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Added [g]closest(x,y,z,index,count,stride) to the expression parser.

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This function reads <count> x/y/z triplets from [g]megabuf, starting at <index> and advancing <stride> elements each time.
It then finds the element closest to the given coordinates.
This commit is contained in:
TomyLobo 2012-07-13 17:29:21 +02:00
parent 613f3884d4
commit 6c413289be
1 changed files with 48 additions and 0 deletions
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48
src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java
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@ -309,6 +309,54 @@ public final class Functions {
return setBufferItem(Expression.getInstance().getMegabuf(), (int) index.getValue(), value);
}
@Dynamic
public static final double closest(RValue x, RValue y, RValue z, RValue index, RValue count, RValue stride) throws EvaluationException {
return findClosest(
Expression.getInstance().getMegabuf(),
x.getValue(),
y.getValue(),
z.getValue(),
(int) index.getValue(),
(int) count.getValue(),
(int) stride.getValue()
);
}
@Dynamic
public static final double gclosest(RValue x, RValue y, RValue z, RValue index, RValue count, RValue stride) throws EvaluationException {
return findClosest(
gmegabuf,
x.getValue(),
y.getValue(),
z.getValue(),
(int) index.getValue(),
(int) count.getValue(),
(int) stride.getValue()
);
}
private static double findClosest(Map<Integer, double[]> megabuf, double x, double y, double z, int index, int count, int stride) {
int closestIndex = -1;
double minDistanceSquared = Double.MAX_VALUE;
for (int i = 0; i < count; ++i) {
double currentX = getBufferItem(megabuf, index+0) - x;
double currentY = getBufferItem(megabuf, index+1) - y;
double currentZ = getBufferItem(megabuf, index+2) - z;
double currentDistanceSquared = currentX*currentX + currentY*currentY + currentZ*currentZ;
if (currentDistanceSquared < minDistanceSquared) {
minDistanceSquared = currentDistanceSquared;
closestIndex = index;
}
index += stride;
}
return closestIndex;
}
private static final Random random = new Random();