actionscript 3 - Calculating column and row number in an isometric rectangular shaped grid -


i'm trying extend isometric flash game based on as3isolib. game support diamond shaped grids have implement possibility have rectangular shaped grids, too. please see example grid.

i managed create grid. here code:

private function createrectangulargrid():void {     var c:int, r:int;     var node:datanode;     var pt:pt;     var nodepos:point;     var isevenrow:boolean;      (c=0; c<cols; c++) {         nodepos = new point(c*_cellsize, -c*_cellsize);         (r=0; r<rows; r++) {             node = new datanode();             node.col = c;             node.row = r;             node.x = nodepos.x;             node.y = nodepos.y;             node.z = z;             node.width = _cellsize;             node.length = _cellsize;             node.height = 0;              pt = new pt(node.x, node.y, node.z);             isomath.isotoscreen(pt);             node.screenx = pt.x;             node.screeny = pt.y;              _nodes.set(c, r, node);              isevenrow = r % 2 == 0;             if (isevenrow) nodepos.x += _cellsize;             else nodepos.y += _cellsize;         }     } }

with cellsize (isometric width , length) of 20px, isometric positions of grid cells shown above are:

  • [datanode (col:0, row:0, x:0, y:0)]
  • [datanode (col:0, row:1, x:20, y:0)]
  • [datanode (col:0, row:2, x:20, y:20)]
  • [datanode (col:0, row:3, x:40, y:20)]
  • [datanode (col:0, row:4, x:40, y:40)]
  • [datanode (col:0, row:5, x:60, y:40)]
  • [datanode (col:0, row:6, x:60, y:60)]
  • [datanode (col:1, row:0, x:20, y:-20)]
  • [datanode (col:1, row:0, x:20, y:-20)]
  • [datanode (col:1, row:1, x:40, y:-20)]
  • [datanode (col:1, row:2, x:40, y:0)]
  • [datanode (col:1, row:3, x:60, y:0)]
  • [datanode (col:1, row:4, x:60, y:20)]
  • [datanode (col:1, row:5, x:80, y:20)]
  • [datanode (col:1, row:6, x:80, y:40)]
  • [datanode (col:2, row:0, x:40, y:-40)]
  • [datanode (col:2, row:1, x:60, y:-40)]
  • [datanode (col:2, row:2, x:60, y:-20)]
  • [datanode (col:2, row:3, x:80, y:-20)]
  • [datanode (col:2, row:4, x:80, y:0)]
  • [datanode (col:2, row:5, x:100, y:0)]
  • [datanode (col:2, row:6, x:100, y:20)]

the problem objects , avatars still placed grid diamond shaped. because formula calculating column , row number based on isometric x/y position working diamond grids:

var isopt:pt = isomath.screentoiso(new pt(avatar.x, avatar.y)); var col:uint = math.floor(isopt.x / cellsize); var row:uint = math.floor(isopt.y / cellsize);

does know how formula should rectangular shaped grid?

i figured out. following method return column , row number of tile lying under isometric x/y position passed parameters. 

public function getnodebyisopos(x:number, y:number):datanode {     var c:uint, r:uint;     if (_shape == staggered_shape) {         // calculates column , row rectangular map (also called staggered map or block map)         c = math.floor((math.floor(x / _cellsize) - math.floor(y / _cellsize)) / 2);         r = math.floor(x / _cellsize) + math.floor(y / _cellsize);     } else {         // calculates column , row diamond map         c = math.floor(x / _cellsize);         r = math.floor(y / _cellsize);     }     return getnode(c, r); }

works perfectly. please let me know if there more elegant way.


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