I copy a large piece of grahx into the screen.
NX=50
NY=50
DX=240
DY=100
Dpage=0

Then you see in page 0 from (240,100)-(255,149) this piece of graphx.
So basically the NX of the copied graphx is 15 instead of 50.

Now what happened to the other half of the copied graphx ????

it is simply lost

thats pretty handy actually
would be cool if that could also work on the left side of screen



or in the top.

When I copy a big piece of grapx to page 0 at (almost) the bottom of the screen,
then the other half of the grapx gets pasted to page 1

thats not always handy

to have the clip effect on the left
change the copy direction for the X coordinate

in this way you need to specify the top-rigth corner of the box
and you clipped the area that goes outside the left border of the screen

cool !!

great tip man.

Does this work with $D0, $90, $98, $C0 copies ????

What about the top and bottom border, any cool tricks there?

Quote:

Does this work with $D0, $90, $98, $C0 copies ????

it should work in any copy mode,
but do some trials to test the speed
i am not sure about the fact you get
all the time the same copy speed

if I am rigth you should consider to do some math
and implement the clipping by yourself

Quote:

What about the top and bottom border, any cool tricks there?

AFAIK there is no way for up/down borders, here you need to do
some math and implement clipping for the up/down borders by yourself

Quote:

Does this work with $D0, $90, $98, $C0 copies ????

if the doc says so, it most likely does... why would they document something it can't do?

I remember copying somthing in basic. A large (overlapping) area copied 16 pixels to the
right and it was a lot slower than copying to the left.
So my question is how does basic handle such copies? Does it filip the copy direction or not?