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java.lang.Objectuk.ac.starlink.ttools.plot2.geom.SkySurface
public class SkySurface
Surface implementation for plotting on the celestial sphere. The data coordinates are direction cosines: 3-element arrays containing normalised X,Y,Z coordinates, where each coordinate is in the range -1..+1 and the sum of squares is 1.
Constructor Summary | |
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SkySurface(Rectangle plotBounds,
Projection projection,
double[] rotmat,
double zoom,
double xoff,
double yoff,
SkySys viewSystem,
SkyAxisLabeller axLabeller,
Color gridColor,
Color axlabelColor,
boolean sexagesimal,
double crowd,
Captioner captioner,
boolean antialias)
Constructor. |
Method Summary | |
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boolean |
dataToGraphics(double[] dpos,
boolean visibleOnly,
Point2D.Double gpos)
Converts a data space position to a graphics position. |
boolean |
dataToGraphicsOffset(double[] dpos0,
Point2D.Double gpos0,
double[] dpos1,
boolean visibleOnly,
Point2D.Double gpos1)
Converts an offset data space position to a graphics position. |
boolean |
equals(Object o)
|
SkyAspect |
flatPan(Point2D pos0,
Point2D pos1)
Pan gesture which just translates the entire graphics plane. |
SkyAspect |
flatZoom(Point2D pos,
double factor)
Zoom gesture which just magnifies the entire graphics plane. |
String |
formatPosition(double[] dpos)
Formats the given data space position as a coordinate string. |
Captioner |
getCaptioner()
Returns a captioner suitable for drawing general purpose labels annotating the plot. |
int |
getDataDimCount()
Returns 3. |
Rectangle |
getPlotBounds()
Returns the rectangle within which all of the plot data will appear. |
Insets |
getPlotInsets(boolean withScroll)
Returns the insets that this surface would like to reserve outside the plot bounds. |
double[] |
graphicsToData(Point2D gpos,
Iterable<double[]> dposIt)
Attempst to turn a graphics position into a data position. |
int |
hashCode()
|
void |
paintBackground(Graphics g)
Paints the plot surface background. |
void |
paintForeground(Graphics g)
Paints the plot surface foreground. |
SkyAspect |
projPan(Point2D pos0,
Point2D pos1)
Pan gesture which attempts to rotate the sky while leaving the size and location of the graphics plane unchanged. |
SkyAspect |
projZoom(Point2D pos,
double factor)
Zoom gesture which attempts to zoom the sky, with the cursor staying at the same sky position, while leaving the size and location of the graphics plane unchanged. |
SkyAspect |
reframe(Point2D center,
double factor)
Returns a plot aspect giving the data region defined by a graphics position and zoom factor adjustment. |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SkySurface(Rectangle plotBounds, Projection projection, double[] rotmat, double zoom, double xoff, double yoff, SkySys viewSystem, SkyAxisLabeller axLabeller, Color gridColor, Color axlabelColor, boolean sexagesimal, double crowd, Captioner captioner, boolean antialias)
plotBounds
- graphics region within which the plot must fallprojection
- sky projectionrotmat
- 9-element rotation matrixzoom
- zoom factor; 1 means the sky is approximately
the same size as plot boundsxoff
- x offset of plot centre from plot bounds centre
in dimensionless units; 0 is centredyoff
- y offset of plot centre from plot bounds centre
in dimensionless units; 0 is centredviewSystem
- sky system into which coordinates are projectedaxLabeller
- sky axis labelling objectgridColor
- colour for grid drawing, or null if no gridaxlabelColor
- colour for axis labels, or null if no labelssexagesimal
- whether to use sexagesimal coordinatescrowd
- tick mark crowding factor, 1 is normalcaptioner
- text rendering objectantialias
- whether to antialias grid linesMethod Detail |
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public int getDataDimCount()
getDataDimCount
in interface Surface
public Rectangle getPlotBounds()
Surface
getPlotBounds
in interface Surface
public Insets getPlotInsets(boolean withScroll)
Surface
Surface.getPlotBounds()
to be used for axis labels etc.
