#1020 xyplot xconfig / yconfig -scale not working

[Paul Vogel]

Using the xconfig or yconfig command with the -scale option results in an "Unknown or invalid value" error.

Script showing problem:

package require Tk
package require Plotchart

canvas .c
pack .c

set s [Plotchart::createXYPlot .c {0 100 10} {0 100 10}]
$s xconfig -scale {0 200 20}

The problem is in Plotchart::AxisConfig, in the file plotaxis.tcl around line 492. The "idx" value is the index into a list with a single value per option, and it is used to index into the axis_option_values which has two values per option. One possible fix is to multiply the idx by 2 before using it on the axis_option_values.

set clear [lindex $axis_option_clear $idx]
>> set idx [expr {2 * $idx}]
set values [lindex $axis_option_values [incr idx]]

Also, in the plotaxis.tcl file there is "console show" and "puts" command in the Plotchart::DrawXaxis routine which seem out of place.

Thanks,
-paul

[Arjen Markus]

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The console show/puts commands are already gone - they were indeed way out of place,
except for debugging purposes ;).

The -scale option is more serious: I will look into this. Thanks for reporting it.

[Arjen Markus]

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I have been looking into this:
- The fix you suggest solves the immediate syntactical problem
- The scale values for the axis remain unchanged though - you get the same axis back.
- When I fixed that bit, I got strange results (the wrong range, only a part of the labels I
expected drawn).
- The code as it is is too naive: I need to change a few private variables in the scaling array
as well (they hold the transformation from world coordinates to pixels)