Fries
8072cf4961
i made a BasePaddle class so i can put commonly used fields in a base class. this means i made a new plugin called CustomTypes which contains both Base classes.
105 lines
3.2 KiB
C#
105 lines
3.2 KiB
C#
using System;
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using System.Collections.Generic;
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using Godot.Collections;
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using Pong.Scripts.Data;
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using Pong.Scripts.Managers;
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namespace Pong.Scripts.Objects;
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public partial class Enemy : BasePaddle
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{
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/// <summary>
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/// draw shapes to the screen (like <see cref="_scanArea"/>).
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/// </summary>
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[Export] private bool _drawDebugShapes;
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private CollisionShape2D _collisionShape;
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private Rect2 _scanArea;
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private PhysicsDirectSpaceState2D _spaceState;
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private readonly Variant _collider = "collider";
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private PhysicsShapeQueryParameters2D _query;
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public override void _EnterTree()
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{
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base._EnterTree();
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ScalingManager.NewEnemyPosition += SetNewPosition;
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_collisionShape = GetNode<CollisionShape2D>("CollisionShape2D");
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GenerateCastArea();
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_spaceState = GetWorld2D().DirectSpaceState;
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_query = new PhysicsShapeQueryParameters2D
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{
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Shape = new RectangleShape2D { Size = _scanArea.Size },
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Exclude = new Array<Rid>(new[] { GetRid() })
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};
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}
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public override void _PhysicsProcess(double delta)
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{
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}
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public override void _IntegrateForces(PhysicsDirectBodyState2D state)
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{
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if (NewPosition.HasValue)
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{
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state.Transform = new Transform2D(0, NewPosition.Value);
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NewPosition = null;
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}
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Scan(GetPhysicsProcessDeltaTime(), state);
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}
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public override void _Draw()
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{
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if (!_drawDebugShapes) return;
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DrawRect(_scanArea, Colors.Aqua);
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}
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private void Scan(double delta, PhysicsDirectBodyState2D state)
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{
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var result = _spaceState.IntersectShape(_query);
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if (result.Count <= 0)
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{
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LinearVelocity = Vector2.Zero;
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return;
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}
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TrackBall(delta, result, state);
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}
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/// <summary>
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/// track the distance between the ball and the enemy paddle on the y axis and move velocity accordingly.
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/// </summary>
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/// <param name="delta">how long it took to complete the last frame in seconds. this should be constant as
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/// should be executed in the physics process method which should be separate from the main frame rate.</param>
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/// <param name="result">a dictionary of objects that collided with the cast. this method only works if
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/// theres an object that has the Ball class.</param>
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/// <param name="state"></param>
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private void TrackBall(double delta, IReadOnlyList<Dictionary> result, PhysicsDirectBodyState2D state)
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{
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// checks if the collider is a ball, if not, return.
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if (result[0][_collider].As<Ball>() is not { } ball) return;
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// gets the sign of the distance between the ball and the paddle on the y axis
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var normalisedDistance = new Vector2 { Y = Mathf.Sign(ball.Position.Y - Position.Y) };
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var linearVelocity = normalisedDistance * MoveSpeed.ByMeter();
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// lerp the velocity to smooth out jerky movement.
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state.LinearVelocity = LinearVelocity.Lerp(linearVelocity, delta);
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}
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/// <summary>
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/// generate the shape that the cast uses to detect collisions.
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/// </summary>
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/// <exception cref="InvalidOperationException">if the collision shape is not a rectangle shape.</exception>
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private void GenerateCastArea()
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{
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if (_collisionShape.Shape is not RectangleShape2D shape)
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throw new InvalidOperationException("the collision shape needs to be a rectangle shape");
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// grow the area the enemy can see by around half of the screen area.
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_scanArea = shape.GetRect().GrowSide(Side.Left, 400).GrowIndividual(0, 190, 0, 190);
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}
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}
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