| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view.math; |
| |
| public class Math3DHelper { |
| |
| private Math3DHelper() { } |
| |
| public final static int min(int x1, int x2, int x3) { |
| return (x1 > x2) ? ((x2 > x3) ? x3 : x2) : ((x1 > x3) ? x3 : x1); |
| } |
| |
| public final static int max(int x1, int x2, int x3) { |
| return (x1 < x2) ? ((x2 < x3) ? x3 : x2) : ((x1 < x3) ? x3 : x1); |
| } |
| |
| /** |
| * @return Rect bound of flattened (ignoring z). LTRB |
| * @param dimension - 2D or 3D |
| */ |
| public static float[] flatBound(float[] poly, int dimension) { |
| int polySize = poly.length/dimension; |
| float left = poly[0]; |
| float right = poly[0]; |
| float top = poly[1]; |
| float bottom = poly[1]; |
| |
| for (int i = 0; i < polySize; i++) { |
| float x = poly[i * dimension + 0]; |
| float y = poly[i * dimension + 1]; |
| |
| if (left > x) { |
| left = x; |
| } else if (right < x) { |
| right = x; |
| } |
| |
| if (top > y) { |
| top = y; |
| } else if (bottom < y) { |
| bottom = y; |
| } |
| } |
| return new float[]{left, top, right, bottom}; |
| } |
| |
| /** |
| * Translate the polygon to x and y |
| * @param dimension in what dimension is polygon represented (supports 2 or 3D). |
| */ |
| public static void translate(float[] poly, float translateX, float translateY, int dimension) { |
| int polySize = poly.length/dimension; |
| |
| for (int i = 0; i < polySize; i++) { |
| poly[i * dimension + 0] += translateX; |
| poly[i * dimension + 1] += translateY; |
| } |
| } |
| |
| } |
| |