Merge pull request #337 from Turbo87/polyline
Added ol.parser.polyline module
This commit is contained in:
Tom Payne
335
src/ol/parser/polyline.js
Normal file
335
src/ol/parser/polyline.js
Normal file
@@ -0,0 +1,335 @@
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goog.provide('ol.parser.polyline');
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/**
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* Encode a list of coordinates in a flat array and return an encoded string
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*
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* Attention: This function will modify the passed array!
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*
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* @param {Array.<number>} flatPoints A flat array of coordinates.
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* @param {number=} opt_dimension The dimension of the coordinates in the array.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeFlatCoordinates =
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function(flatPoints, opt_dimension) {
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var dimension = opt_dimension || 2;
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return ol.parser.polyline.encodeDeltas(flatPoints, dimension);
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};
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/**
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* Decode a list of coordinates from an encoded string into a flat array
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*
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* @param {string} encoded An encoded string.
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* @param {number=} opt_dimension The dimension of the coordinates in the
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* encoded string.
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* @return {Array.<number>} A flat array of coordinates.
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*/
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ol.parser.polyline.decodeFlatCoordinates = function(encoded, opt_dimension) {
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var dimension = opt_dimension || 2;
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return ol.parser.polyline.decodeDeltas(encoded, dimension);
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};
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/**
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* Encode a list of n-dimensional points and return an encoded string
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*
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* Attention: This function will modify the passed array!
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*
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* @param {Array.<number>} numbers A list of n-dimensional points.
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* @param {number} dimension The dimension of the points in the list.
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* @param {number=} opt_factor The factor by which the numbers will be
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* multiplied. The remaining decimal places will get rounded away.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeDeltas = function(numbers, dimension, opt_factor) {
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var factor = opt_factor || 1e5;
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var d;
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var lastNumbers = new Array(dimension);
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for (d = 0; d < dimension; ++d) {
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lastNumbers[d] = 0;
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}
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength;) {
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for (d = 0; d < dimension; ++d, ++i) {
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var num = numbers[i];
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var delta = num - lastNumbers[d];
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lastNumbers[d] = num;
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numbers[i] = delta;
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}
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}
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return ol.parser.polyline.encodeFloats(numbers, factor);
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};
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/**
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* Decode a list of n-dimensional points from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @param {number} dimension The dimension of the points in the encoded string.
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* @param {number=} opt_factor The factor by which the resulting numbers will
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* be divided.
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* @return {Array.<number>} A list of n-dimensional points.
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*/
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ol.parser.polyline.decodeDeltas = function(encoded, dimension, opt_factor) {
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var factor = opt_factor || 1e5;
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var d;
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var lastNumbers = new Array(dimension);
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for (d = 0; d < dimension; ++d) {
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lastNumbers[d] = 0;
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}
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var numbers = ol.parser.polyline.decodeFloats(encoded, factor);
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength;) {
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for (d = 0; d < dimension; ++d, ++i) {
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lastNumbers[d] += numbers[i];
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numbers[i] = lastNumbers[d];
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}
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}
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return numbers;
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};
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/**
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* Encode a list of floating point numbers and return an encoded string
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*
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* Attention: This function will modify the passed array!
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*
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* @param {Array.<number>} numbers A list of floating point numbers.
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* @param {number=} opt_factor The factor by which the numbers will be
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* multiplied. The remaining decimal places will get rounded away.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeFloats = function(numbers, opt_factor) {
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var factor = opt_factor || 1e5;
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength; ++i) {
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numbers[i] = Math.round(numbers[i] * factor);
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}
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return ol.parser.polyline.encodeSignedIntegers(numbers);
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};
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/**
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* Decode a list of floating point numbers from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @param {number=} opt_factor The factor by which the result will be divided.
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* @return {Array.<number>} A list of floating point numbers.
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*/
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ol.parser.polyline.decodeFloats = function(encoded, opt_factor) {
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var factor = opt_factor || 1e5;
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var numbers = ol.parser.polyline.decodeSignedIntegers(encoded);
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength; ++i) {
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numbers[i] /= factor;
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}
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return numbers;
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};
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/**
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* Encode a list of signed integers and return an encoded string
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*
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* Attention: This function will modify the passed array!
