forked from MTSR/mapserver
150 lines
3.1 KiB
Go
150 lines
3.1 KiB
Go
package postgres
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import (
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"mapserver/coords"
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"mapserver/db"
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"mapserver/layer"
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"mapserver/settings"
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"math"
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"github.com/sirupsen/logrus"
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)
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const (
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SETTING_LAST_LAYER = "last_layer"
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SETTING_LAST_X_BLOCK = "last_x_block"
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SETTING_LAST_Y_BLOCK = "last_y_block"
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)
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// x -> 0 ... 256
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//zoom/mapblock-width
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//13 1
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//12 2
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//11 4
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//10 8
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//9 16
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//Zoom 9:
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//10 mapblocks height * 16 * 16 == 2560
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func (this *PostgresAccessor) FindNextInitialBlocks(s settings.Settings, layers []*layer.Layer, limit int) (*db.InitialBlocksResult, error) {
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lastlayer := s.GetInt(SETTING_LAST_LAYER, 0)
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lastxblock := s.GetInt(SETTING_LAST_X_BLOCK, -129)
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lastyblock := s.GetInt(SETTING_LAST_Y_BLOCK, -128)
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if lastxblock >= 128 {
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lastxblock = -128
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lastyblock++
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} else {
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lastxblock++
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}
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if lastyblock > 128 {
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//done
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//TODO: next layer
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result := &db.InitialBlocksResult{}
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result.HasMore = false
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return result, nil
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}
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tc := coords.NewTileCoords(lastxblock, lastyblock, 9, lastlayer)
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currentlayer := layer.FindLayerById(layers, lastlayer)
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fromY := int(currentlayer.From / 16)
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toY := int(currentlayer.To / 16)
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tcr := coords.GetMapBlockRangeFromTile(tc, 0)
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tcr.Pos1.Y = fromY
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tcr.Pos2.Y = toY
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fields := logrus.Fields{
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"layerId": lastlayer,
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"pos1": tcr.Pos1,
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"pos2": tcr.Pos2,
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"tile": tc,
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}
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log.WithFields(fields).Info("Initial-Query")
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minX := int(math.Min(float64(tcr.Pos1.X), float64(tcr.Pos2.X)))
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maxX := int(math.Max(float64(tcr.Pos1.X), float64(tcr.Pos2.X)))
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minY := int(math.Min(float64(tcr.Pos1.Y), float64(tcr.Pos2.Y)))
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maxY := int(math.Max(float64(tcr.Pos1.Y), float64(tcr.Pos2.Y)))
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minZ := int(math.Min(float64(tcr.Pos1.Z), float64(tcr.Pos2.Z)))
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maxZ := int(math.Max(float64(tcr.Pos1.Z), float64(tcr.Pos2.Z)))
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if lastxblock <= -128 {
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//first x entry, check z stride
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stridecount := this.intQuery(`
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select count(*) from blocks
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where posz >= $1 and posz <= $2
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and posy >= $3 and posy <= $4
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and mtime = 0`,
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minZ, maxZ,
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minY, maxY,
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)
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if stridecount == 0 {
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fields = logrus.Fields{
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"minX": minX,
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"maxX": maxX,
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"minY": minY,
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"maxY": maxY,
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}
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log.WithFields(fields).Debug("Skipping stride")
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s.SetInt(SETTING_LAST_LAYER, lastlayer)
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s.SetInt(SETTING_LAST_X_BLOCK, -129)
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s.SetInt(SETTING_LAST_Y_BLOCK, lastyblock+1)
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result := &db.InitialBlocksResult{}
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result.HasMore = true
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return result, nil
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}
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}
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rows, err := this.db.Query(getBlocksByInitialTileQuery,
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minX, minY, minZ, maxX, maxY, maxZ,
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)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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blocks := make([]*db.Block, 0)
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for {
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for rows.Next() {
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var posx, posy, posz int
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var data []byte
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var mtime int64
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err = rows.Scan(&posx, &posy, &posz, &data, &mtime)
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if err != nil {
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return nil, err
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}
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mb := convertRows(posx, posy, posz, data, mtime)
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blocks = append(blocks, mb)
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}
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if !rows.NextResultSet() {
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break
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}
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}
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s.SetInt(SETTING_LAST_LAYER, lastlayer)
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s.SetInt(SETTING_LAST_X_BLOCK, lastxblock)
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s.SetInt(SETTING_LAST_Y_BLOCK, lastyblock)
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result := &db.InitialBlocksResult{}
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result.List = blocks
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result.HasMore = true
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return result, nil
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}
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