http://armand.eu/blog/a-simple-spatial-hashing-hashgrid-for-processing-2

Hashgrid_00.pde

public class HashGrid {
float bucketSize;
int gridWidth, gridHeight, bucketLength, numberOfRows, numberOfCols;
 
HashGrid(float bucketSize_, int gridWidth_, int gridHeight_, int bucketLength_) {
}
void set(Points point_) { //TODO: it is better probably to use an interface instead of hardcoding it but for now! ...
}
Points[] get(PVector location_) {
Points[] answer = new Points[answerLength];
return answer;
}
void drawGrid() {
}
public class Buckets {
Points [] bucket = new Points[bucketLength];//TODO: use an interface instead!
int arrayPointer;
}
}