agusmade · December 25, 2022 08:27
diff --git a/polygon-area.js b/polygon-area.js
 function polygonArea(X, Y) {
  var area = 0;  // Accumulates area in the loop
  var numPoints = X.length;
  var j = numPoints-1;  // The last vertex is the 'previous' one to the first

  for (var i=0; i<numPoints; i++) {
    area = area +  (X[j]+X[i]) * (Y[j]-Y[i]);
    j = i;  //j is previous vertex to i
  }   
  return area/2;
 }

 var xPts = [3, 3, 2, 2];
 var yPts = [2, 4, 4, 5];

 var a = polygonArea(xPts, yPts);
 console.log("Area  = " + a);
	function polygonArea(X, Y) {
	var area = 0; // Accumulates area in the loop
	var numPoints = X.length;
	var j = numPoints-1; // The last vertex is the 'previous' one to the first

	for (var i=0; i<numPoints; i++) {
	area = area + (X[j]+X[i]) * (Y[j]-Y[i]);
	j = i; //j is previous vertex to i
	}
	return area/2;
	}

	var xPts = [3, 3, 2, 2];
	var yPts = [2, 4, 4, 5];

	var a = polygonArea(xPts, yPts);
	console.log("Area = " + a);
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