Tilemaps, Datablocks, and Possible Frustrum?

by Jesse Allen · in Torque 2D Beginner · 11/09/2013 (12:35 am) · 51 replies · (edit: Alright, picture is finished. Hope this makes more sense!)

// Just an example, a block template with no real defining features, assume it's 1 square meter in size, and its x and y dimensions are equal
new Sprite(Block)
{
class = Block;
};
//example code for adding in tiles, doesn't add a collsion shape, that's the hard part ;)
function addbrick(%posx, %posy, %type)
{
// making them whole numbers because for a grid, it's sensible enough to do so
%posx = mRound(%posx);
%posy = mRound(%posy);
// this will spawn an object inheriting the values of our previously defined object template
eval("%block = new Sprite(:" @ %type @ ");");
// actually make the co0rdinates mean something
%block.position = %posx, %posy;
//array to store all tiles in the map
$TileArray[%posx, %posy] = %block.class SPC %block; // could be anything stored in here, from a series of flags, to an ordered string containing information about the block's type, state, etc.
// add the brick to the scene
YOURSCENE.add(%block);
}

function directionCheck(%curpos, %lastpos)
{
//moving in the positive direction
if(%curpos > %lastpos)
	return 1;
//Stan-ding-still! Stan-ding-still!
if(%curpos == %lastpos)
	return 0;
//moving in the negative direction
if(%curpos < %lastpos)
	return -1;
}

//this wont work for you completely, but it gets the point across I think.
function Player::Cleanup(%player)
{
// find out the player's approximate coordinates
	%x = mRound(getword(%player.position, 0));
	%y = mRound(getword(%player.position, 1));
//you need to determine where the player is going, so compare their current position to one we sampled previously, I'll say that in this case we store the position of the player at the last check to be stored in a dynamic feild called lastposition
	%lx = getword(%player.lastposition, 0);
	%ly = getword(%player.lastposition, 1);
	%xd = directionCheck(%x, %lx);
	%yd = directionCheck(%y, %ly);
// if they are standing still, we dont need to do all of this, so we can just stop right now.
	if(%xd == 0 && %xy == 0)
		return;
// assuming that the camera makes a 20x world unit square around the player, obviously you'd have to rework this, as this is a pretty small scene...
// x direction first
	for(%i=0; %i<20; %i++)
	{
//the x value we are going to use for added bricks
		%fx = %x + 10(%xd); // 20/2 = 10, 10*(direction) allows us to go either way
// x for deleted's
		%bx = %x - 10(%xd);//same logic as above, but going backwards
//whoa... Ok, this just finds the Handle of the bricks we are deleting and deletes them.
		getword($TileArray[%bx,(%i+(%y-10))], getwordcount($TileArray[%bx,(%i+(%y-10))]) - 1).delete();
//add blocks
		addbrick(%fx, (%i+(%y-10)), getword($TileArray[%fx,(%i+(%y-10))], 0));
	}
//didnt really think this one through as well, but I'm getting tired, and the first one should get the point across just fine, I think.
	for(%i=0; %i<20; %i++)
	{
//the y value we are going to use for added bricks
		%fy = %y + 10(%yd); // 20/2 = 10, 10*(direction) allows us to go either way
// y for deleted's
		%by = %y - 10(%yd);//same logic as above, but going backwards
//whoa... Ok, this just finds the Handle of the bricks we are deleting and deletes them.
		getword($TileArray[(%i+(%x-10)),%by], getwordcount($TileArray[(%i+(%x-10)),%by]) - 1).delete();
//add blocks
		addbrick( (%i+(%x-10)) , %fy , getword($TileArray[(%i+(%x-10)),%fy],0) );
	}
	//Give the player a new last position for next run
	%player.lastposition = %x SPC %y
	//Thank god it's over...
}
//I'm assuming you'll want to have more than one player later, So I'd change this up a bit.
Player.startTimer("Cleanup",100);

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Tilemaps, Datablocks, and Possible Frustrum?

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