Rectangle
Lets you add a rectangle field in your form
Object designer
Object parameters
Double-click on the object to edit it. Object parameters dialog will pop up.
Key
The key field lets you define a unique name to your field. Key value will be read and updated in the context
{
"rectangle": {
"x": "10",
"y": "20",
"w": "100",
"h": "200"
}
}