Author: Wolfch!ld (Andras Baranovszky)
Category: Christmas Challenge or Wild
System: C64
Language: BASIC
Len source code: 150 bytes
Len exe file: N/A
Len code only: N/A
Instructions:
Code wirtten with CBM PRG Sutio 4.0 + Vice Emulator 3.6.1 SDL2
Run Vice, drag and drop the prg file into it, wait :)
Description:
I used direct screen memory addresses to POKE stars to screen.
I drawing four 13x13 triangle which overlap each other.
Each poke is somthing like that:
poke a - 5 + x - c + (y*40),42
poke a + 5 - x - c + (y*40),42
poke a - 5 + x + c - (y*40),42
poke a + 5 - x + c - (y*40),42
Where:
"a" center screen memory address of the star (1523)
+/- 5 start drawing stars inside rows (horizontal diffelence from "a")
+/- "x" actual star position inside rows
+/- "c" 9*40 char +/- (vertical diffelence from "a")
+/- "y*40" actual row
42 chr$(42)
Comments:
If you want understand how its work, just delete 1,2 or 3 poke commands or change 42 to 1,2,3,4 in four pokes.
