mirror of
https://github.com/jiawanlong/Cesium-Examples.git
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898 lines
26 KiB
JavaScript
898 lines
26 KiB
JavaScript
export const currentData = {
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TRANSPARENT_BLACK: [0, 0, 0, 0],
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HOLE_VECTOR: [NaN, NaN, null],
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NULL_WIND_VECTOR: [NaN, NaN, null],
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SECOND: 1000,
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MINUTE: 60 * 1000,
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HOUR: 60 * 60 * 1000,
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MAX_TASK_TIME: 10,
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RTOD: 57.29578049044297,
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T: 2 * Math.PI,
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H: 0.000036, // 0.0000360°lat_p ~: 4m
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OVERLAY_ALPHA: Math.floor(0.4 * 255),
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MIN_SLEEP_TIME: 2,
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//每帧调用
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INTENSITY_SCALE_STEP: 5,
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maxIntensity: 17,
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PARTICLE_MULTIPLIER: 1 / 300,
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INTERPOLATEDIV: 2,
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velocityScale_o: 0.000016666666666666667 * 0.03,
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MAX_PARTICLE_AGE: 90,
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fadeFillStyle: 'rgba(0, 0, 0, 0.95)',
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PARTICLE_LINEWIDTH: 1,
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WindScale: 1.0 * 600,
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BOUNDARY: 0.45,
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fadeToWhite: colorInterpolator(sinebowColor(1.0, 0), [255, 255, 255]),
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floorMod: function (a, n) {
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var f = a - n * Math.floor(a / n)
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// HACK: when a is extremely close to an n transition, f can be equal to n. This is bad because f must be
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// within range [0, n). Check for this corner case. Example: a:=-1e-16, n:=10. What is the proper fix?
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return f === n ? 0 : f
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},
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isValue: function (x) {
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return x !== null && x !== undefined
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},
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bilinearInterpolateVector: function (x, y, g00, g10, g01, g11) {
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var rx = 1 - x
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var ry = 1 - y
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var a = rx * ry,
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b = x * ry,
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c = rx * y,
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d = x * y
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var u = g00[0] * a + g10[0] * b + g01[0] * c + g11[0] * d
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var v = g00[1] * a + g10[1] * b + g01[1] * c + g11[1] * d
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return [u, v, Math.sqrt(u * u + v * v)]
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},
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buildGrid: function (builder) {
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var header = builder.header
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var lng1 = header.lo1,
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lat1 = header.la1 // the grid's origin (e.g., 0.0E, 90.0N)
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var dx1 = header.dx,
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dy1 = header.dy // distance between grid points (e.g., 2.5 deg lon, 2.5 deg lat)
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var ni = header.nx,
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nj = header.ny // number of grid points W-E and N-S (e.g., 144 x 73)
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// var date = new Date(header.refTime);
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// date.setHours(date.getHours() + header.forecastTime);
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// Scan mode 0 assumed. Longitude increases from lng1, and latitude decreases from lat1.
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// http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table3-4.shtml
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var grid = [],
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p = 0
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var isContinuous = Math.floor(ni * dx1) >= 360
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for (var j = 0; j < nj; j++) {
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var row = []
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for (var i = 0; i < ni; i++, p++) {
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row[i] = builder.data(p)
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}
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if (isContinuous) {
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// For wrapped grids, duplicate first column as last column to simplify interpolation logic
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row.push(row[0])
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}
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grid[j] = row
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}
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this.interpolate = function (lng_p, lat_p) {
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var i = currentData.floorMod(lng_p - lng1, 360) / dx1 // calculate longitude index in wrapped range [0, 360)
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var j = (lat1 - lat_p) / dy1 // calculate latitude index in direction +90 to -90
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// 1 2 After converting lng_p and lat_p to fractional grid indexes i and j, we find the
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// fi i ci four points "G" that enclose point (i, j). These points are at the four
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// | =1.4 | corners specified by the floor and ceiling of i and j. For example, given
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// ---G--|---G--- fj 8 i = 1.4 and j = 8.3, the four surrounding grid points are (1, 8), (2, 8),
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// j ___|_ . | (1, 9) and (2, 9).
