Unity Platform 05 Additional Jump
===
2020.08.11

###### tags: `platform`

## List
1. [Additional Jump Technics](#AJT)

## Content
### Additional Jump Technics<a id="AJT"/>
<b>*Apply Jump*</b> is most technical movement. Double jump, wall jump, jump delay...<br>We make some addtional jump through next steps.

1. Delete Air Drag Move
This is no need for us.<br>

**Before**

protected void applyMovement()
    {
        if (isGrounded)
            rb2D.velocity = new Vector2(velocity * moveDirection, rb2D.velocity.y);
        // This for Charactor while jump, move little different.
        else if (!isGrounded && !isWallSliding && moveDirection != 0)
        {
            Vector2 forceToAdd = new Vector2(movementForceInAir * moveDirection, 0);
            rb2D.AddForce(forceToAdd);

            if (Mathf.Abs(rb2D.velocity.x) > velocity)
                rb2D.velocity = new Vector2(velocity * moveDirection, rb2D.velocity.y);
        }
        // This for slow down airmove when stop input. move speed slow down.
        else if (!isGrounded && !isWallSliding && moveDirection == 0)
        {
            rb2D.velocity = new Vector2(rb2D.velocity.x * airDragMultiplier, rb2D.velocity.y);
        }
        
        ~~~
    }

**After**

protected void applyMovement()
    {
        // This for slow down airmove when stop input. move speed slow down.
        if (!isGrounded && !isWallSliding && moveDirection == 0)
        {
            rb2D.velocity = new Vector2(rb2D.velocity.x * airDragMultiplier, rb2D.velocity.y);
        }
        else 
        {
            rb2D.velocity = new Vector2(velocity * moveDirection, rb2D.velocity.y);
        }
            
        ~~~
    }

2. Jump Option splitted & Edit CheckIfJump
Wall Jump and Normal Jump splitted. Condition_Check is also splitted

**Before**

private bool canJump;

private void CheckIfJump()
{
    if ((isGrounded && rb2D.velocity.y <= 0) || isWallSliding)
        amountOfJumpsLeft = amountOfJumps;
    ~~~    
}

**After**

private bool canNormalJump;
private bool canWallJump;

private void CheckIfJump()
{
    if (isGrounded && rb2D.velocity.y <= 0.01f)
        amountOfJumpsLeft = amountOfJumps;
        
    if (isTouchingWall)
        canWallJump = true;
    ~~~
}

3. Edit Jump
Split Jump to Wall, Slide jump function.<br>Must Check conditions are right.

**Before**

protected void CheckInput()
{
    moveDirection = Input.GetAxisRaw("horizontal");

    if (Input.GetButtonDown("Jump"))
        Jump();

    // This for change jump tab height;
    if (Input.GetButtonUp("Jump"))
        rb2D.velocity = new Vector2(rb2D.velocity.x, rb2D.velocity.y * jumpHighierMultiplier);

}


protected void Jump()
{
    if (canJump && !isWallSliding) // !isWallSliding is wall jump
    {
        rb2D.velocity = new Vector2(rb2D.velocity.x, jumpForce);
        amountOfJumpsLeft--;
    }
    // Below is for Hopping Wall(Just down ward(not jump))
    else if (isWallSliding && moveDirection == 0 && canJump)
    {
        isWallSliding = false;
        amountOfJumpsLeft--;
        Vector2 forceToAdd = new Vector2(wallHopForce * wallHopDirection.x * -facingDirection, wallHopForce * wallHopDirection.y);
        rb2D.AddForce(forceToAdd, ForceMode2D.Impulse);
    }
    // Below is for Jump at Wall
    else if ((isWallSliding || isTouchingWall) && moveDirection != 0 && canJump)
    {
        isWallSliding = false;
        amountOfJumpsLeft--;
        Vector2 forceToAdd = new Vector2(wallJumpForce * wallJumpDirection.x * moveDirection, wallJumpForce * wallJumpDirection.y);
        rb2D.AddForce(forceToAdd, ForceMode2D.Impulse);
    }
}

