Herror ::draw_ellipse_mod (
const HTuple &WindowHandle,
const HTuple &RowIn,
const HTuple &ColumnIn,
const HTuple &PhiIn,
const HTuple &Radius1In,
const HTuple &Radius2In,
double *Row,
double *Column,
double *Phi,
double *Radius1,
double *Radius2
)
HTuple HWindow::DrawEllipseMod (
const HTuple &RowIn,
const HTuple &ColumnIn,
const HTuple &PhiIn,
const HTuple &Radius1In,
const HTuple &Radius2In,
HTuple *Column,
HTuple *Phi,
HTuple *Radius1,
HTuple *Radius2
) const
Interactive drawing of an ellipse.
::draw_ellipse_mod returns the parameter for any orientated ellipse, which
has been created interactively by the user in the window.
The created ellipse is described by its center, its two half axes and the angle
between the first half axis and the horizontal coordinate axis.
To create an ellipse are expected the parameters RowIn,
ColumnIn,PhiIn,Radius1In,Radius2In.
Keeping the button pressed determines the length (Radius1)
and the orientation (Phi) of the first half axis.
In doing so a temporary default length for the second half axis is assumed, which may be
modified afterwards on demand.
After another mouse click in the center of the created ellipse you can move it.
A mouse click close to a vertex ``grips'' it to modify the length of the appropriate
half axis. You may modify the orientation only, if a vertex of the first half axis is
gripped.
Pressing the right mouse button terminates the procedure.
After terminating the procedure the ellipse is not visible in the window any longer.
Parameters
WindowHandle (input_control)
|
window -> HTuple.long
|
|
Window_id. |
RowIn (input_control)
|
ellipse.center.y -> HTuple.double
|
|
Row index of the barycenter. |
ColumnIn (input_control)
|
ellipse.center.x -> HTuple.double
|
|
Column index of the barycenter. |
PhiIn (input_control)
|
ellipse.angle.rad -> HTuple.double
|
|
Orientation of the bigger half axis in radians. |
Radius1In (input_control)
|
ellipse.radius1 -> HTuple.double
|
|
Bigger half axis. |
Radius2In (input_control)
|
ellipse.radius1 -> HTuple.double
|
|
Smaller half axis. |
Row (output_control)
|
ellipse.center.y -> double *
|
|
Row index of the center. |
Column (output_control)
|
ellipse.center.x -> double *
|
|
Column index of the center. |
Phi (output_control)
|
ellipse.angle.rad -> double *
|
|
Orientation of the first half axis in radians. |
Radius1 (output_control)
|
ellipse.radius1 -> double *
|
|
First half axis. |
Radius2 (output_control)
|
ellipse.radius2 -> double *
|
|
Second half axis. |
Example
read_image(&Image,"affe") ;
draw_ellipse_mod(WindowHandle,RowIn,ColumnIn,PhiIn,Radius1In,Radius2In,&Row,&Column,&Phi,&Radius1,&Radius2) ;
gen_ellipse(&Ellipse,Row,Column,Phi,Radius1,Radius2) ;
reduce_domain(Image,Ellipse,&GrayEllipse) ;
sobel_amp(GrayEllipse,&Sobel,"sum_abs",3) ;
disp_image(Sobel,WindowHandle) ;
Result
::draw_ellipse_mod returns H_MSG_TRUE, if the window is valid and the
needed drawing mode (see ::set_insert) is available.
If necessary, an exception handling is raised.
Possible Predecessors
::open_window
Possible Successors
::reduce_domain,
::disp_region,
::set_colored,
::set_line_width,
::set_draw,
::set_insert
Alternatives
::draw_ellipse,
::draw_circle,
::draw_region
See also
::gen_ellipse,
::draw_rectangle1,
::draw_rectangle2,
::draw_polygon,
::set_insert
Module
System
Copyright © 1996-2002 MVTec Software GmbH