Script path of bullet

[ladykiller]

I'm trying to script de movement of a bullet with a variable angle, variable wind speed.



this is what I have so far:

// gravity
var hoek1:Number = 90;
var grote1:Number = 8;

//Wind 
var hoek2:Number = 45;
var grote2:Number = 5;

//krachten uitrekenen

var x1:Number = grote1*Math.cos(hoek1*Math.PI/180);
var y1:Number = grote1*Math.sin(hoek1*Math.PI/180);
var x2:Number = grote2*Math.cos(hoek2*Math.PI/180);
var y2:Number = grote2*Math.sin(hoek2*Math.PI/180);

//optellen krachten x
var x:Number = x1+x2;

//optellen krachten y
var y:Number = y1+y2;

I was thinking that you need to put the angle calculation into the formula. I think it should be a parabolic function. But how do I script it and how do I use my forces in it? I't used for a tanks game for pocket pc so the movie is not standard but 240*320


Thanx in advanced

[Nialsh]

Still working on a solution to a problem almost exactly like this. I think the solution lies in solving it in pieces. The combination of all the equations you need looks like this:

V*cos(t) = (a(xs-xf))/(-V*sin(t)+/-sqrt(V^2*sin(t)+2a(ys-yf)))

You really need to isolate t (the angle needed to get from (xs,ys) to (xf,yf) at a given velocity (V) and gravity (a). You could also solve for velocity if you've already determined t.

Good luck
Neal

[tonypa]

You could use something like this:

code:

---

onClipEvent(load){

	angle=-45;

	angle=angle/180*Math.PI;

	speed=40;

	gravity=2;

	wind=-15;

}

onClipEvent(enterFrame){

	xspeed=speed*Math.cos(angle);

	yspeed=speed*Math.sin(angle);

	yspeed+=gravity;

	this._x+=xspeed+wind;

	this._y+=yspeed;

	angle=Math.atan2(yspeed, xspeed);

	speed=Math.sqrt(yspeed*yspeed+xspeed*xspeed);

}

---

Of course the values for speed/angle/gravity/wind should be changed to suit your game.

[Nialsh]

Oh, I guess I didn't read your post entirely. Yeah, tonypa has it right.

Neal

[allme4myjesus]

Originally posted by tonypa

code:

---

angle=angle/180*Math.PI;

---

what is Math.PI?

[tonypa]

Originally posted by allme4myjesus
what is Math.PI?

Pi -
http://en.wikipedia.org/wiki/Pi

It is used in my post to convert between radians and degrees.
Math.PI is constant built into Flash.

[allme4myjesus]

oh, duh, well thanks I needed that