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Add ol.geom.closest

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Tom Payne
2013-12-07 12:42:41 +01:00
parent 5d36c2a55e
commit 74bf8a7ecb
2 changed files with 313 additions and 0 deletions
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194
src/ol/geom/closestgeom.js Normal file
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// FIXME find better names for these functions
goog.provide('ol.geom.closest');
goog.require('goog.asserts');
goog.require('ol.geom.flat');
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {number} maxSquaredDelta Max squared delta.
* @return {number} Max squared delta.
*/
ol.geom.closest.getMaxSquaredDelta =
function(flatCoordinates, offset, end, stride, maxSquaredDelta) {
var x1 = flatCoordinates[offset];
var y1 = flatCoordinates[offset + 1];
for (offset += stride; offset < end; offset += stride) {
var x2 = flatCoordinates[offset];
var y2 = flatCoordinates[offset + 1];
var squaredDelta = ol.geom.flat.squaredDistance(x1, y1, x2, y2);
if (squaredDelta > maxSquaredDelta) {
maxSquaredDelta = squaredDelta;
}
x1 = x2;
y1 = y2;
}
return maxSquaredDelta;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<number>} ends Ends.
* @param {number} stride Stride.
* @param {number} maxSquaredDelta Max squared delta.
* @return {number} Max squared delta.
*/
ol.geom.closest.getsMaxSquaredDelta =
function(flatCoordinates, offset, ends, stride, maxSquaredDelta) {
var i, ii;
for (i = 0, ii = ends.length; i < ii; ++i) {
var end = ends[i];
maxSquaredDelta = ol.geom.closest.getMaxSquaredDelta(
flatCoordinates, offset, end, stride, maxSquaredDelta);
offset = end;
}
return maxSquaredDelta;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<Array.<number>>} endss Endss.
* @param {number} stride Stride.
* @param {number} maxSquaredDelta Max squared delta.
* @return {number} Max squared delta.
*/
ol.geom.closest.getssMaxSquaredDelta =
function(flatCoordinates, offset, endss, stride, maxSquaredDelta) {
var i, ii;
for (i = 0, ii = endss.length; i < ii; ++i) {
var ends = endss[i];
maxSquaredDelta = ol.geom.closest.getsMaxSquaredDelta(
flatCoordinates, offset, ends, stride, maxSquaredDelta);
offset = ends[ends.length - 1];
}
return maxSquaredDelta;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {number} maxDelta Max delta.
* @param {boolean} isRing Is ring.
* @param {number} x X.
* @param {number} y Y.
* @param {Array.<number>} closestPoint Closest point.
* @param {number} minSquaredDistance Minimum squared distance.
* @return {number} Minimum squared distance.
*/
ol.geom.closest.getClosestPoint = function(flatCoordinates, offset, end, stride,
maxDelta, isRing, x, y, closestPoint, minSquaredDistance) {
if (offset == end) {
return minSquaredDistance;
}
var squaredDistance;
if (maxDelta === 0) {
// All points are identical, so just test the first point.
squaredDistance = ol.geom.flat.squaredDistance(
x, y, flatCoordinates[offset], flatCoordinates[offset + 1]);
if (squaredDistance < minSquaredDistance) {
closestPoint[0] = flatCoordinates[offset];
closestPoint[1] = flatCoordinates[offset + 1];
return squaredDistance;
} else {
return minSquaredDistance;
}
}
goog.asserts.assert(maxDelta > 0);
var point = [NaN, NaN];
var index = offset + stride;
while (index < end) {
ol.geom.flat.closestPoint(x, y,
flatCoordinates[index - stride], flatCoordinates[index - stride + 1],
flatCoordinates[index], flatCoordinates[index + 1], point);
squaredDistance = ol.geom.flat.squaredDistance(x, y, point[0], point[1]);
if (squaredDistance < minSquaredDistance) {
minSquaredDistance = squaredDistance;
closestPoint[0] = point[0];
closestPoint[1] = point[1];
index += stride;
} else {
index += stride * Math.max(
((Math.sqrt(squaredDistance) -
Math.sqrt(minSquaredDistance)) / maxDelta) | 0, 1);
}
}
if (isRing) {
// check the closing segment
ol.geom.flat.closestPoint(x, y,
flatCoordinates[end - stride], flatCoordinates[end - stride + 1],
flatCoordinates[offset], flatCoordinates[offset + 1], point);
squaredDistance = ol.geom.flat.squaredDistance(x, y, point[0], point[1]);
if (squaredDistance < minSquaredDistance) {
minSquaredDistance = squaredDistance;
closestPoint[0] = point[0];
closestPoint[1] = point[1];
}
}
return minSquaredDistance;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<number>} ends Ends.
