Update map generator for federal election.

2025-03-02 23:14:50 +11:00
parent 2a0ba8eed2
commit 608ed0f92c
4 changed files with 156 additions and 3 deletions
--- a/map-generator/shptojson/shptojson.c
+++ b/map-generator/shptojson/shptojson.c
@@ -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);
+}