Introduction to GeometryJS

GeometryJS is a powerful JavaScript library that simplifies geometric calculations and manipulations. It’s designed to be straightforward and highly efficient, making it an excellent choice for developers working on applications involving geometric data.

Key APIs and Examples

1. Creating Points and Vectors

GeometryJS allows you to create and manipulate points and vectors with ease.

 const pointA = new GeometryJS.Point(3, 4); const pointB = new GeometryJS.Point(5, 6); const vector = new GeometryJS.Vector(1, 2); 

2. Calculating Distances

Calculating the distance between two points is simple:

 const distance = pointA.distanceTo(pointB); console.log(`Distance: ${distance}`); 

3. Checking Point Within a Circle

Determine if a point lies within a given circle:

 const circle = new GeometryJS.Circle(new GeometryJS.Point(0, 0), 5); const isInside = circle.containsPoint(pointA); console.log(`Point A is inside the circle: ${isInside}`); 

4. Line Intersections

Finding the intersection point of two lines can be done like this:

 const line1 = new GeometryJS.Line(new GeometryJS.Point(0, 0), new GeometryJS.Point(1, 1)); const line2 = new GeometryJS.Line(new GeometryJS.Point(0, 1), new GeometryJS.Point(1, 0)); const intersection = line1.intersect(line2); console.log(`Intersection point: ${intersection}`); 

5. Triangle Area

Compute the area of a triangle:

 const triangle = new GeometryJS.Triangle(new GeometryJS.Point(0, 0), new GeometryJS.Point(4, 0), new GeometryJS.Point(0, 3)); const area = triangle.area(); console.log(`Triangle area: ${area}`); 

6. Polygon Perimeter

Finding the perimeter of a polygon:

 const polygon = new GeometryJS.Polygon([
  new GeometryJS.Point(0, 0),
  new GeometryJS.Point(4, 0),
  new GeometryJS.Point(4, 3),
  new GeometryJS.Point(0, 3)
]); const perimeter = polygon.perimeter(); console.log(`Polygon perimeter: ${perimeter}`); 

App Example

Let’s create a small application that makes use of some of the GeometryJS APIs introduced above.

 // Define points const points = [
  new GeometryJS.Point(2, 3),
  new GeometryJS.Point(5, 7),
  new GeometryJS.Point(6, 2)
];
// Create a triangle const triangle = new GeometryJS.Triangle(points[0], points[1], points[2]);
// Calculate triangle's area const triangleArea = triangle.area(); console.log(`Triangle area: ${triangleArea}`);
// Define a circle const circle = new GeometryJS.Circle(new GeometryJS.Point(0, 0), 10);
// Check if points are within the circle points.forEach(point => {
  const inside = circle.containsPoint(point);
  console.log(`Point (${point.x}, ${point.y}) inside circle: ${inside}`);
});
// Define two lines and their intersection point const lineA = new GeometryJS.Line(new GeometryJS.Point(0, 0), new GeometryJS.Point(3, 3)); const lineB = new GeometryJS.Line(new GeometryJS.Point(0, 3), new GeometryJS.Point(3, 0)); const intersectionPoint = lineA.intersect(lineB); console.log(`Intersection point: ${intersectionPoint}`); 

GeometryJS helps simplify both basic and advanced geometric computations, making it an ideal library for applications such as CAD programs, games, mathematical software, and more.

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