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double a = (y2-y1)/(x2-x1);
double b=-a*x2+y2;
double x=y/a-b/a;
counts intersection point of line and rectangle....
what if x2==x1?
double a = (y2-y1)/(x2-x1);
double b=-a*x2+y2;
double x=y/a-b/a;
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