Function
Gdkevents_get_angle
Declaration [src]
gboolean
gdk_events_get_angle (
  GdkEvent* event1,
  GdkEvent* event2,
  double* angle
)
Description [src]
Returns the relative angle from event1 to event2.
The relative angle is the angle between the X axis and the line through both events’ positions. The rotation direction for positive angles is from the positive X axis towards the positive Y axis.
This assumes that both events have X/Y information.
If not, this function returns FALSE.
Parameters
| event1 | GdkEvent | 
| First  | |
| The data is owned by the caller of the function. | |
| event2 | GdkEvent | 
| Second  | |
| The data is owned by the caller of the function. | |
| angle | double* | 
| Return location for the relative angle between both events. | |
| The argument will be set by the function. | |
| The called function takes ownership of the data, and is responsible for freeing it. |