Class SkyDensityPlotter
- All Implemented Interfaces:
Plotter<SkyDensityPlotter.SkyDenseStyle>
Note it only works with a SkySurface.
- Since:
- 20 Sep 2015
- Author:
- Mark Taylor
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
Style for configuring with the sky density plot. -
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final PerUnitConfigKey<SolidAngleUnit>
Config key for solid angle units.Config key for combination mode.Report key for HEALPix tile area in square degrees.Config key for transparency. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncreateLayer
(DataGeom geom, DataSpec dataSpec, SkyDensityPlotter.SkyDenseStyle style) Creates a PlotLayer based on the given geometry, data and style.createStyle
(ConfigMap config) Creates a style that can be used when creating a plot layer.Returns an object describing which data coordinates are used for this plotter and how they are arranged in supplied DataSpec objects.static int
getPixelLevel
(SkySurface surface) Calculates the HEALPix level whose pixels are of approximately the same size as the screen pixels for a given SkySurface.Returns an XML description of this plotter.Returns an icon for this plotter for use in user interface.Returns the name of this plotter for use in user interface.Returns an opaque object characterising the region of the plot surface covered when using a given plotter style.ConfigKey<?>[]
Returns the configuration keys used to configure style for this plotter.boolean
Indicates whether the drawings produced by this plotter will return general interest report information to upstream plotting code.static double
vectorSeparation
(double[] p1, double[] p2) Angle in radians between two (not necessarily unit) vectors.
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Field Details
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TILESIZE_REPKEY
Report key for HEALPix tile area in square degrees. -
TRANSPARENCY_KEY
Config key for transparency. -
COMBINER_KEY
Config key for combination mode. -
ANGLE_KEY
Config key for solid angle units.
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Constructor Details
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SkyDensityPlotter
public SkyDensityPlotter(boolean transparent, boolean hasWeight) Constructor.- Parameters:
transparent
- if true, there will be a config option for setting the alpha value of the whole layerhasWeight
- if true, an optional weight coordinate will be solicited alongside the positional coordinates
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Method Details
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getPlotterName
Description copied from interface:Plotter
Returns the name of this plotter for use in user interface.- Specified by:
getPlotterName
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- user-directed plotter name
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getPlotterIcon
Description copied from interface:Plotter
Returns an icon for this plotter for use in user interface.- Specified by:
getPlotterIcon
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- plotter icon
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getCoordGroup
Description copied from interface:Plotter
Returns an object describing which data coordinates are used for this plotter and how they are arranged in supplied DataSpec objects.- Specified by:
getCoordGroup
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- coordinate group
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hasReports
public boolean hasReports()Description copied from interface:Plotter
Indicates whether the drawings produced by this plotter will return general interest report information to upstream plotting code.- Specified by:
hasReports
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- true if the plot report may return interesting information
- See Also:
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getPlotterDescription
Description copied from interface:Plotter
Returns an XML description of this plotter.Note: really this should appear at the LayerType level.
- Specified by:
getPlotterDescription
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- one or more <p> elements
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getStyleKeys
Description copied from interface:Plotter
Returns the configuration keys used to configure style for this plotter. The keys in the return value are used in the map supplied to thePlotter.createStyle(uk.ac.starlink.ttools.plot2.config.ConfigMap)
method.- Specified by:
getStyleKeys
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Returns:
- keys used when creating a style for this plotter.
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createStyle
Description copied from interface:Plotter
Creates a style that can be used when creating a plot layer. The keys that are significant in the supplied config map are those returned byPlotter.getStyleKeys()
. The return value can be used as input toPlotter.createLayer(uk.ac.starlink.ttools.plot2.DataGeom, uk.ac.starlink.ttools.plot2.data.DataSpec, S)
.- Specified by:
createStyle
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Parameters:
config
- map of style configuration items- Returns:
- plotter-specific plot style
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getRangeStyleKey
Description copied from interface:Plotter
Returns an opaque object characterising the region of the plot surface covered when using a given plotter style. If this object changes between layers produced by this plotter, it provides a hint that it may be necessary to redetermine the axis ranges (usingextendCoordinateRanges
).In many cases, such as scatter-plot-like plotters, the range is determined only by the coordinate data (managed by
DataSpec
inputs) so a null value may be returned. This method is chiefly required by histogram-like plotters for which the region on the plot surface is not the union of the input positions.- Specified by:
getRangeStyleKey
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Parameters:
style
- plot style to assess- Returns:
- opaque object with equality semantics, or null if axis range is not a function of style
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createLayer
public PlotLayer createLayer(DataGeom geom, DataSpec dataSpec, SkyDensityPlotter.SkyDenseStyle style) Description copied from interface:Plotter
Creates a PlotLayer based on the given geometry, data and style.The
style
parameter is the result of a call toPlotter.createStyle(uk.ac.starlink.ttools.plot2.config.ConfigMap)
.The
dataSpec
parameter must contain the coordinates defined by this plotter's CoordGroup.The
pointDataGeom
parameter is only used if theCoordGroup.getBasicPositionCount()
orCoordGroup.getExtraPositionCount()
method from this plotter's CoordGroup return a non-zero value, otherwise the plot does not have point positions.It is legal to supply null for any of the parameters; if insufficient data is supplied to generate a plot, then the method should return null.
Creating a layer should be cheap; layers may be created and not used.
- Specified by:
createLayer
in interfacePlotter<SkyDensityPlotter.SkyDenseStyle>
- Parameters:
geom
- indicates base position coordinates and their mapping to points in the data spacedataSpec
- specifies the data required for the plotstyle
- data style as obtained fromcreateStyle
- Returns:
- new plot layer, or null if no drawing will take place
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getPixelLevel
Calculates the HEALPix level whose pixels are of approximately the same size as the screen pixels for a given SkySurface. There is not an exact correspondance here. An attempt is made to return the result for the "largest" screen pixel (the one covering more of the sky than any other).- Parameters:
surface
- plot surface- Returns:
- approximately corresponding HEALPix level
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vectorSeparation
public static double vectorSeparation(double[] p1, double[] p2) Angle in radians between two (not necessarily unit) vectors. The code follows that of SLA_SEPV from SLALIB. The straightforward thing to do would just be to use the cosine rule, but that may suffer numeric instabilities for small angles, so this more complicated approach is more robust.- Parameters:
p1
- first input vectorp2
- second input vector- Returns:
- angle between p1 and p2 in radians
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