rubberbox rubberband box for rectangle selection

## Syntax

                [final_rect, btn] = rubberbox()
                [final_rect, btn] = rubberbox(initial_rect)
                [final_rect, btn] = rubberbox(edition_mode)
                [final_rect, btn] = rubberbox(initial_rect, edition_mode)

## Arguments

initial_rect

  a vector with two or four entries. With four entries it gives the initial rectangle defined by `[x_min, y_max, width, height]` (where `x_min` and `y_max` are coordinates of initial corner position, with two entries width and height are supposed to be 0.

edition_mode

  a boolean, if `edition_mode` is `%t` button press selects the first corner, release selects the opposite corner. If `edition_mode` is `%f`, a button press or click selects the first corner, a click is requested to select the opposite corner. The default value is `%f`.

final_rect

  a rectangle defined by `[x_min, y_max, width, height]`.

btn

  an integer, the number of the mouse button clicked.

## Description

`rubberbox(initial_rect)` tracks a rubberband box in the current graphic window, following the mouse. When a button is clicked `rubberbox` returns the final rectangles definition in `final_Rect`. If the argument `initial_rect` is not specified, a click is needed to fix the initial corner position.

## Examples

    clf
    plot2d()
    a = gca();
    db = a.data_bounds;
    x0 = (db(1)*2+db(2))/3;
    dx = (db(2)-db(1))/3;
    y0 = (db(3)+db(4)*2)/3;
    dy = (db(4)-db(3))/3;
    xtitle(msprintf("With an initial starting corner: x0 = %0.2f, y0 = %0.2f",x0,y0))
    r = rubberbox([x0 y0])

    clf
    plot2d()
    a = gca();
    db = a.data_bounds;
    x0 = (db(1)*2+db(2))/3;
    dx = (db(2)-db(1))/3;
    y0 = (db(3)+db(4)*2)/3;
    dy = (db(4)-db(3))/3;
    xtitle(msprintf("With an initial box: x0 = %0.2f, y0 = %0.2f, width = %0.2f, height = %0.2f,",x0-dx/4,y0+dy/5,2*dx,dy))
    r = rubberbox([x0-dx/4 y0+dy/5 2*dx dy])

    clf
    plot2d()
    a = gca();
    db = a.data_bounds;
    x0 = (db(1)*2+db(2))/3;
    dx = (db(2)-db(1))/3;
    y0 = (db(3)+db(4)*2)/3;
    dy = (db(4)-db(3))/3;
    xtitle("In press -- drag -- release mode selection:")
    r = rubberbox(%t)

    clf
    plot2d()
    a = gca();
    db = a.data_bounds;
    x0 = (db(1)*2+db(2))/3;
    dx = (db(2)-db(1))/3;
    y0 = (db(3)+db(4)*2)/3;
    dy = (db(4)-db(3))/3;
    xtitle("In starting click -- drag -- stopping click mode selection:")
    r = rubberbox()

## See also

- xrect
- xrects
- xclick
- xgetmouse
- dragrect