... 10 cl=1800: CONST x=0,y=1,clr=2,r=3 ... /> 20 FOR i=0 TO cl:
LET c ... :
FOR i=0 TO cl:
LET c( ... CLS: PLOT c():
WAIT SCREEN:
LOOP
[/code]< ... tapping (or pasting) in and giving a quick whirl.

... />
SUB planet(x as uByte, y as uByte, radius as ... uByte)

REM some bounds and ... : REM out of screen
ELSEIF CAST(uInteger,y)+radius > 192 ... br />
for ydiff=-radius to radius
x1=iSqrt ( rsquared ...

... Amstrad which has page; to clear the screen.

... Y' and exiting the program instead, I've used a more down to ... 60 hits, misses,
70 x, target,
80 inumber : ... /> 410 FOR i:=1 TO x-1 DO
420 ...

...
;fade in the screen display file and ATTRs
;
;plasma ... l,d ;use L to create the SCReen address Hi-byte from the ... x 3
jr c,a2s_l ;
push de ;save ATTRs address ...

... br /> ret z ;RETurn to the address right after EOS
... br /> ld ixl,a ;and x coord
jp no_split3
push de ;save current screen attr addr

... />
pop de ;restore screen attr addr

char_attr1 ...

... :)

Ported from BASIC to asm


[code ... )
LD (DBLXVAR),HL ; x = x1 y = y1
LD A,(DBLNUMPIX ... on the previous plot address
; using INCY and DECY etc.

... -hand side of the screen where X=0 and your line crosses it ... where X is exactly on the border (X=0) and Y is the Y-co ... line segment you got down to. And you trim your original line ... solution to the problem of a digonal line starting and ending off-screen ...

... with two characters for the Y and X values. These characters are a ... the back screen to the real screen.

All the letters and numbers ... larger sprite off-screen. The screen starts at 4,4. And you can ...

... easier to forbid it to enter character positions?
If x=number, number and y ... about the size of the screen and how many characters will fit ... return the size of the screen and TEXTw and TEXTh will return how ...

... machine_current->line_times[ 0 ] ) {
*x = *y = -1;
return;
}
screen area are displayed do is ... chunk that the ULA sends to the display since tick ... border color value is latched and can't be changed ...

... into), so 40 bytes x 4 shifts = 160 bytes.
< ... . You don't need to remember the address of the previous tile ...

DE points to the the address in the display file ... times everytime you render the screen, try and reduce your overheads where ...

Bresenham circle is the way to go in my opinion
... br /> AND A
SUB E ; x - y
SLA A ; 2 * (x - y)

If you want to return to BASIC do a

to the address in SCANNING of the 'end ...

... ZX_AT(int y , int x)

{
int y , yb , x ;
char ... to by screenaddress, read the beginning of screen RAM */
return screenaddress ; /* address ...

So for example if x, y, z is in range 0- ... be drawn at screen position (128, 138) and the shadow would be ... ).

That assumes the Y = 0 is at the bottom ... though but to go from the top left ... (0, 0) you just do y = 256 - y

... ) is bottom left in screen space
p=(x,y,z) // initial position ... they are on screen
// can scale p.x, p.y and p.z ... reflect x & z if you want when they hit screen boundaries ... bit trickier if you want to take into account the time ...

... /> Video and NC connections could be reused to carry additional address likes, ... something like a 5" x 5" x 5" cube, with a ... come with an integrated Flat Screen display built into the ... have been easier and quicker to bring to market and debug, and would have ...

... ; data
; ix[2] -> x coord of cell (0-31 ... )
; ix[3] -> y coord of cell (0-23 ... e, (ix+3) ; e = row (y)
sla e ; e = row ... of screen address
inc hl ; hl points to high byte of screen address

... ; data
; ix[2] -> x coord of cell (0-31 ... )
; ix[3] -> y coord of cell (0-23 ... e, (ix+3) ; e = row (y)
sla e ; e = row ... of screen address
inc hl ; hl points to high byte of screen address

... full screen movement

I changed the WINDOW_ stuff to this ... Y pos (pixels)
WINDOW_BOTTOM EQU 192;-8
; clamp player X to ... row, col, width, height
and have a switch for border ... on/off

and I commented out this near ...

... full screen movement

I changed the WINDOW_ stuff to this ... Y pos (pixels)
WINDOW_BOTTOM EQU 192;-8
; clamp player X to ... row, col, width, height
and have a switch for border ... on/off

and I commented out this near ...

... point it to an off screen buffer and copy that to screen if ... br /> ; clamp player to this minimum Y pos (pixels)
WINDOW_TOP ... br /> ; clamp player to this maximum Y pos (pixels)
... )*8
; clamp player X to this minimum row (character cells ...

... )
at equ 22 ; at y , x (0-255,0-255)
and used to set the correct channel ... anything the ROM routines can and more. The ROM routine supports ... off the edge of the screen (wraps to next line), but I ...