openlayers
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Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.extent');
goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.extent.Corner');
goog.require('ol.extent.Relationship');
/**
* Build an extent that includes all given coordinates.
*
* @param {Array.<ol.Coordinate>} coordinates Coordinates.
* @return {ol.Extent} Bounding extent.
* @api stable
*/
ol.extent.boundingExtent = function(coordinates) {
var extent = ol.extent.createEmpty();
for (var i = 0, ii = coordinates.length; i < ii; ++i) {
ol.extent.extendCoordinate(extent, coordinates[i]);
}
return extent;
};
/**
* @param {Array.<number>} xs Xs.
* @param {Array.<number>} ys Ys.
* @param {ol.Extent=} opt_extent Destination extent.
* @private
* @return {ol.Extent} Extent.
*/
ol.extent.boundingExtentXYs_ = function(xs, ys, opt_extent) {
ol.DEBUG && console.assert(xs.length > 0, 'xs length should be larger than 0');
ol.DEBUG && console.assert(ys.length > 0, 'ys length should be larger than 0');
var minX = Math.min.apply(null, xs);
var minY = Math.min.apply(null, ys);
var maxX = Math.max.apply(null, xs);
var maxY = Math.max.apply(null, ys);
return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};
/**
* Return extent increased by the provided value.
* @param {ol.Extent} extent Extent.
* @param {number} value The amount by which the extent should be buffered.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
* @api stable
*/
ol.extent.buffer = function(extent, value, opt_extent) {
if (opt_extent) {
opt_extent[0] = extent[0] - value;
opt_extent[1] = extent[1] - value;
opt_extent[2] = extent[2] + value;
opt_extent[3] = extent[3] + value;
return opt_extent;
} else {
return [
extent[0] - value,
extent[1] - value,
extent[2] + value,
extent[3] + value
];
}
};
/**
* Creates a clone of an extent.
*
* @param {ol.Extent} extent Extent to clone.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} The clone.
*/
ol.extent.clone = function(extent, opt_extent) {
if (opt_extent) {
opt_extent[0] = extent[0];
opt_extent[1] = extent[1];
opt_extent[2] = extent[2];
opt_extent[3] = extent[3];
return opt_extent;
} else {
return extent.slice();
}
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} x X.
* @param {number} y Y.
* @return {number} Closest squared distance.
*/
ol.extent.closestSquaredDistanceXY = function(extent, x, y) {
var dx, dy;
if (x < extent[0]) {
dx = extent[0] - x;
} else if (extent[2] < x) {
dx = x - extent[2];
} else {
dx = 0;
}
if (y < extent[1]) {
dy = extent[1] - y;
} else if (extent[3] < y) {
dy = y - extent[3];
} else {
dy = 0;
}
return dx * dx + dy * dy;
};
/**
* Check if the passed coordinate is contained or on the edge of the extent.
*
* @param {ol.Extent} extent Extent.
* @param {ol.Coordinate} coordinate Coordinate.
* @return {boolean} The coordinate is contained in the extent.
* @api stable
*/
ol.extent.containsCoordinate = function(extent, coordinate) {
return ol.extent.containsXY(extent, coordinate[0], coordinate[1]);
};
/**
* Check if one extent contains another.
*
* An extent is deemed contained if it lies completely within the other extent,
* including if they share one or more edges.
*
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @return {boolean} The second extent is contained by or on the edge of the
* first.
* @api stable
*/
ol.extent.containsExtent = function(extent1, extent2) {
return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&
extent1[1] <= extent2[1] && extent2[3] <= extent1[3];
};
/**
* Check if the passed coordinate is contained or on the edge of the extent.
*
* @param {ol.Extent} extent Extent.
* @param {number} x X coordinate.
* @param {number} y Y coordinate.
* @return {boolean} The x, y values are contained in the extent.
* @api stable
*/
ol.extent.containsXY = function(extent, x, y) {
return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];
};
/**
* Get the relationship between a coordinate and extent.
* @param {ol.Extent} extent The extent.
* @param {ol.Coordinate} coordinate The coordinate.
* @return {number} The relationship (bitwise compare with
* ol.extent.Relationship).
