Scratch

change x by (10)
change y by (10)

Let me help:

when gf clicked
forever
 if <touching [line v]?>
  change x by (1)
  change y by (1)
 else
  change y by (-1)//[Or whatever you use for gravity.]
 end

I hope that this helps!

Last edited by ErnieParke (2012-08-03 12:00:34)

*epiphany*

Ernie your suggestion worked once I started over and built the logic around your code example.

Thanks!

I believe you are looking for slope detection, which is a very valuable skill when making a platformer. I'm really surprised that the wiki has no article on it.

Basically you want something like this:

forever
 if <key [right arrow v] pressed?>
  change x by (2)
  if <touching [ground v]?>
   change y by (4)
   if <touching [ground v]?>
    change y by (-4)
   else
    change y by (-2)
   end
  end
 end
end

For your sensor, you'll need to follow these steps:

1). Pick five different colors.

2). Find and copy the sprite that you want the sensor for.

3). Go and edit the 2nd copied sprite.

4). While in paint editor, use four of the five colors to create a box around the sprite. Use one color per side, and leave out the corners. Also, make the box's lines several pixels thick.

5). Pick your 5th color and make a line below, but touching, the bottom side of the box.
An example of this type of sensor can be viewed in The Dangerous Adventure, which I created to help shrey15 with sensing and moving platforms.

6). Delete everything except for the lines you had drawn earlier.

Now, put this script in the sensor:

When gf clicked
hide//Or you can use [set [ghost effect v] to (100)].
forever
 go to [tennis ball v]
 if < color [ ] is touching color [black]?>// Color of the top part of the box.
  set [up v] to (0)
 else
  set [up v] to (1)
 end
 if < color [ ] is touching color [black]?>// Color of the left part of the box.
  set [left v] to (0)
 else
  set [left v] to (1)
 end
 if < color [ ] is touching color [black]?>// Color of the right part of the box.
  set [right v] to (0)
 else
  set [right v] to (1)
 end
 if < color [ ] is touching color [black]?>// Color of the 2nd to bottom line of box.
  set [down 1 v] to (0)
 else
  set [down 1 v] to (1)
 end
 if < color [ ] is touching color [black]?>// Color of the bottom line of the box.
  set [down 2 v] to (0)
 else
  set [down 2 v] to (1)
 end

Some of the comments kept on getting cut off, so I had to shorten them considerably.

Anyway, add this to the tennis ball:

when gf clicked
forever
 if <<key [up arrow v] pressed?> and <<(up) = (1)> and <(down 2) = (0)>>>
  Whatever script you use to jump.
 end
 if <(down 2) = (1)>
  change y by (-1)
 end

when gf clicked
forever
 if <(down 1) = (0)>
  change y by (1)
 end
 if <<key [left arrow v] pressed?> and <(left) = (1)>>
  change x by (-1)
 end
 if <<key [right arrow v] pressed?> and <(right) = (1)>>
  change x by (1)
 end

The comments on the script don't seem to be appearing, so here they are:
The first if is for jumping, the second if is for moving up slopes and not falling through moving platforms, the third if is for moving left, and the fourth if is for moving left. The fifth is for gravity.

I hope that this helps to improve your game!

Last edited by ErnieParke (2012-08-05 13:22:38)