Drawing OMPoly with markings

I am trying to draw a regular OMPoly with markings evenly spaced on the
Polygon
(like a railroad line).

First I tried just drawing the OMPoly and then (using xpoints and
ypoints from the OMPoly),
I would evenly divide the poly in segments and then draw a slash at each
point.

This worked fine except when I would draw a very large OMPoly and then
zoom in very close.
I would be drawing stuff offscreen and it would take too long for it all
to render.

I then tried to only draw my slashes on the visible portion of the
OMPoly. Here is where my
problems arose. I am having difficulty determining which parts of the
OMPoly are visible on the screen.
When I zoom in tight on the OMPoly (scale < 10000), my code says that no
portion of the OMPoly
is on the screen, even though I can see it! Has anyone tried something
like this? Here's a snippet of my
code to find the visible segments...

*****************************
Rectangle rect = new Rectangle(new Point(0, 0), mapBean.getSize());

for(i = 0; i < xpoints.length; i++) {
   int length2 = xpoints[i].length;

   for(j = 0; j < length2 - 1; j++) {

     //Get a line segment of the total poly.
     int x1 = xpoints[i][j];
     int y1 = ypoints[i][j];
     int x2 = xpoints[i][j+1];
     int y2 = ypoints[i][j+1];

     //test the retangle, 'rect' is visible area

     if(rect.contains(x1, y1) ||
        rect.contains(x2, y2) ||
        rect.intersectsLine(x1, y1, x2, y1)) {
          System.out.println(rect + " intersects " + x1 + " " + y1 + " "
+ x2 + " " + y2);
     } else {
          System.out.println(rect + " does not intersect " + x1 + " " +
y1 + " " + x2 + " " + y2);
     }
  }
}

*****************************

--
Jeremy "Slacker" Zacker  -  "BLAH!"
MCS Blk IV
(732) 450-7066
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