*/
ol.extent.coordinateRelationship = function(extent, coordinate) {
var minX = extent[0];
var minY = extent[1];
var maxX = extent[2];
var maxY = extent[3];
var x = coordinate[0];
var y = coordinate[1];
var relationship = ol.extent.Relationship.UNKNOWN;
if (x < minX) {
relationship = relationship | ol.extent.Relationship.LEFT;
} else if (x > maxX) {
relationship = relationship | ol.extent.Relationship.RIGHT;
}
if (y < minY) {
relationship = relationship | ol.extent.Relationship.BELOW;
} else if (y > maxY) {
relationship = relationship | ol.extent.Relationship.ABOVE;
}
if (relationship === ol.extent.Relationship.UNKNOWN) {
relationship = ol.extent.Relationship.INTERSECTING;
}
return relationship;
};
/**
* Create an empty extent.
* @return {ol.Extent} Empty extent.
* @api stable
*/
ol.extent.createEmpty = function() {
return [Infinity, Infinity, -Infinity, -Infinity];
};
/**
* Create a new extent or update the provided extent.
* @param {number} minX Minimum X.
* @param {number} minY Minimum Y.
* @param {number} maxX Maximum X.
* @param {number} maxY Maximum Y.
* @param {ol.Extent=} opt_extent Destination extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdate = function(minX, minY, maxX, maxY, opt_extent) {
if (opt_extent) {
opt_extent[0] = minX;
opt_extent[1] = minY;
opt_extent[2] = maxX;
opt_extent[3] = maxY;
return opt_extent;
} else {
return [minX, minY, maxX, maxY];
}
};
/**
* Create a new empty extent or make the provided one empty.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdateEmpty = function(opt_extent) {
return ol.extent.createOrUpdate(
Infinity, Infinity, -Infinity, -Infinity, opt_extent);
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdateFromCoordinate = function(coordinate, opt_extent) {
var x = coordinate[0];
var y = coordinate[1];
return ol.extent.createOrUpdate(x, y, x, y, opt_extent);
};
/**
* @param {Array.<ol.Coordinate>} coordinates Coordinates.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdateFromCoordinates = function(coordinates, opt_extent) {
var extent = ol.extent.createOrUpdateEmpty(opt_extent);
return ol.extent.extendCoordinates(extent, coordinates);
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdateFromFlatCoordinates = function(flatCoordinates, offset, end, stride, opt_extent) {
var extent = ol.extent.createOrUpdateEmpty(opt_extent);
return ol.extent.extendFlatCoordinates(
extent, flatCoordinates, offset, end, stride);
};
/**
* @param {Array.<Array.<ol.Coordinate>>} rings Rings.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.createOrUpdateFromRings = function(rings, opt_extent) {
var extent = ol.extent.createOrUpdateEmpty(opt_extent);
return ol.extent.extendRings(extent, rings);
};
/**
* Determine if two extents are equivalent.
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @return {boolean} The two extents are equivalent.
* @api stable
*/
ol.extent.equals = function(extent1, extent2) {
return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&
extent1[1] == extent2[1] && extent1[3] == extent2[3];
};
/**
* Modify an extent to include another extent.
* @param {ol.Extent} extent1 The extent to be modified.
* @param {ol.Extent} extent2 The extent that will be included in the first.
* @return {ol.Extent} A reference to the first (extended) extent.
* @api stable
*/
ol.extent.extend = function(extent1, extent2) {
if (extent2[0] < extent1[0]) {
extent1[0] = extent2[0];
}
if (extent2[2] > extent1[2]) {
extent1[2] = extent2[2];
}
if (extent2[1] < extent1[1]) {
extent1[1] = extent2[1];
}
if (extent2[3] > extent1[3]) {
extent1[3] = extent2[3];
}
return extent1;
};
/**
* @param {ol.Extent} extent Extent.
* @param {ol.Coordinate} coordinate Coordinate.
*/
ol.extent.extendCoordinate = function(extent, coordinate) {
if (coordinate[0] < extent[0]) {
extent[0] = coordinate[0];
}
if (coordinate[0] > extent[2]) {
extent[2] = coordinate[0];
}
if (coordinate[1] < extent[1]) {
extent[1] = coordinate[1];
}
if (coordinate[1] > extent[3]) {
extent[3] = coordinate[1];
}
};
/**
* @param {ol.Extent} extent Extent.
