@Override
public MC_TYPE at(int x, int y, Aggregates<? extends Boolean> aggregates) {
int code = 0;
if (aggregates.get(x - 1, y - 1)) {
code = code | DOWN_INDEX_LEFT;
}
if (aggregates.get(x, y - 1)) {
code = code | DOWN_INDEX_RIGHT;
}
if (aggregates.get(x - 1, y)) {
code = code | UP_INDEX_LEFT;
}
if (aggregates.get(x, y)) {
code = code | UP_INDEX_RIGHT;
}
return MC_TYPE.get(code);
}
@Override
public Boolean at(int x, int y, Aggregates<? extends N> aggregates) {
Number v = aggregates.get(x, y);
if (v == null) {
return false;
}
double delta = threshold.doubleValue() - v.doubleValue();
return delta < 0;
}
@Override
public A get(int x, int y) {
if ((x >= base.lowX() && x < base.highX()) && (y >= base.lowY() && y < base.highY())) {
return base.get(x, y); // Its inside
} else if ((x == base.lowX() - 1 || x == base.highX() + 1)
&& (y >= base.lowY() - 1 && y < base.highY() + 1)) {
return pad; // Its immediate above or below
} else if ((y == base.lowY() - 1 || y == base.highY() + 1)
&& (x >= base.lowX() - 1 && x < base.highX() + 1)) {
return pad; // Its immediately left or right
} else {
return base.defaultValue();
}
}
/**
* An iso level can be made of multiple regions with holes in them. This builds one path (into
* the passed GeneralPath) that represents one connected contour.
*
* @param isoData Marching-cubes classification at each cell
* @param isoDivided The boolean above/below classification for each cell (to disambiguate
* saddles)
* @param iso The path to build into
*/
public static void stichContour(
Aggregates<MC_TYPE> isoData,
Aggregates<Boolean> isoDivided,
GeneralPath iso,
int startX,
int startY) {
int x = startX, y = startY;
SIDE prevSide = SIDE.NONE;
// Found an unambiguous iso line at [r][c], so start there.
MC_TYPE startCell = isoData.get(x, y);
Point2D nextPoint = startCell.firstSide(prevSide).nextPoint(x, y);
iso.moveTo(nextPoint.getX(), nextPoint.getY());
prevSide = isoData.get(x, y).secondSide(prevSide, isoDivided.get(x, y));
// System.out.printf("-------------------\n);
do {
// Process current cell
MC_TYPE curCell = isoData.get(x, y);
nextPoint = curCell.secondSide(prevSide, isoDivided.get(x, y)).nextPoint(x, y);
// System.out.printf("%d,%d: %s\n",x,y,curCell.secondSide(prevSide, isoDivided.get(x,y)));
iso.lineTo(nextPoint.getX(), nextPoint.getY());
SIDE nextSide = curCell.secondSide(prevSide, isoDivided.get(x, y));
isoData.set(x, y, curCell.clearWith()); // Erase this marching cube line entry
// Advance for next cell
prevSide = nextSide;
switch (nextSide) {
case LEFT:
x -= 1;
break;
case RIGHT:
x += 1;
break;
case BOTTOM:
y += 1;
break;
case TOP:
y -= 1;
break;
case NONE:
throw new IllegalArgumentException(
"Encountered side NONE after starting contour line.");
}
} while (x != startX || y != startY);
iso.closePath();
}
/**
* Build a single path from all of the contour parts.
*
* <p>May be disjoint and have holes (thus GeneralPath).
*
* @param classified The line-segment classifiers
* @param isoDivided Original classification, used to disambiguate saddle conditions
* @return Resulting contour
*/
public static final GeneralPath assembleContours(
Aggregates<MC_TYPE> classified, Aggregates<Boolean> isoDivided) {
GeneralPath isoPath = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
// Find an unambiguous case of an actual line, follow it around and build the line.
// Stitching sets the line segments that have been "consumed" to MC_TYPE.empty, so segments
// are only processed once.
for (int x = classified.lowX(); x < classified.highX(); x++) {
for (int y = classified.lowY(); y < classified.highY(); y++) {
MC_TYPE type = classified.get(x, y);
if (type != MC_TYPE.empty
&& type != MC_TYPE.surround
&& type != MC_TYPE.diag_one
&& type != MC_TYPE.diag_two) {
stichContour(classified, isoDivided, isoPath, x, y);
}
}
}
return isoPath;
}
@Override
public A get(int x, int y) {
return base.get(x, y);
}