Loadstar 24/024.d81/t.draw tab.128

Text File | 1986-01-01 | 4.4 KB | 275 lines

    COMMODORE 128 DRAWING TABLET
                by
         John J. Kottler


COMMODORE MICROCOMPUTERS MAGAZINE
May/June, 1986
p.92


**************************************
NOTE:  This program is written for
the Commodore 128.  Because of this,
it cannot be run directly from
LOADSTAR.  To run this program, simply
turn your 128 off, then back on again.
This should put you in 128 mode.
After this, all you need to do is
type DLOAD"DRAW TABLET.128".
When the READY prompt appears, type
RUN and press RETURN.
**************************************


  One of the most powerful features

of the C-128 is its graphics

capabilities; 128 DRAWING TABLET lets

you harness these capabilities with

joystick and keyboard entries.


  To use this program, you must first

have your joystick plugged into Port

2.  Once you run the program, you

will first see a cross-hair appearing

in the center of the screen.  The

program also displays instructions for

each drawing and painting mode at the

bottom of the screen.  If you need

help at any time while running this

program, pressing the HELP key will

display the list of commands used.


  The first mode that you will be in

is the DRAWING MODE.  In the

instruction window for this mode are

the various key presses you must make

to alter colors, brush sizes, and

brush speeds.


  In the DRAWING MODE, pressing 0

through 3 on the keyboard selects the

drawing color, SHIFT 1 through SHIFT 5

selects brush size, and COMMODORE 1

through 5 changes the brush speed.

The selection for the brush speed and

size is displayed by the two numbers

appearing at the right side of the

screen.


  If you want to accelerate movement

of the cursor while drawing, you may

choose the BURST MODE by pressing the

SPACE BAR to speed up the process.

This option will also work with the

paint, circle, box, and line modes.

Pressing the SPACE BAR will return

the cursor to normal speed.


  To select the colors you wish to

use for the picture itself, the

background, and the border, press the

CLR/HOME key.  You must press keys 1

through 3 to select a color for Color

One, Color Two, and Color Three.  Keys

4 and 5 allow you to change the

background and border colors.


  Once you have chosen the color you

wish to change, a color bar will

appear in the current color.  By

using the up and down arrow keys, you

may step forward and backward through

the different colors possible.  When

you find the shade you like, press

either RETURN or the left arrow key to

update the color.


  This option allows you to use more

than three colors in your drawings

because it updates only the current

drawing colors, not the colors already

on the screen.  If you want to clear

the screen, press the SHIFT CLR/HOME

combination.


GRAPHICS COMMANDS


  DRAWING TABLET retains all of the

Commodore 128 box, circle, line,

paint, and text commands.  Pressing

the first letter of the command mode

you wish to use ("B" for BOX MODE,

for example) selects that mode.  With

each mode, you will see brief

instructions outlining the type of

input needed and then prompts to set

the parameters of your graphic.


  Remember to press RETURN to enter

your responses.  You may use the

ESCAPE key to abort.


DISK COMMANDS


  To save your work, press the SHIFT-S

combination.  You will be prompted to

enter a filename for your picture.

If you wish to retrieve a picture,

press the SHIFT-L combination and

enter the appropriate filename.  To

read the disk directory, press

SHIFT-D.


  If your disk has many pictures on

it, you may need to use one of the

four disk commands from a small menu

that can be accessed with the SHIFT-W

combination.  These commands will

format a new disk, erase or rename a

file, or "clean-up" your disk.


  If you are formatting a disk, enter

the "header name and disk id" and

press RETURN. To rename a file, enter

"new filename = old filename" and

press RETURN.


USING YOUR GRAPHICS IN YOUR PROGRAMS


  You can load the graphics that you

create into your BASIC programs with

the following commands:


BLOAD "SC/FILENAME",BO,P 7168.  This

command loads the high-resolution

screen and Color 1 and Color 2 data.


POKE 1,116 :BLOAD "CL/FILENAME",B15,P

55296:POKE 1,115: This loads Color 3

data.


BLOAD "BC/FILENAME",B15,P 53280:  This

loads the background and border

colors.


FILES REQUIRED:

DRAW TABLET.128

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