Abstract
An input device for graphic is disclosed in the present invention, which is adapted for editing a three-dimensional graphic displayed on a screen. The input device includes a signal transceiver module and a telescopic sensing component coupled to the signal transceiver module. The signal transceiver module is used for communicating with a graphic system and obtaining the information of a three-dimensional graphic. The signal transceiver module includes a first transceiver and a second transceiver respectively disposed on a first location and a second location of the input device for obtaining a plurality of spatial information of the input device. An expansion length of the telescopic sensing component reflects the force of the input device applied on the screen so as to adjust the length of the input device. The signal transceiver module transmits the expansion length and the spatial information to the graphic system so that the graphic system generates a virtual object on the three-dimensional graphic for simulating the state of the input device sinking in the screen.