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/*
* Copyright 2022 Google LLC
*
* 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 com.google.ux.material.libmonet.scheme;
import com.google.ux.material.libmonet.hct.Hct;
import com.google.ux.material.libmonet.palettes.TonalPalette;
import com.google.ux.material.libmonet.utils.MathUtils;
/**
* Provides important settings for creating colors dynamically, and 6 color palettes. Requires: 1. A
* color. (source color) 2. A theme. (Variant) 3. Whether or not its dark mode. 4. Contrast level.
* (-1 to 1, currently contrast ratio 3.0 and 7.0)
*/
public class DynamicScheme {
public final int sourceColorArgb;
public final Hct sourceColorHct;
public final Variant variant;
public final boolean isDark;
public final double contrastLevel;
public final TonalPalette primaryPalette;
public final TonalPalette secondaryPalette;
public final TonalPalette tertiaryPalette;
public final TonalPalette neutralPalette;
public final TonalPalette neutralVariantPalette;
public final TonalPalette errorPalette;
public DynamicScheme(
Hct sourceColorHct,
Variant variant,
boolean isDark,
double contrastLevel,
TonalPalette primaryPalette,
TonalPalette secondaryPalette,
TonalPalette tertiaryPalette,
TonalPalette neutralPalette,
TonalPalette neutralVariantPalette) {
this.sourceColorArgb = sourceColorHct.toInt();
this.sourceColorHct = sourceColorHct;
this.variant = variant;
this.isDark = isDark;
this.contrastLevel = contrastLevel;
this.primaryPalette = primaryPalette;
this.secondaryPalette = secondaryPalette;
this.tertiaryPalette = tertiaryPalette;
this.neutralPalette = neutralPalette;
this.neutralVariantPalette = neutralVariantPalette;
this.errorPalette = TonalPalette.fromHueAndChroma(25.0, 84.0);
}
/**
* Given a set of hues and set of hue rotations, locate which hues the source color's hue is
* between, apply the rotation at the same index as the first hue in the range, and return the
* rotated hue.
*
* @param sourceColorHct The color whose hue should be rotated.
* @param hues A set of hues.
* @param rotations A set of hue rotations.
* @return Color's hue with a rotation applied.
*/
public static double getRotatedHue(Hct sourceColorHct, double[] hues, double[] rotations) {
final double sourceHue = sourceColorHct.getHue();
if (rotations.length == 1) {
return MathUtils.sanitizeDegreesDouble(sourceHue + rotations[0]);
}
final int size = hues.length;
for (int i = 0; i <= (size - 2); i++) {
final double thisHue = hues[i];
final double nextHue = hues[i + 1];
if (thisHue < sourceHue && sourceHue < nextHue) {
return MathUtils.sanitizeDegreesDouble(sourceHue + rotations[i]);
}
}
// If this statement executes, something is wrong, there should have been a rotation
// found using the arrays.
return sourceHue;
}
}
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