Topic: Isometric projection in Flash.

// transforms x,y,z coordinates into Flash x coordinate
xFla = function (x, y, z) {
  // cartesian coordinates
  xCart = (x-z)*Math.cos(0.46365);
  // flash coordinates
  xI = xCart+xOrigin;
  return (xI);
};
 
// transforms x,y,z coordinates into Flash y coordinate
yFla = function (x, y, z) {
  // cartesian coordinates
  yCart = y+(x+z)*Math.sin(0.46365);
  // flash coordinates
  yI = -yCart+yOrigin;
  return (yI);
};

// Slightly altered versions of the previous functions:
// transforms x,y,z coordinates into Flash x coordinate
xFla = function (x, y, z) {
	// cartesian coordinates
	xCart = (x-z)*Math.cos(0.46365);
	// flash coordinates
	xI = xCart;
	return (xI);
};
// transforms x,y,z coordinates into Flash y coordinate
yFla = function (x, y, z) {
	// cartesian coordinates
	yCart = y+(x+z)*Math.sin(0.46365);
	// flash coordinates
	yI = -yCart;
	return (yI);
};
// Let's say function blah() is here...
// Usage: blah ( point_X , point_Y , altitude )

ix = 12;
iy = 5;
iz = 23;

fx = xFla(ix,iy,iz);
fy = yFla(ix,iy,iz);
trace("fx = "+fx+" | fy = "+fy);
// output: fx = -9.83868733881014 | fy = -20.652550692568

n = blah(fx,fy,iy);
trace("x = "+n[0]+" | y = "+n[1]+" | z = "+n[2]);
// output: x = 12 | y = 5 | z = 23

z = 23; //constant...
xBlah = function (x, y) {

	x = (xCart + z * Math.cos(0.46365) ) / Math.cos(0.46365)
	return (x);
};
// transforms x,y,z coordinates into Flash y coordinate
yBlah = function (xCart, yCart) {
	// cartesian coordinates
	y = yCart-(xCart+z)*Math.sin(0.46365);
	return (-y);
};

// --- Functions ---
// Convert isometric coordinates to Flash X coordinate
xFla = function (x, y, z) {
	return ((x-z)*isoCos);
};
// Convert isometric coordinates to Flash Y coordinate
yFla = function (x, y, z) {
	return (-(y+(x+z)*isoSin));
};
// Convert Flash X and Y and altitude coordinates to isometric X coordinate
xIso = function (xF, yF, y) {
	return ((xF)/isoCos-(yF+y)/isoSin)/2;
};
// Convert Flash X and Y and altitude coordinates to isometric Y coordinate (actually Z, but I don't give a hoot)
yIso = function (xF, yF, y) {
	return (-((xF)/isoCos+(yF+y)/isoSin))/2;
};

// --- Variables ---
// isoCos and isoSin are defined in variables so they don't have to be calculated every time the functions are executed
isoCos = Math.cos(0.46365);
isoSin = Math.sin(0.46365);

// --- Example Use ---
// This example shows mostly why I wanted the new functions

isoWorld_mc.onMouseUp = function() {

	// Let's put _xmouse and _ymouse into isometric coordinates
	isoMouseX = xIso(_xmouse, _ymouse, 0);
	isoMouseY = yIso(_xmouse, _ymouse, 0);

	// Let's round it to the nearest 100
	isoMouseSnapX = Math.round(isoMouseX/100)*100;
	isoMouseSnapY = Math.round(isoMousey/100)*100;

	// Let's convert them back to Flash coordinates
	flaMouseX = xFla(isoMouseSnapX, 0, isoMouseSnapY);
	flaMouseY = yFla(isoMouseSnapX, 0, isoMouseSnapY);

	// Now, let's change the position of this sucker
	this._x -= flaMouseX;
	this._y -= flaMouseY;

};