**After**

public float jumpTimerSet = 0.15f;
private bool isAttemptingToJump;
private float jumpTimer;

protected void CheckInput()
{
    ~~~
    if (Input.GetButtonDown("Jump"))
    {
        if (isGrounded || (amountOfJumpsLeft > 0 && isTouchingWall))
            NormalJump();
        else
        {
            jumpTimer = jumpTimerSet;
            isAttemptingToJump = true;
        }
    }
    ~~~
}

protected void CheckJump()
{
    if (jumpTimer > 0)
    {
        //wall Jump
        if (!isGrounded && isTouchingWall && moveDirection != 0 && moveDirection != facingDirection)
        {
            WallJump();
        }
        else if (isGrounded)
        {
            NormalJump();
        }
    }
        
    if (isAttemptingToJump)
    {
        jumpTimer -= Time.deltaTime;
    }
}

protected void NormalJump()
{
    if (canNormalJump) // !isWallSliding is wall jump
    {
        rb2D.velocity = new Vector2(rb2D.velocity.x, jumpForce);
        amountOfJumpsLeft--;
        jumpTimer = 0;
        isAttemptingToJump = false;
    }   
}

protected void WallJump()
{
    // Below is for Jump at Wall
    if (canWallJump)
    {
        rb2D.velocity = new Vector2(rb2D.velocity.x, 0.0f);
        isWallSliding = false;
        amountOfJumpsLeft = amountOfJumps;
        amountOfJumpsLeft--;
        Vector2 forceToAdd = new Vector2(wallJumpForce * wallJumpDirection.x * moveDirection, wallJumpForce * wallJumpDirection.y);
        rb2D.AddForce(forceToAdd, ForceMode2D.Impulse);
        jumpTimer = 0;
        isAttemptingToJump = false;
    }
}

4. Edit CheckIfWallSliding
Condition little bit is editted.

private void CheckIfWallSliding()
{
    if (isTouchingWall && moveDirection == facingDirection)
        isWallSliding = true;
    else
        isWallSliding = false;
}

6. Tab off Jump Additionality
Before, use `ButtonUp()` function, now, use `checkJumpMultiplier`

if (checkJumpMultiplier && !Input.GetButton("Jump"))
{
    checkJumpMultiplier = false;
    rb2D.velocity = new Vector2(rb2D.velocity.x, rb2D.velocity.y * jumpHighierMultiplier);
}

7. Move & Flip Error Fix
Turn error be fixed with `canMove` and `canFlip` and `turnTimer`<br>Write below

if (Input.GetButtonDown("horizontal") && isTouchingWall)
{
    if (!isGrounded && moveDirection != facingDirection)
    {
        canMove = false;
        canFlip = false;

        turnTimer = turnTimerSet;
    }
}

if (!canMove)
{
    turnTimer -= Time.deltaTime;
    if (turnTimer <= 0)
    {
        canMove = true;
        canFlip = true;
    }
}

8. Wall Jump Smooth with timer
Wall Jump aslo has timer for its move.<br>Apply below.

private float wallJumpTimer;
private float wallJumpTimerSet = 0.5f;
private bool hasWallJumped;
private int lastWallJumpDirection;


protected void WallJump()
{
        // Below is for Jump at Wall
    if (canWallJump)
    {
        ~~~
        hasWallJumped = true;
        wallJumpTimer = wallJumpTimerSet;
        lastWallJumpDirection = -facingDirection;
    }
}

protected void CheckJump()
{
    ~~~
    /*
    *   For Wall Jump again
    */
    if (wallJumpTimer > 0)
    {
        if (hasWallJumped && moveDirection == -lastWallJumpDirection)
        {
            rb2D.velocity = new Vector2(rb2D.velocity.x, 0.0f);
            hasWallJumped = false;
        }
        else if (wallJumpTimer <= 0)
        {
            hasWallJumped = false;
        }
        else
        {
            wallJumpTimer -= Time.deltaTime;
        }
    }
}