the-cannon-2_part2_createMeteor.ts

@ccclass
export default class Game extends cc.Component {

    @property(cc.Prefab)
    meteor: cc.Prefab = null

    start() {
        this.scheduleCreateMeteor()
    }
    
    createMeteor() {
        const x = this.randInRange(this.meteorSpawnMinX, this.meteorSpawnMaxX)
        const y = this.randInRange(this.meteorSpawnMinY, this.meteorSpawnMaxY)
        const angle = Math.random() * 360
        const velocity = this.randInRange(this.meteorMinVelocity, this.meteorMaxVelocity)

        const node = cc.instantiate(this.meteor)

        node.setPosition(cc.v2(x, y))

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

    scheduleCreateMeteor() {
        cc.director.getScheduler().schedule(this.createMeteor, this, 1 + Math.random(), false);
    }

    // UTILITIES
    randInRange(min: number, max: number): number {
        return Math.random() * (max - min) + min;
    }

}