在指定道路上移动对象

Question

我试图让这艘太空船沿着一条特定的道路行驶，当它碰到我指定的屏幕的x点和y点时，其旋转角度发生了变化，但看来这艘太空船并未沿着这条道路行驶。

enter code here
 private void menuSideShipSetup() {
        menushiptypes = 2;
        arrivaltime = 4 * 20;
        Sideship = new Bitmap[menushiptypes];
        Sideship[0] = Utils.loadImage(root,"animasyon/ship_1_1.png" );
        Sideship[1] = Utils.loadImage(root,"animasyon/ship_2_1.png" );
        sideshipx = 0;
        sideshipy = 1920 / 2 - Sideship [0].getHeight() /2;
        rightsideshipx = 880;
        rightsideshipy = 1920 / 2 - Sideship[1].getHeight() /2;
        sideshipspeed = 1080 / 80;
        rotateconstantly += (135 - 45) / arrivaltime;
        sideshiprotation = -1;
        rightsideshiprotation = 1;
        rightsideshiprotationy = 1;
 private void RightShipMovement() {
        if ( rightsideshipx >= 880 || rightsideshipx  <=0 ){
            rightsideshiprotation = rightsideshiprotation * -1;
        }
        rightsideshipx += sideshipspeed * rightsideshiprotation;
        rotateconstantly += (135 - 45) / arrivaltime;

    }
    enter code here
    private void rightVerticalMovement(){
        if ((rightsideshipy >= 1260 )){
            rightsideshiprotationy = rightsideshiprotationy * -1;
        }
        rightsideshipy += (300/35) * rightsideshiprotationy;
    }
    private void rightVertical2Movement(){
        if ((rightsideshipy <= 320)){
            rightsideshiprotationy = rightsideshiprotationy * -1;
        }
        rightsideshipy += (300/35) * rightsideshiprotationy;

    }
    enter code here
    }
    enter code here