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// =8.3 | |
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// ---G------G--- cj 9 Note that for wrapped grids, the first column is duplicated as the last
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// | | column, so the index ci can be used without taking a modulo.
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var fi = Math.floor(i),
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ci = fi + 1
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var fj = Math.floor(j),
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cj = fj + 1
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var row
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if ((row = grid[fj])) {
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var g00 = row[fi]
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var g10 = row[ci]
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if (
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currentData.isValue(g00) &&
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currentData.isValue(g10) &&
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(row = grid[cj])
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) {
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var g01 = row[fi]
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var g11 = row[ci]
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if (currentData.isValue(g01) && currentData.isValue(g11)) {
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// All four points found, so interpolate the value.
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return builder.interpolate(i - fi, j - fj, g00, g10, g01, g11)
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}
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}
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}
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// console.log("cannot interpolate: " + lng_p + "," + lat_p + ": " + fi + " " + ci + " " + fj + " " + cj);
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return null
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}
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},
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multiplyComponents: function (v1, v2) {
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return { x: v1.x * v2.x, y: v1.y * v2.y, z: v1.z * v2.z }
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},
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magnitudeSquared: function (v) {
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return v.x * v.x + v.y * v.y + v.z * v.z
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},
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dot: function (v1, v2) {
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return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
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},
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multiplyByScalar: function (v, s) {
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return { x: v.x * s, y: v.y * s, z: v.z * s }
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},
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magnitude: function (v) {
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return Math.sqrt(this.magnitudeSquared(v))
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},
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normalize: function (cartesian) {
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var result = {}
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var magnitude = this.magnitude(cartesian)
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result.x = cartesian.x / magnitude
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result.y = cartesian.y / magnitude
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result.z = cartesian.z / magnitude
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if (isNaN(result.x) || isNaN(result.y) || isNaN(result.z)) {
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throw new DeveloperError('normalized result is not a number')
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}
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return result
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},
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subtract: function (left, right) {
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var result = {}
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result.x = left.x - right.x
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result.y = left.y - right.y
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result.z = left.z - right.z
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return result
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},
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add: function (left, right) {
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var result = {}
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result.x = left.x + right.x
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result.y = left.y + right.y
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result.z = left.z + right.z
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return result
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},
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divideByScalar: function (cartesian, scalar) {
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var result = {}
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result.x = cartesian.x / scalar
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result.y = cartesian.y / scalar
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result.z = cartesian.z / scalar
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return result
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},
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sign: function (value) {
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value = +value // coerce to number
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if (value === 0 || value !== value) {
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return value
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}
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return value > 0 ? 1 : -1
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},
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toRadians: function (degrees) {
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return (degrees * Math.PI) / 180.0
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},
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rayEllipsoid: function (ray) {
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var inverseRadii = {
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x: 1.567855942887398e-7,
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y: 1.567855942887398e-7,
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z: 1.573130351105623e-7
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}
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var q = this.multiplyComponents(inverseRadii, ray.origin)
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var w = this.multiplyComponents(inverseRadii, ray.direction)
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var q2 = this.magnitudeSquared(q)
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var qw = this.dot(q, w)
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var difference, w2, product, discriminant, temp
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if (q2 > 1.0) {
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// Outside ellipsoid.
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if (qw >= 0.0) {
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// Looking outward or tangent (0 intersections).
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return undefined
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}
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// qw < 0.0.
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var qw2 = qw * qw
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difference = q2 - 1.0 // Positively valued.
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w2 = this.magnitudeSquared(w)
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product = w2 * difference
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if (qw2 < product) {
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// Imaginary roots (0 intersections).
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return undefined
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} else if (qw2 > product) {
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// Distinct roots (2 intersections).
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discriminant = qw * qw - product
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temp = -qw + Math.sqrt(discriminant) // Avoid cancellation.
