private void traceContour(
float[][] grid,
int[] cell,
double level,
double west,
double north,
double cellSize,
GeoSet levelGeoSet) {
GeoPath geoPath = traceContour(grid, cell, level, west, north, cellSize);
if (geoPath != null && geoPath.getPointsCount() > 1) {
levelGeoSet.add(geoPath);
}
}
private GeoPath traceContour(
float[][] grid, int[] cell, double level, double west, double north, double cellSize) {
GeoPath geoPath = null;
int[] current_cell = new int[] {cell[0], cell[1]};
double[] pt = new double[2];
pt[0] = west + cell[0] * cellSize;
pt[1] = north + cell[1] * cellSize;
int nbrPts = 0;
final int cols = grid[0].length;
final int rows = grid.length;
// first trace contour in backward direction
while (current_cell[0] >= 0
&& current_cell[0] < cols - 1
&& current_cell[1] >= 0
&& current_cell[1] < rows - 1
&& contourCell(false, grid, current_cell, level, west, north, cellSize, pt)) {
if (nbrPts > 0) {
geoPath.lineTo(pt[0], pt[1]);
} else {
geoPath = new GeoPath();
geoPath.moveTo(pt[0], pt[1]);
}
nbrPts++;
}
if (nbrPts > 1) {
geoPath.invertDirection();
}
// reset the flag for the starting cell
flags[cell[1]][cell[0]] = false;
current_cell[0] = cell[0];
current_cell[1] = cell[1];
// then trace contour in forward direction
while (current_cell[0] >= 0
&& current_cell[0] < cols - 1
&& current_cell[1] >= 0
&& current_cell[1] < rows - 1
&& contourCell(true, grid, current_cell, level, west, north, cellSize, pt)) {
if (nbrPts > 0) {
geoPath.lineTo(pt[0], pt[1]);
} else {
geoPath = new GeoPath();
geoPath.moveTo(pt[0], pt[1]);
}
nbrPts++;
}
if (geoPath != null) {
geoPath.setVectorSymbol(this.vectorSymbol);
}
return geoPath;
}