0845dea366
Since the transform method takes an arbitrary transform function, new coordinates may not be ordered in the same way as the originals.
102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
goog.provide('ol.Extent');
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goog.require('ol.Coordinate');
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goog.require('ol.Rectangle');
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goog.require('ol.TransformFunction');
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/**
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* Rectangular extent which is not rotated. An extent does not know its
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* projection.
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*
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* @constructor
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* @extends {ol.Rectangle}
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* @param {number} minX Minimum X.
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* @param {number} minY Minimum Y.
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* @param {number} maxX Maximum X.
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* @param {number} maxY Maximum Y.
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*/
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ol.Extent = function(minX, minY, maxX, maxY) {
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goog.base(this, minX, minY, maxX, maxY);
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};
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goog.inherits(ol.Extent, ol.Rectangle);
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/**
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* Builds an extent that includes all given coordinates.
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*
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* @param {...ol.Coordinate} var_args Coordinates.
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* @return {!ol.Extent} Bounding extent.
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*/
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ol.Extent.boundingExtent = function(var_args) {
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var coordinate0 = arguments[0];
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var extent = new ol.Extent(coordinate0.x, coordinate0.y,
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coordinate0.x, coordinate0.y);
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var i;
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for (i = 1; i < arguments.length; ++i) {
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var coordinate = arguments[i];
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extent.minX = Math.min(extent.minX, coordinate.x);
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extent.minY = Math.min(extent.minY, coordinate.y);
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extent.maxX = Math.max(extent.maxX, coordinate.x);
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extent.maxY = Math.max(extent.maxY, coordinate.y);
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}
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return extent;
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};
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/**
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* Checks if the given coordinate is contained or on the edge of the extent.
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @return {boolean} Contains.
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*/
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ol.Extent.prototype.contains = function(coordinate) {
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return this.minX <= coordinate.x && coordinate.x <= this.maxX &&
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this.minY <= coordinate.y && coordinate.y <= this.maxY;
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};
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/**
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* @return {ol.Coordinate} Bottom left coordinate.
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*/
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ol.Extent.prototype.getBottomLeft = function() {
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return new ol.Coordinate(this.minX, this.minY);
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};
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/**
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* @return {ol.Coordinate} Bottom right coordinate.
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*/
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ol.Extent.prototype.getBottomRight = function() {
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return new ol.Coordinate(this.maxX, this.minY);
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};
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/**
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* @return {ol.Coordinate} Top left coordinate.
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*/
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ol.Extent.prototype.getTopLeft = function() {
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return new ol.Coordinate(this.minX, this.maxY);
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};
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/**
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* @return {ol.Coordinate} Top right coordinate.
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*/
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ol.Extent.prototype.getTopRight = function() {
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return new ol.Coordinate(this.maxX, this.maxY);
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};
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/**
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* @param {ol.TransformFunction} transformFn Transform function.
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* @return {ol.Extent} Extent.
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*/
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ol.Extent.prototype.transform = function(transformFn) {
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var a = transformFn(new ol.Coordinate(this.minX, this.minY));
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var b = transformFn(new ol.Coordinate(this.maxX, this.maxY));
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return new ol.Extent(Math.min(a.x, b.x), Math.min(a.y, b.y),
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Math.max(a.x, b.x), Math.max(a.y, b.y));
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};
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