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| | | |
| | | /** |
| | | * 根据正方形网格中心点坐标,计算4个顶点坐标 |
| | | * 网格中心点坐标按照从左到右、从上到下的顺序排列 |
| | | * @param points 网格中心坐标点数组 |
| | | */ |
| | | fun calGridVertex(points: List<Pair<Double, Double>>): List<GridVertex> { |
| | | // 网格少于2个,则无法绘制 |
| | | if (points.size < 2) return emptyList() |
| | | val p1 = points[0]; |
| | | val p2 = points[1]; |
| | | // 获取前两个网格 |
| | | // Fixme 2025.01.10: 目前先简化逻辑,按照前两个点是左右排布,且点p2在点p1的东边 |
| | | val p1 = points[0] |
| | | val p2 = points[1] |
| | | // 两中心点间的角度 |
| | | val angle = MapUtil.getAngle(p1.first, p1.second, p2.first, p2.second); |
| | | val angle = MapUtil.getAngle(p1.first, p1.second, p2.first, p2.second) |
| | | // 两中心点间的距离 |
| | | val dis = MapUtil.getDistance(p1.first, p1.second, p2.first, p2.second); |
| | | val dis = MapUtil.getDistance(p1.first, p1.second, p2.first, p2.second) |
| | | // 网格正方形对角线的一半长度 |
| | | val halfDiagonal = sqrt((dis / 2) * (dis / 2) * 2); |
| | | val halfDiagonal = sqrt((dis / 2) * (dis / 2) * 2) |
| | | // 计算首个正方形各顶点相对于中心点的角度,得到正方形各顶点的坐标 |
| | | val angle1 = MapUtil.plusAngle(angle, 45.0); |
| | | val gp1 = MapUtil.getPointByLen(p1, halfDiagonal, angle1 * PI / 180); |
| | | val angle2 = MapUtil.plusAngle(angle1, 90.0); |
| | | val gp2 = MapUtil.getPointByLen(p1, halfDiagonal, angle2 * PI / 180); |
| | | val angle3 = MapUtil.plusAngle(angle2, 90.0); |
| | | val gp3 = MapUtil.getPointByLen(p1, halfDiagonal, angle3 * PI / 180); |
| | | val angle4 = MapUtil.plusAngle(angle3, 90.0); |
| | | val gp4 = MapUtil.getPointByLen(p1, halfDiagonal, angle4 * PI / 180); |
| | | // 4个顶点按照从左上角开始,顺时针方向的顺序进行排列 |
| | | val angle1 = MapUtil.plusAngle(angle, 45.0 + 180.0) |
| | | val gp1 = MapUtil.getPointByLen(p1, halfDiagonal, angle1 * PI / 180) |
| | | val angle2 = MapUtil.plusAngle(angle1, 90.0) |
| | | val gp2 = MapUtil.getPointByLen(p1, halfDiagonal, angle2 * PI / 180) |
| | | val angle3 = MapUtil.plusAngle(angle2, 90.0) |
| | | val gp3 = MapUtil.getPointByLen(p1, halfDiagonal, angle3 * PI / 180) |
| | | val angle4 = MapUtil.plusAngle(angle3, 90.0) |
| | | val gp4 = MapUtil.getPointByLen(p1, halfDiagonal, angle4 * PI / 180) |
| | | // 计算4个顶点分别与中心点的经纬度差值 |
| | | val dx1 = gp1.first - p1.first |
| | | val dy1 = gp1.second - p1.second |
| | |
| | | } |
| | | |
| | | /** |
| | | * 拆分网格 |
| | | * 拆分网格为细分网格,所有网格应该是相同边长的正方形 |
| | | * 根据相似矩形的原理,可以分别按比例得到每个细分网格的经纬度 |
| | | * @param gridCellList 原始网格数组 |
| | | * @param scale 拆分的系数,例如 2,表示将原有网格按边长的 1/2 拆分成 2 * 2 的4个网格 |
| | | * @param groupId 细分后的网格所属的网格组id |
| | | * @return |
| | | */ |
| | | fun splitGrid(gridCellList: List<GridCell?>): List<GridCell> { |
| | | TODO() |
| | | fun splitGrid(gridCellList: List<GridCell?>, scale: Int, groupId:Int): List<GridCell?> { |
| | | if (scale <= 0) throw IllegalArgumentException("网格拆分的数量不能小于1") |
| | | // 拆分系数为1,则表示不拆分 |
| | | if (scale == 1) return gridCellList |
| | | if (gridCellList.isEmpty()) return emptyList() |
| | | |
| | | val newGridCellList = mutableListOf<GridCell>() |
| | | |
| | | // 根据函数[calGridVertex]生成的网格4个顶点坐标,以上北下南左西右东方向为标准 |
| | | // 计算首个网格中心坐标点分别和4个顶点的经纬度差值 |
| | | val p = gridCellList.find { it != null }!! |
| | | // (通过近似平面坐标系的方式)根据单个原始网格的4个顶点坐标,分别确定以下三组坐标点之间的经纬度单位偏移量 |
| | | val p1 = p.point1Lon to p.point1Lat |
