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Update map generator for federal election.

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This commit is contained in:
Kim Taylor
2025-03-02 23:14:50 +11:00
parent 2a0ba8eed2
commit 608ed0f92c
4 changed files with 156 additions and 3 deletions
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2
map-generator/dist/main.js vendored
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File diff suppressed because one or more lines are too long

11
map-generator/shptojson/Makefile Normal file
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@@ -0,0 +1,11 @@
SHPFILE := ../../../spl-data/federal_2025/aec_data/E_VIC24_region.shp
SHAPELIB := ../../../lib/shapelib-1.6.0
../federal_2025_boundaries.json: $(SHPFILE) shptojson
LD_LIBRARY_PATH=$(SHAPELIB)/.libs ./shptojson $(SHPFILE) > $@
CFLAGS := -I $(SHAPELIB)
LDFLAGS := -L $(SHAPELIB)/.libs
shptojson: shptojson.c
gcc -Wall $(CFLAGS) $(LDFLAGS) -lshp $< -o $@

142
map-generator/shptojson/shptojson.c Normal file
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@@ -0,0 +1,142 @@
/******************************************************************************
*
* Project: Shapelib
* Purpose: Sample application for dumping contents of a shapefile to
* the terminal in human readable form.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************
*
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "shapefil.h"
int main(int argc, char **argv)
{
int nPrecision = 15;
int first;
const char *divison_name;
/* -------------------------------------------------------------------- */
/* Display a usage message. */
/* -------------------------------------------------------------------- */
if (argc != 2)
{
printf("Usage: shptojson shp_file\n");
exit(1);
}
/* -------------------------------------------------------------------- */
/* Open the passed shapefile. */
/* -------------------------------------------------------------------- */
SHPHandle hSHP = SHPOpen(argv[1], "rb");
DBFHandle hDBF = DBFOpen(argv[1], "rb");
if (hSHP == NULL || hDBF == NULL)
{
printf("Unable to open:%s\n", argv[1]);
exit(1);
}
/* -------------------------------------------------------------------- */
/* Print out the file bounds. */
/* -------------------------------------------------------------------- */
int nEntities;
int nShapeType;
double adfMinBound[4];
double adfMaxBound[4];
SHPGetInfo(hSHP, &nEntities, &nShapeType, adfMinBound, adfMaxBound);
fprintf(stderr, "Shapefile Type: %s # of Shapes: %d\n\n",
SHPTypeName(nShapeType), nEntities);
/* -------------------------------------------------------------------- */
/* Skim over the list of shapes, printing all the vertices. */
/* -------------------------------------------------------------------- */
printf("[\n");
for (int i = 0; i < nEntities; i++)
{
SHPObject *psShape = SHPReadObject(hSHP, i);
if (psShape == NULL)
{
fprintf(stderr,
"Unable to read shape %d, terminating object reading.\n",
i);
break;
}
divison_name = DBFReadStringAttribute(hDBF, i, 1);
fprintf(stderr, "shape %s has %i parts\n", divison_name, psShape->nParts);
printf(" {\n");
printf(" \"electorateId\": \"%08i\",\n", i);
printf(" \"electorateName\": \"%s\",\n", divison_name);
printf(" \"electorateType\": \"Division\",\n");
printf(" \"parentElectorateName\": \"%s\",\n", divison_name);
printf(" \"boundaryJson\": \"{\\\"type\\\": ");
if (psShape->nParts != 1)
{
printf("\\\"MultiPolygon\\\",\\\"coordinates\\\":[[[");
}
else
{
printf("\\\"Polygon\\\",\\\"coordinates\\\":[[");
}
first = 1;
for (int j = 0, iPart = 1; j < psShape->nVertices; j++)
{
if (iPart < psShape->nParts && psShape->panPartStart[iPart] == j)
{
iPart++;
printf("]],[[");
}
else if (!first)
{
printf(",");
}
first = 0;
printf("[%.*g,%.*g]", nPrecision, psShape->padfX[j],
nPrecision, psShape->padfY[j]);
}
if (i == (nEntities-1))
{
if (psShape->nParts != 1)
{
printf("]]]}\"\n }\n");
}
else
{
printf("]]}\"\n }\n");
}
}
else
{
if (psShape->nParts != 1)
{
printf("]]]}\"\n },\n");
}
else
{
printf("]]}\"\n },\n");
}
}
SHPDestroyObject(psShape);
}
printf("]\n");
SHPClose(hSHP);
DBFClose(hDBF);
exit(0);
}

4
map-generator/src.js
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@@ -32,7 +32,7 @@ map.on('load', () => {
map.addImage('blue-circle', image);
fetch("wards_withboundaries.json")
fetch("federal_2025_boundaries.json")
.then(response => {
response.json()
.then((wardData) => {
@@ -117,7 +117,7 @@ map.on('load', () => {
//
// The 2024 set of boundaries only uses 2 MultiPolygon objects (Cathedral in Murrindindi Shire Council and Island in Bass Coast Shire Council)
// Luckily, the second polygon for both objects results in a good label placement.
centrePoint = polylabel(featureCollection.features[0].geometry.coordinates[1], 0.000001);
centrePoint = polylabel(featureCollection.features[0].geometry.coordinates[0], 0.000001);
}