public static bool IntersectCircle(Vector2 position, Vector2 center, float radius,
float minAngle = 0, float maxAngle = 0, bool smallSector = true)
{
NormalizeMinMaxAngle(ref minAngle, ref maxAngle, smallSector);
var fullCircle = minAngle == 0 && maxAngle == 0;
var distanceToCenter = Vector2.Distance(position, center);
if (distanceToCenter <= radius)
{
if (!fullCircle)
{
var angle = MathExtension.NormalizeAngle(GetAngle(position - center));
if (angle >= minAngle && angle <= maxAngle ||
angle + MathHelper.TwoPI >= minAngle && angle + MathHelper.TwoPI <= maxAngle)
{
return(true);
}
}
else
{
return(true);
}
}
return(false);
}
private static void NormalizeMinMaxAngle(ref float minAngle, ref float maxAngle, bool smallSector)
{
minAngle = MathExtension.NormalizeAngle(minAngle);
maxAngle = MathExtension.NormalizeAngle(maxAngle);
if (minAngle > maxAngle)
{
var swap = minAngle;
minAngle = maxAngle;
maxAngle = swap;
}
if (maxAngle - minAngle > MathHelper.PI && smallSector)
{
var oldMinAngle = minAngle;
minAngle = maxAngle;
maxAngle = oldMinAngle + MathHelper.TwoPI;
}
}
public static bool IntersectCircle(Area area, Vector2 center, float radius,
float minAngle = 0, float maxAngle = 0, bool smallSector = true)
{
NormalizeMinMaxAngle(ref minAngle, ref maxAngle, smallSector);
var fullCircle = minAngle == 0 && maxAngle == 0;
var lines = new List <Vector2[]>()
{
new Vector2[] { area.BottomRight, area.BottomLeft },
new Vector2[] { area.BottomLeft, area.TopLeft },
new Vector2[] { area.TopLeft, area.TopRight },
new Vector2[] { area.TopRight, area.BottomRight },
};
foreach (var line in lines)
{
var distanceToCenter = FindDistanceToSegment(center, line[0], line[1]);
if (distanceToCenter <= radius)
{
if (!fullCircle)
{
var corner = line[0];
var angle = MathExtension.NormalizeAngle(GetAngle(corner - center));
if (angle >= minAngle && angle <= maxAngle ||
angle + MathHelper.TwoPI >= minAngle && angle + MathHelper.TwoPI <= maxAngle)
{
return(true);
}
}
else
{
return(true);
}
}
}
return(false);
}