* @param {number} stride Stride.
* @param {number} maxDelta Max delta.
* @param {boolean} isRing Is ring.
* @param {number} x X.
* @param {number} y Y.
* @param {Array.<number>} closestPoint Closest point.
* @param {number} minSquaredDistance Minimum squared distance.
* @return {number} Minimum squared distance.
*/
ol.geom.closest.getsClosestPoint = function(flatCoordinates, offset, ends,
stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance) {
var i, ii;
for (i = 0, ii = ends.length; i < ii; ++i) {
var end = ends[i];
minSquaredDistance = ol.geom.closest.getClosestPoint(
flatCoordinates, offset, end, stride,
maxDelta, isRing, x, y, closestPoint, minSquaredDistance);
offset = end;
}
return minSquaredDistance;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<Array.<number>>} endss Endss.
* @param {number} stride Stride.
* @param {number} maxDelta Max delta.
* @param {boolean} isRing Is ring.
* @param {number} x X.
* @param {number} y Y.
* @param {Array.<number>} closestPoint Closest point.
* @param {number} minSquaredDistance Minimum squared distance.
* @return {number} Minimum squared distance.
*/
ol.geom.closest.getssClosestPoint = function(flatCoordinates, offset, endss,
stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance) {
var i, ii;
for (i = 0, ii = endss.length; i < ii; ++i) {
var ends = endss[i];
minSquaredDistance = ol.geom.closest.getsClosestPoint(
flatCoordinates, offset, ends, stride,
maxDelta, isRing, x, y, closestPoint, minSquaredDistance);
offset = ends[ends.length - 1];
}
return minSquaredDistance;
};

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test/spec/ol/geom/closestgeom.test.js Normal file
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goog.provide('ol.test.geom.closest');
describe('ol.geom.closest', function() {
describe('with simple data', function() {
var flatCoordinates = [0, 0, 1, 0, 3, 0, 5, 0, 6, 0, 8, 0, 11, 0];
describe('ol.geom.closest.getMaxSquaredDelta', function() {
it('returns the expected value in simple cases', function() {
expect(ol.geom.closest.getMaxSquaredDelta(
flatCoordinates, 0, flatCoordinates.length, 2, 0)).to.be(9);
});
});
describe('ol.geom.closest.getClosestPoint', function() {
it('returns the expected value', function() {
var maxDelta = Math.sqrt(ol.geom.closest.getMaxSquaredDelta(
flatCoordinates, 0, flatCoordinates.length, 2, 0));
expect(maxDelta).to.be(3);
var closestPoint = [NaN, NaN];
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 0, 0, closestPoint, Infinity)).to.be(0);
expect(closestPoint).to.eql([0, 0]);
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 4, 1, closestPoint, Infinity)).to.be(1);
expect(closestPoint).to.eql([4, 0]);
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 5, 2, closestPoint, Infinity)).to.be(4);
expect(closestPoint).to.eql([5, 0]);
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 10, 100, closestPoint, Infinity)).to.be(10000);
