public static bool Animate( Point currentValue, Vector currentVelocity, Vector force, double dampening, double terminalVelocity, double minValueDelta, double minVelocityDelta, out Point newValue, out Vector newVelocity) { Debug.Assert(currentValue.IsRational()); Debug.Assert(currentVelocity.IsRational()); Debug.Assert(dampening.IsRational()); Debug.Assert(dampening > 0 && dampening < 1); Debug.Assert(terminalVelocity > 0); Debug.Assert(minValueDelta > 0); Debug.Assert(minVelocityDelta > 0); if (force.Length > minValueDelta || currentVelocity.Length > minVelocityDelta) { newVelocity = currentVelocity * (1 - dampening); newVelocity += force; newVelocity *= (currentVelocity.Length > terminalVelocity) ? terminalVelocity / currentVelocity.Length : 1; newValue = currentValue + newVelocity; return true; } else { newValue = currentValue; newVelocity = new Vector(); return false; } }
public Line(Point p1, Point p2) { Util.RequireArgument(p1.IsRational(), "p1"); Util.RequireArgument(p2.IsRational(), "p2"); m_p1 = p1; m_p2 = p2; }
/// <param name="angleRadians">The angle, in radians, from 3-o'clock going counter-clockwise.</param> public static void DrawLine(this DrawingContext drawingContext, Pen pen, Point startPoint, double angleRadians, double length) { Util.RequireNotNull(drawingContext, "drawingContext"); Util.RequireArgument(startPoint.IsRational(), "startPoint"); Util.RequireNotNull(pen, "Pen"); drawingContext.DrawLine(pen, startPoint, startPoint + GetVectorFromAngle(angleRadians, length)); }
public static double AngleRad(Point point1, Point point2, Point point3) { Debug.Assert(point1.IsRational()); Debug.Assert(point2.IsRational()); Debug.Assert(point3.IsRational()); double rad = AngleRad(point2 - point1, point2 - point3); double rad2 = AngleRad(point2 - point1, (point2 - point3).RightAngle()); if (rad2 < (Math.PI / 2)) { return rad; } else { return (Math.PI * 2) - rad; } }
public static bool Animate( Point currentValue, Vector currentVelocity, Point targetValue, double attractionFator, double dampening, double terminalVelocity, double minValueDelta, double minVelocityDelta, out Point newValue, out Vector newVelocity) { Debug.Assert(currentValue.IsRational()); Debug.Assert(currentVelocity.IsRational()); Debug.Assert(targetValue.IsRational()); Debug.Assert(dampening.IsRational()); Debug.Assert(dampening > 0 && dampening < 1); Debug.Assert(attractionFator.IsRational()); Debug.Assert(attractionFator > 0); Debug.Assert(terminalVelocity > 0); Debug.Assert(minValueDelta > 0); Debug.Assert(minVelocityDelta > 0); Vector diff = targetValue - currentValue; if (diff.Length > minValueDelta || currentVelocity.Length > minVelocityDelta) { newVelocity = currentVelocity * (1 - dampening); newVelocity += diff * attractionFator; newVelocity *= (currentVelocity.Length > terminalVelocity) ? terminalVelocity / currentVelocity.Length : 1; newValue = currentValue + newVelocity; return true; } else { newValue = targetValue; newVelocity = new Vector(); return false; } }