uk.ac.starlink.ttools.plot
Class ZBufferPlotVolume

java.lang.Object
  extended by uk.ac.starlink.ttools.plot.PlotVolume
      extended by uk.ac.starlink.ttools.plot.ZBufferPlotVolume

public class ZBufferPlotVolume
extends PlotVolume

PlotVolume which uses a Z-buffer to keep track of which pixels are in front. It can only render opaque markers.

Since:
18 Jan 2006
Author:
Mark Taylor

Nested Class Summary
static class ZBufferPlotVolume.Workspace
          Opaque workspace object for use with ZBufferPlotVolume instances.
 
Constructor Summary
ZBufferPlotVolume(Component c, Graphics g, MarkStyle[] styles, double padFactor, int[] padBorders, double fogginess, boolean hasLabels, DataColorTweaker tweaker, ZBufferPlotVolume.Workspace ws)
          Constructs a new plot volume.
 
Method Summary
 void flush()
          Ensures that all points submitted through the plot method have been painted on the graphics context.
 void plot2d(int xp, int yp, double zd, double[] coords, int is, boolean showPoint, String label, int nerr, int[] xoffs, int[] yoffs, double[] zerrs)
          Plots an marker and optional associated error values at a given point in graphics coordinates with given additional Z coordinates.
 
Methods inherited from class uk.ac.starlink.ttools.plot.PlotVolume
createFoggingTweaker, getFogger, getGraphics, getScale, getStyles, packRgba, plot3d, projectX, projectY, unpackRgba
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ZBufferPlotVolume

public ZBufferPlotVolume(Component c,
                         Graphics g,
                         MarkStyle[] styles,
                         double padFactor,
                         int[] padBorders,
                         double fogginess,
                         boolean hasLabels,
                         DataColorTweaker tweaker,
                         ZBufferPlotVolume.Workspace ws)
Constructs a new plot volume.

Parameters:
c - component on which points will be plotted
g - graphics context on which points will be plotted
styles - array of marker styles which may be used to plot
padFactor - minimum amount of space outside the unit cube in both dimensions - 1 means no extra space
fogginess - thickness of fog for depth shading
hasLabels - true if any of the points may have associated labels
padBorders - space, additional to padFactor, to be left around the edges of the plot; order is (left,right,bottom,top)
tweaker - colour adjuster for using auxiliary axis coords
ws - workspace object
Method Detail

plot2d

public void plot2d(int xp,
                   int yp,
                   double zd,
                   double[] coords,
                   int is,
                   boolean showPoint,
                   String label,
                   int nerr,
                   int[] xoffs,
                   int[] yoffs,
                   double[] zerrs)
Description copied from class: PlotVolume
Plots an marker and optional associated error values at a given point in graphics coordinates with given additional Z coordinates. Points with greater Z values should obscure points with lesser ones. The ordering of the error points is that required by the ErrorRenderer class.

Most implementations currently ignore the Z values associated with the error points, and put everything at the depth of the central point, because it's too hard to do otherwise. Does this produce seriously confusing visualisation?

Specified by:
plot2d in class PlotVolume
Parameters:
xp - graphics space X coordinate of the central point
yp - graphics space Y coordinate of the central point
zd - depth of point; a point with a greater z should obscure a point with a lesser one
coords - original coordinate array; as well as (redundant) x,y,z values it may contain auxiliary axis coordinates
is - index of the style used to plot the point
showPoint - whether the central point is to be plotted
label - label for point, or null
nerr - number of error points, or zero for no errors
xoffs - nerr-element array of graphics space X coordinates for error points
yoffs - nerr-element array of graphics space Y coordinates for error points
zerrs - nerr-element array of depths for error points

flush

public void flush()
Description copied from class: PlotVolume
Ensures that all points submitted through the plot method have been painted on the graphics context.

Specified by:
flush in class PlotVolume


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