| 摘要 |
In one embodiment, selecting auxiliary screen regions to activate in rendering a straight line segment on a screen of a computer monitor, wherein the straight line segment comprises points defined by an algebraic expression equal to zero, wherein the expression is expressed as a first constant multiplied by a x-axis value plus a second constant multiplied by a y-axis value plus a third constant, wherein the straight line segment has a width. Disclosed are steps of overlaying a rectangular grid to associated screen region boundaries, wherein the screen comprises a screen space divided into multiple screen regions, shifting the rectangular grid in a preselected direction parallel to a preselected axis by a fraction of the width of the straight line segment, and for each corner point of the shifted rectangular grid, computing the expression, obtaining an algebraic sign of the result of computing the expression, and when the algebraic sign just obtained differs from that obtained for the expression for any other shifted rectangular grid corner point, marking the associated screen region as selected.
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