koobas.hobune.stream
Change GameObject According to UI selection
Hey! I am currently working on a racing game and sitting at at the car selection screen. here is my current code:
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class SlotSelector : MonoBehaviour {
public RectTransform navigator1;
int nav1Pos = 0;
public RectTransform navigator2;
int nav2Pos = 0;
public RectTransform[] slots = new RectTransform[12];
public int jumpAmount = 4;
public Text textShowNav1;
public Text textShowNav2;
void Start(){
MoveNav1(0);
MoveNav2(0);
}
void Update () {
// move up
if(Input.GetKeyDown(KeyCode.W)){
MoveNav1(-jumpAmount);
}
if(Input.GetKeyDown(KeyCode.UpArrow)){
MoveNav2(-jumpAmount);
}
if(Input.GetKeyDown(KeyCode.A)){
MoveNav1(-1);
}
if(Input.GetKeyDown(KeyCode.LeftArrow)){
MoveNav2(-1);
}
if(Input.GetKeyDown(KeyCode.S)){
MoveNav1(jumpAmount);
}
if(Input.GetKeyDown(KeyCode.DownArrow)){
MoveNav2(jumpAmount);
}
if(Input.GetKeyDown(KeyCode.D)){
MoveNav1(1);
}
if(Input.GetKeyDown(KeyCode.RightArrow)){
MoveNav2(1);
}
}
void MoveNav1(int change){
if(change > 0){
if(nav1Pos+change < slots.Length-1){
nav1Pos += change;
}else{
nav1Pos = slots.Length-1;
}
}else{
if(nav1Pos+change >= 0){
nav1Pos += change;
}else{
nav1Pos = 0;
}
}
navigator1.position = slots[nav1Pos].position;
textShowNav1.text = "Nav 1 is at slot "+ nav1Pos;
}
void MoveNav2(int change){
if(change > 0){
if(nav2Pos+change < slots.Length-1){
nav2Pos += change;
}else{
nav2Pos = slots.Length-1;
}
}else{
if(nav2Pos+change >= 0){
nav2Pos += change;
}else{
nav2Pos = 0;
}
}
navigator2.position = slots[nav2Pos].position;
textShowNav2.text = "Nav 2 is at slot "+ nav2Pos;
}
}
which looks in game like this: .. cant upload gif, so here a direct link: http://www.gfycat.com/FlimsyHonorableGentoopenguin
what i want to do now is, that, every time i switch to another slot and press the Enter Key, the Car on the left (the pizza wagon) changes to another Car prefab. do you guys have an idea how i can do this? Thanks!
You will need to add the following code to your current class to do it,
void Update () {
//... all ur existing code
if( /*<enter is pressed condition>*/ ){
selectNav1(nav1Pos);
}
}
public Transform[] cars; // all 12 cars meant to be shown, can be set from inspector
public Transform displayAt; // the position where the car is supposed to be displayed
public Transform selectedCar;// the car which is currently being displayed
void selectNav1(int nav1Pos){
selectedCar.gameObject.SetActive(false); //deactivate the previously selected car
selectedCar = cars[nav1Pos]; // assign the selected car
selectedCar.position = displayAt.position; //move it to correct position
selectedCar.gameObject.SetActive(true); // set the car active
}
will come back later to add more details
hey! thanks for the detailed answer! somehow this:
public Transform cars[]; // all 12 cars meant to be shown,
is causing troubles
syntax error, bad array declarator. To declare a managed array the rank specifier precedes the variable's identifier. To declare a fixed size buffer field, use the fixed keyword before the field type
should be someting like this right?
public Transform[] cars = new Transform[12];
but then it marks me the
selectedCar.setActive(false);
as wrong
In your SlotSelector script, add a reference to a placeholder prefab that will display the car. ex. public GameObject blee; Drag CarDisplay prefab onto the variable in editor.
When you move, call a script that has either an id or a model to display: blee.GetComponent<CarDisplay>().changeCar(int id); or something like that. Cheers
[edit] It seems you are already doing exactly that and I misunderstood what you where looking for. Use an empty prefab, that spawns or destroys objects when you change cars. Here is a pseudo code for you, I did not test this but it should give you a very clear idea of what I mean:
// Also holds cars in an array of GameObjects
GameObject selectedCar;
void changeCar(int id) {
// Remove previously selected car
Destroy(selectedCar);
// Create object
selectedCar = Instantiate(myCars[id], new Vector3(0,0,0), Quaternion.identity) as GameObject;
}
More info: http://docs.unity3d.com/ScriptReference/Object.Instantiate.html and: http://docs.unity3d.com/ScriptReference/Object.Destroy.html
IIRC, the gameObject may be destroyed at the next frame. So you might want to either use LateUpdate for spawning with some toggle, or use a coroutine to similar effect.
