imline() - Image Processing

h = imline begins interactive placement
of a line on the current axes. The function returns h,
a handle to an imline object. The line has a context
menu associated with it that controls aspects of its appearance and
behavior—see Interactive Behavior. Right-click on the line to access
this  context menu.h = imline(hparent) begins
interactive placement of a line on the object specified by hparent. hparent specifies
the HG parent of the line graphics, which is typically an axes but
can also be any other object that can be the parent of an hggrouph = imline(hparent, position) creates
a draggable, resizable line on the object specified by hparent. position is
a 2-by-2 array that specifies the initial endpoint positions of the
line in the form [X1 Y1; X2 Y2].h = imline(hparent, x, y) creates
a line on the object specified by hparent. x and y are
two-element vectors that specify the initial endpoint positions of
the line in the form x = [X1 X2], y = [Y1 Y2].h = imline(..., param1, val1,...) creates
a draggable, resizable line, specifying parameters and corresponding
values that control the behavior of the line. The following tables
lists the parameter available. Parameter names can be abbreviated,
and case does not matter.ParameterDescription
'PositionConstraintFcn'Function handle fcn that is called
whenever the object is dragged using the mouse. You can use this function
to control where the line can be dragged. See the help for the setPositionConstraintFcn method for information
about valid function handles. 
Interactive BehaviorWhen you call imline with an interactive
syntax, the pointer changes to a cross hairs 
when over the image. Click
and drag the mouse to specify the position and length of the line.
The line supports a context menu that you can use to control aspects
of its appearance and behavior. For more information about these interactive
features, see the following table.
Interactive BehaviorDescription
Moving the line.Move the pointer over the line. The pointer changes to a fleur
shape 
.
Click and drag the mouse to move the line. 
Moving the endpoints of the line.Move the pointer over either end of the line. The pointer changes
to the pointing finger, 
. Click and drag the mouse to resize
the line. 
Changing the color used to display the line. Move the pointer over the line. Right-click and select Set
Color from the context menu. 
Retrieving the coordinates of the endpoints of the line.Move the pointer over the line. Right-click and select Copy
Position from the context menu. imline copies
a 2-by-2 array to the clipboard specifying the coordinates of the
endpoints of the line in the form [X1 Y1; X2 Y2].
Deleting the lineMove the pointer on top of the line. Right-click and select Delete  from
the context menu. To remove this option from the context menu, set
the Deletable property to false: h = imline();
h.Deletable = false;
MethodsEach imline object supports a number of methods.
Type methods imline to see a list of the methods.addNewPositionCallback — Add new-position callback to ROI  objectSee imroi for information.delete — Delete ROI objectSee imroi for information.getColor — Get color used to draw ROI object.See imroi for information.getPosition — Return current position of lineReturns the endpoint positions of the line.pos = api.getPosition()pos is a 2-by-2 array [X1 Y1; X2
Y2].getPositionConstraintFcn — Return function handle to current  position constraint functionSee imroi for information.removeNewPositionCallback — Remove new-position callback
from  ROI object.See imroi for information.resume — Resume execution of MATLAB command lineSee imroi for information.setColor — Set color used to draw ROI objectSee imroi for information.setConstrainedPosition — Set ROI object to new positionSee imroi for information.setPosition — Set line to new positionsetPosition(h,pos) sets the line h to
a new position. The new position, pos, has the
form, [X1 Y1; X2 Y2]. setPosition(h,x,y) sets the line h to
a new position. x and y specify
the endpoint positions of the line in the form x = [x1 x2],
y = [y1 y2].setPositionConstraintFcn — Set position constraint function of  ROI object.See imroi for information.wait — Block MATLAB command line until ROI creation
is  finishedSee imroi for information.

Syntax

h = imlineh = imline(hparent)h = imline(hparent, position)h = imline(hparent, x, y)h = imline(..., param1, val1,...)

Example

pos = api.getPosition()

Output / Return Value

Limitations

Alternatives / See Also

Reference