add immoweb ui

immoweb/node_modules/@turf/hex-grid/index.js

@@ -0,0 +1,130 @@
+var point = require('@turf/helpers').point;
+var polygon = require('@turf/helpers').polygon;
+var distance = require('@turf/distance');
+var featurecollection = require('@turf/helpers').featureCollection;
+
+//Precompute cosines and sines of angles used in hexagon creation
+// for performance gain
+var cosines = [];
+var sines = [];
+for (var i = 0; i < 6; i++) {
+    var angle = 2 * Math.PI / 6 * i;
+    cosines.push(Math.cos(angle));
+    sines.push(Math.sin(angle));
+}
+
+/**
+ * Takes a bounding box and a cell size in degrees and returns a {@link FeatureCollection} of flat-topped
+ * hexagons ({@link Polygon} features) aligned in an "odd-q" vertical grid as
+ * described in [Hexagonal Grids](http://www.redblobgames.com/grids/hexagons/).
+ *
+ * @name hexGrid
+ * @param {Array<number>} bbox extent in [minX, minY, maxX, maxY] order
+ * @param {number} cellSize dimension of cell in specified units
+ * @param {string} [units=kilometers] used in calculating cellSize, can be degrees, radians, miles, or kilometers
+ * @param {boolean} [triangles=false] whether to return as triangles instead of hexagons
+ * @returns {FeatureCollection<Polygon>} a hexagonal grid
+ * @example
+ * var bbox = [-96,31,-84,40];
+ * var cellSize = 50;
+ * var units = 'miles';
+ *
+ * var hexgrid = turf.hexGrid(bbox, cellSize, units);
+ *
+ * //=hexgrid
+ */
+module.exports = function hexGrid(bbox, cellSize, units, triangles) {
+    var xFraction = cellSize / (distance(point([bbox[0], bbox[1]]), point([bbox[2], bbox[1]]), units));
+    var cellWidth = xFraction * (bbox[2] - bbox[0]);
+    var yFraction = cellSize / (distance(point([bbox[0], bbox[1]]), point([bbox[0], bbox[3]]), units));
+    var cellHeight = yFraction * (bbox[3] - bbox[1]);
+    var radius = cellWidth / 2;
+
+    var hex_width = radius * 2;
+    var hex_height = Math.sqrt(3) / 2 * cellHeight;
+
+    var box_width = bbox[2] - bbox[0];
+    var box_height = bbox[3] - bbox[1];
+
+    var x_interval = 3 / 4 * hex_width;
+    var y_interval = hex_height;
+
+    var x_span = box_width / (hex_width - radius / 2);
+    var x_count = Math.ceil(x_span);
+    if (Math.round(x_span) === x_count) {
+        x_count++;
+    }
+
+    var x_adjust = ((x_count * x_interval - radius / 2) - box_width) / 2 - radius / 2;
+
+    var y_count = Math.ceil(box_height / hex_height);
+
+    var y_adjust = (box_height - y_count * hex_height) / 2;
+
+    var hasOffsetY = y_count * hex_height - box_height > hex_height / 2;
+    if (hasOffsetY) {
+        y_adjust -= hex_height / 4;
+    }
+
+    var fc = featurecollection([]);
+    for (var x = 0; x < x_count; x++) {
+        for (var y = 0; y <= y_count; y++) {
+
+            var isOdd = x % 2 === 1;
+            if (y === 0 && isOdd) {
+                continue;
+            }
+
+            if (y === 0 && hasOffsetY) {
+                continue;
+            }
+
+            var center_x = x * x_interval + bbox[0] - x_adjust;
+            var center_y = y * y_interval + bbox[1] + y_adjust;
+
+            if (isOdd) {
+                center_y -= hex_height / 2;
+            }
+            if (triangles) {
+                fc.features.push.apply(fc.features, hexTriangles([center_x, center_y], cellWidth / 2, cellHeight / 2));
+            } else {
+                fc.features.push(hexagon([center_x, center_y], cellWidth / 2, cellHeight / 2));
+            }
+        }
+    }
+
+    return fc;
+};
+
+//Center should be [x, y]
+function hexagon(center, rx, ry) {
+    var vertices = [];
+    for (var i = 0; i < 6; i++) {
+        var x = center[0] + rx * cosines[i];
+        var y = center[1] + ry * sines[i];
+        vertices.push([x, y]);
+    }
+    //first and last vertex must be the same
+    vertices.push(vertices[0]);
+    return polygon([vertices]);
+}
+
+//Center should be [x, y]
+function hexTriangles(center, rx, ry) {
+    var triangles = [];
+    for (var i = 0; i < 6; i++) {
+        var vertices = [];
+        vertices.push(center);
+        vertices.push([
+            center[0] + rx * cosines[i],
+            center[1] + ry * sines[i]
+        ]);
+        vertices.push([
+            center[0] + rx * cosines[(i + 1) % 6],
+            center[1] + ry * sines[(i + 1) % 6]
+        ]);
+        vertices.push(center);
+        triangles.push(polygon([vertices]));
+    }
+    return triangles;
+}