114 lines
3.2 KiB
C#
114 lines
3.2 KiB
C#
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// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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using UnityEngine;
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/// Draws a circular reticle in front of any object that the user points at.
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/// The circle dilates if the object is clickable.
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[AddComponentMenu("GoogleVR/UI/GvrReticlePointer")]
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[RequireComponent(typeof(Renderer))]
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public class GvrReticlePointer : MonoBehaviour {
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private GvrReticlePointerImpl reticlePointerImpl;
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/// Number of segments making the reticle circle.
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public int reticleSegments = 20;
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/// Growth speed multiplier for the reticle/
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public float reticleGrowthSpeed = 8.0f;
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void Awake() {
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reticlePointerImpl = new GvrReticlePointerImpl();
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}
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void Start() {
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reticlePointerImpl.OnStart();
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reticlePointerImpl.MaterialComp = gameObject.GetComponent<Renderer>().material;
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UpdateReticleProperties();
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CreateReticleVertices();
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}
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void Update() {
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UpdateReticleProperties();
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reticlePointerImpl.UpdateDiameters();
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}
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public void SetAsMainPointer() {
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GvrPointerManager.Pointer = reticlePointerImpl;
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}
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private void CreateReticleVertices() {
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Mesh mesh = new Mesh();
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gameObject.AddComponent<MeshFilter>();
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GetComponent<MeshFilter>().mesh = mesh;
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int segments_count = reticleSegments;
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int vertex_count = (segments_count+1)*2;
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#region Vertices
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Vector3[] vertices = new Vector3[vertex_count];
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const float kTwoPi = Mathf.PI * 2.0f;
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int vi = 0;
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for (int si = 0; si <= segments_count; ++si) {
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// Add two vertices for every circle segment: one at the beginning of the
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// prism, and one at the end of the prism.
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float angle = (float)si / (float)(segments_count) * kTwoPi;
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float x = Mathf.Sin(angle);
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float y = Mathf.Cos(angle);
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vertices[vi++] = new Vector3(x, y, 0.0f); // Outer vertex.
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vertices[vi++] = new Vector3(x, y, 1.0f); // Inner vertex.
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}
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#endregion
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#region Triangles
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int indices_count = (segments_count+1)*3*2;
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int[] indices = new int[indices_count];
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int vert = 0;
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int idx = 0;
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for (int si = 0; si < segments_count; ++si) {
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indices[idx++] = vert+1;
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indices[idx++] = vert;
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indices[idx++] = vert+2;
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indices[idx++] = vert+1;
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indices[idx++] = vert+2;
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indices[idx++] = vert+3;
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vert += 2;
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}
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#endregion
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mesh.vertices = vertices;
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mesh.triangles = indices;
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mesh.RecalculateBounds();
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#if !UNITY_5_5_OR_NEWER
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// Optimize() is deprecated as of Unity 5.5.0p1.
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mesh.Optimize();
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#endif // !UNITY_5_5_OR_NEWER
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}
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private void UpdateReticleProperties() {
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if (reticlePointerImpl == null) {
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return;
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}
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reticlePointerImpl.ReticleGrowthSpeed = reticleGrowthSpeed;
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reticlePointerImpl.PointerTransform = transform;
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}
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}
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