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*
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* @param {Array.<number>} numbers A list of signed integers.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeSignedIntegers = function(numbers) {
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength; ++i) {
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var num = numbers[i];
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var signedNum = num << 1;
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if (num < 0) {
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signedNum = ~(signedNum);
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}
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numbers[i] = signedNum;
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}
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return ol.parser.polyline.encodeUnsignedIntegers(numbers);
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};
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/**
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* Decode a list of signed integers from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @return {Array.<number>} A list of signed integers.
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*/
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ol.parser.polyline.decodeSignedIntegers = function(encoded) {
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var numbers = ol.parser.polyline.decodeUnsignedIntegers(encoded);
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength; ++i) {
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var num = numbers[i];
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numbers[i] = (num & 1) ? ~(num >> 1) : (num >> 1);
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}
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return numbers;
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};
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/**
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* Encode a list of unsigned integers and return an encoded string
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*
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* @param {Array.<number>} numbers A list of unsigned integers.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeUnsignedIntegers = function(numbers) {
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var encoded = '';
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var numbersLength = numbers.length;
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for (var i = 0; i < numbersLength; ++i) {
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encoded += ol.parser.polyline.encodeUnsignedInteger(numbers[i]);
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}
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return encoded;
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};
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/**
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* Decode a list of unsigned integers from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @return {Array.<number>} A list of unsigned integers.
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*/
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ol.parser.polyline.decodeUnsignedIntegers = function(encoded) {
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var numbers = [];
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var current = 0;
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var shift = 0;
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var encodedLength = encoded.length;
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for (var i = 0; i < encodedLength; ++i) {
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var b = encoded.charCodeAt(i) - 63;
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current |= (b & 0x1f) << shift;
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if (b < 0x20) {
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numbers.push(current);
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current = 0;
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shift = 0;
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} else {
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shift += 5;
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}
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}
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return numbers;
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};
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/**
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* Encode one single floating point number and return an encoded string
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*
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* @param {number} num Floating point number that should be encoded.
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* @param {number=} opt_factor The factor by which num will be multiplied.
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* The remaining decimal places will get rounded away.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeFloat = function(num, opt_factor) {
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num = Math.round(num * (opt_factor || 1e5));
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return ol.parser.polyline.encodeSignedInteger(num);
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};
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/**
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* Decode one single floating point number from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @param {number=} opt_factor The factor by which the result will be divided.
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* @return {number} The decoded floating point number.
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*/
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ol.parser.polyline.decodeFloat = function(encoded, opt_factor) {
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var result = ol.parser.polyline.decodeSignedInteger(encoded);
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return result / (opt_factor || 1e5);
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};
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/**
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* Encode one single signed integer and return an encoded string
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*
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* @param {number} num Signed integer that should be encoded.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeSignedInteger = function(num) {
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var signedNum = num << 1;
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if (num < 0) {
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signedNum = ~(signedNum);
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}
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return ol.parser.polyline.encodeUnsignedInteger(signedNum);
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};
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/**
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* Decode one single signed integer from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @return {number} The decoded signed integer.
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*/
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ol.parser.polyline.decodeSignedInteger = function(encoded) {
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var result = ol.parser.polyline.decodeUnsignedInteger(encoded);
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return ((result & 1) ? ~(result >> 1) : (result >> 1));
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};
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/**
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* Encode one single unsigned integer and return an encoded string
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*
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* @param {number} num Unsigned integer that should be encoded.
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* @return {string} The encoded string.
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*/
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ol.parser.polyline.encodeUnsignedInteger = function(num) {
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var value, encoded = '';
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while (num >= 0x20) {
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value = (0x20 | (num & 0x1f)) + 63;
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encoded += (String.fromCharCode(value));
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num >>= 5;
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}
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value = num + 63;
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encoded += (String.fromCharCode(value));
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return encoded;
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};
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/**
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* Decode one single unsigned integer from an encoded string
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*
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* @param {string} encoded An encoded string.
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* @return {number} The decoded unsigned integer.
