Version 5.0 The LEDA User Manual

int W.read mouse arc(double x 0 , double y 0 , double x 1 , double y 1 , double& x,
double& y)
displays an arc that starts in (x 0 , y 0 ), ends in (x 1 , y 1 ) and
passes through the current cursor position. When a mouse
button is pressed inside the drawing section of W , the
current position is assigned to (x, y) and the number of
the pressed button is returned.
int W.read mouse arc(const point& p, const point& q, point& r)
as above with (x0, y0) = p and (x1, y1) = q and the current
position is assigned to r.
int W.get mouse( ) non-blocking read operation, i.e., if a button was
pressed its number is returned, otherwise the constant
NO BUTTON is returned.
int W.get mouse(double& x, double& y)
if a mouse button was pressed the corresponding position
is assigned to (x, y) and the button number is returned,
otherwise the constant NO BUTTON is returned.
int
W.get mouse(point& p) if a mouse button was pressed the corresponding position is
assigned to p and the button number is returned, otherwise
the constant NO BUTTON is returned.
int W.read mouse(double x 0 , double y 0 , int timeout1 , int timeout2 ,
bool& double click, bool& drag)
...
int
W.read mouse(const point& p, int timeout1 , int timeout2 , bool& double click,
bool& drag)
...
3.5.2 Events
int W.read event(int& val, double& x, double& y, unsigned long& t)
waits for next event in window W and returns it. Assigns
the button or key to val, the position in W to
(x, y), and the time stamp of the event to t. Possible
events are (cf. ):
key press event, key release event, button press event,
button release event, configure event, motion event, destroy
event.
int
W.read event(int& val, double& x, double& y, unsigned long& t, int timeout)
as above, but waits only timeout milliseconds; if no event
occured the special event no event is returned.