DPW2 Graphic Assembler

DPW2 GRAPHIC ASSEMBLER


by Robert Glavas


from ZX Computing May 1987





PICASSO





A drawing utility by Robert Glavas.





[I've no idea why the magazine decided to title this program "Picasso", as]


[it bears no relation to the actual title given by the author. JimG]








Some machine code routines make this stand out from most of the drawing


programs we receive. Included are: a synchronized cursor (interrupt


driven), fast drawing, Kempston / keyboard operation and user-defined grids.





Type in the listing and SAVE it. Run it and make any necessary


corrections then save the final version with SAVE "PICASSO" LINE 1 so


that future loadings autorun.








Menu





The program is menu driven and the options are:





1. EDIT


This is the main drawing screen; you control the cursor either by the


keyboard (the keys are user definable from option 'R') or a Kempston


compatible Joystick and Interface.





The ENTER key is used to switch between modes. The current state is


displayed at the bottom right of the screen and the modes are activated


by pressing the fire button or pressing the selected fire key.





The modes are:





PLOT: Plots a point on the screen at the current cursor position in the


selected INK colour.


DRAW: Draws a line from the last point plotted or previously drawn to,


to the present cursor position.


CIRC: Defines the present cursor position as the centre of a circle,


then use Left/Right to increase or decrease the Radius. Pressing fire


draws the circle or Space exits the routine.


DEL.: Deletes the last thing drawn on the screen.





To return to the menu press the space bar.





2. ALTER GRID


Allows you to specify the grid size.





3. PRINTOUT


Produces a printer copy of either the drawings or the program that will


create it. Tested on ZX compatible printers, ZX LPRINT 3 and KEMPSTON


interfaces.





4. VIEW PROGRAM


Lists the program commands on the screen.





5. SAVE


Saves the picture to tape.





6. LOAD


Loads a picture from tape.





0. NEW


Resets the program.





J. JOYSTICK/KEYBOARD


Changes mode of control.





R. REDEFINE KEYS


Set up the control keys to suit yourself.





7. ALTER TIME DELAY


Specifies the cursor speed.





C. CHANGE COLOUR


Allows you to select INK and PAPER colours.





G. GRID ON/OFF


Toggles the grid facility.





There is a display of the status shown on the menu page which will


remind you of the existing settings.








--


Another Fine Product transcribed by:


Jim Grimwood, Weardale, England (http://www.users.globalnet.co.uk/~jimg/)


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