This library provides an affine fit transformation for a given point by taking in a set of "to and from coordinates". This is based on a Research Paper by Helmuth Spath, which was adapted to Python by Jarno Elonen.
To use this library ensure you have included affinity.js and its dependency sylvester.js in your project.
Supply a list of from points and to points into a new instance of the object. Then call the objects accompanying methods to perform the desired operations. To transform a point to the targets system we can use the transform([x,y]); call.
Example:
var point = [5,9];
var from_points = [[1,1],[1,2],[2,2],[2,1]];
var to_points = [[4,4],[6,6],[8,4],[6,2]];
var transform_matrix = new AffineTransformation(from_points, to_points);
var result = transform_matrix.transform(point);
console.log("The point on the resultant matrix is:", result);
// Output: The point on the resultant matrix is: [28.000000000000004, 12.000000000000028]Another use case for this library is when you want to go from resulting points to original points. In this case we can use the inverseTransform([x,y]); call.
Example:
var point = [5,9];
var from_points = [[1,1],[1,2],[2,2],[2,1]];
var to_points = [[4,4],[6,6],[8,4],[6,2]];
var transform_matrix = new AffineTransformation(from_points, to_points);
var result = transform_matrix.inverseTransform(point);
console.log("The point on the resultant matrix is:", result);
// Output: The point on the resultant matrix is: [5.551115123125783e-16, 2.5000000000000018]While I will take care to modify and keep this libray up to date, it is encouraged for everyone to help out and make this library work more efficiently.
This library is available under the "Do What The Fuck You Want To Public License (WTFPL)" agreement. Feel free to copy/modify/distribute this library.