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public static Subtract ( |
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public void ApplyPoint(PointF point)
{
var offset = point.Subtract(_startPoint);
if (points.Count == 0)
{
points.Add(new GesturePoint { X = offset.X, Y = offset.Y, threshold = 10 });
}
else
{
var last = points.Last();
var lastPoint = new PointF(last.X, last.Y);
// first check distance from last point
if (lastPoint.DistanceTo(offset) > 10)
{
var currentAngle = _previousOffset.AngleTo(offset);
var previousAngle = lastPoint.AngleTo(_previousOffset);
var da = currentAngle - previousAngle;
if (da < -Math.PI) da += 2 * Math.PI;
if (da > Math.PI) da -= 2 * Math.PI;
if (da > 0.1)
{
AddPoint(_previousOffset);
}
}
}
_previousOffset = offset;
}
public static float Subtend(this PointF point, PointF a1, PointF a2)
{
a1 = a1.Subtract(point);
a2 = a2.Subtract(point);
float angleA = a1.Angle(), angleB = a2.Angle();
if (angleA > angleB)
{
float swap = angleA;
angleA = angleB;
angleB = swap;
}
return (float)((angleB - angleA + (Math.PI * 2)) % (Math.PI * 2));
}
/// <summary>Translates a <see cref="T:System.Drawing.PointF" /> by the negative of a given <see cref="T:System.Drawing.Size" />.</summary>
/// <returns>The translated <see cref="T:System.Drawing.PointF" />.</returns>
/// <param name="pt">The <see cref="T:System.Drawing.PointF" /> to translate.</param>
/// <param name="sz">The <see cref="T:System.Drawing.Size" /> that specifies the numbers to subtract from the coordinates of <paramref name="pt" />.</param>
/// <filterpriority>3</filterpriority>
public static PointF operator -(PointF pt, Size sz)
{
return(PointF.Subtract(pt, sz));
}
private bool TestCrossing(GestureQuad quad, PointF p, PointF p2)
{
var q = quad.C;
var q2 = quad.D;
var r = p2.Subtract(p);
var s = q2.Subtract(q);
var qp = q.Subtract(p);
var rs = r.Cross(s);
// parallel case
if (rs == 0) return false;
var t = qp.Cross(s) / rs;
var u = qp.Cross(r) / rs;
return (t >= 0 && t <= 1 && u >= 0 && u <= 1);
}
/// <summary> /// Checks if two points are within a certain distance from each other. /// </summary> public static bool Equals(this PointF value, PointF other, double maxDistance) => value.Subtract(other).LengthSquared() < maxDistance * maxDistance;
public static Rectangle FromCenterSize(PointF Center, PointF Size)
{
Size = Size.Divide(2);
return new Rectangle(new Line(Center.Subtract(Size), Center.Add(Size)));
}
