I'm trying to use vectors to make an enemy track a target (player's ship). However, I keep getting Error 1046. Any advice? The error occurs on the line containing the drawForceVector function in the Game.as file.
Here is my Game.as file code:
package{
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.Vector3D;
import flash.text.TextField;
public class Game extends MovieClip
{
public static var mouse :Vector3D = new Vector3D(100, 100);
public var boids :Vector.<Boid> = new Vector.<Boid>;
public var forces :Sprite;
public function Game() {
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e :Event) :void {
var i :int, boid :Boid;
for (i = 0; i < 2; i++) {
boid = new Boid(stage.stageWidth * Math.random(), stage.stageHeight * Math.random(), 20 + Math.random() * 20);
addChild(boid);
boids.push(boid);
}
forces = new Sprite();
addChild(forces);
}
public function update():void {
var i :int;
forces.graphics.clear();
for (i = 0; i < boids.length; i++) {
boids[i].update();
drawForces(boids[i]);
}
}
private function drawForces(boid :Boid) :void {
var desired :Vector3D = boid.desired.clone();
var velocity :Vector3D = boid.velocity.clone();
var steering :Vector3D = boid.steering.clone();
velocity.normalize();
desired.normalize();
steering.normalize();
// Force vectors
drawForceVector(boid, velocity, 0x00FF00);
drawForceVector(boid, desired, 0x454545);
drawForceVector(boid, steering, 0x0000FF);
// Target
forces.graphics.lineStyle(1, 0x323232);
forces.graphics.beginFill(0x323232);
forces.graphics.drawCircle(mouse.x, mouse.y, 10);
forces.graphics.endFill();
}
private function drawForceVector(boid :Boid, force :Vector3D, color :uint, scale :Number = 100) :void { //ERROR OCCURS ON THIS LINE
forces.graphics.moveTo(boid.x + boid.width / 2, boid.y + boid.height / 2);
forces.graphics.lineStyle(2, color);
forces.graphics.lineTo(boid.x + force.x * scale, boid.y + force.y * scale);
}
}
}
Boid.as Code:
package {
import flash.display.MovieClip;
import flash.geom.Vector3D;
import flash.object.Vector3D;
public class Boid extends MovieClip
{
public static const MAX_FORCE :Number = 0.4;
public static const MAX_VELOCITY :Number = 3;
public var position :Vector3D;
public var velocity :Vector3D;
public var target :Vector3D;
public var desired :Vector3D;
public var steering :Vector3D;
public var mass :Number;
public function Boid(posX :Number, posY :Number, totalMass :Number = 20) {
position = new Vector3D(posX, posY);
velocity = new Vector3D(-1, -2);
target = new Vector3D(310, 240);
desired = new Vector3D(0, 0);
steering = new Vector3D(0, 0);
mass = totalMass;
truncate(velocity, MAX_VELOCITY);
x = position.x;
y = position.y;
graphics.beginFill(0xFF0000);
graphics.drawRect(0, 0, 20, 20);
graphics.endFill();
}
private function seek(target :Vector3D) :Vector3D {
var force :Vector3D;
desired = target.subtract(position);
desired.normalize();
desired.scaleBy(MAX_VELOCITY);
force = desired.subtract(velocity);
return force;
}
public function truncate(vector :Vector3D, max :Number) :void {
var i :Number;
i = max / vector.length;
i = i < 1.0 ? 1.0 : i;
vector.scaleBy(i);
}
public function update():void {
target = Game.mouse;
steering = seek(target);
truncate(steering, MAX_FORCE);
steering.scaleBy(1 / mass);
velocity = velocity.add(steering);
truncate(velocity, MAX_VELOCITY);
position = position.add(velocity);
x = position.x;
y = position.y;
}
}
}
Main.as Code:
package {
import flash.display.Sprite;
import flash.events.*;
[SWF(width = "600", height = "480")]
public class Main extends Sprite
{
private var game :Game = new Game();
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
stage.addEventListener(Event.ENTER_FRAME, enterFrame);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
stage.frameRate = 30;
addChild(game);
}
private function mouseMove(e :MouseEvent) :void {
Game.mouse.x = e.stageX;
Game.mouse.y = e.stageY;
}
private function enterFrame(e :Event) :void {
game.update();
}
}
}
Thank you very much.
The target version of the player must be higher than the one you've got - Flash Player 9. As seen by the reference, it's said that Vector3D is included in: Runtime Versions: Flash Player 10, AIR 1.5. So basically you are building for so old Flash Player, that it still doesn't have this class inside it.
Simply change the target version to the latest possible one, and be sure it's higher than Flash Player 10. That will do the job! :)