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var root0 = temp / w2
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var root1 = difference / temp
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if (root0 < root1) {
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return { start: root0, stop: root1 }
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}
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return { start: root1, stop: root0 }
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}
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// qw2 == product. Repeated roots (2 intersections).
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var root = Math.sqrt(difference / w2)
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return { start: root, stop: root }
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} else if (q2 < 1.0) {
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// Inside ellipsoid (2 intersections).
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difference = q2 - 1.0 // Negatively valued.
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w2 = this.magnitudeSquared(w)
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product = w2 * difference // Negatively valued.
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discriminant = qw * qw - product
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temp = -qw + Math.sqrt(discriminant) // Positively valued.
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return { start: 0.0, stop: temp / w2 }
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}
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// q2 == 1.0. On ellipsoid.
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if (qw < 0.0) {
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// Looking inward.
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w2 = this.magnitudeSquared(w)
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return { start: 0.0, stop: -qw / w2 }
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}
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// qw >= 0.0. Looking outward or tangent.
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return undefined
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},
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getPickRay: function (
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width,
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height,
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fovy,
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aspectRatio,
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near,
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position,
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directionWC,
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rightWC,
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upWC,
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windowPosition
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) {
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var tanPhi = Math.tan(fovy * 0.5)
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var tanTheta = aspectRatio * tanPhi
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var x = (2.0 / width) * windowPosition.x - 1.0
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var y = (2.0 / height) * (height - windowPosition.y) - 1.0
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var nearCenter = this.multiplyByScalar(directionWC, near)
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nearCenter = this.add(position, nearCenter)
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var xDir = this.multiplyByScalar(rightWC, x * near * tanTheta)
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var yDir = this.multiplyByScalar(upWC, y * near * tanPhi)
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// var xDir = this.multiplyByScalar(rightWC, x * near);
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// var yDir = this.multiplyByScalar(upWC, y * near);
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var direction = this.add(nearCenter, xDir)
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direction = this.add(direction, yDir)
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direction = this.subtract(direction, position)
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direction = this.normalize(direction)
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var result = {}
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result.origin = position
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result.direction = direction
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return result
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},
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pickEllipsoid: function (params, windowPosition) {
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var ray = this.getPickRay(
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params.clientWidth,
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params.clientHeight,
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params.fovy,
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params.aspectRatio,
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params.near,
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params.positionWC,
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params.directionWC,
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params.rightWC,
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params.upWC,
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windowPosition
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)
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var intersection = this.rayEllipsoid(ray)
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if (!intersection) {
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return null
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}
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var t = intersection.start > 0.0 ? intersection.start : intersection.stop
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var result = this.multiplyByScalar(ray.direction, t)
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return this.add(ray.origin, result)
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},
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scaleToGeodeticSurface: function (cartesian) {
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var positionX = cartesian.x
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var positionY = cartesian.y
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var positionZ = cartesian.z
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var oneOverRadiiX = 1.567855942887398e-7
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var oneOverRadiiY = 1.567855942887398e-7
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var oneOverRadiiZ = 1.573130351105623e-7
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var x2 = positionX * positionX * oneOverRadiiX * oneOverRadiiX
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var y2 = positionY * positionY * oneOverRadiiY * oneOverRadiiY
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var z2 = positionZ * positionZ * oneOverRadiiZ * oneOverRadiiZ
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// Compute the squared ellipsoid norm.
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var squaredNorm = x2 + y2 + z2
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var ratio = Math.sqrt(1.0 / squaredNorm)
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// As an initial approximation, assume that the radial intersection is the projection point.
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var intersection = this.multiplyByScalar(cartesian, ratio)
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// If the position is near the center, the iteration will not converge.
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var centerToleranceSquared = 0.1
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if (squaredNorm < centerToleranceSquared) {
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return !isFinite(ratio) ? undefined : intersection
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}
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var oneOverRadiiSquaredX = 2.458172257647332e-14
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var oneOverRadiiSquaredY = 2.458172257647332e-14
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var oneOverRadiiSquaredZ = 2.4747391015697002e-14
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// Use the gradient at the intersection point in place of the true unit normal.