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*/
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ol.parser.polyline.decodeUnsignedInteger = function(encoded) {
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var result = 0;
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var shift = 0;
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var encodedLength = encoded.length;
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for (var i = 0; i < encodedLength; ++i) {
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var b = encoded.charCodeAt(i) - 63;
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result |= (b & 0x1f) << shift;
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if (b < 0x20)
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break;
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shift += 5;
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}
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return result;
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};
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262
test/spec/ol/parser/polyline.test.js
Normal file
262
test/spec/ol/parser/polyline.test.js
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@@ -0,0 +1,262 @@
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goog.provide('ol.test.parser.polyline');
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describe('ol.parser.polyline', function() {
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var flatPoints, encodedFlatPoints;
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var floats, smallFloats, encodedFloats;
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var signedIntegers, encodedSignedIntegers;
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var unsignedIntegers, encodedUnsignedIntegers;
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function resetTestingData() {
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flatPoints = [38.50000, -120.20000,
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40.70000, -120.95000,
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43.25200, -126.45300];
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encodedFlatPoints = '_p~iF~ps|U_ulLnnqC_mqNvxq`@';
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floats = [0.00, 0.15, -0.01, -0.16, 0.16, 0.01];
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smallFloats = [0.00000, 0.00015, -0.00001, -0.00016, 0.00016, 0.00001];
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encodedFloats = '?]@^_@A';
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signedIntegers = [0, 15, -1, -16, 16, 1];
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encodedSignedIntegers = '?]@^_@A';
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unsignedIntegers = [0, 30, 1, 31, 32, 2, 174];
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encodedUnsignedIntegers = '?]@^_@AmD';
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}
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// Reset testing data
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beforeEach(resetTestingData);
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describe('encodeFlatCoordinates', function() {
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it('returns expected value', function() {
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var encodeFlatCoordinates = ol.parser.polyline.encodeFlatCoordinates;
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// from the "Encoded Polyline Algorithm Format" page at Google
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expect(encodeFlatCoordinates(flatPoints)).toEqual(encodedFlatPoints);
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});
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});
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describe('decodeFlatCoordinates', function() {
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it('returns expected value', function() {
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var decodeFlatCoordinates = ol.parser.polyline.decodeFlatCoordinates;
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// from the "Encoded Polyline Algorithm Format" page at Google
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expect(decodeFlatCoordinates(encodedFlatPoints)).toEqual(flatPoints);
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});
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});
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describe('encodeDeltas', function() {
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it('returns expected value', function() {
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var encodeDeltas = ol.parser.polyline.encodeDeltas;
