[MX]beggining tile based movement

[Mythmon]

im staring into tile based coding and im trying to make a 8x8 grid with 3 kinds of terrain
0 = empty
1 = blocked
2 = swamp

now i have this code

speed = 4;



function walk (dir) {

	// check dir

	if ( dir == null ) {

		return;

	}

	// where are our edges?

	var downY   = Math.floor( ( _y + (_height/2) ) /_parent.tileH );

	var upY     = Math.floor( ( _y - (_height/2) ) /_parent.tileH );

	var leftX   = Math.floor( ( _x - (_width/2) ) /_parent.tileW );

	var rightX  = Math.floor( ( _x + (_width/2) ) / _parent.tileW );

	var centerX = Math.floor( _x / _parent.tileW );

	var centerY = Math.floor( _y / _parent.tileH );	



	if ( dir == "up" && _parent.myMap[upY][centerX] == 2 ) {

		speed = 2

	} else {

		speed = 4

	}

	if ( dir == "down" && _parent.myMap[downY][centerX] == 2 ) {

		speed = 2

	} else {

		speed = 4

	}

	if ( dir == "left" && _parent.myMap[centerY][leftX] == 2 ) {

		speed = 2

	} else {

		speed = 4

	}

	if ( dir == "right" && _parent.myMap[centerY][rightX] == 2 ) {

		speed = 2

	} else {

		speed = 4

	}

	

	if ( dir == "up" && _parent.myMap[upY][centerX] != 1 ) {

		_y -= speed;

	}

	if ( dir == "down" && _parent.myMap[downY][centerX] != 1 ) {

		_y += speed;

	}

	if ( dir == "left" && _parent.myMap[centerY][leftX] != 1 ) {

		_x -= speed;

	}

	if ( dir == "right" && _parent.myMap[centerY][rightX] != 1 ) {

		_x += speed;

	}

}

which, if i right reduce speed t 2 if going through swamp and increase to 4 if not, but it will only work if i go right (this is not all my script but its all thats important.)

can any one help me?

[blah-de-blah]

which, if i right reduce speed t 2 if going through swamp and increase to 4 if not,

what do you mean by this part?? And is this like a game thing you're trying to make, like making a guy walk?

[.:®:.]

hey there,

If you want the lowdown of tile based gaming, this guy Klas Kroon has some fantastic knowledge to share.

People may remember him from Jail*****.....

http://outsideofsociety.idz.net/

hope it helps.

[Mythmon]

im basically using the jail***** tutorial code all i addded was the code to decrease speed if entering a swamp land but it wont work