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// The difference in magnitude will be absorbed in the multiplier.
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var gradient = {}
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gradient.x = intersection.x * oneOverRadiiSquaredX * 2.0
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gradient.y = intersection.y * oneOverRadiiSquaredY * 2.0
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gradient.z = intersection.z * oneOverRadiiSquaredZ * 2.0
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// Compute the initial guess at the normal vector multiplier, lambda.
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var lambda =
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((1.0 - ratio) * this.magnitude(cartesian)) /
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(0.5 * this.magnitude(gradient))
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var correction = 0.0
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var func
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var denominator
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var xMultiplier
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var yMultiplier
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var zMultiplier
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var xMultiplier2
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var yMultiplier2
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var zMultiplier2
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var xMultiplier3
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var yMultiplier3
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var zMultiplier3
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do {
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lambda -= correction
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xMultiplier = 1.0 / (1.0 + lambda * oneOverRadiiSquaredX)
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yMultiplier = 1.0 / (1.0 + lambda * oneOverRadiiSquaredY)
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zMultiplier = 1.0 / (1.0 + lambda * oneOverRadiiSquaredZ)
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xMultiplier2 = xMultiplier * xMultiplier
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yMultiplier2 = yMultiplier * yMultiplier
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zMultiplier2 = zMultiplier * zMultiplier
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xMultiplier3 = xMultiplier2 * xMultiplier
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yMultiplier3 = yMultiplier2 * yMultiplier
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zMultiplier3 = zMultiplier2 * zMultiplier
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func = x2 * xMultiplier2 + y2 * yMultiplier2 + z2 * zMultiplier2 - 1.0
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// "denominator" here refers to the use of this expression in the velocity and acceleration
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// computations in the sections to follow.
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denominator =
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x2 * xMultiplier3 * oneOverRadiiSquaredX +
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y2 * yMultiplier3 * oneOverRadiiSquaredY +
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z2 * zMultiplier3 * oneOverRadiiSquaredZ
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var derivative = -2.0 * denominator
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correction = func / derivative
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} while (Math.abs(func) > 0.000000000001)
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var result = {}
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result.x = positionX * xMultiplier
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result.y = positionY * yMultiplier
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result.z = positionZ * zMultiplier
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return result
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},
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geodeticSurfaceNormal: function (v) {
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var oneOverRadiiSquared = {
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x: 2.458172257647332e-14,
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y: 2.458172257647332e-14,
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z: 2.4747391015697002e-14
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}
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var result = this.multiplyComponents(v, oneOverRadiiSquared)
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return this.normalize(result)
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},
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cartesianToCartographic: function (cartesian) {
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var p = this.scaleToGeodeticSurface(cartesian)
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if (p == null) {
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return undefined
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}
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var n = this.geodeticSurfaceNormal(p)
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var h = this.subtract(cartesian, p)
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var longitude = Math.atan2(n.y, n.x)
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var latitude = Math.asin(n.z)
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var height = this.sign(this.dot(h, cartesian)) * this.magnitude(h)
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var result = {}
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result.longitude = longitude
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result.latitude = latitude
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result.height = height
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return result
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},
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//屏幕坐标转经纬度,返回值为角度
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ScreenToLonlat: function (params, pos) {
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var resultRay = this.pickEllipsoid(params, pos)
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if (resultRay == undefined) {
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return null
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} else {
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var cartographic = this.cartesianToCartographic(resultRay)
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cartographic.longitude *= currentData.RTOD
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cartographic.latitude *= currentData.RTOD
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return cartographic
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}
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},
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createField: function (columns, bounds, mask) {
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/**
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* @returns {Array} wind vector [u, v, magnitude] at the point (x, y), or [NaN, NaN, null] if wind
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* is undefined at that point.
