func (w *World) spawnSpiders(pos *s3dm.V3) {
// Represents the gradually increasing difficulty as the player gets
// farther from the center of Spider Forest. Every time the player
// passes this threshold, another spider will definitely spawn upon
// player movement. So if the player is 173 units from the center,
// 173/50=3 spiders will spawn with a 23/50 chance to make it 4.
// The lower this number, the more difficult the game will be.
const LEVEL_DIST = 100.
// Minimum and maximum distance from the player to spawn spiders
const MIN_DIST = 40.
const MAX_DIST = 60.
// Find how many spiders will definitely spawn
dist := pos.Length()
count := 0
for dist >= LEVEL_DIST {
dist -= LEVEL_DIST
count++
}
// Random chance for a spider to spawn
if rand.Float64() <= dist/LEVEL_DIST {
count++
}
// Spawn spiders at a random point in a ring around the player
// between MIN_DIST and MAX_DIST.
reply := make(chan Msg)
for i := 0; i < count; i++ {
radius := rand.Float64()*(MAX_DIST-MIN_DIST) + MIN_DIST
angle := rand.Float64() * 2. * math.Pi
x := pos.X + radius*math.Cos(angle)
y := pos.Y + radius*math.Sin(angle)
// Create the spider entity and position it
Send(w, w.svc.Game, game.MsgSpawnEntity{InitSpider, reply})
spider := Recv(w, reply).(*EntityDesc)
Send(w, spider.Chan, MsgSetState{Position{s3dm.NewV3(x, y, 0.)}})
}
}
// Puts the passed entity in an empty position as close to pos as possible.
// TODO: Current implementation doesn't try very hard at closeness ;)
func (w *World) putInEmptyPos(ent *EntityDesc, pos *s3dm.V3) {
old_pos := pos.Copy()
for {
if _, ok := w.ents[hashV3(pos)]; !ok {
break // Empty, proceed
}
inc := &s3dm.V3{1, 1, 0}
pos = pos.Add(inc)
}
w.setPos(ent, pos, nil)
if !pos.Equals(old_pos) {
// Update with new pos
Send(w, ent.Chan, MsgSetState{Position{pos}})
}
}