* @param {Array.<ol.Coordinate>} coordinates Coordinates.
* @return {ol.Extent} Extent.
*/
ol.extent.extendCoordinates = function(extent, coordinates) {
var i, ii;
for (i = 0, ii = coordinates.length; i < ii; ++i) {
ol.extent.extendCoordinate(extent, coordinates[i]);
}
return extent;
};
/**
* @param {ol.Extent} extent Extent.
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @return {ol.Extent} Extent.
*/
ol.extent.extendFlatCoordinates = function(extent, flatCoordinates, offset, end, stride) {
for (; offset < end; offset += stride) {
ol.extent.extendXY(
extent, flatCoordinates[offset], flatCoordinates[offset + 1]);
}
return extent;
};
/**
* @param {ol.Extent} extent Extent.
* @param {Array.<Array.<ol.Coordinate>>} rings Rings.
* @return {ol.Extent} Extent.
*/
ol.extent.extendRings = function(extent, rings) {
var i, ii;
for (i = 0, ii = rings.length; i < ii; ++i) {
ol.extent.extendCoordinates(extent, rings[i]);
}
return extent;
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} x X.
* @param {number} y Y.
*/
ol.extent.extendXY = function(extent, x, y) {
extent[0] = Math.min(extent[0], x);
extent[1] = Math.min(extent[1], y);
extent[2] = Math.max(extent[2], x);
extent[3] = Math.max(extent[3], y);
};
/**
* This function calls `callback` for each corner of the extent. If the
* callback returns a truthy value the function returns that value
* immediately. Otherwise the function returns `false`.
* @param {ol.Extent} extent Extent.
* @param {function(this:T, ol.Coordinate): S} callback Callback.
* @param {T=} opt_this Value to use as `this` when executing `callback`.
* @return {S|boolean} Value.
* @template S, T
*/
ol.extent.forEachCorner = function(extent, callback, opt_this) {
var val;
val = callback.call(opt_this, ol.extent.getBottomLeft(extent));
if (val) {
return val;
}
val = callback.call(opt_this, ol.extent.getBottomRight(extent));
if (val) {
return val;
}
val = callback.call(opt_this, ol.extent.getTopRight(extent));
if (val) {
return val;
}
val = callback.call(opt_this, ol.extent.getTopLeft(extent));
if (val) {
return val;
}
return false;
};
/**
* @param {ol.Extent} extent Extent.
* @return {number} Area.
*/
ol.extent.getArea = function(extent) {
var area = 0;
if (!ol.extent.isEmpty(extent)) {
area = ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
}
return area;
};
/**
* Get the bottom left coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @return {ol.Coordinate} Bottom left coordinate.
* @api stable
*/
ol.extent.getBottomLeft = function(extent) {
return [extent[0], extent[1]];
};
/**
* Get the bottom right coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @return {ol.Coordinate} Bottom right coordinate.
* @api stable
*/
ol.extent.getBottomRight = function(extent) {
return [extent[2], extent[1]];
};
/**
* Get the center coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @return {ol.Coordinate} Center.
* @api stable
*/
ol.extent.getCenter = function(extent) {
return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];
};
/**
* Get a corner coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @param {ol.extent.Corner} corner Corner.
* @return {ol.Coordinate} Corner coordinate.
*/
ol.extent.getCorner = function(extent, corner) {
var coordinate;
if (corner === ol.extent.Corner.BOTTOM_LEFT) {
coordinate = ol.extent.getBottomLeft(extent);
} else if (corner === ol.extent.Corner.BOTTOM_RIGHT) {
coordinate = ol.extent.getBottomRight(extent);
} else if (corner === ol.extent.Corner.TOP_LEFT) {
coordinate = ol.extent.getTopLeft(extent);
} else if (corner === ol.extent.Corner.TOP_RIGHT) {
coordinate = ol.extent.getTopRight(extent);
} else {
ol.asserts.assert(false, 13); // Invalid corner
}
return /** @type {!ol.Coordinate} */ (coordinate);
};
/**
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @return {number} Enlarged area.
