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116 lines
2.1 KiB
Go
116 lines
2.1 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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"math"
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"math/rand"
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)
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var (
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index map[int]*System
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)
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type System struct {
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x, y, z float64
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planets int
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name string
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players map[*Connection]bool
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}
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func (s *System) Arrive(p *Connection) {
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log_info("player %s has arrived at system %s", p.PlayerName(), s.name)
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if s.players == nil {
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s.players = make(map[*Connection]bool, 8)
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}
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s.players[p] = true
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}
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func (s *System) Leave(p *Connection) {
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delete(s.players, p)
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}
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func (s *System) EachConn(fn func(*Connection)) {
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if s.players == nil {
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return
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}
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for conn, _ := range s.players {
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fn(conn)
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}
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}
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func (s *System) NumInhabitants() int {
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if s.players == nil {
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return 0
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}
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return len(s.players)
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}
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func (e System) Store(db *sql.DB) {
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_, err := db.Exec(`
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insert into planets
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(name, x, y, z, planets)
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values
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(?, ?, ?, ?, ?)
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;`, e.name, e.x, e.y, e.z, e.planets)
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if err != nil {
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log_error("%v", err)
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}
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}
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func (e System) String() string {
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return fmt.Sprintf("<name: %s x: %v y: %v z: %v planets: %v>", e.name, e.x, e.y, e.z, e.planets)
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}
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func countPlanets() (int, error) {
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row := db.QueryRow(`select count(*) from planets`)
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var n int
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err := row.Scan(&n)
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return n, err
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}
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func sq(x float64) float64 {
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return x * x
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}
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func dist3d(x1, y1, z1, x2, y2, z2 float64) float64 {
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return math.Sqrt(sq(x1-x2) + sq(y1-y2) + sq(z1-z2))
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}
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func planetDistance(p1, p2 System) float64 {
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return dist3d(p1.x, p1.y, p1.z, p2.x, p2.y, p2.z)
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}
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func indexPlanets(db *sql.DB) map[int]*System {
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rows, err := db.Query(`select * from planets`)
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if err != nil {
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log_error("unable to select all planets: %v", err)
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return nil
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}
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defer rows.Close()
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index = make(map[int]*System, 551)
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for rows.Next() {
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var id int
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p := System{}
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if err := rows.Scan(&id, &p.name, &p.x, &p.y, &p.z, &p.planets); err != nil {
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log_info("unable to scan planet row: %v", err)
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continue
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}
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index[id] = &p
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}
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return index
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}
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func randomPlanet() (*System, error) {
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n := len(index)
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if n == 0 {
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return nil, fmt.Errorf("no planets are known to exist")
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}
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pick := rand.Intn(n)
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planet := index[pick]
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return planet, nil
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}
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