server/player.go

package main

import (
	"bitbucket.org/hackerbots/bot"
	v "bitbucket.org/hackerbots/vector"
	"code.google.com/p/go.net/websocket"
	"log"
	"math/rand"
)

type player struct {
	ws          *websocket.Conn
	Robot       bot.Robot
	send        chan *bot.Boardstate
	Instruction bot.Instruction
}

func (p *player) sender() {
	for things := range p.send {
		err := websocket.JSON.Send(p.ws, *things)
		if err != nil {
			break
		}
	}
	p.ws.Close()
	log.Printf("player %s: sender close", p.Robot.Id)
}

func (p *player) recv() {
	for {
		// XXX: need to mark myself as having received something, also binding
		// such action to a particular game turn ID
		var msg bot.Instruction
		err := websocket.JSON.Receive(p.ws, &msg)
		if err != nil {
			// TODO: perhaps we could be a bit more precise in the handling of
			// this 'error' by selecting on some kill signal channel and this
			// json read?
			log.Print("problem receiving JSON from player: ", err)
			break
		}
		if msg.MoveTo != nil {
			p.Robot.MoveTo = msg.MoveTo
		}
		if msg.FireAt != nil {
			p.Robot.FireAt = msg.FireAt
		}
		if msg.Stats.Speed > 0 {
			p.Robot.Stats = msg.Stats
			p.Robot.Health = p.Robot.Stats.Hp
		}
	}
	log.Printf("player %s: recv close", p.Robot.Id)
	p.ws.Close()
}

func (p *player) nudge() {
	// XXX: we must take into account going past our p.Robot.MoveTo ...
	newPos := v.Move(p.Robot.Position, *p.Robot.MoveTo, p.Robot.Stats.Speed, delta)
	p.Robot.Position.X = newPos.X
	p.Robot.Position.Y = newPos.Y
}

func (p *player) scan(players map[*player]bool) {
	p.Robot.Scanners = p.Robot.Scanners[:0]
	for player, _ := range players {
		if player.Robot.Id == p.Robot.Id || player.Robot.Health <= 0 {
			continue
		}
		dist := v.Distance(player.Robot.Position, p.Robot.Position)
		if dist < float64(p.Robot.Stats.ScannerRadius) {
			s := bot.Scanner{
				Position: v.Point2d{
					X: player.Robot.Position.X,
					Y: player.Robot.Position.Y,
				},
			}
			p.Robot.Scanners = append(p.Robot.Scanners, s)
		}
	}
}

func (p *player) fire(projectiles map[*bot.Projectile]bool) *bot.Projectile {
	// XXX: is this to prevent us from having multiple projectiles from the
	// same bot?
	for proj := range projectiles {
		if proj.Id == p.Robot.Id {
			return nil
		}
	}

	return &bot.Projectile{
		Id:       p.Robot.Id,
		Position: p.Robot.Position,
		MoveTo:   *p.Robot.FireAt,
		Damage:   10,
		Radius:   p.Robot.Stats.WeaponRadius,
		Speed:    float64(p.Robot.Stats.Speed * 2),
	}
}

func (p *player) reset() {
	start_pos := v.Point2d{
		X: rand.Float64() * *width,
		Y: rand.Float64() * *height,
	}
	p.Robot.MoveTo = &start_pos
	p.Robot.Position = start_pos
	p.Robot.Health = p.Robot.Stats.Hp
}