Checking if GEOSGeometry is Empty in C Using GEOS Library

In C, check weather GEOSGeometry is empty

To check whether a GEOSGeometry object is empty in C, you can use the GEOS library, which is a C++ port of the Java Topology Suite (JTS). The GEOS library provides a function called GEOSisEmpty to determine if a geometry is empty.

Here's a basic example of how you can use this function:

1. First, ensure you have included the necessary headers and linked against the GEOS library.
2. Use the GEOSisEmpty function to check if the geometry is empty.

Here is a simple example:

#include <stdio.h>
#include <geos_c.h>

int main() {
    // Initialize the GEOS library
    initGEOS(NULL, NULL);

    // Create a GEOSGeometry object (for example, an empty point)
    GEOSGeometry* geom = GEOSGeom_createEmptyPoint();

    // Check if the geometry is empty
    if (GEOSisEmpty(geom)) {
        printf("The geometry is empty.\n");
    } else {
        printf("The geometry is not empty.\n");
    }

    // Clean up and free the geometry
    GEOSGeom_destroy(geom);

    // Finish the GEOS library
    finishGEOS();

    return 0;
}

In this example:

• initGEOS initializes the GEOS library.
• GEOSGeom_createEmptyPoint creates an empty point geometry.
• GEOSisEmpty checks if the geometry is empty.
• GEOSGeom_destroy frees the memory allocated for the geometry.
• finishGEOS cleans up the GEOS library.

Make sure you have the GEOS library installed and properly linked when compiling your program. You can typically install GEOS using your package manager (e.g., sudo apt-get install libgeos-dev on Debian-based systems) and compile your program with -lgeos_c to link against the GEOS C API.