCollection.Count > 1)
{
// Create a segment between the points
LineSegmentViewModel segment =
new LineSegmentViewModel(
viewModelPoint,
PointCollection[PointCollection.Count - 2]);
// Add the segment
Segments.Add(segment);
}
// If there are two or more points then...
if (PointCollection.Count >= 2)
{
// If the mouse is over the first polygon point then...
if (IsMouseOverFirstPolygonPoint(position))
{
// Remove the last point since we are going to connect up to the first point
PointCollection.Remove(PointCollection[PointCollection.Count - 1]);
Polygon.Points.Remove(Polygon.Points[Polygon.Points.Count - 1]);
// Make the WPF polygon visible
ClosePolygon();
}
}
}
// 对输入的两点及其上点集执行递归算法，找到最远点，根据围成的三角形分类点，生成两条边，对每条边极其上方的点集再次执行本递归算法
private int FindSubHull(PointCollection points, Point pointLeft, Point pointRight)
{
if (points.Count == 0)
{
return(1);
}
int totalCommandCount = 0;
Point pointFarthest = FindFarthestPoint(points, pointLeft, pointRight, out int commandCount);
totalCommandCount += commandCount;
ChangeToVertex(pointFarthest, pointsVertex.IndexOf(pointLeft) + 1);
totalCommandCount += 3;
historyLines.Add(GetLines(pointsVertex, out commandCount));
totalCommandCount += commandCount;
points.Remove(pointFarthest);
totalCommandCount++;
PointCollection points1 = new PointCollection();
PointCollection points2 = new PointCollection();
foreach (Point point in points)
{
int deter1 = CalDeter(pointLeft, pointFarthest, point);
int deter2 = CalDeter(pointFarthest, pointRight, point);
totalCommandCount += 2;
if (deter1 > 0)
{
points1.Add(point);
totalCommandCount++;
}
else if (deter2 > 0)
{
points2.Add(point);
totalCommandCount++;
}
else // 三角形内
{
ChangeToInternal(point);
totalCommandCount += 2;;
}
}
totalCommandCount += FindSubHull(points1, pointLeft, pointFarthest);
totalCommandCount += FindSubHull(points2, pointFarthest, pointRight);
return(totalCommandCount);
}
/// <summary>
/// Toggles the start side of a polygon.
/// </summary>
public void ToggleStartSide()
{
// Get first view model point
PolygonPointViewModel point1 = PointCollection[0];
// Remove the first view model point
PointCollection.Remove(point1);
// Add the point to the end of the point collection
PointCollection.Add(point1);
// Get the first model point
PolygonPoint pt1 = Ellipse.Points[0];
// Remove the first model point
Ellipse.Points.Remove(pt1);
// Add the point to the end of the point collection
Ellipse.Points.Add(pt1);
// Increment the start side
Ellipse.StartSideRotation++;
// If we are past the last side then...
if (Ellipse.StartSideRotation > 3)
{
// Wrap around to the first side
Ellipse.StartSideRotation = 0;
}
// Update the green line segment
Segments[0] = new LineSegmentViewModel(PointCollection[0], PointCollection[1]);
Segments[0].Color = Colors.Lime;
// Force the view converters to run
NotifyPointCollectionChanged();
}
private void PointCollectionOperations(object sender, SelectionChangedEventArgs e)
{
RadioButton li = (sender as RadioButton);
// Strings used to display the results
String syntaxString, resultType, operationString;
// The local variables point1, point2, vector2, etc are defined in each
// case block for readability reasons. Each variable is contained within
// the scope of each case statement.
switch (li.Name)
{ //begin switch
case "rb1":
{
//<SnippetPointCollectionAdd>
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
Point point4 = new Point(40, 40);
// Instantiating an array of Points to the points
Point[] pointArray = new Point[3];
// Adding points to array
pointArray[0] = point1;
pointArray[1] = point2;
pointArray[2] = point3;
// Instantiating a PointCollection and initializing with an array
PointCollection pointCollection1 = new PointCollection(pointArray);
// Adding a point to the PointCollection
pointCollection1.Add(point4);
// pointCollection1 is equal to (10,10 20,20 30,30 40,40)
//</SnippetPointCollectionAdd>
break;
}
case "rb2":
{
//<SnippetPointCollectionClear>
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to the PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// clearing the PointCollection
pointCollection1.Clear();
// pointCollection1 is now empty
//</SnippetPointCollectionClear>
break;
}
case "rb3":
{
//<SnippetPointCollectionContains>
Boolean inCollection;
// Instantiating and Initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
Point point4 = new Point(40, 40);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
inCollection = pointCollection1.Contains(point4);
// inCollection is equal to False
//</SnippetPointCollectionContains>
break;
}
case "rb4":
{
//<SnippetPointCollectionIndexOf>
int pIndex;
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// Getting the index of a Point
pIndex = pointCollection1.IndexOf(point2);
// pointIndex is equal to 1
//</SnippetPointCollectionIndexOf>
break;
}
case "rb5":
{
//<SnippetPointCollectionInsert>
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
Point point4 = new Point(40, 40);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to the PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// Inserting a Point into the PointCollection
pointCollection1.Insert(1, point4);
// pointCollection1 is now equal to (10,10 40,40 20,20 30,30
//</SnippetPointCollectionInsert>
break;
}
case "rb6":
{
//<SnippetPointCollectionRemove>
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// Removing a Point from the PointCollection
pointCollection1.Remove(point2);
// pointCollection1 is equal to 10,10 30,30
//</SnippetPointCollectionRemove>
break;
}
case "rb7":
{
//<SnippetPointCollectionRemoveAt>
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to the PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// Removing a range of Points
pointCollection1.RemoveAt(1);
// pointCollection1 is equal to (10,10 30,30)
//</SnippetPointCollectionRemoveAt>
break;
}
case "rb8":
{
//<SnippetPointCollectionToString>
string pcString;
// Instantiating and initializing Point structures
Point point1 = new Point(10, 10);
Point point2 = new Point(20, 20);
Point point3 = new Point(30, 30);
// Instantiating a PointCollection
PointCollection pointCollection1 = new PointCollection();
// Adding Points to PointCollection
pointCollection1.Add(point1);
pointCollection1.Add(point2);
pointCollection1.Add(point3);
// pointCollection1 is equal to (10,10 20,20 30,30)
// Getting a string representation of the PointCollection
pcString = pointCollection1.ToString();
// pcString is equal to "10,10 20,20 30,30"
//</SnippetPointCollectionToString>
break;
}
case "rb9":
{
break;
}
case "rb10":
{
break;
}
case "rb11":
{
break;
}
case "rb12":
{
break;
}
} //end switch
}
// 设定点为内部点
private void ChangeToInternal(Point point)
{
pointsUnknown.Remove(point);
pointsInternal.Add(point);
}
