Scratch

Use this block

if on edge, bounce

when gf clicked
forever
if <up key pressed>
  change y by (1)
if <touching [maze v]>
change y by (-1)
end
end
if <down key pressed>
  change y by (-1)
if <touching [maze v]>
change y by (1)
end
end
if <right key pressed>
  change x by (1)
if <touching [maze v]>
change x by (-1)
end
end
if <left key pressed>
  change x by (-1)
if <touching [maze v]>
change x by (1)
end
end
end

Last edited by pipercubjl (2012-06-26 16:47:50)

pipercubjl wrote:

when gf clicked
forever
if <key [up arrow v] pressed?>
  change y by (1)
if <touching [maze v]?>
change y by (-1)
end
end
if <key [down arrow v] pressed?>
  change y by (-1)
if <touching [maze v]?>
change y by (1)
end
end
if <key [right arrow v] pressed?>
change x by (1)
if <touching [maze v]?>
change x by (-1)
end
end
if <key [left arrow v] pressed?>
  change x by (-1)
if <touching [maze v]?>
change x by (1)
end
end
end

Fixed blocks.

If you want velocity:

when gf clicked
set [x-vel v] to (0)
set [y-vel v] to (0)
set [accel v] to [whatever number you want]
forever
if<key [up arrow v] pressed?>
change [y-vel v] by (accel)
end
if<key [down arrow v] pressed?>
change [y-vel v] by ((-1)*(accel))
end
if<key [right arrow v] pressed?>
change [x-vel v] by (accel)
end
if<key [left arrow v] pressed?>
change [x-vel v] by ((-1)*(accel))
end
set [x-vel v] to ((0.98)*(x-vel))
set [y-vel v] to ((0.98)*(y-vel))
change x by (x-vel)
if<touching [wall v]?>
change x by ((-1)*(x-vel))
set [x-vel v] to ((-0.5)*(x-vel))
end
change y by (y-vel)
if<touching [wall v]?>
change y by ((-1)*(y-vel))
set [y-vel v] to ((-0.5)*(y-vel))
end

fg123 wrote:

Overly complicated.    He wants the code for bouncing off walls diagonally, not velocity and movement. 

Like pong?  Because the easiest way to have accurate collision like that is the script below.  90 degree walls are nice because the absolute value of the x and y velocities are always constant.

A lot of users simply turn the sprite 180 degrees though, which isn't accurate collision.  It's easier to simply avoid angles all together and use x and y velocities.

when gf clicked
forever
change x by (x-speed)
if<touching [wall v]?>
set [x-speed v] to ((-1)*(x-speed))
change x by (x-speed)
end
change y by (y-speed)
if<touching [wall v]?>
set [y-speed v] to ((-1)*(y-speed))
change y by (y-speed)
end

Last edited by MoreGamesNow (2012-06-27 09:26:29)