image plot not displayed with small images on windows terminal

[Benjamin L. <lin...@gm...>]

Hello,

This is a bug that was reported on octave's bug list.
I am moving the topic here, since I believe there is an issue with
gnuplot's windows terminal.

The problem is that images plotted are not drawn if the images are
small and the x/y ranges are shrinked.

Following testcase:

set term windows
plot "-" matrix with image
1 2
3 4
e
e

works ok, but if you add

set xrange [0:1]; set yrange [0:1];

then the plot window is blank.

This is the same if you increase the matrix size.
For 6x6 it shows a blank window:

set term windows
set xrange [0:5]; set yrange [0:5]
plot "-" matrix with image
1 0 0 0 0 0
0 1 0 0 0 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 0 1 0
0 0 0 0 0 1
e
e


For 7x7 it now works

set term windows
set xrange [0:6]; set yrange [0:6]
plot "-" matrix with image
1 0 0 0 0 0 0
0 1 0 0 0 0 0
0 0 1 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
0 0 0 0 0 0 1
e
e

An interesting artefact is when you do

set term windows
set xrange [1:6]; set yrange [1:6]
plot "-" matrix with image
1 0 0 0 0 0
0 1 0 0 0 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 0 1 0
0 0 0 0 0 1
e
e

Which shows a single yellow rectangle in the upper right corner of the graph

All these work for the wxt terminal.

I tested this using the 2009-07-08 CVS 4.3.0 snapshot under windows.

benjamin