If the withScroll
parameter is set, then an attempt
will be made to return insets that will not alter if the current
plot is scrolled around a moderate amount.
For a one-time plot that's not important, but for an interactive
plot it prevents the actual plot position jumping around to
accommodate more or less space on the axes according to exactly
where ticks happen to fall on the axes.
getPlotInsets
in interface Surface
withScroll
- true to reserve space for nicer scrolling
public void paintBackground(Graphics g)
Surface
paintBackground
in interface Surface
g
- graphics contextpublic void paintForeground(Graphics g)
Surface
paintForeground
in interface Surface
g
- graphics contextpublic Captioner getCaptioner()
Surface
getCaptioner
in interface Surface
public boolean dataToGraphics(double[] dpos, boolean visibleOnly, Point2D.Double gpos)
Surface
visibleOnly
is true, then if the return value
is true, the exit value of gPos
is guaranteed
to be within the plot bounds of this surface.
If visibleOnly
is false, there are no guarantees
about the exit value of gPos
, and its coordinates
could be infinite or NaN. In this case you might want to perform
additional checking, for instance with the utility methods
PlotUtil.isPointFinite
or
isPointReal
.
dataToGraphics
in interface Surface
dpos
- dataDimCount-element array containing data space
coordinatesvisibleOnly
- if true, then the conversion will only succeed
when the result falls within the plot bounds
of this surfacegpos
- point object into which the graphics position will
be written on success
public boolean dataToGraphicsOffset(double[] dpos0, Point2D.Double gpos0, double[] dpos1, boolean visibleOnly, Point2D.Double gpos1)
Surface
This (somewhat hacky) method is required for surfaces in which a
data position may map to more than one position in graphics space,
for instance sky surfaces with discontinuous longitude.
The result does not need to be the same as the result of
calling Surface.dataToGraphics(double[], boolean, java.awt.geom.Point2D.Double)
, and is not required to be a legal
graphics position, but it must make visual sense, for instance
when plotting error bars.
The semantics of a "nearby point" is not very well defined.
There are probably situations in which calling this will not
give the result that's wanted, but they will probably be rare.
dataToGraphicsOffset
in interface Surface
dpos0
- context position in data spacegpos0
- context position in graphics space
(result of calling dataToGraphics on dpos0)dpos1
- query position in data spacevisibleOnly
- if true, the call only succeeds if the result is
within the plot bounds of this surfacegpos1
- point object to which the graphics position of
dpos1 will be written on success
public double[] graphicsToData(Point2D gpos, Iterable<double[]> dposIt)
Surface
dposIt
argument can optionally
be supplied to cope with such instances. If a data pos cannot be
determined, null is returned. If dposIt
is absent,
the method will run quickly. If it's present, it may or may
not run slowly.
graphicsToData
in interface Surface
gpos
- graphics pointdposIt
- iterable over dataDimCount-element arrays
representing all the data space positions plotted,
or null
gPos
, or null if it cannot be determinedpublic String formatPosition(double[] dpos)
Surface
formatPosition
in interface Surface
dpos
- dataDimCount-element array giving data space position
public SkyAspect flatPan(Point2D pos0, Point2D pos1)
pos0
- source graphics positionpos1
- destination graphics position
public SkyAspect flatZoom(Point2D pos, double factor)
pos
- reference graphics positionfactor
- zoom factor
public SkyAspect projPan(Point2D pos0, Point2D pos1)
pos0
- source graphics positionpos1
- destination graphics position
public SkyAspect projZoom(Point2D pos, double factor)
pos
- reference graphics positionfactor
- zoom factor
public SkyAspect reframe(Point2D center, double factor)
center
- position in current graphics coordinates of the
sky position requested as the new centerfactor
- zoom factor (from current)
public boolean equals(Object o)
equals
in class Object
public int hashCode()
hashCode
in class Object
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