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[bombjack]

Dashinoby will be a game about a ninja killing demons
Not much more about it yet.

[bombjack]

At first I'll do my best to create a pixel-perfect platformer.
By pixel perfect I mean that every movement can precisely specified in pixel.
Most of the unity examples I found where using the physics engine.
I'd prefer to avoid it. So I'll wrote those post if it could help someone like me

I'll use Prime31 CharacterController2D for the base movement. (https://github.com/prime31/CharacterController2D)
Once added the CharacterController2D script, it's important to make sure the RigidBody2D is Simulated and that the GravityScale is set to 0.
If not, you'll run in trouble if you try to have both trigger and collider.

[Penguinoccio]

letter perfect will come later, after all the pixels are done

[bombjack]

letter perfect will come later, after all the pixels are done

Yes I just wrote it too fast before checking it

[bombjack]

Let's talk about movement
The naive approach is to add the speed to the current velocity and multiply by the deltaTime in order to define a number of pixel per second.
The character is directly at max speed and stop as soon as the button is released.
It doesn't feel quite natural.



public float speed=1.92; // 192 pixel per seconds divided by the number of pixel per unit
void Update () {
  var velocity = ctrl.velocity;
  if (Input.GetKey(KeyCode.LeftArrow) ) {
    velocity.x = -speed;
  }
  if (Input.GetKey(KeyCode.RightArrow)) {
    velocity.x = speed;
  }
  ctrl.move(velocity * Time.deltaTime);
}


A better approach is to add acceleration and deceleration ratio to give a more natural feel.
It's interesting to have separate accel and decel instead of a common ratio to allow ice-like behaviour if needed.



public float accel = 0.15f;
public float decel = 0.15f;
void Update () {
  ...
  if (Input.GetKey(KeyCode.LeftArrow) ) {
    velocity.x = accel * -speed + (1-accel) * velocity.x;
  }
  if (Input.GetKey(KeyCode.RightArrow)) {
    velocity.x = accel * speed + (1-accel) * velocity.x;
  }
  if (!Input.GetKey(KeyCode.LeftArrow) && !Input.GetKey(KeyCode.RightArrow)) {
    velocity.x = (1-decel) * velocity.x;
  }
 ...
}