File size: 3,534 Bytes
4b876a7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | goog.provide('ol.geom.flat.contains');
goog.require('ol.extent');
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {ol.Extent} extent Extent.
* @return {boolean} Contains extent.
*/
ol.geom.flat.contains.linearRingContainsExtent = function(flatCoordinates, offset, end, stride, extent) {
var outside = ol.extent.forEachCorner(extent,
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @return {boolean} Contains (x, y).
*/
function(coordinate) {
return !ol.geom.flat.contains.linearRingContainsXY(flatCoordinates,
offset, end, stride, coordinate[0], coordinate[1]);
});
return !outside;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {number} x X.
* @param {number} y Y.
* @return {boolean} Contains (x, y).
*/
ol.geom.flat.contains.linearRingContainsXY = function(flatCoordinates, offset, end, stride, x, y) {
// http://geomalgorithms.com/a03-_inclusion.html
// Copyright 2000 softSurfer, 2012 Dan Sunday
// This code may be freely used and modified for any purpose
// providing that this copyright notice is included with it.
// SoftSurfer makes no warranty for this code, and cannot be held
// liable for any real or imagined damage resulting from its use.
// Users of this code must verify correctness for their application.
var wn = 0;
var x1 = flatCoordinates[end - stride];
var y1 = flatCoordinates[end - stride + 1];
for (; offset < end; offset += stride) {
var x2 = flatCoordinates[offset];
var y2 = flatCoordinates[offset + 1];
if (y1 <= y) {
if (y2 > y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) > 0) {
wn++;
}
} else if (y2 <= y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) < 0) {
wn--;
}
x1 = x2;
y1 = y2;
}
return wn !== 0;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<number>} ends Ends.
* @param {number} stride Stride.
* @param {number} x X.
* @param {number} y Y.
* @return {boolean} Contains (x, y).
*/
ol.geom.flat.contains.linearRingsContainsXY = function(flatCoordinates, offset, ends, stride, x, y) {
if (ends.length === 0) {
return false;
}
if (!ol.geom.flat.contains.linearRingContainsXY(
flatCoordinates, offset, ends[0], stride, x, y)) {
return false;
}
var i, ii;
for (i = 1, ii = ends.length; i < ii; ++i) {
if (ol.geom.flat.contains.linearRingContainsXY(
flatCoordinates, ends[i - 1], ends[i], stride, x, y)) {
return false;
}
}
return true;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {Array.<Array.<number>>} endss Endss.
* @param {number} stride Stride.
* @param {number} x X.
* @param {number} y Y.
* @return {boolean} Contains (x, y).
*/
ol.geom.flat.contains.linearRingssContainsXY = function(flatCoordinates, offset, endss, stride, x, y) {
if (endss.length === 0) {
return false;
}
var i, ii;
for (i = 0, ii = endss.length; i < ii; ++i) {
var ends = endss[i];
if (ol.geom.flat.contains.linearRingsContainsXY(
flatCoordinates, offset, ends, stride, x, y)) {
return true;
}
offset = ends[ends.length - 1];
}
return false;
};
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