| 摘要 |
In a system and a method, a first user input corresponding to a first graphical shape having first boundaries, a first size, and a first position is received on an initial virtual whiteboard having an infinite drawing area and occupying a display area of a user interface. In response to a first command, the first graphical shape is designated as a current virtual whiteboard by resizing the first graphical shape from the first size to a second size, with the second size being equal to the display area of the user interface, and with the first graphical shape having the first boundaries removed to effect an infinite drawing area within the first graphical shape. A second user input corresponding to a second graphical shape is received within the first graphical shape designated as the current virtual whiteboard. In response to a second command, the initial virtual whiteboard is designated as the current virtual whiteboard by restoring the first position and the first size of the first graphical shape within the initial virtual whiteboard and by resizing and re-positioning the second graphical shape to fit within the first graphical shape.
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