Commodore 64 Uživatelský manuál stáhnout pdf (Strana 65)

CREATING A SPRITE . . . STEP BY STEP

To make this as easy as possible for you, we've put together this

simple step by step guide to help you draw your own sprites.

STEP 1:

Writethe spritemaking program shown here ON A PIECEOF PAPER.

note that line 100 starts a special DATAsection of your program which

will contain the 63 numbers you need to create your sprite.

~m:mm

10 PR HIT":1" : POKE53;,80, 5 :POKE53281 , 6

20 V=53248:POKEV+34,3

30 POKE53269,4:POKE2042,13

40 FORH=(;H062: READQ:POKE':'32+t.l.. Q :t.jEXT

100 DATA255,255,255

1'211 DATAI28,0..1

102 DATAI28..0.. 1

103 DRTAI28, 0..1

1(14 DATAI44.0.1-

105 Dt1TI"I144..0..1-

106 DATAI44,0,1-

107 DRTI"I144..0, 1-

108 DATAI44,0,1-

109 DATAI44,O,I-

110 DATAI44,Q,1-

111 DATAI44,0,1-

112 DATAI44,0,1-

113 DATAI44..(I, 1-

114 DATAI28, 0..1-

115 DATAI28, 0..1-

116 DATAI28,O,I-

117 DATA128, 0.. 1-

11:3 DATA128..0..1-

119 DATAI28,0,1-

12121DATA255., 255., 255

:2(10 :.<:=200: 'T'=1(1(1: POKE53252.. :":: POKE53253.. 'r'

STEP 2:

Color in the pixels on the spritemaking grid on Page 162 (or use a piece

of graph paper. . . remember, a sprite has 24 squares across and 21

squares down). We suggest you use a pencil and draw lightly so you can

reuse this grid. You can create any image you like, but for our example

we'll draw a simple box.

STEP 3:

look at the first EIGHTpixels. Each column of pixels has a number (128,

64, 32, 16, 8, 4, 2, 1). The special type of addition we are going to

show you is a type of BINARYARITHMETICwhich is used by most com-

PROGRAMMING GRAPHICS 163

2664

32 1

6 6 4

2 , 12864 32 16' 8 4

2 ,

12864 32 '6 6 4 2 ,

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 82 83

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