348 lines
10 KiB
JavaScript
348 lines
10 KiB
JavaScript
goog.provide('ol.coordinate');
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goog.require('ol.math');
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goog.require('ol.string');
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/**
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* Add `delta` to `coordinate`. `coordinate` is modified in place and returned
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* by the function.
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*
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* Example:
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*
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* var coord = [7.85, 47.983333];
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* ol.coordinate.add(coord, [-2, 4]);
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* // coord is now [5.85, 51.983333]
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {ol.Coordinate} delta Delta.
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* @return {ol.Coordinate} The input coordinate adjusted by the given delta.
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* @api
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*/
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ol.coordinate.add = function(coordinate, delta) {
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coordinate[0] += delta[0];
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coordinate[1] += delta[1];
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return coordinate;
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};
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/**
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* Calculates the point closest to the passed coordinate on the passed segment.
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* This is the foot of the perpendicular of the coordinate to the segment when
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* the foot is on the segment, or the closest segment coordinate when the foot
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* is outside the segment.
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*
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* @param {ol.Coordinate} coordinate The coordinate.
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* @param {Array.<ol.Coordinate>} segment The two coordinates of the segment.
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* @return {ol.Coordinate} The foot of the perpendicular of the coordinate to
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* the segment.
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*/
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ol.coordinate.closestOnSegment = function(coordinate, segment) {
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var x0 = coordinate[0];
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var y0 = coordinate[1];
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var start = segment[0];
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var end = segment[1];
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var x1 = start[0];
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var y1 = start[1];
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var x2 = end[0];
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var y2 = end[1];
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var dx = x2 - x1;
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var dy = y2 - y1;
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var along = (dx === 0 && dy === 0) ? 0 :
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((dx * (x0 - x1)) + (dy * (y0 - y1))) / ((dx * dx + dy * dy) || 0);
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var x, y;
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if (along <= 0) {
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x = x1;
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y = y1;
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} else if (along >= 1) {
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x = x2;
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y = y2;
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} else {
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x = x1 + along * dx;
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y = y1 + along * dy;
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}
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return [x, y];
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};
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/**
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* Returns a {@link ol.CoordinateFormatType} function that can be used to format
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* a {ol.Coordinate} to a string.
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*
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* Example without specifying the fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var stringifyFunc = ol.coordinate.createStringXY();
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* var out = stringifyFunc(coord);
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* // out is now '8, 48'
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*
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* Example with explicitly specifying 2 fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var stringifyFunc = ol.coordinate.createStringXY(2);
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* var out = stringifyFunc(coord);
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* // out is now '7.85, 47.98'
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*
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* @param {number=} opt_fractionDigits The number of digits to include
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* after the decimal point. Default is `0`.
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* @return {ol.CoordinateFormatType} Coordinate format.
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* @api
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*/
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ol.coordinate.createStringXY = function(opt_fractionDigits) {
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return (
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/**
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* @param {ol.Coordinate|undefined} coordinate Coordinate.
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* @return {string} String XY.
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*/
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function(coordinate) {
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return ol.coordinate.toStringXY(coordinate, opt_fractionDigits);
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});
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};
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/**
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* @private
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* @param {number} degrees Degrees.
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* @param {string} hemispheres Hemispheres.
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* @param {number=} opt_fractionDigits The number of digits to include
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* after the decimal point. Default is `0`.
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* @return {string} String.
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*/
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ol.coordinate.degreesToStringHDMS_ = function(degrees, hemispheres, opt_fractionDigits) {
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var normalizedDegrees = ol.math.modulo(degrees + 180, 360) - 180;
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var x = Math.abs(3600 * normalizedDegrees);
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var dflPrecision = opt_fractionDigits || 0;
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var precision = Math.pow(10, dflPrecision);
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var deg = Math.floor(x / 3600);
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var min = Math.floor((x - deg * 3600) / 60);
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var sec = x - (deg * 3600) - (min * 60);
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sec = Math.ceil(sec * precision) / precision;
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if (sec >= 60) {
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sec = 0;
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min += 1;
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}
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if (min >= 60) {
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min = 0;
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deg += 1;
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}
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return deg + '\u00b0 ' + ol.string.padNumber(min, 2) + '\u2032 ' +
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ol.string.padNumber(sec, 2, dflPrecision) + '\u2033 ' +
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hemispheres.charAt(normalizedDegrees < 0 ? 1 : 0);
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};
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/**
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* Transforms the given {@link ol.Coordinate} to a string using the given string
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* template. The strings `{x}` and `{y}` in the template will be replaced with
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* the first and second coordinate values respectively.
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*
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* Example without specifying the fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var template = 'Coordinate is ({x}|{y}).';
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* var out = ol.coordinate.format(coord, template);
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* // out is now 'Coordinate is (8|48).'
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*
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* Example explicitly specifying the fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var template = 'Coordinate is ({x}|{y}).';
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* var out = ol.coordinate.format(coord, template, 2);
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* // out is now 'Coordinate is (7.85|47.98).'
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*
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* @param {ol.Coordinate|undefined} coordinate Coordinate.
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* @param {string} template A template string with `{x}` and `{y}` placeholders
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* that will be replaced by first and second coordinate values.
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* @param {number=} opt_fractionDigits The number of digits to include
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* after the decimal point. Default is `0`.
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* @return {string} Formatted coordinate.
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* @api
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*/
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ol.coordinate.format = function(coordinate, template, opt_fractionDigits) {
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if (coordinate) {
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return template
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.replace('{x}', coordinate[0].toFixed(opt_fractionDigits))
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.replace('{y}', coordinate[1].toFixed(opt_fractionDigits));
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} else {
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return '';
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}
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};
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/**
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* @param {ol.Coordinate} coordinate1 First coordinate.
