¡@

Home 

2014/10/16 ¤W¤È 08:12:17

android Programming Glossary: delta_y

android button selector

http://stackoverflow.com/questions/14023886/android-button-selector

Calculating the angle between the line defined by two points

http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points

clockwise from the x axis. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you.. center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you mentioned in a comment that y increases from.. comment that y increases from top to bottom. In that case delta_y center_y touch_y But it would be more correct to describe this..

rotation and scaling using multi touch in android

http://stackoverflow.com/questions/8515709/rotation-and-scaling-using-multi-touch-in-android

event double delta_x event.getX 0 event.getX 1 double delta_y event.getY 0 event.getY 1 double radians Math.atan2 delta_y.. event.getY 0 event.getY 1 double radians Math.atan2 delta_y delta_x if Constant.TRACE Log.d Rotation ~~~~~~~~~~~~~~~~~.. Constant.TRACE Log.d Rotation ~~~~~~~~~~~~~~~~~ delta_x ## delta_y ## radians ## Math.toDegrees radians return float Math.toDegrees..

android button selector

http://stackoverflow.com/questions/14023886/android-button-selector

Calculating the angle between the line defined by two points

http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points

point at the center of the screen. theta is measured counter clockwise from the x axis. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you mentioned in a comment that y increases from top to bottom... measured counter clockwise from the x axis. Then delta_x touch_x center_x delta_y touch_y center_y theta_radians atan2 delta_y delta_x Edit you mentioned in a comment that y increases from top to bottom. In that case delta_y center_y touch_y But it.. theta_radians atan2 delta_y delta_x Edit you mentioned in a comment that y increases from top to bottom. In that case delta_y center_y touch_y But it would be more correct to describe this as expressing touch_x touch_y in polar coordinates relative..

rotation and scaling using multi touch in android

http://stackoverflow.com/questions/8515709/rotation-and-scaling-using-multi-touch-in-android

between the first two fingers private float rotation MotionEvent event double delta_x event.getX 0 event.getX 1 double delta_y event.getY 0 event.getY 1 double radians Math.atan2 delta_y delta_x if Constant.TRACE Log.d Rotation ~~~~~~~~~~~~~~~~~.. event double delta_x event.getX 0 event.getX 1 double delta_y event.getY 0 event.getY 1 double radians Math.atan2 delta_y delta_x if Constant.TRACE Log.d Rotation ~~~~~~~~~~~~~~~~~ delta_x ## delta_y ## radians ## Math.toDegrees radians return.. event.getY 1 double radians Math.atan2 delta_y delta_x if Constant.TRACE Log.d Rotation ~~~~~~~~~~~~~~~~~ delta_x ## delta_y ## radians ## Math.toDegrees radians return float Math.toDegrees radians Try this code but remember some old phone have..