olivierlando / path-from-image Goto Github PK

I keep getting this error on a basic project build : Uncaught TypeError: Invalid attempt to destructure non-iterable instance

On closer inspection, this error is being generated from:

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

in the PathFromImage.js file.

It seems like:

           value: function path(_ref, _ref2, tolerance) {
           var _ref4 = _slicedToArray(_ref, 2),
           x1 = _ref4[0],
           y1 = _ref4[1];

is the root cause, specifically line 2.

Any ideas on how can this be resolved? Thanks

Hi @olivierlando, I have installed this excellent package for my test application, however when I am testing the code functionality with the example you proved (and with the same image) I am getting different co-ordinates from the ones you are expecting to get.

Instead of these co-ordinates [62, 413], [63, 406], [69, 390], I am getting:

[63, 294], [69, 288], [95, 292], [121, 304]...

I am using the exact same test code you provided:

 `const fs = require('fs');
 const jpeg = require('jpeg-js');
 const PathFromImage = require('path-from-image');

  const bluePointCoords = [62, 413];
 const redPointCoords = [514, 39];

 const image = jpeg.decode(fs.readFileSync('road.jpg'), true);
 const pathFromImage = new PathFromImage({
   width: image.width,
   height: image.height,
   imageData: image.data,
   colorPatterns: [{ r: [60, 255], g: [0, 70], b: [60, 255] }], // description of the mauve / ping color
 });
 const path = pathFromImage.path(bluePointCoords, redPointCoords); 

Any reason for such a discrepancy? Thanks

Hi @olivierlando

I am using your excellent package 'Path-from Image for a small project I am doing. It does the job quite well! I have been trying to modify it slightly to my needs for the last few weeks, however to no avail.

I am a relative beginner and struggling to understand all the code. I would like to know, if possible, how to increase the step size for the co-ordinates returned.

I have attached an image which shows from the 3rd to 4th co-ordinates, only a -8 change in the x direction. I would like to increase this such that, only changes >10 or >20 only show up. Is this possible?

I would be extremely grateful if you could point me in the right direction to perform this task.

Thanks and Regards,

Ryan