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/*
* Copyright 2018, 2020-2021 Uber Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Example program that compacts a set of indexes, and then uncompacts
* to the original set.
*/
#include <assert.h>
#include <h3/h3api.h>
#include <inttypes.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
H3Index input[] = {
// All with the same parent index
0x8a2a1072b587fffL, 0x8a2a1072b5b7fffL, 0x8a2a1072b597fffL,
0x8a2a1072b59ffffL, 0x8a2a1072b58ffffL, 0x8a2a1072b5affffL,
0x8a2a1072b5a7fffL,
// These don't have the same parent index as above.
0x8a2a1070c96ffffL, 0x8a2a1072b4b7fffL, 0x8a2a1072b4a7fffL};
int inputSize = sizeof(input) / sizeof(H3Index);
printf("Starting with %d indexes.\n", inputSize);
H3Index *compacted = calloc(inputSize, sizeof(H3Index));
H3Error err = compactCells(input, compacted, inputSize);
// An error case can occur on e.g. duplicate input.
assert(err == E_SUCCESS);
int compactedCount = 0;
printf("Compacted:\n");
for (int i = 0; i < inputSize; i++) {
if (compacted[i] != 0) {
printf("%" PRIx64 "\n", compacted[i]);
compactedCount++;
}
}
printf("Compacted to %d indexes.\n", compactedCount);
int uncompactRes = 10;
int64_t uncompactedSize;
H3Error err2 = uncompactCellsSize(compacted, inputSize, uncompactRes,
&uncompactedSize);
assert(err2 == E_SUCCESS);
H3Index *uncompacted = calloc(uncompactedSize, sizeof(H3Index));
int err3 = uncompactCells(compacted, compactedCount, uncompacted,
uncompactedSize, uncompactRes);
// An error case could happen if the output array is too small, or indexes
// have a higher resolution than uncompactRes.
assert(err3 == E_SUCCESS);
int uncompactedCount = 0;
printf("Uncompacted:\n");
for (int i = 0; i < uncompactedSize; i++) {
if (uncompacted[i] != 0) {
printf("%" PRIx64 "\n", uncompacted[i]);
uncompactedCount++;
}
}
printf("Uncompacted to %d indexes.\n", uncompactedCount);
free(compacted);
free(uncompacted);
}
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