public static Vector2 GetNearest(ILine line, Vector2 point)
{
var grad = (line.Point2.Y - line.Point1.Y) / (line.Point2.X - line.Point1.X);
var yint = line.Point1.Y - grad * line.Point1.X;
Vector2 vYint = new Vector2(0, yint);
Vector2 tempPoint = point - vYint;
var tempLine = new MinimalizedShapes.Line(line.Point1 - vYint, line.Point2 - vYint);
var orthogonal = new MinimalizedShapes.Line(tempPoint, new Vector2(tempPoint.X + tempLine.Grad * 10, tempPoint.Y - 10));
return(GetIntersects(tempLine, orthogonal)[0] + vYint);
}
public static Vector2 GetNearest(ICircle cir, Vector2 point)
{
if (cir.Center == point)
{
// https://github.com/Big-BlueBerry/GCS.WPF/issues/8
return(cir.Another);
}
var line = new MinimalizedShapes.Line(cir.Center, point);
var res = GetIntersects(line, cir);
return(Distance(res[0], point) < Distance(res[1], point) ? res[0] : res[1]);
}
public static Vector2[] GetIntersects(ISegment seg, ICircle circle)
{
var lin = new MinimalizedShapes.Line(seg.Point1, seg.Point2);
Vector2[] intersects = GetIntersects(lin, circle);
float len = Distance(seg.Point1, seg.Point2);
if (intersects.Length == 0)
{
return new Vector2[] { }
}
;
var d01 = Distance(intersects[0], seg.Point1);
var d02 = Distance(intersects[0], seg.Point2);
if (intersects.Length == 1)
{
if (d01 < len && d02 < len)
{
return(intersects);
}
else
{
return new Vector2[] { }
};
}
else
{
var d11 = Distance(intersects[1], seg.Point1);
var d12 = Distance(intersects[1], seg.Point2);
if (d01 < len && d02 < len)
{
if (d11 < len && d12 < len)
{
return(intersects);
}
else
{
return new Vector2[] { intersects[0] }
};
}
else if (d11 < len && d12 < len)
{
return new Vector2[] { intersects[1] }
}
;
else
{
return new Vector2[] { }
};
}
}
