Wall Help

[Boiq]

Okay, i'm currently working on a game programmed by Turing.

I recently added some basic graphic walls using 'drawfillbox'. I have an animated object that is being controll, so how would I make it so when it runs into the wall it stops rather then going through it.

All help would be appreciated to guide me onto the right path, thanks.

[Tony]

Figure out where the wall is.

On paper. With math.

You already have the numbers -- you are using them to draw the wall in the first place. Although it might be easier to exploit arrays (think tiles) and write a general solution once than having to hard-code every block location (that gets messy).


(not really a wall, but it's semi-relevant)

[Insectoid]

Sorry, tony, I know you love paper and math, but I can't help but give a link of my own.

Tutorial!

[S_Grimm]

if y location of box is greater than y location of top wall, then y := y -1

[Warchamp7]

A\V @ Mon Sep 08, 2008 10:36 am wrote:

if y location of box is greater than y location of top wall, then y := y -1

1. He's talking about blocks not a roof

2. That wouldn't work if he moves more than 1 pixel every loop which is likely unless that loop is 1


Collisions in turing are not a simple task if you're still getting your bearings. You'll need to have collision checks between the object you control and anything that can restrict it's movement. Now if you only had two objects it's not too difficult but with more it becomes a little more daunting.

Unless you know how to use arrays effectively it won't be fun tracking multiple collisions : /

[Boiq]

Okay, i'm starting to understand a bit.

And yes i'm talking about a collosion with the walls. Isn't it kinda binary, like 0's for path, 1's for walls, 2 for your character, etc?

[Warchamp7]

If you used a tile system yes

[S_Grimm]

This is whant you want to do right?
sorry asbout the rough code. I need to fix the top and right boundries

code:

var x, y : int := 30 %starting position of box var x1, y1 : int := 40 var move := 5 %change this variable to change movement var key : array char of boolean procedure bound     if (x >= 300) then         x := x - move         x1 := x1 - move     end if     if x <= 20 then         x := x + move         x1 := x1 + move     end if     if (y >= 300) then         y := y - move         y1 := y1 - move     end if     if y <= 20 then         y := y + move         y1 := y1 + move     end if end bound procedure movement     Input.KeyDown (key)     if key (KEY_UP_ARROW) then         y := y + move         y1 := y1 + move     end if     if key (KEY_RIGHT_ARROW) then         x := x + move         x1 := x1 + move     end if     if key (KEY_LEFT_ARROW) then         x := x - move         x1 := x1 - move     end if     if key (KEY_DOWN_ARROW) then         y := y - move         y1 := y1 - move     end if end movement View.Set ("offscreenonly") loop Draw.FillBox (20, 20, 300, 300, black)     Draw.FillBox (x, y, x1, y1, red)     bound     movement        View.Update end loop

[Warchamp7]

If he's doing a top down then that seems right, though once again you're just doing outer boundaries.

I think he's looking for collisions with a block.

So for example using your rough code


Creating collisions with the white areas

[Insectoid]

Outer boundaries? That's what you wanted? That's easy.

In pseudocode,

if the right button is pressed and the X value is less then maxx, incease X by 1.

[S_Grimm]

ok so you want the code to look like :
if x location of figure = right edge of box, then x := x - movement pixels
end if
for a specific size of box where you need to go over it also:
if x location of figure is = right edge of box and y location of figure is >= bottom of box and y location <= top of box then
x := x - movement pixels
end if

[Warchamp7]

A\V @ Tue Sep 09, 2008 6:41 pm wrote:

ok so you want the code to look like :
if x location of figure = right edge of box, then x := x - movement pixels
end if
for a specific size of box where you need to go over it also:
if x location of figure is = right edge of box and y location of figure is >= bottom of box and y location <= top of box then
x := x - movement pixels
end if

If I read that right, you just made the character only move if it's INSIDE the box touching the right side of it.

[S_Grimm]

Warchamp, Here is an example of the conde. you cannot move the red box through the side of the white box. (you can still move through the top and bottom though. i wrote this really fast.

Turing:

setscreen ("offscreenonly") var x1, y1 : int := 300 var x2, y2 : int := 320 var key : array char of boolean var movement : int := 1 procedure bound if x1 +20 = 50 and y2 -20 <= 200 and y2 >= 50 then %account for the box's size, offset the variable by size of the box x1 := x1 - movement x2 := x2 - movement end if if x1 = 150 and y1 <= 200 and y1 >= 50 then x1 := x1 + movement x2 := x2 + movement end if end bound loop View.Update Draw.FillBox (0, 0, maxx, maxy, black) Draw.FillBox (50, 50, 150, 200, white) Draw.FillBox (x1,y1,x2,y2, red)     Input.KeyDown (key)     if key (KEY_UP_ARROW) then         y1 := y1 + movement         y2 := y2 + movement     end if     if key (KEY_RIGHT_ARROW) then         x1 := x1 + movement         x2 := x2 + movement     end if     if key (KEY_LEFT_ARROW) then         x1 := x1 - movement         x2 := x2 - movement     end if     if key (KEY_DOWN_ARROW) then         y1 := y1 - movement         y2 := y2 - movement     end if bound end loop

[Warchamp7]

Quote:

if x location of figure is = right edge of box and y location of figure is >= bottom of box and y location <= top of box then
x := x - movement pixels

code:

if x1 + 20 = 50 and y2 -20 <= 200 and y2 >= 50 then

As I pretty much said, this only works if he is perfectly at 50.

What happens if the speed is 4? It's good to make an area to check for collisions. A literal hitbox.

[isaiahk9]

One of the easiest ways I've found is just like this :

if the user clicks "move right" and characterx < x coordinate of the right side of the wall and character x > x coordinate of the left side then

the character can move any direction

else

the character can only move left.

Kind of confusing the way I wrote it, but basically your character cannot go in the area that is designated wall.