Method and apparatus for selection and manipulation of an overlapping graphical element on a display

• US 6,018,333 A
• Filed: 12/21/1994
• Issued: 01/25/2000
• Est. Priority Date: 12/21/1994
• Status: Expired due to Term

• Current Assignee: NCR Corporation, Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Denber, Michel J.
• Primary Examiner(s): NGUYEN, CHANH DUY
• Application Number:
  US08/360,478
• Time in Patent Office: 1,861 Days
• Field of Search: 345/112, 345/119, 345/120, 345/113, 345/118, 345/145, 345/340, 345/343, 345/344, 345/345, 395/155, 395/157, 395/159, 395/156, 395/119, 395/118
• US Class Current: 715/790
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence

Abstract

The present invention is a method and apparatus for simplifying the selection and manipulation of one or more graphical elements which overlap at at least one common point or region on a display, displaying the graphical elements in a separated manner while showing the relationship between such elements, and improving the ability to select one of a plurality of overlapping elements depicted on the display of a data processing system. The present invention finds particular use with well-known drawing and illustration software suitable for use on data processing systems.

Claims

1. A method of operating a data processing system to select an element, using a pointing device, from among a plurality of overlapping elements displayed in an image display plane of the data processing system, wherein the image display plane includes a first window in which the plurality of overlapping elements are displayed and where the pointing device establishes a selection point in the image display plane and provides location information for the selection point, including the steps of:

determining coordinates of the selection point;

identifying, based upon the coordinates, all elements having at least one point in common with the selection point;

automatically recognizing when plural elements have a point in common with the selection point;

upon automatically recognizing plural elements in common with the selection point, opening a second window in the image display plane and displaying in a second window, at a separate location of the image display plane, representations of the identified plural elements recognized, in a spaced-apart fashion suitable for the selection of one of the representations; and

selecting one of the representations of the plural elements displayed at the separate location, wherein the selection of the representation also selects the associated one of the plural elements.

2. The method of claim 1 further comprising the step of automatically closing the second window upon the selection of at least one of the representations of the plural elements.

3. The method of claim 1 wherein the step of displaying representations of the identified plural elements in a spaced apart fashion comprises the steps of:

determining a relationship between the identified plural elements; and

spacing the representations of the elements within the second window in a manner indicative of the relationship.

4. The method of claim 3 wherein the relationship is indicative of a relative layer that the elements occupy in a three-dimensional image space.

5. The method of claim 4 wherein the step of spacing the representations of the elements within the second window comprises the step of showing the representations in a three-dimensional fashion within the second window, whereby the relative positioning of the representations of the elements is indicative of the relative relationships between the elements.

6. The method of claim 5 wherein the relative relationships between the elements are stored in a data structure in memory, the data structure being suitable for enabling the generation of both the two-dimensional image displayed in the first window, and the the three-dimensional image displayed in the second window.

7. The method of claim 6 further comprising the steps of:

moving the selected one of the representations of the elements displayed at the second window relative to another of the representations displayed therein so as to alter the overlapping relationship therebetween; and

updating the display of the overlapping graphical elements in both the first window and the second window so as to depict the altered overlapping relationship.

8. The method of claim 7 further comprising the step of updated the data structure at any time the representations of the plural elements displayed at the second window are moved relative to another.

9. The method of claim 1 further comprising the step of altering the magnification of the second window so as to change the size of the representations displayed therein.

10. The method of claim 1 further comprising the steps of:

moving the selected one of the representations of the plural elements displayed at the separate location relative to another of the representations so as to alter the overlapping relationship therebetween; and

updating the display of the overlapping graphical elements in the image display plane so as to depict the altered overlapping relationship.

11. The method of claim 1, wherein the point in common with the selection point is a control point for the plural elements.

12. An apparatus for selecting a graphical element, using a pointing device, from among a plurality of overlapping graphical elements displayed on an image display in a data processing system, wherein the pointing device establishes a selection point in the image display plane and provides location information for the selection point, including:

a pointer interface for generating a pair of coordinates for the selection point;

element identifying means, responsive to said pointer interface, for receiving the coordinate pair and, based upon the coordinates, identifying all graphical elements having at least one point in common with the selection point;

control circuitry for automatically determining when a plurality of identified graphical elements have a point in common with the selection point;

a display window, for displaying at a separate location on the image display, representations of the identified plural graphical elements in a spaced-apart fashion for selection thereof; and

selection means, responsive to said coordinate determining means, for recognizing the selection of one of the representations of the plural graphical elements displayed at the separate location, wherein the selection of the representation also selects the associated one of the plural graphical elements.

13. The apparatus of claim 12 wherein said display window for displaying representations of the identified plural graphical elements comprises a two-dimensional window containing a three-dimensional representation of the graphical elements therein.

14. The apparatus of claim 13 wherein the relative positions of the graphical elements in the three-dimensional representation is indicative of the relative relationships between the overlapping graphical elements.

15. The apparatus of claim 12, further including:

means, responsive to the coordinates generated by the pointer interface in response to movement of the pointing device, for moving a selected one of the representations of the plural graphical elements relative to another of the graphical element representations so as to alter the overlapping relationship therebetween; and

a video driver for refreshing the display of the overlapping graphical elements in the image display plane so as to depict the altered overlapping relationship.

16. The apparatus of claim 12, wherein the point in common with the selection point is a control point for the plurality of graphical elements.