Declaration [src]

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.


event2 GdkEvent

Second GdkEvent

 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.

Return value

Returns: gboolean

TRUE if the angle could be calculated.