*/
ol.extent.getEnlargedArea = function(extent1, extent2) {
var minX = Math.min(extent1[0], extent2[0]);
var minY = Math.min(extent1[1], extent2[1]);
var maxX = Math.max(extent1[2], extent2[2]);
var maxY = Math.max(extent1[3], extent2[3]);
return (maxX - minX) * (maxY - minY);
};
/**
* @param {ol.Coordinate} center Center.
* @param {number} resolution Resolution.
* @param {number} rotation Rotation.
* @param {ol.Size} size Size.
* @param {ol.Extent=} opt_extent Destination extent.
* @return {ol.Extent} Extent.
*/
ol.extent.getForViewAndSize = function(center, resolution, rotation, size, opt_extent) {
var dx = resolution * size[0] / 2;
var dy = resolution * size[1] / 2;
var cosRotation = Math.cos(rotation);
var sinRotation = Math.sin(rotation);
var xCos = dx * cosRotation;
var xSin = dx * sinRotation;
var yCos = dy * cosRotation;
var ySin = dy * sinRotation;
var x = center[0];
var y = center[1];
var x0 = x - xCos + ySin;
var x1 = x - xCos - ySin;
var x2 = x + xCos - ySin;
var x3 = x + xCos + ySin;
var y0 = y - xSin - yCos;
var y1 = y - xSin + yCos;
var y2 = y + xSin + yCos;
var y3 = y + xSin - yCos;
return ol.extent.createOrUpdate(
Math.min(x0, x1, x2, x3), Math.min(y0, y1, y2, y3),
Math.max(x0, x1, x2, x3), Math.max(y0, y1, y2, y3),
opt_extent);
};
/**
* Get the height of an extent.
* @param {ol.Extent} extent Extent.
* @return {number} Height.
* @api stable
*/
ol.extent.getHeight = function(extent) {
return extent[3] - extent[1];
};
/**
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @return {number} Intersection area.
*/
ol.extent.getIntersectionArea = function(extent1, extent2) {
var intersection = ol.extent.getIntersection(extent1, extent2);
return ol.extent.getArea(intersection);
};
/**
* Get the intersection of two extents.
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @param {ol.Extent=} opt_extent Optional extent to populate with intersection.
* @return {ol.Extent} Intersecting extent.
* @api stable
*/
ol.extent.getIntersection = function(extent1, extent2, opt_extent) {
var intersection = opt_extent ? opt_extent : ol.extent.createEmpty();
if (ol.extent.intersects(extent1, extent2)) {
if (extent1[0] > extent2[0]) {
intersection[0] = extent1[0];
} else {
intersection[0] = extent2[0];
}
if (extent1[1] > extent2[1]) {
intersection[1] = extent1[1];
} else {
intersection[1] = extent2[1];
}
if (extent1[2] < extent2[2]) {
intersection[2] = extent1[2];
} else {
intersection[2] = extent2[2];
}
if (extent1[3] < extent2[3]) {
intersection[3] = extent1[3];
} else {
intersection[3] = extent2[3];
}
}
return intersection;
};
/**
* @param {ol.Extent} extent Extent.
* @return {number} Margin.
*/
ol.extent.getMargin = function(extent) {
return ol.extent.getWidth(extent) + ol.extent.getHeight(extent);
};
/**
* Get the size (width, height) of an extent.
* @param {ol.Extent} extent The extent.
* @return {ol.Size} The extent size.
* @api stable
*/
ol.extent.getSize = function(extent) {
return [extent[2] - extent[0], extent[3] - extent[1]];
};
/**
* Get the top left coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @return {ol.Coordinate} Top left coordinate.
* @api stable
*/
ol.extent.getTopLeft = function(extent) {
return [extent[0], extent[3]];
};
/**
* Get the top right coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @return {ol.Coordinate} Top right coordinate.
* @api stable
*/
ol.extent.getTopRight = function(extent) {
return [extent[2], extent[3]];
};
/**
* Get the width of an extent.
* @param {ol.Extent} extent Extent.
