Appeal 2007-0563
Application 10/001,940
1 p. 218. This article discloses the general concept of item
2 buffers, but provides no detail on how to implement an item
3 buffer. (Montgomery, col. 2, ll. 6-11).
4
5 21. Montgomery explains the desire to improve performance in the
6 method of picking a graphics object.
7 22. Montgomery describes a method for a system that uses a buffer to
8 determine which graphic object has been selected by a user (Abstract).
9 23. For each pixel location in each of the graphic objects, a unique
10 identifier is stored at a corresponding location in the buffer (Id.).
11 24. A graphics object is selected using a pointer device, and the
12 pointer device location is used to access the item buffer and retrieve the item
13 identifier that defines the graphic object picked (Id.).
14 25. Montgomery explains in more detail its system as follows:
15 FIG. 2 shows an illustration of graphic objects displayed within
16 a buffer. Referring now to FIG. 2, a computer graphics display
17 list 202 contains two graphics objects 204 and 206. Graphics
18 object 204 has been assigned an item identifier, which is a
19 number 1, the Graphics Object has a rectangle shape, and it will
20 be displayed using color number 5. Graphics object 206 has
21 been assigned item number 2, the Object has a triangle shape,
22 and it will be displayed using color number 9. Alternatively,
23 the relative number of the graphics object, from the beginning
24 of the list, could be used as the item number, thus avoiding
25 storing the item number in the list.
26
27 Frame buffer 210 shows how these two graphic images would
28 be rendered onto a display device, such as the graphics display
29 108 (FIG. 1). Since the triangle graphics object 206 is second
30 in the list, it was rendered after the rectangle graphics object,
8
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Last modified: September 9, 2013