.CHART SET BG WALLPAPR

This subroutine sets the background image of the "current" chart spec. The image will be tiled across the background of the chart, if you want a singe image, use .CHART SET BG IMAGE instead.

Usage:

      PASS         <image_pathname>      FIELD            SHARE? N
      GOSUB    0CD .CHART SET BG WALLPAPR
      *        Check for error
      IF       0CD .CHART SET BG WALLPAPR        NE

Description:

This subroutine sets a background image for the "current" chart spec. The image will be tiled across the background of the chart. This routine receives image_pathname as an optional parameter.

If the parameter is not received or if the value received is blank, then the background image of the chart spec is cleared and the default background color will be rendered.

The image_pathname can be either a complete path to a file, or the name of an image in the default images directory (as specified on the parameter file).

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-- JeanNeron - 2011-09-22