137 lines
4.3 KiB
C#
137 lines
4.3 KiB
C#
namespace UnityEngine.XR.Content.Walkthrough
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{
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/// <summary>
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/// Manipulates a line renderer to draw a curved path between two locations
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/// </summary>
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[RequireComponent(typeof(LineRenderer))]
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public class WaypointCurve : MonoBehaviour
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{
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#pragma warning disable 649
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[SerializeField]
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[Tooltip("Where the curved path should begin.")]
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Transform m_StartPoint;
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[SerializeField]
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[Tooltip("Where the curved path should complete.")]
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Transform m_EndPoint;
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[SerializeField]
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[Tooltip("Bends the first control point of the path.")]
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float m_CurveFactorStart = 1.0f;
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[SerializeField]
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[Tooltip("Bends the last control point of the path.")]
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float m_CurveFactorEnd = 1.0f;
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[SerializeField]
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[Tooltip("Enable to make the path animate colors.")]
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bool m_Animate = false;
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[SerializeField]
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[Tooltip("How quickly to animate the path.")]
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float m_AnimSpeed = 0.25f;
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#pragma warning restore 649
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Vector3[] m_ControlPoints = new Vector3[4];
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LineRenderer m_LineRenderer;
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int m_CurveCount = 0;
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int m_LayerOrder = 0;
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int m_SegmentCount = 50;
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float m_Time = 0.0f;
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public Vector3 start
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{
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get => m_StartPoint.position;
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set => m_StartPoint.position = value;
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}
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public Vector3 end
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{
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get => m_EndPoint.position;
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set => m_EndPoint.position = value;
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}
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void Start()
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{
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if (!m_LineRenderer)
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{
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m_LineRenderer = GetComponent<LineRenderer>();
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}
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m_LineRenderer.sortingLayerID = m_LayerOrder;
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m_CurveCount = (int)4 / 3;
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}
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void Update()
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{
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DrawCurve();
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if (m_Animate) { AnimateCurve(); }
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}
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void DrawCurve()
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{
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var dist = Mathf.Clamp(Vector3.Distance(m_StartPoint.position, m_EndPoint.position), 0f, 1f);
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m_ControlPoints[0] = m_StartPoint.position;
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m_ControlPoints[1] = m_StartPoint.position + m_StartPoint.right * (dist * m_CurveFactorStart);
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m_ControlPoints[2] = m_EndPoint.position - m_EndPoint.right * (dist * m_CurveFactorEnd);
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m_ControlPoints[3] = m_EndPoint.position;
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for (int j = 0; j < m_CurveCount; j++)
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{
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for (int i = 1; i <= m_SegmentCount; i++)
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{
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float t = i / (float)m_SegmentCount;
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int nodeIndex = j * 3;
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Vector3 pixel = CalculateCubicBezierPoint(t, m_ControlPoints[nodeIndex], m_ControlPoints[nodeIndex + 1], m_ControlPoints[nodeIndex + 2], m_ControlPoints[nodeIndex + 3]);
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m_LineRenderer.positionCount = (((j * m_SegmentCount) + i));
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m_LineRenderer.SetPosition((j * m_SegmentCount) + (i - 1), pixel);
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}
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}
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}
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Vector3 CalculateCubicBezierPoint(float t, Vector3 p0, Vector3 p1, Vector3 p2, Vector3 p3)
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{
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float u = 1 - t;
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float tt = t * t;
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float uu = u * u;
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float uuu = uu * u;
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float ttt = tt * t;
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Vector3 p = uuu * p0;
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p += 3 * uu * t * p1;
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p += 3 * u * tt * p2;
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p += ttt * p3;
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return p;
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}
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void AnimateCurve()
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{
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Gradient newGrad = new Gradient();
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GradientColorKey[] colorKeys = new GradientColorKey[1];
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GradientAlphaKey[] alphaKeys = new GradientAlphaKey[2];
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GradientColorKey colorKey = new GradientColorKey(new Color(0.1254902f, 0.5882353f, 0.9529412f), 0f);
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colorKeys[0] = colorKey;
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GradientAlphaKey alphaKeyStart1 = new GradientAlphaKey(.25f, m_Time);
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GradientAlphaKey alphaKeyStart = new GradientAlphaKey(.25f, m_Time);
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GradientAlphaKey alphaKeyEnd = new GradientAlphaKey(1f, 1f);
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alphaKeys[0] = alphaKeyStart;
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alphaKeys[1] = alphaKeyEnd;
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newGrad.SetKeys(colorKeys, alphaKeys);
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newGrad.mode = GradientMode.Blend;
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m_LineRenderer.colorGradient = newGrad;
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m_Time += (Time.deltaTime * m_AnimSpeed);
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if (m_Time >= 1f)
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{
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m_Time = 0f;
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}
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}
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}
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}
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