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Merge "Issue #189 add some more catch blocks to contour subgridding so it works in more odd cases." into development

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Former-commit-id: cee57ad2c1 [formerly 8bb1e1675d] [formerly 625141ffb3 [formerly 6570ee57790d482a212ee65dc2ed9482ba8de8b6]]
Former-commit-id: 625141ffb3
Former-commit-id: 379b303985
This commit is contained in:
Richard Peter 2012-11-19 17:15:07 -06:00 • committed by Gerrit Code Review
commit c063e130f1
1 changed files with 45 additions and 5 deletions
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50
cave/com.raytheon.viz.core.contours/src/com/raytheon/viz/core/contours/ContourSupport.java
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@ -73,6 +73,7 @@ import com.raytheon.viz.core.contours.util.FortConBuf;
import com.raytheon.viz.core.contours.util.FortConConfig;
import com.raytheon.viz.core.interval.XFormFunctions;
import com.raytheon.viz.core.style.contour.ContourPreferences;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
@ -659,10 +660,37 @@ public class ContourSupport {
// Use referenced envelope to go from screen crs into image crs.
ReferencedEnvelope screenRefEnvelope = new ReferencedEnvelope(
screenCRSEnvelope);
screenRefEnvelope = screenRefEnvelope
.transform(
imageGridGeometry.getCoordinateReferenceSystem(),
true, 200);
try {
screenRefEnvelope = screenRefEnvelope.transform(
imageGridGeometry.getCoordinateReferenceSystem(), true,
200);
} catch (TransformException e) {
// If the corners of the screen envelope are invalid in the
// source crs then the referenced envelope fails so this is the
// backup plan. This is known to hit when displaying North Polar
// Stereographic data on a Equidistant cyclindrical projection
// that extends to the south pole.
// Start with the full image envelope
ReferencedEnvelope imageRefEnvelope = new ReferencedEnvelope(
imageGeometry2D.getEnvelope2D());
// transform to screen space.
imageRefEnvelope = imageRefEnvelope.transform(
screenRefEnvelope.getCoordinateReferenceSystem(), true,
200);
// intersect the transformed envelope with the visible portion
// of screen. Hopefully this intersection will eliminate the
// invalid points in the original screen envelope.
Envelope intersectingEnv = screenRefEnvelope
.intersection(imageRefEnvelope);
screenRefEnvelope = new ReferencedEnvelope(intersectingEnv,
screenRefEnvelope.getCoordinateReferenceSystem());
// transform the intersection back to image space, now it is
// hopefully a subgrid.
screenRefEnvelope = screenRefEnvelope.transform(
imageGridGeometry.getCoordinateReferenceSystem(), true,
200);
}
// Convert from image crs to image grid space.
GridEnvelope2D screenImageGridEnvelope = imageGeometry2D
.worldToGrid(new Envelope2D(screenRefEnvelope));
@ -744,7 +772,19 @@ public class ContourSupport {
screenImageGridEnvelope.getHigh(1));
}
} catch (Exception e) {
throw new VizException("Error transforming extent", e);
statusHandler.handle(Priority.WARN,
"Cannot compute subgrid, contouring may be slow.", e);
// Don't use a subgrid, just contour the complete image.
// This may result in doing way to much contouring which can be
// slow, but it is better than no contouring at all. It's also worth
// noting that it gets slower as you zoom in and more contours are
// generated, but as you zoom in it also becomes more likely you
// will be successful in your transformation since the smaller area
// is less likely to contain invalid points.
env.setRange(0, imageGridGeometry.getGridRange().getLow(0),
imageGridGeometry.getGridRange().getHigh(0));
env.setRange(1, imageGridGeometry.getGridRange().getLow(1),
imageGridGeometry.getGridRange().getHigh(1));
}
System.out.println("*** Subgrid: " + env);
return env;