simplest shooting algo

robot.go

@@ -6,11 +6,13 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"math"
 	"math/rand"
 	"sync"
 )
 
 const maxSpeed = 100
+const safeDistance = 20
 
 func connect(server string, port int) (*websocket.Conn, error) {
 	origin := "http://localhost/"
@@ -29,9 +31,11 @@ type robot struct {
 
 	speed          float32
 	moveto         *govector.Point2d
+	fireat         *govector.Point2d
 	boardstate     Boardstate
 	me             Robot
 	knownObstacles map[string]Obstacle
+	nearestEnemy   *OtherRobot
 
 	// TODO: don't know if I like how this is done ... I would rather send
 	// a signal over a chanel
@@ -143,7 +147,7 @@ func (r *robot) play() {
 			r.me.Id: {
 				MoveTo:      r.moveto,
 				TargetSpeed: &r.speed,
-				// FireAt: moveto,
+				FireAt:      r.fireat,
 			},
 		}
 		err = websocket.JSON.Send(r.ws, instruction)
@@ -160,6 +164,23 @@ func (r *robot) recon() {
 			r.knownObstacles[o.id()] = o.toObstacle()
 		}
 	}
+
+	// simplest shooting strategy ... need to do the following:
+	// not shoot through buildings
+	// shoot at where the robot will be, not where it was.
+	r.nearestEnemy = nil
+	r.fireat = nil
+	closest := float32(math.Inf(1))
+	for _, enemy := range r.boardstate.OtherRobots {
+		dist := r.me.Position.Sub(enemy.Position).Mag()
+		if dist < closest && dist > safeDistance {
+			r.nearestEnemy = &enemy
+		}
+	}
+	if r.nearestEnemy != nil {
+		point := r.nearestEnemy.Position.Add(r.nearestEnemy.Heading.Scale(20))
+		r.fireat = &point
+	}
 }
 
 func (r *robot) selectDirection() *govector.Point2d {