Isometric
Transformations - IV
by
Danko Kozar : 18 November 2004
Let's move! We need an object, some controls, and our
transformation equations.
step=2;
// --- initialization of the
object-------------------
init=function
(){
this.attachMovie("box",
"character",
1000);
};
init();
// --- main
------------------------------------------
character.onEnterFrame=
function(){
this.x+=
this.dirx*step;
this.y+=
this.diry*step;
this.z+=
this.dirz*step;
if(this.x<0){
this.x=
0;
}
if(this.y<0){
this.y=
0;
}
if(this.z<0){
this.z=
0;
}
this._x=xFla(this.x,
this.y,
this.z);
this._y=yFla(this.x,
this.y,
this.z);
};
The object is a movie clip attached from a library. We name
it's instance a "character" and give it some level (1000) - this
is done with init() function.
The buttons are changing the values of X, Y and Z isometric
coordinates. They set dirx,
diry and dirz
properties of the character to values -1,
0 and 1,
using the following action (this is the action added to +X
button):
on(press){
_root.character.dirx=1;
}
on(release,
releaseOutside){
_root.character.dirx=0;
}
In the main program loop isometric coordinates are being
transformed into plain screen coordinates and the
_x and _y
properties of the object are set.
[ moving objects in isometric:
press the gray buttons above
]
In the next tutorial I'll explain performing hit tests
without a hitTest function, because
obviously we cannot use it for hit testing in isometric
projection.
Recommendation
If you like to explore the theory of arcade
games, I recommend an excellent
Tile based games tutorial.
Isometric
Transformations - IV
