attackOnTarget: function (atkDir, targetPos) {

        var self = this;

        let deg = cc.radiansToDegrees(cc.pAngleSigned(cc.p(0, 1), atkDir));

        let angleDivider = [0, 12, 35, 56, 79, 101, 124, 146, 168, 180];

        function getAtkSF(mag, sfAtkDirs) {

            let atkSF = null;

            for (let i = 1; i < angleDivider.length; ++i) {

                let min = angleDivider[i - 1];

                let max = angleDivider[i];

                if (mag <= max && mag > min) {

                    atkSF = sfAtkDirs[i - 1];

                    self.nextPoseSF = self.sfPostAtks[Math.floor(( i - 1 )/3)];

                    return atkSF;

                }

            }

            if (atkSF === null) {

                console.error('cannot find correct attack pose sprite frame! mag: ' + mag);

                return null;

            }

        }

        let mag = Math.abs(deg);

        if (deg <= 0) {

            this.spPlayer.node.scaleX = 1;

            this.spPlayer.spriteFrame = getAtkSF(mag, this.sfAtkDirs);

        } else {

            this.spPlayer.node.scaleX = -1;

            this.spPlayer.spriteFrame = getAtkSF(mag, this.sfAtkDirs);

        }

        let moveAction = cc.moveTo(this.atkDuration, targetPos).easing(cc.easeQuinticActionOut());

        let callback = cc.callFunc(this.onAtkFinished, this);

        this.node.runAction(cc.sequence(moveAction, callback));

        this.inputEnabled = false;

        this.isAttacking = true;

    },