| | | val p2 = p.point2Lon to p.point2Lat |
| | | val p3 = p.point3Lon to p.point3Lat |
| | | val p4 = p.point4Lon to p.point4Lat |
| | | // p1、p3的经纬度单位差值 |
| | | val dx1 = (p3.first - p1.first) / scale.toBigDecimal() |
| | | val dy1 = (p3.second - p1.second) / scale.toBigDecimal() |
| | | // p1、p2的经纬度单位差值 |
| | | val dx2 = (p2.first - p1.first) / scale.toBigDecimal() |
| | | val dy2 = (p2.second - p1.second) / scale.toBigDecimal() |
| | | // p3、p4的经纬度单位差值 |
| | | val dx3 = (p4.first - p3.first) / scale.toBigDecimal() |
| | | val dy3 = (p4.second - p3.second) / scale.toBigDecimal() |
| | | // 中心点和p1的经纬度单位差值 |
| | | val dxC = (p.longitude - p1.first) / scale.toBigDecimal() |
| | | val dyC = (p.latitude - p1.second) / scale.toBigDecimal() |
| | | |
| | | // 网格索引 |
| | | var cellIndex = 0 |
| | | |
| | | // 对网格组内的所有网格进行网格细分 |
| | | gridCellList.forEach { g -> |
| | | if (g == null) return@forEach |
| | | |
| | | // 网格行循环 |
| | | for (row in 0 until scale) { |
| | | val newGridCell1 = GridCell() |
| | | |
| | | // 确定每一行首个细分网格的中心坐标和4个顶点坐标 |
| | | // 左上角顶点根据所在行数在原始网格顶点基础上增加偏移量 |
| | | newGridCell1.point1Lon = g.point1Lon + dx1 * row.toBigDecimal() |
| | | newGridCell1.point1Lat = g.point1Lat + dy1 * row.toBigDecimal() |
| | | // 左下角顶点根据所在行数在原始网格顶点基础上增加偏移量(比左上角顶点多一个偏移) |
| | | newGridCell1.point3Lon = g.point1Lon + dx1 * (row + 1).toBigDecimal() |
| | | newGridCell1.point3Lat = g.point1Lat + dy1 * (row + 1).toBigDecimal() |
| | | // 右上角顶点在细分网格左上角的基础上增加相应的偏移量 |
| | | newGridCell1.point2Lon = newGridCell1.point1Lon + dx2 |
| | | newGridCell1.point2Lat = newGridCell1.point1Lat + dy2 |
| | | // 右下角顶点在细分网格左下角的基础上增加相应的偏移量 |
| | | newGridCell1.point4Lon = newGridCell1.point3Lon + dx3 |
| | | newGridCell1.point4Lat = newGridCell1.point3Lat + dy3 |
| | | // 中心点在细分网格左上角的基础上增加固定偏移量 |
| | | newGridCell1.longitude = newGridCell1.point1Lon + dxC |
| | | newGridCell1.latitude = newGridCell1.point1Lat + dyC |
| | | |
| | | newGridCell1.groupId = groupId |
| | | newGridCell1.cellIndex = ++cellIndex |
| | | newGridCell1.fatherCellIndex = g.cellIndex |
| | | |
| | | // 加入结果集合 |
| | | newGridCellList.add(newGridCell1) |
| | | |
| | | // 网格列循环(从第2列开始) |
| | | for (col in 1 until scale) { |
| | | val newGridCell = GridCell() |
| | | newGridCell.point1Lon = newGridCell1.point1Lon + dx2 * col.toBigDecimal() |
| | | newGridCell.point1Lat = newGridCell1.point1Lat + dy2 * col.toBigDecimal() |
| | | newGridCell.point2Lon = newGridCell1.point2Lon + dx2 * col.toBigDecimal() |
| | | newGridCell.point2Lat = newGridCell1.point2Lat + dy2 * col.toBigDecimal() |
| | | newGridCell.point3Lon = newGridCell1.point3Lon + dx3 * col.toBigDecimal() |
| | | newGridCell.point3Lat = newGridCell1.point3Lat + dy3 * col.toBigDecimal() |
| | | newGridCell.point4Lon = newGridCell1.point4Lon + dx3 * col.toBigDecimal() |
| | | newGridCell.point4Lat = newGridCell1.point4Lat + dy3 * col.toBigDecimal() |
| | | newGridCell.longitude = newGridCell.point1Lon + dxC |
| | | newGridCell.latitude = newGridCell.point1Lat + dyC |
| | | |
| | | newGridCell.groupId = groupId |
| | | newGridCell.cellIndex = ++cellIndex |
| | | newGridCell.fatherCellIndex = g.cellIndex |
| | | |
| | | newGridCellList.add(newGridCell) |
| | | } |
| | | } |
| | | } |
| | | return newGridCellList |
| | | } |
| | | |
| | | } |