Space Game

[Er1c]

I am planning on making a completely space-based game (like Cosmic Rift or Starship Troopers (Cosmic Rift is going P2P and Starship Troopers went out of business)), but I really can't think of a way to make the movement work correctly with my limited math knowledge. I'll attach a level with what I have of the movement system so far, and also paste the code below.

NPC Code:

---

//#CLIENTSIDE

if (created) {

  disabledefmovement;

  showstats 0;

  this.speed = 0;

  this.dir   = 0;

}

if (playerenters || timeout) {

//all

  PI = 3.1415926535897932384626433832795;

  this.rotatespeed      = 0.1;

//normal

  this.maxspeed         = 1;

  this.thrustspeed      = 0.05;

  this.turnspeed        = 0.07;

//hyper

  this.hypermaxspeed    = 1.3;

  this.hyperthrustspeed = 0.1;

  this.hyperturnspeed   = 0.02;



  if (keydown(1))

    this.dir = (this.dir+this.rotatespeed)%(PI*2);

  if (keydown(3))

    this.dir = (this.dir-this.rotatespeed)%(PI*2);



  if (keydown(0) || keydown(2)) {

    newspeed = this.speed+this.thrustspeed*(keydown(0)-keydown(2));

    if (newspeed in <this.maxspeed*-1,this.maxspeed>) {

      this.speed = newspeed;

    }

    this.angle = this.dir;

  }

  playerx += sin(this.angle)*this.speed;

  playery += cos(this.angle)*this.speed;

  for (i = 0;i<3;i++) {

    showimg 200+i,@tempus sans itc@c@.,playerx+sin(this.dir)*(i*2),playery+cos(th  is.dir)*(i*2);

    changeimgcolors 200+i,0,0,2,.99;

    changeimgvis 200+i,3;

  }

temp();

  timeout = .05;

}

function temp() {

  if (keydown(5)) this.dir = (this.dir+PI)%(PI*2);

  showimg 0,@#v(sin(this.angle)),10,50;

  showimg 1,@#v(sin(this.dir)),10,70;

  showimg 2,@#v(cos(this.angle)),10,90;

  showimg 3,@#v(cos(this.dir)),10,110;

  for (i = 0;i<50;i++)

    changeimgvis i,4;

}

---

[RavenTelvecho]

looks neat but i dont know what it does lol
feels like a plane

[Gohan43331]

Wow...looks awsome...

Not sure what you mean by moving "correctly"... Seems to work pretty well for me...

[Gohan43331]

Ah, i see what you mean now...where you can change direction instantly...

[Kadar]

Originally posted by Gohan43331
Ah, i see what you mean now...where you can change direction instantly...

No.
Go play cosmic rift and u will see
Its hard to explain.

[prozac424242]

very nice, now to jsut add a ship image sprite rotaded liek every 5 degrees and a changeimgpart and have it work in mulitple levels... heh i like to hold right and up to fly in circles heh

[adam]

Perhaps I should try my hand at the Asteroids game I was working on again.


I felt it was quite nice. Especially since I had never had trig.
But im in trig class now.
We did vectors last week. Me likes.

And I finally understand the proper use of arcTan
I loves it. Very useful. I recall seeing it used and being baffled.
I am now knowing how to be using it.

[adam]

Anytime you need an angle =/ arctan is there. I didn't even know it returned an angle until a few weeks ago.


It's been a while but I remember wanting to figure out an angle and not knowing exactly how I was gonna do that. I prabably did way more than I needed to. arcTan would make it faster.

[adam]

Well say you wanted to make a compas for some odd reason? =/

Trivial things I guess. Hey it could happen.
I remember somebody once saying something like.
"You almost never need to use arrays"
hah. what a statement.

[adam]

=/ Ok so Im just crazy. gimmie a break.
We can live without angles I guess.

[adam]

Originally posted by Kaimetsu
Actually, you're kinda right. I just realised that Graal's rotation function uses angles instead of transformation matrices. I suppose Stefan wanted to make it easier for us kiddies :-/

Graal has a rotation function?
What is a transformation matrices. haha. I know graphing my transformation and I kinda know finding determinants with matrices. but that it.

[Er1c]

Originally posted by Kaimetsu
The movement is dependent on the heading rather than the general velocity. Maybe I should just fix it to show you.

Could you please? It's really just this part that needs to be fixed (well, more like changed... it's not broken, but it isn't working how I want):

NPC Code:

---

    newspeed = this.speed+this.thrustspeed*(keydown(0)-keydown(2));

    if (newspeed in <this.maxspeed*-1,this.maxspeed> ) {

      this.speed = newspeed;

    }

    this.angle = this.dir;

---

this.speed would be the velocity, and this.angle should be the heading. The heading should be determined by the direction and the velocity... but I'm not into math enough to do this.

I have done something like this, but instead of using a direction, I just had a x and y speed, which would be added to as keys were held, but using angles would make other things work much more efficently -- so, if someone (*looks at Kaimetsu*, lol) can help me out here, please do.

[BocoC]

Originally posted by adam


Graal has a rotation function?
What is a transformation matrices. haha. I know graphing my transformation and I kinda know finding determinants with matrices. but that it.

Transformation matrices are mainly used in 3D Programming, like with Direct3D. I wouldn't worry about them if I were you.

[Slaktmaster]

newx = x+sin(angle)*velocity;

Could that work?

[adam]

Originally posted by Kaimetsu


<DELETED ALL PROOFS>

Silly Kai. he was answering a question for me. Dun worry bout it.