1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.globaltime; 18 19 import javax.microedition.khronos.opengles.GL10; 20 21 /** 22 * A class representing a set of GL_POINT objects. GlobalTime uses this class 23 * to draw city lights on the night side of the earth. 24 */ 25 public class PointCloud extends Shape { 26 27 /** 28 * Constructs a PointCloud with a point at each of the given vertex 29 * (x, y, z) positions. 30 * @param vertices an array of (x, y, z) positions given in fixed-point. 31 */ 32 public PointCloud(int[] vertices) { 33 this(vertices, 0, vertices.length); 34 } 35 36 /** 37 * Constructs a PointCloud with a point at each of the given vertex 38 * (x, y, z) positions. 39 * @param vertices an array of (x, y, z) positions given in fixed-point. 40 * @param off the starting offset of the vertices array 41 * @param len the number of elements of the vertices array to use 42 */ 43 public PointCloud(int[] vertices, int off, int len) { 44 super(GL10.GL_POINTS, GL10.GL_UNSIGNED_SHORT, 45 false, false, false); 46 47 int numPoints = len / 3; 48 short[] indices = new short[numPoints]; 49 for (int i = 0; i < numPoints; i++) { 50 indices[i] = (short)i; 51 } 52 53 allocateBuffers(vertices, null, null, null, indices); 54 this.mNumIndices = mIndexBuffer.capacity(); 55 } 56 57 @Override public int getNumTriangles() { 58 return mNumIndices * 2; 59 } 60 } 61
