koobas.hobune.stream
Tube Shooter Movement Design Help
So I'm making a 2D "Tube Shooter". If you're not sure what that is look up Gyruss. I'm having a bit of a problem with my implementation of the circular pattern of movement.
I've decided to implement the movement using a combination of rotation and translation functions. This makes the ship appear like it is moving in a circular pattern while keeping the front of the ship pointed to the center. I feel like I may be taking the hard road here in implementation of this feature of the game. Here is my code for control.
using UnityEngine;
using System.Collections;
public class PlayerControl : ShipClass
{
public Transform shotStart;
public PlayerShot shot;
void FixedUpdate ()
{
//Movement Control
int xAxisValue = (int) Input.GetAxis ("Horizontal");
int yAxisValue = (int) Input.GetAxis ("Vertical");
switch(xAxisValue)
{
case 1:
transform.Rotate (0, 0, p_rotateSpeed);
transform.Translate (1 * p_Speed * Time.deltaTime, 0, 0);
break;
case -1:
transform.Translate (-1 * p_Speed * Time.deltaTime, 0, 0);
transform.Rotate (0, 0, -p_rotateSpeed);
break;
default:
break;
}
//Y axis isn't implemented currently as I'm just testing out moving left and right.
switch(yAxisValue)
{
case 1:
transform.Translate (0, -1 * p_Speed * Time.deltaTime, 0);
break;
case -1:
transform.Translate (0, 1 * p_Speed * Time.deltaTime, 0);
break;
default:
break;
}
//Firing mechanism
/*
if (Input.GetButtonDown ("Fire2"))
{
Debug.Log ("Fire2 pressed!");
Instantiate(shot, shotStart.position, shotStart.rotation);
}
/*
/*
*
* Debug Purposes
*
*
if(Input.GetKey("a"))
transform.Translate (-1 * player.p_Speed * Time.deltaTime, 0, 0);
if (Input.GetKey ("d"))
transform.Translate (1 * player.p_Speed * Time.deltaTime, 0, 0);
if (Input.GetKey ("s"))
transform.Translate (0, -1 * player.p_Speed * Time.deltaTime, 0);
if (Input.GetKey ("w"))
transform.Translate (0, 1 * player.p_Speed * Time.deltaTime, 0);
Debug.Log (Input.GetAxis ("Vertical"));
*/
}
}
My problem comes from the way the ship moves. It doesn't move in a perfect circle. More specifically when the ship moves from its starting position to the top of the screen it has shifted slightly on the X axis when I want it to end up in the same position just a direct inverse of the Y starting position.
Here are my questions. Is there a better way to implement this? If not is there something I'm missing that makes the ship act like this?
You should check into Transform.RotateAround(). If you have the camera with rotation (0,0,0) and position (0,0,x), getting Gyruss type functionality is as simple as:
using UnityEngine;
using System.Collections;
public class Control : MonoBehaviour {
public float rotateSpeed = 8.0f;
void FixedUpdate() {
transform.RotateAround(Vector3.zero, Vector3.forward, rotateSpeed * Input.GetAxis ("Horizontal"));
}
}
You could also do the rotation in Update() instead of FixedUpdate() and scale the rotation by Time.deltaTime.
Hey you know what I hadn't thought about rotating around the center object. Someone else suggested using FixedUpdate() over Update() because of the 2D collision. Is there a huge difference? Thanks you've been a huge help!
No huge difference, though it may not buy you any help with the collisions.
http://answers.unity3d.com/questions/10993/whats-the-difference-between-update-and-fixedupdat.html
