android – 如何使用AndEngine在Fling / Swipe方向(对角线)上移动Sprite

我正在开发AndEngine的游戏.在那里我能够从右到左,从上到下移动一个对象,反之亦然.但是,我的问题是如何在Fling方向中移动Sprite对象？这意味着如果用户在任何方向上甩掉Sprite对象应该在fling的坐标上移动并且应该继续前进.

如果有人可以提出建议,如何获得精确的X和Y坐标也可以,我可以设法自己在坐标上移动Sprite对象.

您还可以看到VIDEO – Pirates Subs

在视频中,来自FLING的启动器是我正在寻找的,从任何方向.

提前致谢.
苏瑞萨哈尼.

最佳答案

好吧,你可以试试这个代码……

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

c = y1 - (slope * x1);

对于所有方向,onFling()方法看起来像这样.

@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,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,(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,this.mFaceTextureRegionMissileLeftToRight);
missile.setVeLocity((float) (-600 * (Math.cos(angle))),-(float) (600 * (Math.sin(angle))));
scene.getTopLayer().addEntity(missile);
missile.setRotation(angleInDegree + 180);
}
return false;
}