123 lines
4.1 KiB
Kotlin
123 lines
4.1 KiB
Kotlin
package com.icegps.geotools
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import android.util.Log
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/**
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* @author tabidachinokaze
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* @date 2025/11/25
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*/
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class SimplePalette(
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private var range: ClosedFloatingPointRange<Double>
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) {
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fun setRange(range: ClosedFloatingPointRange<Double>) {
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this.range = range
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}
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private val colors: Map<Int, String>
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init {
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colors = generateTerrainColorMap()
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}
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fun palette(value: Double?): String {
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if (value == null) return "#00000000"
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val minH = range.start
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val maxH = range.endInclusive
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val normalized = ((value - minH) / (maxH - minH)).coerceIn(0.0, 1.0)
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return colors[(normalized * 255).toInt()] ?: "#00000000"
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}
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fun palette1(value: Double?): String {
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return if (value == null) "#00000000" else {
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// 假设您已经知道高度范围，或者动态计算
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val minH = range.start
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val maxH = range.endInclusive
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val normalized = ((value - minH) / (maxH - minH)).coerceIn(0.0, 1.0)
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val alpha = (normalized * 255).toInt()
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String.format("#%02X%02X%02X", alpha, 0, 0)
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}.also {
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Log.d("simplePalette", "$value -> $it")
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}
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}
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fun generateGrayscaleColorMap2(): MutableMap<Int, String> {
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val colorMap = mutableMapOf<Int, String>()
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// 定义关键灰度点
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val black = Color(0, 0, 0) // 低地势 - 黑色
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val darkGray = Color(64, 64, 64) // 过渡
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val midGray = Color(128, 128, 128) // 中间
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val lightGray = Color(192, 192, 192) // 过渡
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val white = Color(255, 255, 255) // 高地势 - 白色
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for (i in 0..255) {
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val position = i / 255.0
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val color = when {
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position < 0.25 -> interpolateColor(black, darkGray, position / 0.25)
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position < 0.5 -> interpolateColor(darkGray, midGray, (position - 0.25) / 0.25)
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position < 0.75 -> interpolateColor(midGray, lightGray, (position - 0.5) / 0.25)
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else -> interpolateColor(lightGray, white, (position - 0.75) / 0.25)
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}
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colorMap[i] = color.toHex()
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}
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return colorMap
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}
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fun generateGrayscaleColorMap(): MutableMap<Int, String> {
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val colorMap = mutableMapOf<Int, String>()
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for (i in 0..255) {
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// 从黑色到白色的线性渐变
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val grayValue = i
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val color = Color(grayValue, grayValue, grayValue)
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colorMap[i] = color.toHex()
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}
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return colorMap
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}
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fun generateTerrainColorMap(): MutableMap<Int, String> {
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val colorMap = mutableMapOf<Int, String>()
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// 定义关键颜色点
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val blue = Color(0, 0, 255) // 低地势 - 蓝色
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val cyan = Color(0, 255, 255) // 中间过渡
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val green = Color(0, 255, 0) // 中间过渡
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val yellow = Color(255, 255, 0) // 中间过渡
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val red = Color(255, 0, 0) // 高地势 - 红色
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for (i in 0..255) {
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val position = i / 255.0
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val color = when {
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position < 0.25 -> interpolateColor(blue, cyan, position / 0.25)
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position < 0.5 -> interpolateColor(cyan, green, (position - 0.25) / 0.25)
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position < 0.75 -> interpolateColor(green, yellow, (position - 0.5) / 0.25)
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else -> interpolateColor(yellow, red, (position - 0.75) / 0.25)
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}
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colorMap[i] = color.toHex()
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}
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return colorMap
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}
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fun interpolateColor(start: Color, end: Color, fraction: Double): Color {
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val r = (start.red + (end.red - start.red) * fraction).toInt()
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val g = (start.green + (end.green - start.green) * fraction).toInt()
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val b = (start.blue + (end.blue - start.blue) * fraction).toInt()
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return Color(r, g, b)
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}
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// Color类简化实现
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class Color(val red: Int, val green: Int, val blue: Int) {
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fun toArgb(): Int {
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return (0xFF shl 24) or (red shl 16) or (green shl 8) or blue
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}
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fun toHex(): String {
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return String.format("#%06X", toArgb() and 0xFFFFFF)
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}
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}
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} |