expect(closestPoint).to.eql([10, 0]);
});
});
});
describe('with real data', function() {
var flatCoordinates = [
224.55, 250.15, 226.91, 244.19, 233.31, 241.45, 234.98, 236.06,
244.21, 232.76, 262.59, 215.31, 267.76, 213.81, 273.57, 201.84,
273.12, 192.16, 277.62, 189.03, 280.36, 181.41, 286.51, 177.74,
292.41, 159.37, 296.91, 155.64, 314.95, 151.37, 319.75, 145.16,
330.33, 137.57, 341.48, 139.96, 369.98, 137.89, 387.39, 142.51,
391.28, 139.39, 409.52, 141.14, 414.82, 139.75, 427.72, 127.30,
439.60, 119.74, 474.93, 107.87, 486.51, 106.75, 489.20, 109.45,
493.79, 108.63, 504.74, 119.66, 512.96, 122.35, 518.63, 120.89,
524.09, 126.88, 529.57, 127.86, 534.21, 140.93, 539.27, 147.24,
567.69, 148.91, 575.25, 157.26, 580.62, 158.15, 601.53, 156.85,
617.74, 159.86, 622.00, 167.04, 629.55, 194.60, 638.90, 195.61,
641.26, 200.81, 651.77, 204.56, 671.55, 222.55, 683.68, 217.45,
695.25, 219.15, 700.64, 217.98, 703.12, 214.36, 712.26, 215.87,
721.49, 212.81, 727.81, 213.36, 729.98, 208.73, 735.32, 208.20,
739.94, 204.77, 769.98, 208.42, 779.60, 216.87, 784.20, 218.16,
800.24, 214.62, 810.53, 219.73, 817.19, 226.82, 820.77, 236.17,
827.23, 236.16, 829.89, 239.89, 851.00, 248.94, 859.88, 255.49,
865.21, 268.53, 857.95, 280.30, 865.48, 291.45, 866.81, 298.66,
864.68, 302.71, 867.79, 306.17, 859.87, 311.37, 860.08, 314.35,
858.29, 314.94, 858.10, 327.60, 854.54, 335.40, 860.92, 343.00,
856.43, 350.15, 851.42, 352.96, 849.84, 359.59, 854.56, 365.53,
849.74, 370.38, 844.09, 371.89, 844.75, 380.44, 841.52, 383.67,
839.57, 390.40, 845.59, 399.05, 848.40, 407.55, 843.71, 411.30,
844.09, 419.88, 839.51, 432.76, 841.33, 441.04, 847.62, 449.22,
847.16, 458.44, 851.38, 462.79, 853.97, 471.15, 866.36, 480.77
];
describe('ol.geom.closet.maSquaredDelta', function() {
it('returns the expected value', function() {
expect(ol.geom.closest.getMaxSquaredDelta(
flatCoordinates, 0, flatCoordinates.length, 2, 0)).
to.roughlyEqual(1389.1058, 1e-9);
});
});
describe('ol.geom.closest.getClosestPoint', function() {
it('returns the expected value', function() {
var maxDelta = Math.sqrt(ol.geom.closest.getMaxSquaredDelta(
flatCoordinates, 0, flatCoordinates.length, 2, 0));
expect(maxDelta).to.roughlyEqual(Math.sqrt(1389.1058), 1e-9);
var closestPoint = [NaN, NaN];
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 0, 0, closestPoint, Infinity)).
to.roughlyEqual(110902.405, 1e-9);
expect(closestPoint).to.eql([292.41, 159.37]);
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 500, 500, closestPoint, Infinity)).
to.roughlyEqual(106407.905, 1e-9);
expect(closestPoint).to.eql([671.55, 222.55]);
expect(ol.geom.closest.getClosestPoint(
flatCoordinates, 0, flatCoordinates.length, 2,
maxDelta, false, 1000, 500, closestPoint, Infinity)).
to.roughlyEqual(18229.4425, 1e-9);
expect(closestPoint).to.eql([866.36, 480.77]);
});
});
});
});
goog.require('ol.geom.closest');