How to implement basic geometry calculations (line intersection, polygon area) in Go?

To implement basic geometry calculations such as line intersection and polygon area in Go, you can use the package "github.com/ChristopherDavenport/geometry" which provides functions and data types for working with geometries. Here's an example code that demonstrates line intersection and polygon area calculations:

package main

import (
	"fmt"
	"github.com/ChristopherDavenport/geometry"
)

func main() {
	// Line Intersection Example
	lineA := geometry.Line{
		Start: geometry.Point{X: 0, Y: 0},
		End:   geometry.Point{X: 10, Y: 10},
	}
	lineB := geometry.Line{
		Start: geometry.Point{X: 0, Y: 10},
		End:   geometry.Point{X: 10, Y: 0},
	}
	intersection, err := geometry.LineIntersection(lineA, lineB)
	if err != nil {
		fmt.Println("Lines do not intersect")
	} else {
		fmt.Println("Lines intersect at point:", intersection)
	}

	// Polygon Area Example
	polygon := geometry.Polygon{
		Vertices: []geometry.Point{
			{X: 0, Y: 0},
			{X: 0, Y: 10},
			{X: 10, Y: 10},
			{X: 10, Y: 0},
		},
	}
	area := geometry.PolygonArea(polygon)
	fmt.Println("Polygon area:", area)
}

Make sure to install the "github.com/ChristopherDavenport/geometry" package using the following command before running the code:

go get github.com/ChristopherDavenport/geometry

This code uses the geometry package's LineIntersection and PolygonArea functions to calculate the line intersection and polygon area respectively. It demonstrates how to create line and polygon objects with their respective points/vertices. Finally, it prints the intersection point and the polygon area.