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expect(encodeDeltas(flatPoints, 2)).toEqual(encodedFlatPoints);
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});
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});
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describe('decodeDeltas', function() {
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it('returns expected value', function() {
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var decodeDeltas = ol.parser.polyline.decodeDeltas;
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expect(decodeDeltas(encodedFlatPoints, 2)).toEqual(flatPoints);
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});
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});
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describe('encodeFloats', function() {
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it('returns expected value', function() {
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var encodeFloats = ol.parser.polyline.encodeFloats;
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expect(encodeFloats(smallFloats)).toEqual(encodedFloats);
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resetTestingData();
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expect(encodeFloats(smallFloats, 1e5)).toEqual(encodedFloats);
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expect(encodeFloats(floats, 1e2)).toEqual(encodedFloats);
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});
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});
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describe('decodeFloats', function() {
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it('returns expected value', function() {
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var decodeFloats = ol.parser.polyline.decodeFloats;
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expect(decodeFloats(encodedFloats)).toEqual(smallFloats);
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expect(decodeFloats(encodedFloats, 1e5)).toEqual(smallFloats);
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expect(decodeFloats(encodedFloats, 1e2)).toEqual(floats);
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});
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});
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||||
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||||
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||||
|
||||
describe('encodeSignedIntegers', function() {
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||||
it('returns expected value', function() {
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||||
var encodeSignedIntegers = ol.parser.polyline.encodeSignedIntegers;
|
||||
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||||
expect(encodeSignedIntegers(
|
||||
signedIntegers)).toEqual(encodedSignedIntegers);
|
||||
});
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||||
});
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||||
|
||||
describe('decodeSignedIntegers', function() {
|
||||
it('returns expected value', function() {
|
||||
var decodeSignedIntegers = ol.parser.polyline.decodeSignedIntegers;
|
||||
|
||||
expect(decodeSignedIntegers(
|
||||
encodedSignedIntegers)).toEqual(signedIntegers);
|
||||
});
|
||||
});
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||||
|
||||
|
||||
|
||||
describe('encodeUnsignedIntegers', function() {
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||||
it('returns expected value', function() {
|
||||
var encodeUnsignedIntegers = ol.parser.polyline.encodeUnsignedIntegers;
|
||||
|
||||
expect(encodeUnsignedIntegers(
|
||||
unsignedIntegers)).toEqual(encodedUnsignedIntegers);
|
||||
});
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||||
});
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||||
|
||||
describe('decodeUnsignedIntegers', function() {
|
||||
it('returns expected value', function() {
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||||
var decodeUnsignedIntegers = ol.parser.polyline.decodeUnsignedIntegers;
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||||
|
||||
expect(decodeUnsignedIntegers(
|
||||
encodedUnsignedIntegers)).toEqual(unsignedIntegers);
|
||||
});
|
||||
});
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||||
|
||||
|
||||
|
||||
describe('encodeFloat', function() {
|
||||
it('returns expected value', function() {
|
||||
var encodeFloat = ol.parser.polyline.encodeFloat;
|
||||
|
||||
expect(encodeFloat(0.00000)).toEqual('?');
|
||||
expect(encodeFloat(-0.00001)).toEqual('@');
|
||||
expect(encodeFloat(0.00001)).toEqual('A');
|
||||
expect(encodeFloat(-0.00002)).toEqual('B');
|
||||
expect(encodeFloat(0.00002)).toEqual('C');
|
||||
expect(encodeFloat(0.00015)).toEqual(']');
