commonMain.scheme.SchemeContent.kt Maven / Gradle / Ivy

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/*
 * Copyright (c) 2024, Google LLC, OpenSavvy and contributors.
 *
 * 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 opensavvy.material3.colors.scheme

import opensavvy.material3.colors.dislike.DislikeAnalyzer
import opensavvy.material3.colors.dynamiccolor.DynamicScheme
import opensavvy.material3.colors.dynamiccolor.Variant
import opensavvy.material3.colors.hct.Hct
import opensavvy.material3.colors.palettes.TonalPalette
import opensavvy.material3.colors.temperature.TemperatureCache
import kotlin.math.max

/**
 * A scheme that places the source color in Scheme.primaryContainer.
 *
 *
 * Primary Container is the source color, adjusted for color relativity. It maintains constant
 * appearance in light mode and dark mode. This adds ~5 tone in light mode, and subtracts ~5 tone in
 * dark mode.
 *
 *
 * Tertiary Container is an analogous color, specifically, the analog of a color wheel divided
 * into 6, and the precise analog is the one found by increasing hue. This is a scientifically
 * grounded equivalent to rotating hue clockwise by 60 degrees. It also maintains constant
 * appearance.
 */
class SchemeContent(sourceColorHct: Hct, isDark: Boolean, contrastLevel: Double) : DynamicScheme(
	sourceColorHct = sourceColorHct,
	variant = Variant.CONTENT,
	isDark = isDark,
	contrastLevel = contrastLevel,
	primaryPalette = TonalPalette.fromHueAndChroma(sourceColorHct.hue, sourceColorHct.chroma),
	secondaryPalette = TonalPalette.fromHueAndChroma(
		sourceColorHct.hue,
		max(sourceColorHct.chroma - 32.0, sourceColorHct.chroma * 0.5)),
	tertiaryPalette = TonalPalette.fromHct(
		DislikeAnalyzer.fixIfDisliked(
			TemperatureCache(sourceColorHct)
				.getAnalogousColors( /* count= */3,  /* divisions= */6)[2])),
	neutralPalette = TonalPalette.fromHueAndChroma(sourceColorHct.hue, sourceColorHct.chroma / 8.0),
	neutralVariantPalette = TonalPalette.fromHueAndChroma(
		sourceColorHct.hue, (sourceColorHct.chroma / 8.0) + 4.0))