Hi,
These methods are not implemented in Java standard API.
I give you the line intersection routine :
public static Point2D lineIntersection(Line2D line1, Line2D line2)
{
Point2D cp = null;
double a1,b1,c1,a2,b2,c2,denom;
a1 = line1.getY2()-line1.getY1();
b1 = line1.getX1()-line1.getX2();
c1 = line1.getX2()*line1.getY1()-line1.getX1()*line1.getY2();
// a1x + b1y + c1 = 0 line1 eq
a2 = line2.getY2()-line2.getY1();
b2 = line2.getX1()-line2.getX2();
c2 = line2.getX2()*line2.getY1()-line2.getX1()*line2.getY2();
// a2x + b2y + c2 = 0 line2 eq
denom = a1*b2 - a2*b1;
if(denom != 0)
cp = new Point2D.Double((b1*c2 - b2*c1)/denom,(a2*c1 -
a1*c2)/denom);
else
{
// lines are parallel
}
return cp;
}
You should read the state of the art books on Computational Geomatry to
find this kind of algorithms.
Jérôme Thièvre
[EMAIL PROTECTED] a écrit :
Hi all,
It seems that the intersct() of Line2D will only return a boolean value. I'm
looking for some sample code to calculate the intersection of a line and a
polygon (or 2 lines) and return the point. In addition, I need to calculate the
area of a regular polygon. I guess the the source files of Line2D.intersect()
and Graphics2D.fill() will help a lot. I'll look into those files later in the
afternoon. But I hope I can get some suggestions from you. Thank you in advance.
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