Graphic display device having graphic generator for shading graphs

A graphic display device for shading a region between first line and a second line by generating a plurality of shading lines, each said shading line comprising at least one lighted lattice point of said graphic display device, wherein said shading lines are generated in parallel relation to the mantissa or the ordinate of said graphic display device, comprising:

• straight line coordinates generating means for sequentially generating the coordinates of each point along said first line;
• shading line coordinates generating means, electrically connected to said straight line coordinates generating means, for counting the number of lattice points to be lighted along a selected shading line between said first line and second line and for generating the coordinates of said lattice points to be lighted;
• control means, electrically connected to said straight line generator means and said shading line coordinates generating means, for signalling said straight line coordinates generator means when said shading line coordinates generating means completes the generation of a selected shading line;
• display generating means, electrically connected to said straight line generating means and said shading line coordinates generating means, for shading the lattice points with respective coordinates designated by said straight line generating means and said shading line coordinates generating means;
• further comprising:
• detecting means, electrically connected to straight line coordinates generating means and said shading line coordinates generating means for detecting the intersection of said first line and said second line;
• count changing means, electrically connected to said detecting means and said shading line coordinates generating means, for reversing the counting direction of said shading line coordinates generating means in response to a signal from said detecting means.

A cathode ray tube (CRT) graphic display device for shading a region between a first line and a second line by generating a plurality of shading lines, each said shading line comprising at least one lighted lattice point of said graphic display device, wherein said shading lines are generated in parallel relation to the mantissa or the ordinate of said graphic display device, comprising:

• straight line coordinates generating means for sequentially generating the coordinates of each point along said first line;
• shading line coordinates generating means, electrically connected to said straight line coordinates generating means, for counting the number of lattice points to be lighted along a selected shading line between said first line and said second line and for generating the coordinates of said lattice points to be lighted;
• control means, electrically connected to said straight line generator means and said shading line coordinates generating means, for signalling said straight line coordinates generator means when said shading line coordinates generating means completes the generation of a selected shading line;
• display generating means, electrically connected to said straight line generating means and said shading line coordinates generating means, for shading the lattice points with respective coordinates designated by said straight line generating means and said shading ine coordinates generating means;
• further including:
• memory means electrically connected to said display generating means for storing lattice points data from said display generating means;
• and
• a cathode ray tube monitor means, electrically connected to said memory means, for displaying said data, whereby a plurality of cathode ray tubes may be driven.