Linear movement - Shaking sprite

[ziomagic]

Hello.

I am porting my WebGL game from Unity3D to Phaser but i have a problem with linear movement of creatures. Sprite is starting to "shake" when moving... I was using 2 diffrent formulas for movement (One is commented in my code bellow) and also trying to round pixels up and down.. (not working).

What can be wrong? I dont want to use physics for movement..

 

function updateCreature(creature, deltaTime) {
    var walkTo = creature.walkTo;
    if(walkTo == null) {
        creature.animations.play('stay');
        return;
    }

    creature.animations.play('run');
    var distance = Phaser.Math.distance(walkTo.x, walkTo.y, creature.position.x, creature.position.y);
    if (distance < 30 ) {
        return;
    }

    var speed = deltaTime * creature.speed;
    var diff = (new Phaser.Point(walkTo.x - creature.position.x, walkTo.y - creature.position.y)).normalize();

    creature.position.x += diff.x * speed;
    creature.position.y += diff.y * speed;
    creature.position.x = Math.round(creature.position.x);
    creature.position.y = Math.round(creature.position.y);
    // var angle = Math.atan2(walkTo.y - creature.position.y, walkTo.x - creature.position.x);
    // creature.position.x += Math.cos(angle) * speed;
    // creature.position.y += Math.sin(angle) * speed;

    if(creature.scale.x > 0) {
        if(creature.position.x < walkTo.x) {
            creature.scale.x *= -1;
        }
    } else if(creature.scale.x < 0) {
        if(creature.position.x > walkTo.x) {
            creature.scale.x *= -1;
        }
    }
    creature.lastDistance = distance;
}