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* @param {ol.Coordinate} coordinate2 Second coordinate.
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* @return {boolean} Whether the passed coordinates are equal.
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*/
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ol.coordinate.equals = function(coordinate1, coordinate2) {
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var equals = true;
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for (var i = coordinate1.length - 1; i >= 0; --i) {
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if (coordinate1[i] != coordinate2[i]) {
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equals = false;
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break;
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}
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}
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return equals;
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};
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/**
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* Rotate `coordinate` by `angle`. `coordinate` is modified in place and
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* returned by the function.
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*
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* Example:
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*
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* var coord = [7.85, 47.983333];
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* var rotateRadians = Math.PI / 2; // 90 degrees
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* ol.coordinate.rotate(coord, rotateRadians);
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* // coord is now [-47.983333, 7.85]
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {number} angle Angle in radian.
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* @return {ol.Coordinate} Coordinate.
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* @api
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*/
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ol.coordinate.rotate = function(coordinate, angle) {
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var cosAngle = Math.cos(angle);
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var sinAngle = Math.sin(angle);
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var x = coordinate[0] * cosAngle - coordinate[1] * sinAngle;
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var y = coordinate[1] * cosAngle + coordinate[0] * sinAngle;
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coordinate[0] = x;
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coordinate[1] = y;
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return coordinate;
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};
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/**
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* Scale `coordinate` by `scale`. `coordinate` is modified in place and returned
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* by the function.
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*
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* Example:
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*
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* var coord = [7.85, 47.983333];
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* var scale = 1.2;
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* ol.coordinate.scale(coord, scale);
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* // coord is now [9.42, 57.5799996]
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {number} scale Scale factor.
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* @return {ol.Coordinate} Coordinate.
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*/
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ol.coordinate.scale = function(coordinate, scale) {
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coordinate[0] *= scale;
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coordinate[1] *= scale;
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return coordinate;
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};
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/**
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* Subtract `delta` to `coordinate`. `coordinate` is modified in place and
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* returned by the function.
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {ol.Coordinate} delta Delta.
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* @return {ol.Coordinate} Coordinate.
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*/
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ol.coordinate.sub = function(coordinate, delta) {
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coordinate[0] -= delta[0];
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coordinate[1] -= delta[1];
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return coordinate;
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};
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/**
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* @param {ol.Coordinate} coord1 First coordinate.
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* @param {ol.Coordinate} coord2 Second coordinate.
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* @return {number} Squared distance between coord1 and coord2.
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*/
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ol.coordinate.squaredDistance = function(coord1, coord2) {
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var dx = coord1[0] - coord2[0];
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var dy = coord1[1] - coord2[1];
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return dx * dx + dy * dy;
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};
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/**
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* @param {ol.Coordinate} coord1 First coordinate.
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* @param {ol.Coordinate} coord2 Second coordinate.
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* @return {number} Distance between coord1 and coord2.
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*/
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ol.coordinate.distance = function(coord1, coord2) {
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return Math.sqrt(ol.coordinate.squaredDistance(coord1, coord2));
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};
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/**
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* Calculate the squared distance from a coordinate to a line segment.
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*
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* @param {ol.Coordinate} coordinate Coordinate of the point.
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* @param {Array.<ol.Coordinate>} segment Line segment (2 coordinates).
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* @return {number} Squared distance from the point to the line segment.
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*/
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ol.coordinate.squaredDistanceToSegment = function(coordinate, segment) {
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return ol.coordinate.squaredDistance(coordinate,
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ol.coordinate.closestOnSegment(coordinate, segment));
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};
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/**
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* Format a geographic coordinate with the hemisphere, degrees, minutes, and
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* seconds.
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*
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* Example without specifying fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var out = ol.coordinate.toStringHDMS(coord);
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* // out is now '47° 58′ 60″ N 7° 50′ 60″ E'
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*
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* Example explicitly specifying 1 fractional digit:
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*
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* var coord = [7.85, 47.983333];
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* var out = ol.coordinate.toStringHDMS(coord, 1);
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* // out is now '47° 58′ 60.0″ N 7° 50′ 60.0″ E'
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*
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* @param {ol.Coordinate|undefined} coordinate Coordinate.
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* @param {number=} opt_fractionDigits The number of digits to include
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* after the decimal point. Default is `0`.
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* @return {string} Hemisphere, degrees, minutes and seconds.
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* @api
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*/
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ol.coordinate.toStringHDMS = function(coordinate, opt_fractionDigits) {
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if (coordinate) {
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return ol.coordinate.degreesToStringHDMS_(coordinate[1], 'NS', opt_fractionDigits) + ' ' +
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ol.coordinate.degreesToStringHDMS_(coordinate[0], 'EW', opt_fractionDigits);
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} else {
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return '';
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}
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};
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/**
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* Format a coordinate as a comma delimited string.
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*
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* Example without specifying fractional digits:
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*
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* var coord = [7.85, 47.983333];
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* var out = ol.coordinate.toStringXY(coord);
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* // out is now '8, 48'
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*
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* Example explicitly specifying 1 fractional digit:
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*
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* var coord = [7.85, 47.983333];
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* var out = ol.coordinate.toStringXY(coord, 1);
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* // out is now '7.8, 48.0'
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*
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* @param {ol.Coordinate|undefined} coordinate Coordinate.
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* @param {number=} opt_fractionDigits The number of digits to include
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* after the decimal point. Default is `0`.
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* @return {string} XY.
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* @api
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*/
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ol.coordinate.toStringXY = function(coordinate, opt_fractionDigits) {
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return ol.coordinate.format(coordinate, '{x}, {y}', opt_fractionDigits);
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};
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