70 lines
2.8 KiB
C#
70 lines
2.8 KiB
C#
// CircleMotion.cs - Script used to move an object in a circle.
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// -----------------------------------------------------------------------------
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// Copyright (c) 2018 Niall Moody
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// -----------------------------------------------------------------------------
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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/// Script used to move an object in a circle.
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public class CircleMotion : MonoBehaviour {
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/// The Transform of the GameObject we're going to move in a circle.
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public Transform objectToMove;
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/// The radius of the circle we're going to move the object in.
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[Range(0.1f, 50.0f)]
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public float radius = 10.0f;
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/// Where we are in the circle right now.
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private float circleIndex;
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/// The circle's centre position.
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private Vector3 centrePos;
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/// Used to setup centrePos.
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void Start () {
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//These lines calculate the centre of the circle we're going to move the
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//object in. We assume the developer has placed the object at the
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//12 o'clock position of the circle, so the centre position is its
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//position - the circle's radius on the z-axis.
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centrePos = objectToMove.transform.position;
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centrePos.z -= radius;
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}
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/// Move the object along its path.
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void Update () {
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Vector3 pos = centrePos;
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//Update circleIndex to move the object further around the circle.
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circleIndex += 0.01f;
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if(circleIndex > (2.0f * Mathf.PI))
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circleIndex -= 2.0f * Mathf.PI;
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//We calculate the object's position by feeding circleIndex into the
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//Sin function for it's x-axis, and Cos for it's z-axis.
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pos.x += Mathf.Sin(circleIndex) * radius;
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pos.z += Mathf.Cos(circleIndex) * radius;
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//Finally, apply our updated position to the object's Transform.
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objectToMove.transform.position = pos;
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}
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}
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