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54 lines
1.6 KiB
54 lines
1.6 KiB
using UnityEditor;
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using UnityEngine;
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[CustomEditor(typeof(BezierCurve))]
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public class BezierCurveInspector : Editor {
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private const int lineSteps = 10;
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private const float directionScale = 0.5f;
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private BezierCurve curve;
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private Transform handleTransform;
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private Quaternion handleRotation;
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private void OnSceneGUI () {
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curve = target as BezierCurve;
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handleTransform = curve.transform;
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handleRotation = Tools.pivotRotation == PivotRotation.Local ?
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handleTransform.rotation : Quaternion.identity;
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Vector3 p0 = ShowPoint(0);
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Vector3 p1 = ShowPoint(1);
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Vector3 p2 = ShowPoint(2);
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Vector3 p3 = ShowPoint(3);
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Handles.color = Color.gray;
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Handles.DrawLine(p0, p1);
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Handles.DrawLine(p2, p3);
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ShowDirections();
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Handles.DrawBezier(p0, p3, p1, p2, Color.white, null, 2f);
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}
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private void ShowDirections () {
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Handles.color = Color.green;
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Vector3 point = curve.GetPoint(0f);
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Handles.DrawLine(point, point + curve.GetDirection(0f) * directionScale);
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for (int i = 1; i <= lineSteps; i++) {
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point = curve.GetPoint(i / (float)lineSteps);
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Handles.DrawLine(point, point + curve.GetDirection(i / (float)lineSteps) * directionScale);
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}
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}
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private Vector3 ShowPoint (int index) {
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Vector3 point = handleTransform.TransformPoint(curve.points[index]);
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EditorGUI.BeginChangeCheck();
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point = Handles.DoPositionHandle(point, handleRotation);
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if (EditorGUI.EndChangeCheck()) {
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Undo.RecordObject(curve, "Move Point");
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EditorUtility.SetDirty(curve);
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curve.points[index] = handleTransform.InverseTransformPoint(point);
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}
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return point;
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}
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}
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