public static double distFromPointToLine(Point x, System.Windows.Point startPoint, System.Windows.Point finishPoint)
{
Point a = new Point(startPoint.X, startPoint.Y);
Point b = new Point(finishPoint.X, finishPoint.Y);
double ret = distFromPointToPoint(x, a);
double eps = 1e-4;
double l = 0;
double r = distFromPointToPoint(a, b);
Point directionVector = new Point((b.X - a.X) / r, (b.Y - a.Y) / r);
while (Math.Abs(r - l) > eps)
{
double m1 = l + (r - l) / 3;
double m2 = r - (r - l) / 3;
Point pointAtM1 = new Point(a.X + directionVector.X * m1, a.Y + directionVector.Y * m1);
Point pointAtM2 = new Point(a.X + directionVector.X * m2, a.Y + directionVector.Y * m2);
if (distFromPointToPoint(x, pointAtM1) < distFromPointToPoint(x, pointAtM2))
{
ret = Math.Min(ret, distFromPointToPoint(x, pointAtM1));
r = m2;
}
else
{
ret = Math.Min(ret, distFromPointToPoint(x, pointAtM2));
l = m1;
}
}
return(ret);
}
/// <summary>
/// Event handler for mouse click on canvas.
/// </summary>
/// <param name="sender">The <see cref="Canvas"/> that the action is for</param>
/// <param name="e">Arguments that the implementor of this event may find useful.</param>
private void MyPoly_MouseDown(object sender, MouseButtonEventArgs e)
{
if (currentChosenBrokenLineId > -1 && currentMode == Mode.Moving)
{
for (var i = DrawingPanel.Children.Count - 1; i >= 0; i--)
{
selectedPolyline = DrawingPanel.Children[i] as Shape;
clickV = e.GetPosition(selectedPolyline);
if (Util.PointIsInBrokenLine(new Point(clickV.X, clickV.Y), selectedPolyline as Polyline))
{
currentChosenBrokenLineId = i;
dragging = true;
return;
}
}
}
}
/// <summary>
/// Function to move BrokenLine on canvas using arrow keys.
/// </summary>
/// <param name="sender">The <see cref="Canvas"/> that the action is for</param>
/// <param name="e">Arguments that the implementor of this event may find useful.</param>
private void MoveBrokenLineWithKeys(object sender, KeyEventArgs e)
{
try
{
if (Keyboard.IsKeyDown(Key.Escape))
{
ClearExpectedBrokenLine();
}
else
{
if (currentMode == Mode.Moving && currentChosenBrokenLineId > -1 && DrawingPanel.Children.Count > 0)
{
var newLoc = new System.Windows.Point(0, 0);
if (Keyboard.IsKeyDown(Key.Up) && Keyboard.IsKeyDown(Key.Right))
{
newLoc.Y -= 5;
newLoc.X += 5;
}
else if (Keyboard.IsKeyDown(Key.Up) && Keyboard.IsKeyDown(Key.Left))
{
newLoc.Y -= 5;
newLoc.X -= 5;
}
else if (Keyboard.IsKeyDown(Key.Down) && Keyboard.IsKeyDown(Key.Right))
{
newLoc.Y += 5;
newLoc.X += 5;
}
else if (Keyboard.IsKeyDown(Key.Down) && Keyboard.IsKeyDown(Key.Left))
{
newLoc.Y += 5;
newLoc.X -= 5;
}
else if (Keyboard.IsKeyDown(Key.Up))
{
newLoc.Y -= 5;
}
else if (Keyboard.IsKeyDown(Key.Right))
{
newLoc.X += 5;
}
else if (Keyboard.IsKeyDown(Key.Down))
{
newLoc.Y += 5;
}
else if (Keyboard.IsKeyDown(Key.Left))
{
newLoc.X -= 5;
}
if (!((DrawingPanel.Children[currentChosenBrokenLineId] as Shape) is Polyline p))
{
throw new InvalidDataException("can't move null shape");
}
Canvas.SetLeft(p, Canvas.GetLeft(p) + newLoc.X);
Canvas.SetTop(p, Canvas.GetTop(p) + newLoc.Y);
}
}
}
catch (Exception exc)
{
FormBl.MessageBoxFatal(exc.ToString());
}
}
public void TestOnSegment(System.Windows.Point p, System.Windows.Point q, System.Windows.Point r)
{
Assert.True(Util.OnSegment(p, q, r));
}