## Google Maps JavaScript API v3: how to get the center lat & lon of a polygon

How to get the center lat & lon of a polygon? We can do it just by calling polygon.getBounds().getCenter() Note: in Google Maps JavaScript API…

## PHP: How to check if a Polygon is self-intersect?

How to check if a Polygon is self-intersect? Example 1: Result: bool(false) Example 2: Result: bool(true)

## PHP: How to determine the center of a Polygon

How to determine the center of a Polygon. Read first: PHP: How to calculate signed area of a Polygon Method 1: Result: array(2) { =>…

## PHP: How to check if polygon is concave or convex?

How to check if polygon is concave or convex? Note: It is assumed that the polygon is simple (does not intersect itself or have holes)…

## PHP: How to check if the vertices of polygon are in clockwise or counter-clockwise order?

How to check if the vertices of polygon are in clockwise or counter-clockwise order? There are many of method to check this. We offer some…

## PHP: How to calculate signed area of a Polygon

Calculating the signed area for an polygon can be found when you know the coordinates of the vertices. We offer 3 methods below: Method 1:…

## Google Maps JavaScript API v3: method Polygon.getBounds

In Google Maps JavaScript API v2, Polygon had a getBounds() method, but that doesn’t exist for v3 Polygon. Here’s the solution: Here, we present a…

## Google Maps JavaScript API v3: method Polyline.getBounds

In Google Maps JavaScript API v2, Polyline had a getBounds() method, but that doesn’t exist for v3 Polyline. I wrote some methods below: Method 1:…

## PHP: detect Point in Polygon

PHP function to detect Point in Polygon: Test for convex polygon: Result: IN OUT Test for concave polygon: Result: OUT IN OUT Note: we only…

## PHP: Calculate Distance Between Two Coordinates

This routine calculates the distance between two points (given the latitude/longitude of those points). It is being used to calculate the distance between two locations:…