Got game working again

I just moved some old code into the game struct; probably still merits some
cleanup in the main loop.

game.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bitbucket.org/hackerbots/bot"
+	v "bitbucket.org/hackerbots/vector"
 	"log"
 	"sort"
 	"time"
@@ -70,6 +71,9 @@ func (g *game) run() {
 			delete(g.spectators, s)
 			close(s.send)
 		case <-time.Tick(time.Duration(*tick) * time.Millisecond):
+			// XXX: This is very racy!! It was at bottom of loop and empty
+			// stuff was going out
+			payload.EmptySlices()
 			if started && len(g.players) == 0 {
 				g.kill <- true
 			}
@@ -91,6 +95,7 @@ func (g *game) run() {
 			for p := range g.players {
 				if p.Robot.Health > 0 {
 					robots_remaining++
+					// TODO: measure if this would be better to go and wait ...
 					p.scan(g.players)
 					p.nudge()
 					if p.Robot.FireAt != nil {
@@ -104,10 +109,9 @@ func (g *game) run() {
 			}
 			sort.Sort(bot.RobotSorter{Robots: payload.Robots})
 
-			for p := range g.projectiles {
-				// XXX: p.nudge()
-				payload.Projectiles = append(payload.Projectiles, *p)
-			}
+			payload.Projectiles = append(payload.Projectiles,
+				g.nudgeProjectiles()...,
+			)
 
 			for s := range g.splosions {
 				// XXX: s.tick()
@@ -144,8 +148,54 @@ func (g *game) run() {
 			if *verbose {
 				log.Printf("Sent Payload %v\n", t1.Sub(t0))
 			}
-
-			payload.EmptySlices()
 		}
 	}
 }
+
+func (g *game) nudgeProjectiles() (rprojectiles []bot.Projectile) {
+	for p := range g.projectiles {
+		newPos := v.Move(p.Position, p.MoveTo, float64(p.Speed), delta)
+
+		hit_player := false
+		for player := range g.players {
+			if player.Robot.Id == p.Id {
+				continue
+			}
+			dist := v.Distance(player.Robot.Position, p.Position)
+			if dist < 5.0 {
+				hit_player = true
+			}
+		}
+
+		if v.Distance(p.Position, p.MoveTo) < 5 || hit_player {
+			delete(g.projectiles, p)
+
+			// Spawn a splosion
+			splo := &bot.Splosion{
+				Id:        p.Id,
+				Position:  p.Position,
+				Radius:    p.Radius,
+				MaxDamage: 10,
+				MinDamage: 5,
+				Lifespan:  8,
+			}
+			g.splosions[splo] = true
+
+			for player := range g.players {
+				dist := v.Distance(player.Robot.Position, p.Position)
+				if dist < float64(p.Radius) {
+
+					// TODO map damage Max to Min based on distance from explosion
+					if player.Robot.Health > 0 {
+						player.Robot.Health -= p.Damage
+						if player.Robot.Health <= 0 {
+						}
+					}
+				}
+			}
+		}
+		p.Position.X = newPos.X
+		p.Position.Y = newPos.Y
+	}
+	return
+}