62 lines
2.6 KiB
C#
62 lines
2.6 KiB
C#
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// Animancer // https://kybernetik.com.au/animancer // Copyright 2018-2023 Kybernetik //
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using UnityEngine;
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namespace Animancer.Examples.InverseKinematics
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{
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/// <summary>Allows the user to drag any object with a collider around on screen with the mouse.</summary>
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/// <example><see href="https://kybernetik.com.au/animancer/docs/examples/ik/puppet">Puppet</see></example>
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/// https://kybernetik.com.au/animancer/api/Animancer.Examples.InverseKinematics/MouseDrag
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///
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[AddComponentMenu(Strings.ExamplesMenuPrefix + "Inverse Kinematics - Mouse Drag")]
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[HelpURL(Strings.DocsURLs.ExampleAPIDocumentation + nameof(InverseKinematics) + "/" + nameof(MouseDrag))]
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public sealed class MouseDrag : MonoBehaviour
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{
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/************************************************************************************************************************/
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private Transform _Dragging;
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private float _Distance;
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/************************************************************************************************************************/
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private void Update()
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{
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// On click, do a raycast from the mouse, grab whatever it hits, and calculate how far away it is.
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if (ExampleInput.LeftMouseDown)
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{
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var ray = Camera.main.ScreenPointToRay(ExampleInput.MousePosition);
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if (Physics.Raycast(ray, out var hit))
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{
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_Dragging = hit.transform;
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var cameraTransform = Camera.main.transform;
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_Distance = Vector3.Dot(_Dragging.position - cameraTransform.position, cameraTransform.forward);
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}
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return;
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}
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// While holding the button, move the object in line with the mouse ray.
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else if (_Dragging != null && ExampleInput.LeftMouseHold)
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{
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var ray = Camera.main.ScreenPointToRay(ExampleInput.MousePosition);
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var cameraTransform = Camera.main.transform;
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var forward = cameraTransform.forward;
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var dot = Vector3.Dot(ray.direction, forward);
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if (dot > 0)
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{
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var planeCenter = cameraTransform.position + forward * _Distance;
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var intersection = ray.origin + ray.direction * Vector3.Dot(planeCenter - ray.origin, forward) / dot;
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_Dragging.position = intersection;
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return;
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}
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}
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_Dragging = null;
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}
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/************************************************************************************************************************/
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}
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}
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