protected void preCache(List<Position> grid, Position centerPosition)
throws InterruptedException {
// Pre-cache the tiles that will be needed for the intersection calculations.
double n = 0;
final long start = System.currentTimeMillis();
for (Position gridPos : grid) // for each grid point.
{
final double progress = 100 * (n++ / grid.size());
terrain.cacheIntersectingTiles(centerPosition, gridPos);
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
progressBar.setValue((int) progress);
progressBar.setString(null);
}
});
}
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
progressBar.setValue(100);
}
});
long end = System.currentTimeMillis();
System.out.printf(
"Pre-caching time %d milliseconds, cache usage %f, tiles %d\n",
end - start, terrain.getCacheUsage(), terrain.getNumCacheEntries());
}
protected void computeAndShowIntersections(final Position curPos) {
this.previousCurrentPosition = curPos;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
setCursor(WaitCursor);
}
});
// Dispatch the calculation threads in a separate thread to avoid locking up the user
// interface.
this.calculationDispatchThread =
new Thread(
new Runnable() {
public void run() {
try {
performIntersectionTests(curPos);
} catch (InterruptedException e) {
System.out.println("Operation was interrupted");
}
}
});
this.calculationDispatchThread.start();
}
protected void performIntersectionTests(final Position curPos) throws InterruptedException {
// Clear the results lists when the user selects a new location.
this.firstIntersectionPositions.clear();
this.sightLines.clear();
// Raise the selected location and the grid points a little above ground just to show we can.
final double height = 5; // meters
// Form the grid.
double gridRadius = GRID_RADIUS.degrees;
Sector sector =
Sector.fromDegrees(
curPos.getLatitude().degrees - gridRadius, curPos.getLatitude().degrees + gridRadius,
curPos.getLongitude().degrees - gridRadius,
curPos.getLongitude().degrees + gridRadius);
this.grid = buildGrid(sector, height, GRID_DIMENSION, GRID_DIMENSION);
this.numGridPoints = grid.size();
// Compute the position of the selected location (incorporate its height).
this.referencePosition = new Position(curPos.getLatitude(), curPos.getLongitude(), height);
this.referencePoint =
terrain.getSurfacePoint(curPos.getLatitude(), curPos.getLongitude(), height);
// // Pre-caching is unnecessary and is useful only when it occurs before the
// intersection
// // calculations. It will incur extra overhead otherwise. The normal intersection
// calculations
// // cause the same caching, making subsequent calculations on the same area
// faster.
// this.preCache(grid, this.referencePosition);
// On the EDT, show the grid.
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
progressBar.setValue(0);
progressBar.setString(null);
clearLayers();
showGrid(grid, referencePosition);
getWwd().redraw();
}
});
// Perform the intersection calculations.
this.startTime = System.currentTimeMillis();
for (Position gridPos : this.grid) // for each grid point.
{
//noinspection ConstantConditions
if (NUM_THREADS > 0) this.threadPool.execute(new Intersector(gridPos));
else performIntersection(gridPos);
}
}
/** Keeps the progress meter current. When calculations are complete, displays the results. */
protected synchronized void updateProgress() {
// Update the progress bar only once every 250 milliseconds to avoid stealing time from
// calculations.
if (this.sightLines.size() >= this.numGridPoints) endTime = System.currentTimeMillis();
else if (System.currentTimeMillis() < this.lastTime + 250) return;
this.lastTime = System.currentTimeMillis();
// On the EDT, update the progress bar and if calculations are complete, update the World
// Window.
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
int progress = (int) (100d * getSightlinesSize() / (double) numGridPoints);
progressBar.setValue(progress);
if (progress >= 100) {
setCursor(Cursor.getDefaultCursor());
progressBar.setString((endTime - startTime) + " ms");
showResults();
System.out.printf("Calculation time %d milliseconds\n", endTime - startTime);
}
}
});
}