| 摘要 |
A graphic module wherein, given a curve P(x,y)=P(x(t), y(t)) between two points P0(x,y)=P0(x(t0), y(t0)) and P1(x,y)=P1(x(t1), y(t1)), in the screen coordinates, a calculating circuit computes a curve mid-point Phalf(x,y)=Phalf(x(thalf), y(thalf)), where thalf=((t0+t1)/2 on the curve, computes a segment mid-point PM(x,y)=(P0(x,y)+P1(x,y))/2 on segment P0P1, computes a distance function d between the curve mid-point and the segment mid-point, and, given two thresholds THR0 and THR1, with THR0<=THR1, if d<THR0, it generates line segment PoP1, and if THR0<=d<THR1, it generates two line segments P0Phalf and PhalfP1, and if d>=THR1, it repeats the previous steps for the curve portions from P0 to Phalf and from Phalf to P1.
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