public bool IsUnderCursor(Point point)
{
var cursor = new Stick
{
Start = new Point(point.X - StickWidth, point.Y - StickWidth),
End = new Point(point.X + StickWidth, point.Y + StickWidth)
};
return(Intersects(cursor));
}
public static List <Stick> CreateSticks(Point edge, int count)
{
var sticks = new List <Stick>();
var r = new Random();
var allQuadrants = new List <Point> {
new Point(0, 1), new Point(1, 1), new Point(1, 0), new Point(0, 0)
};
var halfX = edge.X / 2;
var halfY = edge.Y / 2;
while (sticks.Count < count)
{
var stick = new Stick
{
Start = new Point(r.Next(edge.X), r.Next(edge.Y)),
Pen = allPens[r.Next(allPens.Length)],
Order = sticks.Count
};
// ensure end is in another quadrant so that a minimum size line is possible.
var quadrants = new List <Point>(allQuadrants);
var qIndex = 3;
if (stick.Start.X > halfX && stick.Start.Y > halfY)
{
qIndex = 1;
}
else if (stick.Start.X < halfX && stick.Start.Y > halfY)
{
qIndex = 0;
}
else if (stick.Start.X > halfX && stick.Start.Y < halfY)
{
qIndex = 2;
}
quadrants.RemoveAt(qIndex);
var q = quadrants[r.Next(quadrants.Count)];
stick.End = new Point(q.X * halfX + r.Next(halfX), q.Y * halfY + r.Next(halfY));
stick.Above = sticks.Where(x => stick.Intersects(x)).ToArray();
sticks.Insert(0, stick);
}
return(sticks);
}
private bool Intersects(Stick s)
{
Point p1 = s.Start, q1 = s.End, p2 = Start, q2 = End;
int o1 = Orientation(p1, q1, p2);
int o2 = Orientation(p1, q1, q2);
int o3 = Orientation(p2, q2, p1);
int o4 = Orientation(p2, q2, q1);
// General case
if (o1 != o2 && o3 != o4)
{
return(true);
}
// Special Cases
// p1, q1 and p2 are colinear and p2 lies on segment p1q1
if (o1 == 0 && OnSegment(p1, p2, q1))
{
return(true);
}
// p1, q1 and p2 are colinear and q2 lies on segment p1q1
if (o2 == 0 && OnSegment(p1, q2, q1))
{
return(true);
}
// p2, q2 and p1 are colinear and p1 lies on segment p2q2
if (o3 == 0 && OnSegment(p2, p1, q2))
{
return(true);
}
// p2, q2 and q1 are colinear and q1 lies on segment p2q2
if (o4 == 0 && OnSegment(p2, q1, q2))
{
return(true);
}
return(false); // dont bother checking if collinear
}
private void btnShuffle_Click(object sender, EventArgs e)
{
sticks = Stick.CreateSticks(new Point(pnlSticks.Width, pnlSticks.Height), int.Parse(txtCount.Text));
pnlSticks.Invalidate();
}
