Display system for displaying maps having two-dimensional roads
First Claim
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1. In a method for displaying drawings which consists of intersecting line segment representations, a method for converting input data defining one-dimensional line segment representations having length but no width into data defining two-dimensional representations having length and width, comprising the steps of:
- generating definitions of pairs of lines parallel to the lines defined by the input data;
identifying points of intersection of the lines defined by said generated definitions; and
combining the identified points of intersection with the generated definitions to establish the end points of said pairs of lines, said pairs of lines comprising the two-dimensional representations.
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Abstract
Method and apparatus for displaying maps on which the roads have width as well as length. The input to the system is a list of end points of line segments. The system operates upon this list to create a new set of line segment end points, defining two line segments for each one of the input line segments. The new line segments define roads having a predetermined width.
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Citations
10 Claims
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1. In a method for displaying drawings which consists of intersecting line segment representations, a method for converting input data defining one-dimensional line segment representations having length but no width into data defining two-dimensional representations having length and width, comprising the steps of:
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generating definitions of pairs of lines parallel to the lines defined by the input data; identifying points of intersection of the lines defined by said generated definitions; and combining the identified points of intersection with the generated definitions to establish the end points of said pairs of lines, said pairs of lines comprising the two-dimensional representations. - View Dependent Claims (2)
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3. In a method for displaying drawings which consist of intersecting line segment representations, a method for converting input data defining one-dimensional line segment representations having length but no width into data defining two-dimensional representations having length and width, comprising the steps of:
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accessing a first table containing said input data; creating a second table of definitions of two-dimensional representations associated with the one-dimensional line segment representations defined in said first table; deriving, from said first table, a list of all one-dimensional line segment representations that meet at a chosen point; ordering the lines in said derived list in a predetermined manner; calculating points of intersection of representations defined in said second table that are associated with line segment representations in said derived list; and placing said points of intersection into said second table as part of said definitions of two-dimensional representations. - View Dependent Claims (4, 5)
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6. In apparatus for displaying drawings which consist of intersecting line segment representations, means for converting input data defining one-dimensional line segment representations having length but not width into data defining two-dimensional representations having length and width, comprising:
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means for generating definitions of pairs of lines parallel to the lines defined by the input data; means for identifying points of intersection of the lines defined by said generated definitions; and means for combining the identified points of intersection with the generated definitions to establish the end points of said pairs of lines comprising the two-dimensional representations. - View Dependent Claims (7)
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8. In apparatus for displaying drawings which consist of intersecting line segment representations, means for converting input data defining one-dimensional line segment representations having length but no width into data defining two-dimensional representations having length and width, comprising:
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means for accessing a first table containing said input data; means for creating a second table of definitions of two-dimensional line segment representations associated with the one-dimensional line segment representations defined in said first table; means for deriving, from said first table, a list of all one-dimensional line segment representations that meet at a chosen point; means for ordering the lines in said drived list in a predetermined manner; means for calculating points of intersection of representations defined in said second table that are associated with line segment representations in said derived list; and means for placing said points of intersection into said second table as part of said definitions of two-dimensional line segment representations. - View Dependent Claims (9, 10)
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Specification