133 lines
3.7 KiB
C#
133 lines
3.7 KiB
C#
// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
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#if USE_LARGE_WORLDS
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using Real = System.Double;
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#else
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using Real = System.Single;
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#endif
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using FlaxEngine;
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namespace FlaxEditor.Viewport.Cameras
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{
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/// <summary>
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/// Implementation of <see cref="ViewportCamera"/> that orbits around the fixed location.
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/// </summary>
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/// <seealso cref="FlaxEditor.Viewport.Cameras.ViewportCamera" />
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[HideInEditor]
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public class ArcBallCamera : ViewportCamera
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{
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private Vector3 _orbitCenter;
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private Real _orbitRadius;
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/// <summary>
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/// Gets or sets the orbit center.
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/// </summary>
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public Vector3 OrbitCenter
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{
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get => _orbitCenter;
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set
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{
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_orbitCenter = value;
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UpdatePosition();
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}
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}
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/// <summary>
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/// Gets or sets the orbit radius.
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/// </summary>
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public Real OrbitRadius
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{
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get => _orbitRadius;
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set
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{
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_orbitRadius = Mathf.Max(value, 0.0001f);
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UpdatePosition();
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}
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}
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/// <inheritdoc />
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public override bool UseMovementSpeed => false;
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/// <summary>
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/// Initializes a new instance of the <see cref="ArcBallCamera"/> class.
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/// </summary>
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public ArcBallCamera()
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ArcBallCamera"/> class.
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/// </summary>
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/// <param name="orbitCenter">The orbit center.</param>
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/// <param name="radius">The orbit radius.</param>
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public ArcBallCamera(Vector3 orbitCenter, float radius)
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{
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_orbitCenter = orbitCenter;
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_orbitRadius = radius;
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}
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/// <summary>
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/// Sets view direction.
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/// </summary>
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/// <param name="direction">The view direction.</param>
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public void SetView(Vector3 direction)
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{
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// Rotate
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Viewport.ViewDirection = direction;
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// Update view position
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UpdatePosition();
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}
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/// <summary>
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/// Sets view orientation.
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/// </summary>
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/// <param name="orientation">The view rotation.</param>
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public void SetView(Quaternion orientation)
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{
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// Rotate
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Viewport.ViewOrientation = orientation;
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// Update view position
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UpdatePosition();
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}
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private void UpdatePosition()
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{
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// Move camera to look at orbit center point
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Vector3 localPosition = Viewport.ViewDirection * (-1 * _orbitRadius);
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Viewport.ViewPosition = _orbitCenter + localPosition;
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}
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/// <inheritdoc />
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public override void SetArcBallView(Quaternion orientation, Vector3 orbitCenter, Real orbitRadius)
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{
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base.SetArcBallView(orientation, orbitCenter, orbitRadius);
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_orbitCenter = orbitCenter;
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_orbitRadius = orbitRadius;
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}
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/// <inheritdoc />
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public override void UpdateView(float dt, ref Vector3 moveDelta, ref Float2 mouseDelta, out bool centerMouse)
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{
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centerMouse = true;
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Viewport.GetInput(out EditorViewport.Input input);
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// Rotate
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Viewport.YawPitch += mouseDelta;
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// Zoom
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if (input.IsZooming)
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{
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_orbitRadius = Mathf.Clamp(_orbitRadius - (Viewport.MouseWheelZoomSpeedFactor * input.MouseWheelDelta * 25.0f), 0.001f, 10000.0f);
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}
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// Update view position
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UpdatePosition();
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}
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}
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}
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