GEOintersectStraightStraight

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Cut of two straight lines.

Delivers the intersection, if necessary the factors of (P2-P1) and (P4-P3) to reach of the intersection. All back values which are not needed may receive zero pointer.

Parametre

g1x1 (stands in) [IN]

Co-ordinate on the x axis of the first point first Just.

g1y1 (stands in) [IN]

Co-ordinate on the Y axis of the first point first Just.

g1x2 (stands in) [IN]

Co-ordinate on the x axis of the second point first Just.

g1y2 (stands in) [IN]

Co-ordinate on the Y axis of the second point first Just.

g2x1 (stands in) [IN]

Co-ordinate on the x axis of the first point second Just.

g2y1 (stands in) [IN]

Co-ordinate on the Y axis of the first point second Just.

g2x2 (stands in) [IN]

Co-ordinate on the x axis of the second point second Just.

g2y2 (stands in) [IN]

Co-ordinate on the Y axis of the second point second Just.

xs (stands in *) [IN / OUT]

Co-ordinate on the x axis of the intersection.

ys (stands in *) [IN / OUT]

Co-ordinate on the Y axis of the intersection.

s1 (stands in *) [IN / OUT]

s1 is the factor with which is determined whether the intersection still lies on the first straight lines. Is valid 0≤s1≤1, so the intersection is still on the first straight lines.

s2 (stands in *) [IN / OUT]

s2 is the factor with which is determined whether the intersection still lies on the second straight lines. Is valid 0≤s2≤1, so the intersection is still on the second straight lines.

Result

(int) [OUT]

As a return value it is delivered:

0 no intersection,

1 intersection available.

Declaration

#include "basic.h"

int DLLENTRY GEOintersectStraightStraight (

stand in g1x1,

stand in g1y1,

stand in g1x2,

stand in g1y2,