/**
* look through the list of coordinate, and see if any are contained within the currently visible
* area
*/
private boolean isVisible(
final LatLonPoint tl, final LatLonPoint br, final CoordFloatString coords) {
boolean res = false;
final MWC.GenericData.WorldLocation _tl =
new MWC.GenericData.WorldLocation(tl.getLatitude(), tl.getLongitude(), 0);
final MWC.GenericData.WorldLocation _br =
new MWC.GenericData.WorldLocation(br.getLatitude(), br.getLongitude(), 0);
final MWC.GenericData.WorldArea area = new MWC.GenericData.WorldArea(_tl, _br);
area.normalise();
for (int i = 0; i < coords.maxIndex(); i++) {
final float x = coords.getXasFloat(i);
final float y = coords.getYasFloat(i);
_workingLocation.setLat(y);
_workingLocation.setLong(x);
if (area.contains(_workingLocation)) {
res = true;
continue;
}
}
return res;
}
private boolean overlaps(
final LatLonPoint tl, final LatLonPoint br, final CoordFloatString coords) {
boolean res = false;
float maxLat = 0, minLat = 0, maxLong = 0, minLong = 0;
boolean first = true;
// create our area of interest
_workingArea.getTopLeft().setLat(tl.getLatitude());
_workingArea.getTopLeft().setLong(tl.getLongitude());
_workingArea.getBottomRight().setLat(br.getLatitude());
_workingArea.getBottomRight().setLong(br.getLongitude());
// build up the area of the coords
final int len = Math.abs(coords.maxIndex());
for (int i = 0; i < len; i++) {
// retrieve the x and y values
final float x = coords.getXasFloat(i);
final float y = coords.getYasFloat(i);
// initialise our values if this is the first pass
if (first) {
first = false;
maxLat = minLat = y;
maxLong = minLong = x;
} else {
// else update our extreme values
minLat = Math.min(minLat, y);
maxLat = Math.max(maxLat, y);
minLong = Math.min(minLong, x);
maxLong = Math.max(maxLong, x);
}
}
// put our limits into the area of this line
_otherWorkingArea.getTopLeft().setLat(maxLat);
_otherWorkingArea.getTopLeft().setLong(minLong);
_otherWorkingArea.getBottomRight().setLat(minLat);
_otherWorkingArea.getBottomRight().setLong(maxLong);
// so, we've now got our two areas, see if they overlap
res = _workingArea.overlaps(_otherWorkingArea);
// well done!
return res;
}
