Abstract: In image processing adapted to a display apparatus using a plurality of line buffers for storing data regarding dots aligned on scanning lines on the screen, when a line having a prescribed width and a prescribed length is drawn on the screen, a line drawing range is calculated with reference to start-point coordinates and end-point coordinates as well as the width of line, thus selecting dots on the screen with reference to coordinates of intersections between the scanning lines and the boundaries of the line drawing range, wherein data regarding the selected dots are written into at least one of the line buffers. In line terminating processing, a virtual circle whose diameter matches the width of the line is imaginarily drawn at one end of the line, so that data regarding dots belonging to the virtual circle are written into at least one of the line buffers.

Abstract: A display-object manager that manages a display of object identifiers on a display screen. The object identifiers are organized in a tree structure, and represent objects. The display-object manager displays the object identifiers and then selects a subset of the object identifiers to compress. All members of the subset are siblings in the tree structure, and their parent has additional children that are not in the subset. The display-object manager replaces the display of the subset with a new identifier that represents the subset.