              Changes made between Versions !PolyDraw
                 last updated on last date below

  date    Version  changes
20 Mar 96       - allow use of perspective in plotting 3D solid
26 Mar 96       - allow continuous rotations by holding down CTRL key
12 Apr 96  2.00 - allow changing the light direction for shaded 3D plots
 3 May 96       - allow plotting of star polyhedra 
 5 May 96       - complain if find  partial net
?  Aug 96  2.01 - libraries now compatible with new version RISC OS (StrongARM)
20 Jun 97       - extra item 'Dual' added to 3D Menu
28 Jun 97  2.02 - changed the directory structure, new Directories:
                    PolyLists - for PolyList files and PolyTitle
                       changed format to add a 1st line with title for window
                    Resources - for Messages, Choices, extra Sprites
                       changed format of Choices to add Polylist
                       added Messages file for some error messages
                - changed read data file routines,
                    these are now identical in !Polynet and !PolyDraw
                    no longer allow partial net data
                - can now display a Dual of the polyhedron if it is given 
                  in the data and that filename is in the current PolyList
                - allow display of a datafile by dropping it on to the icon
                  on the icon bar
                - allow change of the Polylist file by dropping it on to the
                  icon on the icon bar (must be in directory PolyLists)
                - allow datafiles with only a net, no 3D data
                - fixed bug in making Drawfiles, 'wire' format
                   for some directions only used to crash with an error
                   message something like Floating point exception
18 Jul 97  3.00 - changed method of making the Selections
27 Jul 97  3.01 - much more Choices saved
                - E code changed from 'Regular' to 'Space-filling' 
                     (Regular is the same as Platonic)
                - interactive help in Messages file;
                  also help on panes window.
25 Aug 97  3.02 - File type PolyData issued (&152) so double-clicking on
                  a data filer icon plots the data
                - more colouring schemes including Red/Green stereo.
                - shading under user control for all colouring schemes
                - user can change colours with colourpicker, (includes NONE)
                - examine and edit the data file by 'adjust' over list icon
29 Aug 97  3.03 - allow length and angle measurements on 3D solid using
                   tools pane or keyboard 'short cuts'
21 Nov 97  3.04 - allow a 'full sort' for difficult overlapping faces
                - writes out a changed PolyData file
                - writes out a POVray data file 
                - extra icons added to the tools pane for the 3 lines above
                - improved search for 'dual' name, now looks for whole name
                - an initial bad polylist can now be skipped
                - key F3 can be used to save the last used 3D type of file 
23 Mar 98 3.05  - enhanced display methods
                - allow space for all !Stellate solids
                - many minor bug fixes/improvements
05 May 98 3.06  - allows more complicated faces from !Stellate vers 1.05
15 Jul 98 3.07  - improved vertex/face finding
                - calculation of the areas of faces and of the solid
24 Feb 98 3.08  - new face sorting for plotting complicated solids
                - minor bug fixes.
08 Mar 99 3.09  - bug fix for plotting non-convex polygonal faces
                - transmission of Wythoff symbols for uniform polyhedra
26 Apr 99 3.10  - allow saving more than once to sloppy applications
                - larger 3D display window.
17 Nov 99 3.20  - PolyData format enhanced to allow !Stellate's split faces
                - Component colouring for 4 components
                - No longer allows divided star data so W70 - W79
                   on extra data disk 2 need update
                   (send for copy or download from www)
                - Allow long file names for RISC-OS 4.
26 Nov 00 3.21  - Increased dimensions to allow for uniform polyhedra on
                   extra disc 4; Run size now 420K.
04 Feb 01 3.22  - Fix to face sorting to correct W54.
01 Mar 01 3.23  - Demo version is now a disabled full version;
                - continuous rotations also by <Ctrl> + click over tools pane.
11 Jun 01 3.24  - Allows changing line widths and 3D window size;
                - immediate printing of 3D image or net through printer driver;
                - interactive help for menus;
                - 'Name' selection case insensitive.
19 Dec 01 3.25  - symmetry data from PolySymm transmitted;
                - allow changing line and background colours.
22 May 02 3.26  - made concave hinges grey, not white in Net on VDU and in Draw;
                - VirtualAcorn compatible demo.
