How to move Sprite in the direction of Fling / Swipe (diagonally) with AndEngine

Question

I am working on a game at AndEngine. In this, I can move the object in Right to Left, Top to Bottomand vice versa. But, my problem is that how can I move a Sprite object in Direction of Fling? This means that if Fling users in any direction, the Sprite Object must move along the throw coordinates and must move on.

If anyone can suggest how to get accurate X and Y co-ordinates, I can also move the Sprite object to the coordinates.

You can also see VIDEO - Pirate Subscriptions

In the video Launchergoing to FLING, I’m looking from any direction.

Thanks at Advance. Suri Sahani.

Answer 1

Well, you can try this code .....

float slope = (y2 - y1) / (x2 - x1);
float angle = (float) Math.atan(slope);
float angleInDegree = (float) Math.toDegrees(angle);

c = y1 - (slope * x1);

the onFling () method looks like this for the whole direction.

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {

float c;
// Checks if LifeLine is there or not and enable or disable Fling
// Operation.
float sx = 0, sy = 0;
float x1 = e1.getX();
float y1 = e1.getY();

float x2 = e2.getX();
float y2 = e2.getY();

float slope = (y2 - y1) / (x2 - x1);
float angle = (float) Math.atan(slope);
float angleInDegree = (float) Math.toDegrees(angle);

c = y1 - (slope * x1);

/**
* bottom right to left top
*/
if (x1 > x2 && y1 > y2) {
sx = CAMERA_WIDTH;
sy = (slope * sx) + c;

missile = new Missile(sx, sy,
this.mFaceTextureRegionMissileLeftToRight);
missile.setVelocity(-(float) (600 * (Math.cos(angle))),
-(float) (600 * (Math.sin(angle))));

scene.getTopLayer().addEntity(missile);

missile.setRotation(angleInDegree + 180);

}
/**
* left top corner to right
*/
else if (x2 > x1 && y2 > y1) {
sx = -100;
sy = (slope * sx) + c;
missile = new Missile(sx, sy,
this.mFaceTextureRegionMissileLeftToRight);
missile.setVelocity((float) (300 * (Math.cos(angle))),
(float) (300 * (Math.sin(angle))));
scene.getTopLayer().addEntity(missile);
missile.setRotation(angleInDegree);
}
/**
* left bottom corner to right up
*/
else if (x2 > x1 && y1 > y2) {
sx = -100;
sy = (slope * sx) + c;
missile = new Missile(sx, sy,
this.mFaceTextureRegionMissileLeftToRight);
missile.setVelocity((float) (300 * (Math.cos(angle))),
(float) (300 * (Math.sin(angle))));
scene.getTopLayer().addEntity(missile);
missile.setRotation(angleInDegree);
}

/**
* Right corner to left bottom down
*/
else if (x1 > x2 && y2 > y1) {
sx = CAMERA_WIDTH;
sy = (slope * sx) + c;
missile = new Missile(sx, sy,
this.mFaceTextureRegionMissileLeftToRight);
missile.setVelocity((float) (-600 * (Math.cos(angle))),
-(float) (600 * (Math.sin(angle))));
scene.getTopLayer().addEntity(missile);
missile.setRotation(angleInDegree + 180);
}
return false;
}

Answer 2

I created this using the example above:

The public abstract class OnUpDownGestureListener implements OnTouchListener {

private final GestureDetector gdt = new GestureDetector(new GestureListener());

@Override
public boolean onTouch(final View v, final MotionEvent event) {
    gdt.onTouchEvent(event);
    return true;
}

private final class GestureListener extends SimpleOnGestureListener {


    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        click();
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

        float x1 = e1.getX();
        float y1 = e1.getY();

        float x2 = e2.getX();
        float y2 = e2.getY();


        /**
         * bottom right to left top
         */
        if (x1 > x2 && y1 > y2) {
            onBottomToTop();

        }
        /**
         * left top corner to right
         */
        else if (x2 > x1 && y2 > y1) {
            onTopToBottom();
        }
        /**
         * left bottom corner to right up
         */
        else if (x2 > x1 && y1 > y2) {
            onBottomToTop();
        }

        /**
         * Right corner to left bottom down
         */
        else if (x1 > x2 && y2 > y1) {
            onTopToBottom();
        }
        return false;
    }
}

public abstract void onRightToLeft();

public abstract void click();

public abstract void onLeftToRight();

public abstract void onBottomToTop();

public abstract void onTopToBottom();

}