is pixel exact printing possible on the cpc 464 in basic?

[the777]

ive had a look at google but cant find anything. i know it was possible on the zx spectrum but difficult. any ideas?

thanks for all your help btw

[andycadley]

Yes, use TAG to enable "Text at Graphics Cursor" mode and then MOVE to move the graphics cursor to the relevant pixel position. 

[eto]

Keep in mind that it's slower than the normal PRINT command. 

Btw: Locomotive BASIC is quite powerful but you will not find a lot of great examples with Google unfortunately. I would strongly suggest to read the Amstrad CPCs manual to get an overview of all its commands. It's really a great resource. 

https://www.cpcwiki.eu/manuals/AmstradCPC6128-hypertext-en-Sinewalker.pdf

[MoteroV4]

This is a modified example from the CPC6128 manual, to explain interruptions (DI command), but now (besides works in 464), moves a little sprite to the pixel. Hope it help you.

Code Select Expand

10 MODE 1:TAG
20 EVERY 50 GOSUB 140
30 x1=RND*320: x2=RND*320
40 y=200+RND*200
50 FOR x=320-x1 TO 320+x2 STEP 1
60 DI:'*** disable IRQs to print char
70 MOVE x,y
80 c$=CHR$(ROUND(RND(251)+248))
90 PRINT " ";c$;
100 CALL &BD19:'MC WAIT FLYBACK
110 EI:'*** enable IRQs
120 NEXT
130 GOTO 30
140 '******* sub print shoot
150 MOVE 320,0
160 DRAW x+8,y-16
170 RETURN


[the777]

deleted

[the777]

Yes, use TAG to enable "Text at Graphics Cursor" mode and then MOVE to move the graphics cursor to the relevant pixel position.

this works but it leaves a couple of weird characters next to it

[eto]

this works but it leaves a couple of weird characters next to it

add a semicolon at the end of the print statement

10 TAG
20 MOVE 325,202
30 PRINT "x";

[the777]

this works but it leaves a couple of weird characters next to it

add a semicolon at the end of the print statement

10 TAG
20 MOVE 325,202
30 PRI

i did, it still does it

https://postimg.cc/YvMQVqWf/56eb58d0

https://postimg.cc/WFzLTkdG/e93e9dd3

even if i use print "A"; at line 260

i think it may have something to do with the inkey command because depending on what 1 or 2 arrow key(s) i press, it changes the amount of characters

[andycadley]

Because line 280 is doing PRINT INKEY(0) without a semicolon, so it is printing new line characters (because TAG mode always prints the character)