157 lines
4.3 KiB
Kotlin
157 lines
4.3 KiB
Kotlin
package com.icegps.maps.layer
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import android.graphics.Canvas
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import android.graphics.Color
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import android.graphics.DashPathEffect
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import android.graphics.Paint
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import android.util.Log
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import com.icegps.maps.CoordinateManager
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import com.icegps.maps.ktx.TAG
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import com.icegps.maps.model.ScreenPoint
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import com.icegps.math.geometry.Line
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/**
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* @author tabidachinokaze
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* @date 2025/6/13
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*/
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class BoundaryLayer(
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private val coordinateManager: CoordinateManager,
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paintBuilder: (Paint) -> Unit = {
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it.color = Color.BLACK
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it.strokeWidth = 2f
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}
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) : BaseLayer(zIndex = 1) {
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private val lines = mutableListOf<Line>()
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var extendLines = true // 是否延长边界线
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var lineStyle: LineStyle = LineStyle.SOLID
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set(value) {
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field = value
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when (value) {
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LineStyle.SOLID -> {
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paint.style = Paint.Style.STROKE
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paint.pathEffect = null
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}
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LineStyle.DASHED -> {
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paint.style = Paint.Style.STROKE
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paint.pathEffect = DashPathEffect(floatArrayOf(20f, 10f), 0f)
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}
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LineStyle.DOTTED -> {
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paint.style = Paint.Style.STROKE
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paint.pathEffect = DashPathEffect(floatArrayOf(5f, 10f), 0f)
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}
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}
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}
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init {
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paintBuilder(paint)
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}
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override fun onDraw(canvas: Canvas) {
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val (width, height) = coordinateManager.mapSize
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if (width <= 0 || height <= 0) return
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lines.forEachIndexed { index, it ->
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val start = coordinateManager.worldToScreen(it.a)
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val end = coordinateManager.worldToScreen(it.b)
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val line = if (extendLines) extendLine(start, end) else it
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canvas.drawLine(
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line.a.x,
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line.a.y,
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line.b.x,
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line.b.y,
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paint
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)
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Log.d(TAG, "绘制边界线: 线$index(${line.a.x}, ${line.a.y}) - (${line.b.x}, ${line.b.y})")
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}
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}
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fun setBoundaryLines(lines: List<Line>) {
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this.lines.clear()
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this.lines.addAll(lines)
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}
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/**
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* 延长线段至屏幕边缘
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*/
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private fun extendLine(start: ScreenPoint, end: ScreenPoint): Line {
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val mapSize = coordinateManager.mapSize
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val width = mapSize.width.toFloat()
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val height = mapSize.height.toFloat()
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// 计算线段方向向量
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val dx = end.x - start.x
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val dy = end.y - start.y
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// 如果线段是垂直的
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if (dx == 0f) {
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return Line(
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ScreenPoint(start.x, 0f),
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ScreenPoint(start.x, height)
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)
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}
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// 如果线段是水平的
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if (dy == 0f) {
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return Line(
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ScreenPoint(0f, start.y),
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ScreenPoint(width, start.y)
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)
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}
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// 计算线段与屏幕边界的交点
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val slope = dy / dx
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val yIntercept = start.y - slope * start.x
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// 计算与左边界的交点
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val leftX = 0f
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val leftY = yIntercept
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// 计算与右边界的交点
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val rightX = width
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val rightY = slope * width + yIntercept
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// 计算与上边界的交点
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val topY = 0f
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val topX = (topY - yIntercept) / slope
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// 计算与下边界的交点
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val bottomY = height
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val bottomX = (bottomY - yIntercept) / slope
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// 收集所有在屏幕内的交点
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val intersections = mutableListOf<ScreenPoint>()
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if (leftY in 0f..height) {
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intersections.add(ScreenPoint(leftX, leftY))
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}
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if (rightY in 0f..height) {
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intersections.add(ScreenPoint(rightX, rightY))
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}
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if (topX in 0f..width) {
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intersections.add(ScreenPoint(topX, topY))
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}
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if (bottomX in 0f..width) {
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intersections.add(ScreenPoint(bottomX, bottomY))
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}
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// 如果找到了两个交点，返回这两个点
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if (intersections.size >= 2) {
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return Line(intersections[0], intersections[1])
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}
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// 如果没有找到足够的交点，返回原始线段
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return Line(start, end)
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}
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}
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enum class LineStyle {
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SOLID,
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DASHED,
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DOTTED,
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} |