* @return {number} Width.
* @api stable
*/
ol.extent.getWidth = function(extent) {
return extent[2] - extent[0];
};
/**
* Determine if one extent intersects another.
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent.
* @return {boolean} The two extents intersect.
* @api stable
*/
ol.extent.intersects = function(extent1, extent2) {
return extent1[0] <= extent2[2] &&
extent1[2] >= extent2[0] &&
extent1[1] <= extent2[3] &&
extent1[3] >= extent2[1];
};
/**
* Determine if an extent is empty.
* @param {ol.Extent} extent Extent.
* @return {boolean} Is empty.
* @api stable
*/
ol.extent.isEmpty = function(extent) {
return extent[2] < extent[0] || extent[3] < extent[1];
};
/**
* @param {ol.Extent} extent Extent.
* @param {ol.Extent=} opt_extent Extent.
* @return {ol.Extent} Extent.
*/
ol.extent.returnOrUpdate = function(extent, opt_extent) {
if (opt_extent) {
opt_extent[0] = extent[0];
opt_extent[1] = extent[1];
opt_extent[2] = extent[2];
opt_extent[3] = extent[3];
return opt_extent;
} else {
return extent;
}
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} value Value.
*/
ol.extent.scaleFromCenter = function(extent, value) {
var deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);
var deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);
extent[0] -= deltaX;
extent[2] += deltaX;
extent[1] -= deltaY;
extent[3] += deltaY;
};
/**
* Determine if the segment between two coordinates intersects (crosses,
* touches, or is contained by) the provided extent.
* @param {ol.Extent} extent The extent.
* @param {ol.Coordinate} start Segment start coordinate.
* @param {ol.Coordinate} end Segment end coordinate.
* @return {boolean} The segment intersects the extent.
*/
ol.extent.intersectsSegment = function(extent, start, end) {
var intersects = false;
var startRel = ol.extent.coordinateRelationship(extent, start);
var endRel = ol.extent.coordinateRelationship(extent, end);
if (startRel === ol.extent.Relationship.INTERSECTING ||
endRel === ol.extent.Relationship.INTERSECTING) {
intersects = true;
} else {
var minX = extent[0];
var minY = extent[1];
var maxX = extent[2];
var maxY = extent[3];
var startX = start[0];
var startY = start[1];
var endX = end[0];
var endY = end[1];
var slope = (endY - startY) / (endX - startX);
var x, y;
if (!!(endRel & ol.extent.Relationship.ABOVE) &&
!(startRel & ol.extent.Relationship.ABOVE)) {
// potentially intersects top
x = endX - ((endY - maxY) / slope);
intersects = x >= minX && x <= maxX;
}
if (!intersects && !!(endRel & ol.extent.Relationship.RIGHT) &&
!(startRel & ol.extent.Relationship.RIGHT)) {
// potentially intersects right
y = endY - ((endX - maxX) * slope);
intersects = y >= minY && y <= maxY;
}
if (!intersects && !!(endRel & ol.extent.Relationship.BELOW) &&
!(startRel & ol.extent.Relationship.BELOW)) {
// potentially intersects bottom
x = endX - ((endY - minY) / slope);
intersects = x >= minX && x <= maxX;
}
if (!intersects && !!(endRel & ol.extent.Relationship.LEFT) &&
!(startRel & ol.extent.Relationship.LEFT)) {
// potentially intersects left
y = endY - ((endX - minX) * slope);
intersects = y >= minY && y <= maxY;
}
}
return intersects;
};
/**
* Apply a transform function to the extent.
* @param {ol.Extent} extent Extent.
* @param {ol.TransformFunction} transformFn Transform function. Called with
* [minX, minY, maxX, maxY] extent coordinates.
* @param {ol.Extent=} opt_extent Destination extent.
* @return {ol.Extent} Extent.
* @api stable
*/
ol.extent.applyTransform = function(extent, transformFn, opt_extent) {
var coordinates = [
extent[0], extent[1],
extent[0], extent[3],
extent[2], extent[1],
extent[2], extent[3]
];
transformFn(coordinates, coordinates, 2);
var xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];
var ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];
return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
};