1 /* 2 * Copyright 2021 Google LLC 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 // This file is automatically generated. Do not modify it. 18 19 package com.google.ux.material.libmonet.blend; 20 21 import com.google.ux.material.libmonet.hct.Cam16; 22 import com.google.ux.material.libmonet.hct.Hct; 23 import com.google.ux.material.libmonet.utils.ColorUtils; 24 import com.google.ux.material.libmonet.utils.MathUtils; 25 26 /** Functions for blending in HCT and CAM16. */ 27 public class Blend { Blend()28 private Blend() {} 29 30 /** 31 * Blend the design color's HCT hue towards the key color's HCT hue, in a way that leaves the 32 * original color recognizable and recognizably shifted towards the key color. 33 * 34 * @param designColor ARGB representation of an arbitrary color. 35 * @param sourceColor ARGB representation of the main theme color. 36 * @return The design color with a hue shifted towards the system's color, a slightly 37 * warmer/cooler variant of the design color's hue. 38 */ harmonize(int designColor, int sourceColor)39 public static int harmonize(int designColor, int sourceColor) { 40 Hct fromHct = Hct.fromInt(designColor); 41 Hct toHct = Hct.fromInt(sourceColor); 42 double differenceDegrees = MathUtils.differenceDegrees(fromHct.getHue(), toHct.getHue()); 43 double rotationDegrees = Math.min(differenceDegrees * 0.5, 15.0); 44 double outputHue = 45 MathUtils.sanitizeDegreesDouble( 46 fromHct.getHue() 47 + rotationDegrees * MathUtils.rotationDirection(fromHct.getHue(), toHct.getHue())); 48 return Hct.from(outputHue, fromHct.getChroma(), fromHct.getTone()).toInt(); 49 } 50 51 /** 52 * Blends hue from one color into another. The chroma and tone of the original color are 53 * maintained. 54 * 55 * @param from ARGB representation of color 56 * @param to ARGB representation of color 57 * @param amount how much blending to perform; 0.0 >= and <= 1.0 58 * @return from, with a hue blended towards to. Chroma and tone are constant. 59 */ hctHue(int from, int to, double amount)60 public static int hctHue(int from, int to, double amount) { 61 int ucs = cam16Ucs(from, to, amount); 62 Cam16 ucsCam = Cam16.fromInt(ucs); 63 Cam16 fromCam = Cam16.fromInt(from); 64 Hct blended = Hct.from(ucsCam.getHue(), fromCam.getChroma(), ColorUtils.lstarFromArgb(from)); 65 return blended.toInt(); 66 } 67 68 /** 69 * Blend in CAM16-UCS space. 70 * 71 * @param from ARGB representation of color 72 * @param to ARGB representation of color 73 * @param amount how much blending to perform; 0.0 >= and <= 1.0 74 * @return from, blended towards to. Hue, chroma, and tone will change. 75 */ cam16Ucs(int from, int to, double amount)76 public static int cam16Ucs(int from, int to, double amount) { 77 Cam16 fromCam = Cam16.fromInt(from); 78 Cam16 toCam = Cam16.fromInt(to); 79 double fromJ = fromCam.getJstar(); 80 double fromA = fromCam.getAstar(); 81 double fromB = fromCam.getBstar(); 82 double toJ = toCam.getJstar(); 83 double toA = toCam.getAstar(); 84 double toB = toCam.getBstar(); 85 double jstar = fromJ + (toJ - fromJ) * amount; 86 double astar = fromA + (toA - fromA) * amount; 87 double bstar = fromB + (toB - fromB) * amount; 88 return Cam16.fromUcs(jstar, astar, bstar).toInt(); 89 } 90 } 91 92