gistfile1.js

// take a list and return a newArray(...) command
function join(list) {
	result = "newArray(";
	for (i = 0; i < list.length; i++) {
		if (i > 0)
			result = result + ", ";
		result = result + list[i];
	}
	result = result + ")";
	return result;
}

function distance(x1, y1, x2, y2) {
	return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}

function distance2segment(x, y, x1, y1, x2, y2) {
	return distance(x, y, x1, y1) + distance(x, y, x2, y2);
}

function closestSegment(x, y, xList, yList) {
	best = -1;
	bestDistance = 9999999; // really large
	for (i = 0; i < xList.length - 1; i++) {
		distance = distace2segment(x, y, xList[i], yList[i], xList[i + 1], yList[i + 1]);
		if (bestDistance > distance) {
			bestDistance = distance;
			best = i;
		}
	}
	return best;
}

getSelectionCoordinates(x, y);
command = "makeSelection(" + selectionType + ", "
	+ join(x) + ", "
	+ join(y) + ");";
print(command);