the-cannon-2_part2_createBullet.ts

// FACTORY
createBullet(position: cc.Vec2, velocity: number, angle: number) {
    const newBullet = cc.instantiate(this.bullet) // 1
    newBullet.setPosition(position) // 2
    newBullet.rotation = angle

    const body = newBullet.getComponent(cc.RigidBody) // 3
    body.linearVelocity = cc.v2(MathUtilities.sind(angle) * velocity,
                                MathUtilities.cosd(angle) * velocity)
    
    this.node.addChild(newBullet) // 4
}