Esempio n. 1
0
        /// <summary>
        /// moves the tank and performs actions based on player location and randomised numbers
        /// </summary>
        /// <param name="deltaTime"></param>
        public override void OnUpdate(float dT)
        {
            //find angle from the turret to the player
            float turretAngle = (float)Math.Atan2(turret.Position.y - Game.player.Position.y, turret.Position.x - Game.player.Position.x);
            //getParent angle in radians relative to world space
            float parentAngle = GetRotate();

            //set the turret's rotation to the turretAngle - parentAngle to compensate for hierachy. Also flip it cuz it ends up backwards otherwise
            turret.SetRotate(turretAngle + (float)Math.PI - parentAngle);

            //if we are near the middle of the screen
            if (collider.Overlaps(Game.arenaBox))
            {
                if (shootTimer > 0)
                {
                    //keep waiting to shoot
                    shootTimer--;
                }
                else
                {
                    //ready to shoot
                    Shoot();
                }


                if (moveTimer > 0)
                {
                    //keep waiting to change direction
                    moveTimer--;
                    //keep moving to in the same direction
                    Move(dT);
                }
                else
                {
                    //randomise movement directions
                    move = Game.Random.Next(0, 2);
                    turn = Game.Random.Next(0, 2);
                    //reset waiting period
                    moveTimer = Game.Random.Next(30, 100);
                }
            }
            //if we are leaving the screen
            else
            {
                //create new temperary matrix3
                Matrix3 angleToCenter = new Matrix3();
                //rotate in 180 degrees
                angleToCenter.SetRotateZ((float)Math.PI);
                //get angle we need to go to
                angleToCenter.RotateZ((float)Math.Atan2(Position.y - Game.arenaBox.Center.y, Position.x - Game.arenaBox.Center.x));

                //determine if we need to turn left or right
                if (angleToCenter.GetRotateZ() < GetRotate())
                {
                    //turn left quickly
                    Rotate(-rotationSpeed * 3);
                }
                else
                {
                    //turn right quickly
                    Rotate(rotationSpeed * 3);
                }

                //move forward
                Vector3 facing = new Vector3(localTransform.m1, localTransform.m2, 1) * dT * 100;
                Translate(facing * speed);
            }

            //if we are completely outside of the map
            if (!collider.Overlaps(Game.totalMapBox))
            {
                //flip 180 to point at home
                Rotate(3.14f);
                //move forwards quickly
                Vector3 facing = new Vector3(localTransform.m1, localTransform.m2, 1) * dT * 100;
                Translate(facing * speed * 4);
            }

            //update tank collider
            collider.Fit(cornersGlobalPosition);
            //update turret collider
            turret.collider.Fit(turret.cornersGlobalPosition);
        }