public void RotateLocal(float angle)
{
if (Lines.Count != 0)
{
for (int i = 0; i < Lines.Count; i++)
{
Lines[i].startPoint = LinePrimatives.RotatePoint(Vector2.Zero, angle, Lines[i].startPoint);
Lines[i].endPoint = LinePrimatives.RotatePoint(Vector2.Zero, angle, Lines[i].endPoint);
}
}
}
public static void DrawRectangle(SpriteBatch spriteBatch, float width, Color color, Rectangle Rec, float Roation, Vector2 Center)
{
LineDrawer.DrawLine(spriteBatch, width, color, RotatePoint(Center, Roation, new Vector2((Rec.X), (Rec.Y))), LinePrimatives.RotatePoint(Center, Roation, new Vector2((Rec.X + Rec.Width), (Rec.Y))));
LineDrawer.DrawLine(spriteBatch, width, color, RotatePoint(Center, Roation, new Vector2((Rec.X + Rec.Width), Rec.Y)), LinePrimatives.RotatePoint(Center, Roation, new Vector2((Rec.X + Rec.Width), (Rec.Y + Rec.Height))));
LineDrawer.DrawLine(spriteBatch, width, color, RotatePoint(Center, Roation, new Vector2((Rec.X + Rec.Width), (Rec.Y + Rec.Height))), LinePrimatives.RotatePoint(Center, Roation, new Vector2((Rec.X), (Rec.Y + Rec.Height))));
LineDrawer.DrawLine(spriteBatch, width, color, RotatePoint(Center, Roation, new Vector2((Rec.X), (Rec.Y + Rec.Height))), LinePrimatives.RotatePoint(Center, Roation, new Vector2((Rec.X), (Rec.Y))));
}
public void Draw(SpriteBatch spriteBatch, Vector2 Offset, float Rotation, Vector2 Scale)
{
// TO DO: Add in code for Rotation around a Point that is not the Origin
LineDrawer.DrawLine(spriteBatch, width, color, LinePrimatives.RotatePoint(Vector2.Zero, Rotation, startPoint * Scale) + Offset, LinePrimatives.RotatePoint(Vector2.Zero, Rotation, endPoint * Scale) + Offset);
}
public Vector2?Intersect(Ellipse other)
{
// If the ellipse or line segment are empty, (that is smaller than the percision) forget the work and return no intersections.
if ((this.Length() <= PERCISION) && (other.Axis.X <= PERCISION) && (other.Axis.Y <= PERCISION))
{
return(null);
}
// Make sure the axis has non-negative width and height.
if (other.Axis.X < 0)
{
other.Axis.X = -other.Axis.X;
}
if (other.Axis.Y < 0)
{
other.Axis.Y = -other.Axis.Y;
}
// Need to translate the start and end points of the line
// the need
Vector2 tstartPoint = startPoint - other.Position;
Vector2 tendPoint = endPoint - other.Position;
float Offsetroation = -other.Roation;
if (other.Roation != 0)
{
tstartPoint = LinePrimatives.RotatePoint(Vector2.Zero, Offsetroation, tstartPoint);
tendPoint = LinePrimatives.RotatePoint(Vector2.Zero, Offsetroation, tendPoint);
}
Vector2 AxisLocation = Vector2.Zero;
AxisLocation.X = other.Axis.X;
AxisLocation.Y = other.Axis.Y;
if (AxisLocation.X < 0)
{
AxisLocation.X = -AxisLocation.X;
}
if (AxisLocation.Y < 0)
{
AxisLocation.Y = -AxisLocation.Y;
}
// Calculate the quadratic parameters.
float A = (tendPoint.X - tstartPoint.X) * (tendPoint.X - tstartPoint.X) / AxisLocation.X / AxisLocation.X +
(tendPoint.Y - tstartPoint.Y) * (tendPoint.Y - tstartPoint.Y) / AxisLocation.Y / AxisLocation.Y;
float B = 2 * tstartPoint.X * (tendPoint.X - tstartPoint.X) / AxisLocation.X / AxisLocation.X +
2 * tstartPoint.Y * (tendPoint.Y - tstartPoint.Y) / AxisLocation.Y / AxisLocation.Y;
float C = tstartPoint.X * tstartPoint.X / AxisLocation.X / AxisLocation.X + tstartPoint.Y * tstartPoint.Y / AxisLocation.Y / AxisLocation.Y - 1;
// Make a list of t values.
List <float> t_values = new List <float>();
// Calculate the discriminant.
float discriminant = B * B - 4 * A * C;
if (discriminant == 0)
{
// One real solution.
t_values.Add(-B / 2 / A);
}
else if (discriminant > 0)
{
// Two real solutions.
t_values.Add((float)((-B + Math.Sqrt(discriminant)) / 2 / A));
t_values.Add((float)((-B - Math.Sqrt(discriminant)) / 2 / A));
}
//Console.WriteLine(t_values.Count);
// Convert the t values into points.
List <Vector2?> points = new List <Vector2?>();
foreach (float t in t_values)
{
// If the points are on the segment add them to the list.
if (((t >= 0f) && (t <= 1f)))
{
float x = tstartPoint.X + (tendPoint.X - tstartPoint.X) * t;
float y = tstartPoint.Y + (tendPoint.Y - tstartPoint.Y) * t;
Vector2 tVec = new Vector2(x, y);
if (other.Roation != 0)
{
tVec = LinePrimatives.RotatePoint(Vector2.Zero, -Offsetroation, tVec);
}
tVec += other.Position;
points.Add(tVec);
}
}
// Return the closest point to the line start point if an intersection exists
if (points.Count == 0)
{
return(null);
}
if (points.Count == 1)
{
return(points[0]);
}
if (Vector2.Distance(startPoint, points[0].Value) <= Vector2.Distance(startPoint, points[1].Value))
{
return(points[0]);
}
else
{
return(points[1]);
}
}