Radio Shack 26-1145 Operation Manual

Computer Graphics Operation Manual
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program -- each real number in your storage array uses four
memory locations (bytes).
The array must be large enough to hold your graphic display
and the rectangular area must include all the points you
want to store.
Your GET rectangular pixel area can include the entire
screen (i.e., GET(~,~)-(639,239),array name), if the array
is dimensioned large enough.
To determine the minimum array size:
1. Divide the number of X-axis pixels by 8 and round up to
the next higher integer.
2. Multiply the result by the number of Y-axis pixels.
When counting the X-Y axis pixels, be sure to include the
first and last pixel.
3. Add four to the total.
4. Divide by four (for real numbers) or two (for integers)
rounding up to the next higher integer.
The size of the rectangular pixel area is determined by the
(~) coordinates used in GET:
Position: upper-left corner = startpoint = (xl,yl)
lower-left corner = endpoint = (x2,y2)
Size (in pixels): width = x2-xl+l
length = y2-yl+l
Example
This block is 71 pixels wide on the X-axis (l~ through 8~)
and 41 long on the Y-axis (l~ through 5~).
For real: 71/8 = 9 * 41 = 369 + 4 = 373/4 = 94
For integer: 71/8 = 9 * 41 = 369 + 4 = 373/2 = 187
Depending on the type of array you use, you could set up
your minimum-size dimension statement this way:
Real
DIM V( 93)
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Radio Shack 26-1145 Specifications

General

Brand	Radio Shack
Model	26-1145
Category	Desktop
Language	English