GrADS Command: draw button

## draw button

`draw button number xpos ypos width height string`

Draws a button centered on `xpos,ypos` with the following attributes:

`number` button number, 1 - 512
`xpos` x center of the button in page coordinates (inches)
`ypos` y center of the button in page coordinates (inches)
`width` width (x) of the button (inches)
`height` height (y) of the button (inches)
`string` text to display centered in the button

### Usage Notes

1. Button colors are specified with the `set button` command.

2. A button's initial state is `ON`. If a user clicks on a button following a `q pos` command, then the button state will switch from `ON (1)` to `OFF (0)`. A second `q pos` followed by a mouse click on the button will return it to the `ON` state.

3. The button "state" (i.e. `ON/OFF`) may also be set with the `redraw button` command.

4. See the section of the User's Guide on widgets for more information on using buttons.

### Example

    set rgb 90 100 100 100
    set rgb 91  50  50  50
    set rgb 92 200 200 200
    set button 2 90 91 92 3 90 91 92 10
    draw button  1 2.5 8.0 2.5 0.5  Click Here