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  Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770


  Plots colorful bar charts

Calling Sequence

  PLOTCOLORFILL, x, y, COLOR=col, BOTTOM=bot, WIDTH=wid, ...


  PLOTCOLORFILL plots a colorful vertical bar chart. This may be
  useful in cases where two dimensions of information need to be
  conveyed in one plot. [ I use it to show total intensity as a
  function of time on the vertical axis, and temperature is coded
  with color. ]
  Most aspects of the bars are configurable. The color is specified
  by an array of colors, one for each bar. [ Alternatively, a
  single color for the entire plot can be given. ] Also, one color
  can be designated as transparent.
  Stacked bar charts can be constructed using two calls to
  PLOTCOLORFILL. See the example.


  X, Y - Two arrays which give the X and Y position of the points.
          In this style of plot, the x values should be monotonically
          increasing, but not necessarily monospaced (see WIDTH).

Optional Inputs


Input Keyword Parameters

  COLOR - an array giving the color of each bar, or alternatively a
          scalar color for all of the bars. The current color table
          is not changed. Default is color "1"
  BOTTOM - normally the bottom of the bars is set to be zero. You
            may either specify a scalar bottom value for all of the
            bars, or an array giving the bottom of each bar
            individually. See the example to see how stacked bar
            charts can be constructed with this keyword.
  WIDTH - sets the width of each bar, globally or individually.
          Bars are centered on the "X" value, and extend 0.5 * WIDTH
          to either side. Default is to assume monospacing, using
          the separation between the first two x values. If only
          one data value is present, then a width of 1 is used.
  MIDPOINT - if set, then ignore the WIDTH keyword value, and
              instead construct bin edges which lie at the midpoints
              between data points. This is usually the most
              straightforward way to connect irregularly sampled
              points "like a histogram," although at the expense of
              not having a direct relation between X and the bin
  NOERASE - if set, do not erase an existing plot before rendering
            colored histogram. The effect is comparable to "OPLOT",
            or the OVER keyword to CONTOUR.
  NOTRACE - if set, do not draw a linear trace at the top of the
  TRANSPARENT - designates a color which is "transparent". Any bars
                with this color are simply not rendered. Default is
                no transparent color.
  PANEL, SUBPANEL - An alternate way to more precisely specify the
                    plot and annotation positions. See SUBCELL.
                    Default is full-screen.
  POSITION - Position of the bar chart in normal coordinates.
              Overrides position given by PANEL/SUBPANEL.
  Other keywords are passed to the plot command directly.





  Stacked barcharts can be constructed by first making one chart
  with a flat bottom, and then a second chart whose bottom is top of
  the first.
  x = findgen(30)
  y1 = x^2
  y2 = 400.-x
  c1 = bindgen(30)*3+1b
  c2 = 100b-bindgen(30)*3+1b
  plotcolorfill, x, y1, color=c1, bottom=0.
  plotcolorfill, x, y1+y2, color=c2, bottom=y1, /noerase

See Also


Modification History

  Written, CM, 1997
  Added NOERASE, NOTRACE and MIDPOINT keywords, CM 11 Feb 2000
  Logarithmic plots now work; so does the THICK keyword, CM 02 Apr
  Optimize drawing when the bin is zero, CM 04 Apr 2001
  Try to handle YRANGE more properly, since there seem to be some
    cases where the overlayed axes were erroneous, CM 15 Mar 2002
  This time YRANGE tweaking with PANELs, CM 13 Jun 2002

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