Function

Gdk.events_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 GdkEvent

 Ownership is not transferred to the callee
event2 GdkEvent
 

second GdkEvent

 Ownership is not transferred to the callee
angle double*
 

return location for the relative angle between both events

 Direction: out
 Ownership of the data is transferred to the callee

Return value

Returns: gboolean

TRUE if the angle could be calculated.