2D side scroller

Unity Engine
1

hello guys , i am new to the world of unity programming , as i am new to programmation , and i was planning to create a small 2D game , but i already have a problem :

so i a am using 2D toolkit pakage alsow ; i have an animated sprit as my main character wich i was aiming to controle (make him slide left and right on the X axis) , with the arrow keys via a script a wrote, the sprit plays a small animation called idle at the start , and i wanted to be able to switch the idle animation with a walking animation as the spriit goes left or rigth… here is the very humble code i managed to produce :

using UnityEngine;
using System.Collections;

public class changeanim : MonoBehaviour {

tk2dSpriteAnimator animator;

public float moveSpeed = 10f;

// Use this for initialization
void Start () {
animator = GetComponent();

}

// Update is called once per frame
void Update () {

if(Input.GetKey(KeyCode.LeftArrow)){
transform.Translate(Vector3.left * moveSpeed * Time.deltaTime);
animator.Play (“joewalk”);}

if(Input.GetKey(KeyCode.RightArrow)){
transform.Translate(Vector3.right * moveSpeed * Time.deltaTime);
transform.Rotate(Vector3.Scale); }

}

}

so with that i am able to displace the main character along the X axis (left and right) and play a walk animation when he goes left , but i have 2 problemes !!

the first is that when the left walk animation(“joewalk”) is played , i get stuck with the walk animation , it dont go back to the idle animation !

and the second problem is that when i go to the left my character is facing left , cause thats how he starts , but i want him to face to the right when i click the rigth arrow and i dont know how to do that

please help me if you know the solution , i am here pulling my hair for 3 hours with that :-[

2

So I don’t see anything that says to play the idle animation again.

I would set the animations to loop and then run the animation clips like so, in your Update():

if (Input.GetKeyDown(KeyCode.LeftArrow) || Input.GetKeyDown(KeyCode.RightArrow)) {
    animator.Play("joewalk");
}

if (Input.GetKeyUp(KeyCode.LeftArrow) || Input.GetKeyUp(KeyCode.RightArrow)) {
    animator.Play("joeidle"); // Back to idle animation
}

Now this will probably cause bugs if the player is hitting LeftArrow and RightArrow simultaneously, but it should be enough to get you started.

3

For making your character face left and right. I would make a function like this:

void UpdateFaceLeftRight() {
    if (Input.GetKey(KeyCode.RightArrow)) {
        transform.localScale = new Vector3(-1, 1, 1); // Flips transform left-to-right
    }
    else {
        transform.localScale = Vector3.one; // Flips back to normal
    }
}

Again, there will be bugs if the player can press LeftArrow and RightArrow simultaneously. Handling that takes a bit more thought.

4

thank you sooooooooo much garth i really appreciate your help !!! your answer completely solved the problem , i am really happy to see that someone that i absolutely dont know, was fully ready to offer some of his time to help me save up a lot of mine ! since your help i have made a lot of progress ,
and again i am really greatfull that you offered your help ! when i will finish the game , if you accept, i will show it to you so that you see the fruit of your participation , and i dont think there is such thing as a small participation :slight_smile:

5

You can avoid the bug Garth mentions by seperating the animation logic from the input logic. Here’s what I usually do for character controllers.

declare a global Vector 3 speed variable and edit this in your input code.
i.e.

If (Input.GetKey(KeyCode.RightArow)){
    speed.x = moveSpeed;
}
else if(Input.GetKey(KeyCode.LeftArrow)){
    speed.x = moveSpeed * -1;
}
else{
    speed.x = 0;
}transform.translate(speed*Time.deltatime);

Then play the correct animation based on the value of speed.x like

if(speed.x>0){
    transform.localScale = Vector3.one;
    animation.Play("joewalk");
}
else if(speed.x>0){
    new Vector3(-1, 1, 1);
    animation.Play("joewalk");
}
else{
    animation.Play("joeidle");
}

this way you don’t run into issues with strange input combinations and your character will always have the correct animation for the direction he is moving.

NOTE: to flip your character left and right you can use a built in tk2dSprite function from 2dToolkit instead of modifying the scale of the transform… I can’t think of the exact function off the top of my head.

6

thanks a lot man the game is on the google play store as of now , and i owe it to you and to all the guys that helped me here ! i hope to have the chance to give back to the community somehow , the name of the game is Z-Fury by the way , if you are curious to see what it migth look like ! and thanks again , gob bless you , i wich you all succes :wink:

7

thanks a lot man the game is on the google play store as of now , and i owe it to you and to all the guys that helped me here ! i hope to have the chance to give back to the community somehow , the name of the game is Z-Fury by the way , if you are curious to see what it migth look like ! and thanks again , gob bless you , i wich you all succes