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8×
| goog.provide('ol.geom.flat.interpolate');
goog.require('ol.array');
goog.require('ol.math');
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {number} fraction Fraction.
* @param {Array.<number>=} opt_dest Destination.
* @return {Array.<number>} Destination.
*/
ol.geom.flat.interpolate.lineString = function(flatCoordinates, offset, end, stride, fraction, opt_dest) {
var pointX = NaN;
var pointY = NaN;
var n = (end - offset) / stride;
if (n === 1) {
pointX = flatCoordinates[offset];
pointY = flatCoordinates[offset + 1];
} else if (n == 2) {
pointX = (1 - fraction) * flatCoordinates[offset] +
fraction * flatCoordinates[offset + stride];
pointY = (1 - fraction) * flatCoordinates[offset + 1] +
fraction * flatCoordinates[offset + stride + 1];
} else Eif (n !== 0) {
var x1 = flatCoordinates[offset];
var y1 = flatCoordinates[offset + 1];
var length = 0;
var cumulativeLengths = [0];
var i;
for (i = offset + stride; i < end; i += stride) {
var x2 = flatCoordinates[i];
var y2 = flatCoordinates[i + 1];
length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
cumulativeLengths.push(length);
x1 = x2;
y1 = y2;
}
var target = fraction * length;
var index = ol.array.binarySearch(cumulativeLengths, target);
if (index < 0) {
var t = (target - cumulativeLengths[-index - 2]) /
(cumulativeLengths[-index - 1] - cumulativeLengths[-index - 2]);
var o = offset + (-index - 2) * stride;
pointX = ol.math.lerp(
flatCoordinates[o], flatCoordinates[o + stride], t);
pointY = ol.math.lerp(
flatCoordinates[o + 1], flatCoordinates[o + stride + 1], t);
} else {
pointX = flatCoordinates[offset + index * stride];
pointY = flatCoordinates[offset + index * stride + 1];
}
}
if (opt_dest) {
opt_dest[0] = pointX;
opt_dest[1] = pointY;
return opt_dest;
} else {
return [pointX, pointY];
}
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {number} m M.
* @param {boolean} extrapolate Extrapolate.
* @return {ol.Coordinate} Coordinate.
*/
ol.geom.flat.interpolate.lineStringCoordinateAtM = function(flatCoordinates, offset, end, stride, m, extrapolate) {
Iif (end == offset) {
return null;
}
var coordinate;
if (m < flatCoordinates[offset + stride - 1]) {
if (extrapolate) {
coordinate = flatCoordinates.slice(offset, offset + stride);
coordinate[stride - 1] = m;
return coordinate;
} else {
return null;
}
} else if (flatCoordinates[end - 1] < m) {
if (extrapolate) {
coordinate = flatCoordinates.slice(end - stride, end);
coordinate[stride - 1] = m;
return coordinate;
} else {
return null;
}
}
// FIXME use O(1) search
if (m == flatCoordinates[offset + stride - 1]) {
return flatCoordinates.slice(offset, offset + stride);
}
var lo = offset / stride;
var hi = end / stride;
while (lo < hi) {
var mid = (lo + hi) >> 1;
if (m < flatCoordinates[(mid + 1) * stride - 1]) {
hi = mid;
} else {
lo = mid + 1;
}
}
var m0 = flatCoordinates[lo * stride - 1];
if (m == m0) {
return flatCoordinates.slice((lo - 1) * stride, (lo - 1) * stride + stride);
}
var m1 = flatCoordinates[(lo + 1) * stride - 1];
var t = (m - m0) / (m1 - m0);
coordinate = [];
var i;
for (i = 0; i < stride - 1; ++i) {
coordinate.push(ol.math.lerp(flatCoordinates[(lo - 1) * stride + i],
flatCoordinates[lo * stride + i], t));
}
coordinate.push(m);
return coordinate;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<number>} ends Ends.
* @param {number} stride Stride.
* @param {number} m M.
* @param {boolean} extrapolate Extrapolate.
* @param {boolean} interpolate Interpolate.
* @return {ol.Coordinate} Coordinate.
*/
ol.geom.flat.interpolate.lineStringsCoordinateAtM = function(
flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {
if (interpolate) {
return ol.geom.flat.interpolate.lineStringCoordinateAtM(
flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);
}
var coordinate;
if (m < flatCoordinates[stride - 1]) {
if (extrapolate) {
coordinate = flatCoordinates.slice(0, stride);
coordinate[stride - 1] = m;
return coordinate;
} else {
return null;
}
}
if (flatCoordinates[flatCoordinates.length - 1] < m) {
if (extrapolate) {
coordinate = flatCoordinates.slice(flatCoordinates.length - stride);
coordinate[stride - 1] = m;
return coordinate;
} else {
return null;
}
}
var i, ii;
for (i = 0, ii = ends.length; i < ii; ++i) {
var end = ends[i];
Iif (offset == end) {
continue;
}
if (m < flatCoordinates[offset + stride - 1]) {
return null;
} else if (m <= flatCoordinates[end - 1]) {
return ol.geom.flat.interpolate.lineStringCoordinateAtM(
flatCoordinates, offset, end, stride, m, false);
}
offset = end;
}
return null;
};
|