116 lines
3 KiB
C#
116 lines
3 KiB
C#
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using Godot;
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namespace SpaceCapture;
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public partial class PlanetsUI : Control
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{
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Trail _trail;
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/// <summary>
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/// Container for trails.
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/// </summary>
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/// <value></value>
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[Export]
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public Node2D TrailsContainer { get; set; }
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[Signal]
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public delegate void FleetDispatchedEventHandler(ControlPlanet from, ControlPlanet to);
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public void RegisterPlanet(ControlPlanet control)
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{
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control.Selected += OnPlanetSelected;
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control.PointerEntered += OnPlanetPointerEntered;
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control.PointerExited += OnPlanetPointerExited;
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}
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public override void _Ready()
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{
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_trail = SceneTemplates.Scenes.Trail.Instantiate<Trail>();
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_trail.Visible = false;
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TrailsContainer.AddChild(_trail);
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}
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public override void _Process(double delta)
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{
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UpdateTrail(delta, false);
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}
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public override void _UnhandledInput(InputEvent inputEvent)
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{
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if (inputEvent is InputEventMouse e)
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HandleMouseInput(e);
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}
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#region Mouse input
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Vector2 _lastCursorPosition;
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void HandleMouseInput(InputEventMouse inputEvent)
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{
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if (inputEvent is InputEventMouseMotion e)
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{
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// The trail follows the cursor.
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_lastCursorPosition = e.GlobalPosition;
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}
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if (inputEvent is InputEventMouseButton e2 && e2.ButtonIndex is MouseButton.Left && e2.IsReleased())
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{
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// The trail disappears when no longer dragging.
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_draggingFromPlanet = false;
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// Detect mouse released on a planet and spawn a fleet.
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if (_selectedPlanet?.Player is PlayerLocal && _pointedPlanet is not null)
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EmitSignal(SignalName.FleetDispatched, _selectedPlanet, _pointedPlanet);
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}
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}
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#endregion
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#region Planets
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ControlPlanet _selectedPlanet;
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ControlPlanet _pointedPlanet;
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bool _draggingFromPlanet;
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void OnPlanetSelected(ControlPlanet planet)
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{
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if (_selectedPlanet is not null)
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_selectedPlanet.IsSelected = false;
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_selectedPlanet = planet;
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_selectedPlanet.IsSelected = true;
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_draggingFromPlanet = true;
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UpdateTrail(0.0, true);
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}
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void OnPlanetPointerEntered(ControlPlanet planet)
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{
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_pointedPlanet = planet;
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}
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void OnPlanetPointerExited(ControlPlanet planet)
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{
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if (_pointedPlanet == planet)
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_pointedPlanet = null;
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}
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#endregion
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#region Trail
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void UpdateTrail(double delta, bool snapPosition)
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{
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_trail.ShowTrail = _draggingFromPlanet && _selectedPlanet is not null && _selectedPlanet.Player is PlayerLocal;
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if (_trail.ShowTrail)
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{
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_trail.Color = _selectedPlanet.Player.Color;
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var targetPosition = _pointedPlanet?.GlobalPosition ?? _lastCursorPosition;
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_trail.StartPosition = _selectedPlanet.GlobalPosition;
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_trail.EndPosition = snapPosition ? targetPosition : Utils.Damp(_trail.EndPosition, targetPosition, 1e-20f, delta);
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}
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}
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#endregion
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}
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