Graphic image drawing device

A graphic image drawing device comprising:

• first computing means for obtaining graphic data representative of a line segment defined by a length between two given points and a width;
• first storage means for storing first graphic data representative of a first line segment and second graphic data representative of a second line segment, both the first and second graphic data being obtained by said first computing means, the first line segment having first and second side lines equal in length to a length of the first line segment and the second line segment having first and second side lines equal in length to a length of the second line segment wherein the first and second line segments intersect at respective ends thereof;
• second computing means for obtaining first graphic data representative of a first extended graphic segment formed by extending the first and second side lines of the first line segment in a direction to intersect extended first and second side lines of the second line segment and second graphic data representative of a second extended graphic segment formed by extending the first and second side lines of the second line segment in a direction to intersect the extended first and second side lines of the first line segment based on the first and second graphic data stored in said first storage means;
• second storage means for storing the first and second graphic data obtained by said second computing means;
• extracting means for extracting graphic data representative of an overlapped graphic segment of the first and second extended graphic segments based on the first and second graphic data stored in said second storage means;
• and
• drawing means for drawing a graphic image based on the first and second graphic data stored in said first storage means and the graphic data extracted by said extracting means.