| 摘要 |
The present invention relates to an electronic design device having a data input device, a data processing device, an output device and a data memory holding a computer-processable surface model which describes the surface of a three-dimensional object. The design device is designed so that it generates a curve and displays it on the output device. This curve includes a fixed section and a freely movable section which is connected to the fixed section at a connection point. A partial section of the freely movable section is selectable based on information entered via the data input device. After receiving a fix command, the device projects a selected partial section in a predefined direction of projection onto the surface model and fixes this projected partial section. It joins the projected partial section to the fixed section to form an extended fixed section. The device automatically ensures that at every instant the fixed section of the curve generated extends across the predefined surface model.
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