93 lines
2.9 KiB
C#
93 lines
2.9 KiB
C#
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using System;
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using UnityEngine;
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using UnityEngine.InputSystem;
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[RequireComponent(typeof(Rigidbody2D), typeof(BoxCollider2D))]
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public class Player : MonoBehaviour
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{
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private Rigidbody2D _rigidbody;
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private bool _wantsJump;
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private bool _isJumping;
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private bool _isGrounded;
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private float _jumpStartTime;
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private float _dir;
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private Vector3 _oldPos;
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public InputAction movement;
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public InputAction jump;
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public float speed = 4;
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[Tooltip("This is the desired height, relative to the initial jump point, in unity units (meters)")]
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public float jumpHeight;
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[Tooltip("This is how long it takes to achieve the `jumpHeight` value")]
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public float jumpDuration;
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private void Start()
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{
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_rigidbody = GetComponent<Rigidbody2D>();
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movement.Enable();
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jump.Enable();
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jump.started += JumpStart;
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jump.canceled += JumpEnd;
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Application.targetFrameRate = 144;
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}
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private void JumpStart(InputAction.CallbackContext callbackContext)
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{
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_wantsJump = true;
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}
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private void JumpEnd(InputAction.CallbackContext callbackContext)
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{
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_wantsJump = false;
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_isJumping = false;
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}
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private void Update()
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{
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_dir = movement.ReadValue<float>();
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_oldPos = _rigidbody.position;
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_oldPos.x += _dir * speed * Time.deltaTime;
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if (_wantsJump && _isGrounded)
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{
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_isJumping = true;
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_isGrounded = false;
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_jumpStartTime = Time.time;
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}
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if (_isJumping && _wantsJump && _jumpStartTime + jumpDuration > Time.time)
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{
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_rigidbody.gravityScale = 0;
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var metersPerSecond = jumpHeight / jumpDuration;
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// This simulates "acceleration" or rather the immediate force of a jump and the falloff due to gravity,
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// without actually using gravity. That sounds odd, and maybe it can be improved, but this was the first
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// solution that gives the designer a maximum height to hit over a duration while allowing the user to
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// end the jump early (like most SNES era platformers). All this while still looking good or "correct".
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// TODO: I think the closer the end value (b in the lerp function) is to 0 the more "correct" it will look.
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var accelerationCoefficient = Mathf.Lerp(1.5f, 0.5f, (Time.time - _jumpStartTime) / jumpDuration);
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_oldPos.y += accelerationCoefficient * metersPerSecond * Time.deltaTime;
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}
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else
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{
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_rigidbody.gravityScale = 1;
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}
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_rigidbody.position = _oldPos;
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}
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private void OnCollisionEnter2D(Collision2D other)
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{
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foreach (var contacts in other.contacts)
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{
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if (contacts.point.y < _rigidbody.position.y)
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{
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// we are grounded and can exit!
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_isGrounded = true;
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return;
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}
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}
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}
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}
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