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Add the formula for number of indexes per resolution #69
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Copyright 2018 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. | ||
| */ | ||
| /** @file generateNumHexagons.c | ||
| * @brief Generates the tables for numHexagons. | ||
| * | ||
| * usage: `generateNumHexagons` | ||
| * | ||
| * This program generates the number of unique indexes (not necessarily | ||
| * hexagons) at each H3 resolution. It assumes aperture 7 and 12 pentagons | ||
| * per resolution. | ||
| */ | ||
|
|
||
| #include <inttypes.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include "constants.h" | ||
|
|
||
| #define NUM_PENTAGONS 12 | ||
|
|
||
| /** | ||
| * Generates and prints the numHexagons table. | ||
| */ | ||
| static void generate() { | ||
| printf("static const int64_t nums[] = {\n"); | ||
| int64_t count = NUM_BASE_CELLS; | ||
| for (int i = 0; i <= MAX_H3_RES; i++) { | ||
| printf(" %" PRId64 "L,\n", count); | ||
| // Each hexagon has 7 children, and each pentagon has 6 children | ||
| count = ((count - NUM_PENTAGONS) * 7) + (NUM_PENTAGONS * 6); | ||
| } | ||
| printf("};\n"); | ||
| } | ||
|
|
||
| int main(int argc, char* argv[]) { | ||
| // check command line args | ||
| if (argc > 1) { | ||
| fprintf(stderr, "usage: %s\n", argv[0]); | ||
| exit(1); | ||
| } | ||
|
|
||
| generate(); | ||
| } | ||
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Alternatively, you could change this to
int main(void)and ignore the arguments entirely.There was a problem hiding this comment.
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+1
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If we make that change, I think it should be made to all the filters. edit: by which I mean all the apps its relevant for.