Commodore 64 Manual de usuario descargar pdf (Pagina 71)

LINE 20:

FORS 1 = 12288

TO 12350

READ Q 1

POKES1,Q1

We are going to use ONE SPRITE(sprite 0) in this

animation, but we are going to use THREEsets of

sprite data to define three separate shapes. To

get our animation, we will switch the POINTERS

for sprite ° to the three places in memory where

we have stored the data which defines our three

different shapes. The same sprite will be rede-

fined rapidly over and over again as 3 different

shapes to produce the dancing mouse animation.

You can define dozens of sprite shapes in DATA

STATEMENTS,and rotate those shapes through

one or more sprites. So you see, you don't have to

limit one sprite to one shape or vice-versa. One

sprite can have many different shapes, simply by

changing the POINTER SETTING FOR THAT

SPRITE to different places in memory where the

sprite data for different shapes is stored. This

line means we have put the DATA for "sprite

shape 1" at memory locations 12288 to 12350.

Reads 63 numbers in order from the DATAstate-

ments which begin at line 100. Q1 is an arbitrary

variable name. It could just as easily be A, Z1 or

another numeric variable.

Pokes the first number from the DATA statements

(the first "Q1" is 30) into the first memory location

(the first memory location is 12288). This is the

same as POKE12288,30.

This tells the computer to look BETWEENthe FOR

and NEXT parts of the loop and perform those

in-between commands (READQ1 and POKES1,Q1

using the NEXTnumbers in order). In other words,

the NEXTstatement makes the computer READthe

NEXTQ1 from the DATASTATEMENTS,which is 0,

and also increments S1 by 1 to the next value,

which is 12289. The result is POKE12289,0. . .

the NEXT command makes the loop keep going

back until the last values in the series, which are

POKE 12350,0.

PROGRAMMINGGRAPHICS 169

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 82 83

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Commodore 64 Manual de usuario Pagina 71

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