微信小游戏 摇杆开发

代码下载地址：https://gitee.com/wolfdong7/cocos_joystick

this.stick.on(cc.Node.EventType.TOUCH_MOVE, function (e) {
            console.log('touch move');
            // 获取触摸的位置
            var w_pos = e.getLocation();
            var pos = this.node.convertToNodeSpaceAR(w_pos);
            var len = pos.mag();//返回该向量的长度
            this.stick_dir.x = pos.x / len;
            this.stick_dir.y = pos.y / len;
            //不让其移出圆圈
            if (len > this.max_r) {
                pos.x = this.max_r * pos.x / len;
                pos.y = this.max_r * pos.y / len;
            }

            this.stick.setPosition(pos);
        }, this);

update (dt) {
        if (this.joy_stick_script.stick_dir.mag() < 0.5) {
            return;
        }
       
        var vx = this.joy_stick_script.stick_dir.x * this.speed; // cos(r)
        
        var vy = this.joy_stick_script.stick_dir.y * this.speed; // sin(r)
       
        var sx = vx * dt;
        var sy = vy * dt;
        
        this.node.x += sx;
        this.node.y += sy;

        /**
            x=Math.atan2(1,1)
            x=180*x/Math.PI//转换为角度值
            trace(x)//输出:45
         */
        var r = Math.atan2(this.joy_stick_script.stick_dir.y,this.joy_stick_script.stick_dir.x);
        var degree = r * 180 / Math.PI;
        degree = 360 - degree +90;

        this.node.rotation = degree;
    }