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Graphic processing apparatus utilizing a CAD system

  • US 5,517,607 A
  • Filed: 08/15/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 09/30/1991
  • Status: Expired due to Term
First Claim
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1. A graphic data processor employing a CAD system, comprising:

  • an external storage unit storing a structure of design model data;

    input means for receiving an instruction through input devices;

    model managing means, coupled to the input means and to the external storage unit, comprising;

    a model area creating unit defining a model area of the model managing means and holding in the model area a design model comprising hierarchical figures, the model area creating unit formatting the design model in the model area into top layers, lower layers included in each of the top layers, figure groups included in each of the lower layers, and figures included in each of the figure groups, each of the figures comprising a figure area mask, attributes, geometric information, and letter train information, said model area creating unit accordingly producing a formatted design model, the model area holding formatted hierarchical figures comprising the design model data,a model accessing unit fetching an existing design model out of the external storage unit, storing the existing design model in the model area in a single access operation, and transferring data from the model area to the external storage unit in a single access operation,a model data retrieving unit retrieving the design model data from the model area for each of the formatted hierarchical figures, anda model updating unit adding new function figures, layers, area masks, attributes, geometric information, and letter train information to the model area, and correcting the existing design model fetched by the model accessing unit; and

    display means for displaying the formatted hierarchical figures and comprising buffering means for sorting the formatted hierarchical figures displayed on the display means according to colors, kinds, and characteristics of each of the formatted hierarchical figures to produce sorted figures and for organizing the sorted figures in the buffering means to display the design model data with minimum access time,wherein a structure of the model area corresponds to the structure of design model data stored in the external storage unit and the input means, the model managing means and the display means communicate with one another to create the design model and to correct an existing design model at high speed.

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