|
||||
expect(encodeFloat(-0.00016)).toEqual('^');
|
||||
|
||||
expect(encodeFloat(-0.1, 10)).toEqual('@');
|
||||
expect(encodeFloat(0.1, 10)).toEqual('A');
|
||||
|
||||
expect(encodeFloat(16 * 32 / 1e5)).toEqual('__@');
|
||||
expect(encodeFloat(16 * 32 * 32 / 1e5)).toEqual('___@');
|
||||
|
||||
// from the "Encoded Polyline Algorithm Format" page at Google
|
||||
expect(encodeFloat(-179.9832104)).toEqual('`~oia@');
|
||||
});
|
||||
});
|
||||
|
||||
describe('decodeFloat', function() {
|
||||
it('returns expected value', function() {
|
||||
var decodeFloat = ol.parser.polyline.decodeFloat;
|
||||
|
||||
expect(decodeFloat('?')).toEqual(0.00000);
|
||||
expect(decodeFloat('@')).toEqual(-0.00001);
|
||||
expect(decodeFloat('A')).toEqual(0.00001);
|
||||
expect(decodeFloat('B')).toEqual(-0.00002);
|
||||
expect(decodeFloat('C')).toEqual(0.00002);
|
||||
expect(decodeFloat(']')).toEqual(0.00015);
|
||||
expect(decodeFloat('^')).toEqual(-0.00016);
|
||||
|
||||
expect(decodeFloat('@', 10)).toEqual(-0.1);
|
||||
expect(decodeFloat('A', 10)).toEqual(0.1);
|
||||
|
||||
expect(decodeFloat('__@')).toEqual(16 * 32 / 1e5);
|
||||
expect(decodeFloat('___@')).toEqual(16 * 32 * 32 / 1e5);
|
||||
|
||||
// from the "Encoded Polyline Algorithm Format" page at Google
|
||||
expect(decodeFloat('`~oia@')).toEqual(-179.98321);
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
describe('encodeSignedInteger', function() {
|
||||
it('returns expected value', function() {
|
||||
var encodeSignedInteger = ol.parser.polyline.encodeSignedInteger;
|
||||
|
||||
expect(encodeSignedInteger(0)).toEqual('?');
|
||||
expect(encodeSignedInteger(-1)).toEqual('@');
|
||||
expect(encodeSignedInteger(1)).toEqual('A');
|
||||
expect(encodeSignedInteger(-2)).toEqual('B');
|
||||
expect(encodeSignedInteger(2)).toEqual('C');
|
||||
expect(encodeSignedInteger(15)).toEqual(']');
|
||||
expect(encodeSignedInteger(-16)).toEqual('^');
|
||||
|
||||
expect(encodeSignedInteger(16)).toEqual('_@');
|
||||
expect(encodeSignedInteger(16 * 32)).toEqual('__@');
|
||||
expect(encodeSignedInteger(16 * 32 * 32)).toEqual('___@');
|
||||
});
|
||||
});
|
||||
|
||||
describe('decodeSignedInteger', function() {
|
||||
it('returns expected value', function() {
|
||||
var decodeSignedInteger = ol.parser.polyline.decodeSignedInteger;
|
||||
|
||||
expect(decodeSignedInteger('?')).toEqual(0);
|
||||
expect(decodeSignedInteger('@')).toEqual(-1);
|
||||
expect(decodeSignedInteger('A')).toEqual(1);
|
||||
expect(decodeSignedInteger('B')).toEqual(-2);
|
||||
expect(decodeSignedInteger('C')).toEqual(2);
|
||||
expect(decodeSignedInteger(']')).toEqual(15);
|
||||
expect(decodeSignedInteger('^')).toEqual(-16);
|
||||
|
||||
expect(decodeSignedInteger('_@')).toEqual(16);
|
||||
expect(decodeSignedInteger('__@')).toEqual(16 * 32);
|
||||
expect(decodeSignedInteger('___@')).toEqual(16 * 32 * 32);
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
describe('encodeUnsignedInteger', function() {
|
||||
it('returns expected value', function() {
|
||||
var encodeUnsignedInteger = ol.parser.polyline.encodeUnsignedInteger;
|
||||
|
||||
expect(encodeUnsignedInteger(0)).toEqual('?');
|
||||
expect(encodeUnsignedInteger(1)).toEqual('@');
|
||||
expect(encodeUnsignedInteger(2)).toEqual('A');
|
||||
expect(encodeUnsignedInteger(30)).toEqual(']');
|
||||
expect(encodeUnsignedInteger(31)).toEqual('^');
|
||||
expect(encodeUnsignedInteger(32)).toEqual('_@');
|
||||
|
||||
expect(encodeUnsignedInteger(32 * 32)).toEqual('__@');
|
||||
expect(encodeUnsignedInteger(5 * 32 * 32)).toEqual('__D');
|
||||
expect(encodeUnsignedInteger(32 * 32 * 32)).toEqual('___@');
|
||||
|
||||
// from the "Encoded Polyline Algorithm Format" page at Google
|
||||
expect(encodeUnsignedInteger(174)).toEqual('mD');
|
||||
});
|
||||
});
|
||||
|
||||
describe('decodeUnsignedInteger', function() {
|
||||
it('returns expected value', function() {
|
||||
var decodeUnsignedInteger = ol.parser.polyline.decodeUnsignedInteger;
|
||||
|
||||
expect(decodeUnsignedInteger('?')).toEqual(0);
|
||||
expect(decodeUnsignedInteger('@')).toEqual(1);
|
||||
expect(decodeUnsignedInteger('A')).toEqual(2);
|
||||
expect(decodeUnsignedInteger(']')).toEqual(30);
|
||||
expect(decodeUnsignedInteger('^')).toEqual(31);
|
||||
expect(decodeUnsignedInteger('_@')).toEqual(32);
|
||||
|
||||
expect(decodeUnsignedInteger('__@')).toEqual(32 * 32);
|
||||
expect(decodeUnsignedInteger('__D')).toEqual(5 * 32 * 32);
|
||||
expect(decodeUnsignedInteger('___@')).toEqual(32 * 32 * 32);
|
||||
|
||||
// from the "Encoded Polyline Algorithm Format" page at Google
|
||||
expect(decodeUnsignedInteger('mD')).toEqual(174);
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
goog.require('ol.parser.polyline');
|
||||
Reference in New Issue
Block a user