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java.lang.Objectcds.astro.AbstractRegion
cds.astro.Region
cds.astro.EllipticalRegion
public class EllipticalRegion
Elliptical region on the sky, defined by its center + semi-major axes. The spherical ellipse is defined as the set of points having the sum of their distances to 2 foci F0 and F1 constant; the relation between a (semi-major axis), b (semi-minor axis) and c (semi-distance between foci) is cosa = cosb . cosc. The equation of the spherical ellipse is, if f0 and f1 are the distance to the foci: cos2(f0) + cos2(f1) - 2 cos(2a) cos(f0) cos(f1) = sin2(2a) which is a quadratic expression in x, y, z.
Field Summary |
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Fields inherited from class cds.astro.AbstractRegion |
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centroid, DISJOINT, INCLUDES, INTERSECTS, IS_PARTOF, maxrad, minrad |
Method Summary | |
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double |
area()
Area of an elliptical region. |
int |
checkCircle(Coo point,
double r)
Verify a circle intersects an Ellipse |
boolean |
checkCoo(Coo point)
Verify point within Ellipse |
int |
checkQbox(int qbox)
Intersection of a Qbox with the Ellipse |
java.lang.String |
toString()
Edition of an Ellipse region |
Methods inherited from class cds.astro.Region |
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box, circle, ellipse, ellipse, polygon, rotatedBox, zone, zone |
Methods inherited from class cds.astro.AbstractRegion |
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check1 |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Method Detail |
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public java.lang.String toString()
toString
in class Region
public double area()
area
in class Region
public boolean checkCoo(Coo point)
checkCoo
in class Region
point
- a position
public int checkCircle(Coo point, double r)
checkCircle
in class Region
point
- a positionr
- radius (degrees)
public int checkQbox(int qbox)
checkQbox
in class AbstractRegion
qbox
- the Qbox to check
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