我正在AndEngine
上做一个游戏。我可以在Right to Left
,Top to Bottom
中移动一个对象,反之亦然。但是,我的问题是如何在Direction of Fling
中移动Sprite对象?这意味着如果用户fling在任何方向上,雪碧对象应该在纵横的协调上移动,并且应该继续前进。
如果有人能建议,如何得到确切的X and Y co-ordinates
也会做,我可以设法移动雪碧对象本人在协调。
您还可以看到视频- 海盗潜艇。
在视频中,Launcher
出现在FLING
上是我要寻找的,从任何方向。
提前谢谢。苏瑞·萨哈尼。
发布于 2011-09-16 10:41:58
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);
onFling()方法如下所示,用于所有方向。
@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;
}
发布于 2013-12-19 20:25:39
我是根据上面的例子创建的:
OnUpDownGestureListener实现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();
}
https://stackoverflow.com/questions/7320441
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