Adding collisions and acceleration. Fixing splosions and projectiles.

game.go

@@ -92,7 +92,7 @@ func (g *game) run() {
 					robots_remaining++
 					// TODO: measure if this would be better to go and wait ...
 					p.scan(g.players)
-					p.nudge()
+					p.nudge(g)
 					if p.Robot.FireAt != nil {
 						proj := p.fire(g.projectiles)
 						if proj != nil {
@@ -109,7 +109,10 @@ func (g *game) run() {
 			)
 
 			for s := range g.splosions {
-				// XXX: s.tick()
+				s.Tick()
+				if !s.Alive() {
+					delete(g.splosions, s)
+				}
 				payload.Splosions = append(payload.Splosions, *s)
 			}
 
@@ -148,6 +151,7 @@ func (g *game) run() {
 }
 
 func (g *game) nudgeProjectiles() (rprojectiles []bot.Projectile) {
+	rprojectiles = make([]bot.Projectile, 0)
 	for p := range g.projectiles {
 		newPos := v.Move(p.Position, p.MoveTo, float64(p.Speed), delta)
 
@@ -191,6 +195,8 @@ func (g *game) nudgeProjectiles() (rprojectiles []bot.Projectile) {
 		}
 		p.Position.X = newPos.X
 		p.Position.Y = newPos.Y
+		rprojectiles = append(rprojectiles, *p)
 	}
+
 	return
 }

player.go

@@ -5,6 +5,7 @@ import (
 	v "bitbucket.org/hackerbots/vector"
 	"code.google.com/p/go.net/websocket"
 	"log"
+	"math"
 	"math/rand"
 )
 
@@ -45,20 +46,86 @@ func (p *player) recv() {
 		if msg.FireAt != nil {
 			p.Robot.FireAt = msg.FireAt
 		}
+
+		p.Robot.TargetSpeed = p.Robot.Stats.Speed
+
 		if msg.Stats.Speed > 0 {
 			p.Robot.Stats = msg.Stats
+
+			log.Printf("%v\n", msg.Stats)
+
 			p.Robot.Health = p.Robot.Stats.Hp
+			p.Robot.Speed = 0
+			p.Robot.TargetSpeed = p.Robot.Stats.Speed
 		}
 	}
 	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) check_collisions(g *game, move_vector v.Vector2d) (bool, v.Point2d) {
+	collision := false
+	intersection_point := v.Point2d{X: 0, Y: 0}
+
+	// Check Walls
+	r_walls := v.Rect2d{A: v.Point2d{X: 0, Y: 0}, B: v.Point2d{X: g.width, Y: g.height}}
+	collision, _, pos := v.RectIntersection(r_walls, p.Robot.Position, move_vector)
+	if collision {
+		return collision, pos
+	}
+
+	// Check Other Bots
+
+	// Check Terrain
+	// TBD
+
+	return collision, intersection_point
+}
+
+func (p *player) nudge(g *game) {
+
+	// Adjust Speed
+	if p.Robot.Speed < p.Robot.TargetSpeed {
+		p.Robot.Speed += (p.Robot.Stats.Acceleration * delta)
+	} else if (p.Robot.Speed - p.Robot.TargetSpeed) > v.Epsilon {
+		p.Robot.Speed -= (p.Robot.Stats.Acceleration * delta)
+	} else {
+		p.Robot.Speed = p.Robot.TargetSpeed
+	}
+
+	// Adjust Heading
+	current_heading := p.Robot.Heading
+	if current_heading.Mag() == 0 {
+		// We may have been stopped before this and had no heading
+		current_heading = p.Robot.MoveTo.Sub(p.Robot.Position).Normalize()
+	}
+	new_heading := p.Robot.MoveTo.Sub(p.Robot.Position).Normalize()
+	// Is our direction change too much? Hard coding to 5 degrees/s for now
+	angle := v.Angle(current_heading, new_heading) * v.Rad2deg
+	dir := 1.0
+	if angle < 0 {
+		dir = -1.0
+	}
+	if math.Abs(angle) > (100 * delta) {
+		// New heading should be a little less, take current heading and
+		// rotate by the max turn radius per frame.
+		rot := (100 * delta) * v.Deg2rad
+
+		new_heading = current_heading.Rotate(rot * dir)
+	}
+
+	move_vector := new_heading.Scale(p.Robot.Speed * delta)
+	collision, _ := p.check_collisions(g, move_vector)
+	if collision {
+		// p.Robot.Position = intersection_point
+		p.Robot.Speed = 0
+		p.Robot.MoveTo = &p.Robot.Position
+		p.Robot.Health -= 5
+		p.Robot.Heading = v.Vector2d{X: 0, Y: 0}
+	} else {
+		p.Robot.Position = p.Robot.Position.Add(move_vector)
+		p.Robot.Heading = new_heading
+	}
 }
 
 func (p *player) scan(players map[*player]bool) {