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Map display method

  • US 20100182342A1
  • Filed: 11/13/2009
  • Published: 07/22/2010
  • Est. Priority Date: 01/20/2009
  • Status: Active Grant
First Claim
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1. Map display method allowing the display of a portion of a map to be enlarged, without hiding another portion of this map, comprising:

  • displaying a first portion to be enlarged by applying respective enlargement ratios greater than 100%, with a 100% ratio corresponding to the initial display, to at least some elements of that portion,displaying a first peripheral portion located on the periphery of the first portion to be enlarged,applying, at least to some elements of that peripheral portion, respective enlargement ratios with values lower than 100% and such that the combination of the display surface of the peripheral portion and the display surface of the portion to be enlarged occupies, in the new image of the map, a surface equal to that of the combination of the display surface of the portion to be enlarged and the display surface of the peripheral portion in the original image of the map;

    choosing the minimum value of the enlargement ratio to be applied to the elements of the peripheral zone so as to leave the essential details of the map visible;

    then determining all of the values of the enlargement ratio to be applied respectively to the elements of the peripheral portion, in such a way that these values are at least equal to the minimum value chosen in this way;

    and determining all of the values of the enlargement ratio, to be applied respectively to the elements of the portion to be enlarged, such that the combination of the display surface of the peripheral portion and the display surface of the portion to be enlarged occupies in the new image a surface equal to that of the combination of the display surface of the portion to be enlarged and the display surface of the peripheral portion in the original image of the map;

    detecting an event which appears in said first peripheral portion, and then;

    defining a second portion to be enlarged, centered on the position (BS2) of this event,defining a second peripheral zone associated with this second portion to be enlarged,displaying the second portion to be enlarged by applying respective enlargement ratios greater than 100% to at least some elements of that portion, so as to make the event more legible,and displaying the second peripheral portion by applying respective enlargement ratios lower than 100% to at least some elements of that portion, determining the enlargement ratios to be applied respectively to the elements which make up the combination of the surfaces displaying the first and the second peripheral portion, through stages involving;

    selecting the minimum value of the enlargement ratio to be applied to the elements of the combination of the surfaces displaying the first and the second peripheral portion;

    then determining all of the values of the enlargement ratio to be applied respectively to the elements of the combination of the surfaces displaying the first and second peripheral portion, in such a way that these values are at least equal to the minimum value chosen in this way;

    and determining all the values of the enlargement ratio to be applied respectively to the elements of the first and the second portion to be enlarged, in such a way that the combination of the surfaces displaying the first and the second peripheral portion, of the surface displaying the first portion to be enlarged, and of the surface displaying the second portion to be enlarged, occupies in the new image a surface equal to that of the combination of the first portion to be enlarged, the second portion to be enlarged (SPA5), the first peripheral portion and the second peripheral portion, in the original image of the map.

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