Do you know what the world needs?

...Another Etch-a-Sketch clone for the Speccy!  That's what.

Keys: Q,A,O,P move
	  C clear
	  S shrink/small/stickers etc. (enters little mode)


Why this etch-a-stetch is great (see footnote 1)
-------------------------------

1. All BASIC
	I resisted the urge to do some of the things in m/c code - which would have been FAR EASIER. Most notably the lack of bitwise operators in BASIC made key reading, and the pixel to byte stuff is arduous.

2. Q,A,O,P keys.
	None of your joystick rubbish here - just good old QAOP ... but you CAN use diagonals. And it works regardless of which issue Speccy it is.	
	
3. It emulates the ZX81 style block graphics
	Pixels my arse. Etch-a-sketch clones should use quarter cell blocks. Fact.
	
4. Nearly quadrent-style graphics
	I discovered a quirky thing I didn't know about the SCREEN$ basic command - it ALSO identifies inverted versions of characters - so my sneaky plan of making the GRAPHICS blocks the characters, so I could use SCREEN$ didn't work.  It identified ". " (bottom left) as "':" (everything except bottom left), as the latter one appears earlier in the character set. That's why I have corrupted the top left pixel of each graphic block, to make them unique. What a faff. The initialisation bit at the start is printing the graphics blocks to the screen - removing the top left pixel if it's filled (POINT and PLOT IVNVERSE 1;, then copying this info to memory - and pointing the CHARS variable at it.  All this 'cos Speccy basic doesn't have a 'chunky plot' command.

5. Maths, Pokes, Peeks, Points, Plots
	I cleverly hid some shenanigans in the top of the screen to do some bit-wise operations. Moving onto a previously filled square uses SCREEN$ to identify the character, then pokes into the screen the character, and uses PLOT to add the correct quadrent (top right = bit 0, top left = bit 1, bottom right = bit 2, bottom left = bit 3).  THis is functionally a bitwise OR. I was pleased with this. #smugbastard

6. Small Mode
	The 's' key is stupid, and reminds me of those photo booths in Japan that make little stickers.  S can stand for shrink or small or sticker. Your choice.
	Upon pressing 'S' the enormous delay is POINTwise looking at all the information on the screen (well one in each 4x4 pixel block), which are grouped into eights and poked as into bytes that are poked into memory. Then the character set is pointed at them, so they can be quickly printed to the screen, in 'little.
	
7. Functionally small and cute.
	Awww!
	Once little you can CARRY ON editing, using the same keys (it's the same basic loop, optimised to be near the top of the program, cos I'm like that), and continuing in 'small mode'.	Pressing 'S' again finished the program.


	
Enjoy/endure
Andy.
3/2/23



footnotes:

1. It's not great.