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92 lines
3.5 KiB
92 lines
3.5 KiB
/*
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* Copyright 2021 Google LLC
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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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*/
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// This file is automatically generated. Do not modify it.
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package com.google.ux.material.libmonet.blend;
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import com.google.ux.material.libmonet.hct.Cam16;
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import com.google.ux.material.libmonet.hct.Hct;
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import com.google.ux.material.libmonet.utils.ColorUtils;
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import com.google.ux.material.libmonet.utils.MathUtils;
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/** Functions for blending in HCT and CAM16. */
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public class Blend {
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private Blend() {}
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/**
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* Blend the design color's HCT hue towards the key color's HCT hue, in a way that leaves the
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* original color recognizable and recognizably shifted towards the key color.
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*
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* @param designColor ARGB representation of an arbitrary color.
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* @param sourceColor ARGB representation of the main theme color.
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* @return The design color with a hue shifted towards the system's color, a slightly
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* warmer/cooler variant of the design color's hue.
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*/
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public static int harmonize(int designColor, int sourceColor) {
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Hct fromHct = Hct.fromInt(designColor);
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Hct toHct = Hct.fromInt(sourceColor);
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double differenceDegrees = MathUtils.differenceDegrees(fromHct.getHue(), toHct.getHue());
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double rotationDegrees = Math.min(differenceDegrees * 0.5, 15.0);
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double outputHue =
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MathUtils.sanitizeDegreesDouble(
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fromHct.getHue()
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+ rotationDegrees * MathUtils.rotationDirection(fromHct.getHue(), toHct.getHue()));
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return Hct.from(outputHue, fromHct.getChroma(), fromHct.getTone()).toInt();
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}
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/**
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* Blends hue from one color into another. The chroma and tone of the original color are
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* maintained.
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*
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* @param from ARGB representation of color
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* @param to ARGB representation of color
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* @param amount how much blending to perform; 0.0 >= and <= 1.0
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* @return from, with a hue blended towards to. Chroma and tone are constant.
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*/
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public static int hctHue(int from, int to, double amount) {
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int ucs = cam16Ucs(from, to, amount);
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Cam16 ucsCam = Cam16.fromInt(ucs);
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Cam16 fromCam = Cam16.fromInt(from);
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Hct blended = Hct.from(ucsCam.getHue(), fromCam.getChroma(), ColorUtils.lstarFromArgb(from));
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return blended.toInt();
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}
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/**
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* Blend in CAM16-UCS space.
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*
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* @param from ARGB representation of color
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* @param to ARGB representation of color
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* @param amount how much blending to perform; 0.0 >= and <= 1.0
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* @return from, blended towards to. Hue, chroma, and tone will change.
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*/
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public static int cam16Ucs(int from, int to, double amount) {
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Cam16 fromCam = Cam16.fromInt(from);
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Cam16 toCam = Cam16.fromInt(to);
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double fromJ = fromCam.getJstar();
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double fromA = fromCam.getAstar();
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double fromB = fromCam.getBstar();
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double toJ = toCam.getJstar();
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double toA = toCam.getAstar();
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double toB = toCam.getBstar();
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double jstar = fromJ + (toJ - fromJ) * amount;
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double astar = fromA + (toA - fromA) * amount;
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double bstar = fromB + (toB - fromB) * amount;
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return Cam16.fromUcs(jstar, astar, bstar).toInt();
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}
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}
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