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*/
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function field(x, y) {
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var column = columns[Math.round(x)]
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return (column && column[Math.round(y)]) || currentData.NULL_WIND_VECTOR
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}
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/**
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* @returns {boolean} true if the field is valid at the point (x, y)
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*/
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field.isDefined = function (x, y) {
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return field(x, y)[2] !== null
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}
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/**
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* @returns {boolean} true if the point (x, y) lies inside the outer boundary of the vector field, even if
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* the vector field has a hole (is undefined) at that point, such as at an island in a field of
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* ocean currents.
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*/
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field.isInsideBoundary = function (x, y) {
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return field(x, y) !== currentData.NULL_WIND_VECTOR
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}
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// Frees the massive "columns" array for GC. Without this, the array is leaked (in Chrome) each time a new
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// field is interpolated because the field closure's context is leaked, for reasons that defy explanation.
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field.release = function () {
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columns = []
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}
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field.randomize = function (o) {
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// UNDONE: this method is terrible
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var x, y
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var safetyNet = 0
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do {
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x = Math.round(currentData.random(bounds.x, bounds.xMax))
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y = Math.round(currentData.random(bounds.y, bounds.yMax))
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|
} while (!field.isDefined(x, y) && safetyNet++ < 30)
|
|
o.x = x
|
|
o.y = y
|
|
return o
|
|
}
|
|
|
|
return field
|
|
},
|
|
|
|
/**
|
|
* Interpolates a sinebow color where 0 <= i <= j, then fades to white where j < i <= 1.
|
|
*
|
|
* @param i number in the range [0, 1]
|
|
* @param a alpha value in range [0, 255]
|
|
* @returns {Array} [r, g, b, a]
|
|
*/
|
|
extendedSinebowColor: function (i, a) {
|
|
return i <= currentData.BOUNDARY
|
|
? sinebowColor((i / currentData.BOUNDARY) * 2, a)
|
|
: currentData.fadeToWhite(
|
|
(i - currentData.BOUNDARY) / (1 - currentData.BOUNDARY),
|
|
a
|
|
)
|
|
},
|
|
|
|
geodeticSurfaceNormalCartographic: function (cartographic) {
|
|
var longitude = cartographic.longitude
|
|
var latitude = cartographic.latitude
|
|
var cosLatitude = Math.cos(latitude)
|
|
|
|
var x = cosLatitude * Math.cos(longitude)
|
|
var y = cosLatitude * Math.sin(longitude)
|
|
var z = Math.sin(latitude)
|
|
|
|
var result = {}
|
|
result.x = x
|
|
result.y = y
|
|
result.z = z
|
|
return this.normalize(result)
|
|
},
|
|
|
|
cartographicToCartesian: function (cartographic) {
|
|
var radiiSquared = {
|
|
x: 40680631590769,
|
|
y: 40680631590769,
|
|
z: 40408299984661.445
|
|
}
|
|
var n = this.geodeticSurfaceNormalCartographic(cartographic)
|
|
var k = this.multiplyComponents(radiiSquared, n)
|
|
var gamma = Math.sqrt(this.dot(n, k))
|
|
k = this.divideByScalar(k, gamma)
|
|
n = this.multiplyByScalar(n, cartographic.height)
|
|
return this.add(k, n)
|
|
},
|
|
|
|
multiplyByVector: function (matrix, cartesian) {
|
|
var vX = cartesian.x
|
|
var vY = cartesian.y
|
|
var vZ = cartesian.z
|
|
var vW = cartesian.w
|
|
|
|
var x = matrix[0] * vX + matrix[4] * vY + matrix[8] * vZ + matrix[12] * vW
|
|
var y = matrix[1] * vX + matrix[5] * vY + matrix[9] * vZ + matrix[13] * vW
|
|
var z = matrix[2] * vX + matrix[6] * vY + matrix[10] * vZ + matrix[14] * vW
|
|
var w = matrix[3] * vX + matrix[7] * vY + matrix[11] * vZ + matrix[15] * vW
|
|
|
|
var result = {}
|
|
result.x = x
|
|
result.y = y
|
|
result.z = z
|
|
result.w = w
|
|
return result
|
|
},
|
|
|
|
multiplyByPoint: function (matrix, cartesian) {
|
|
var vX = cartesian.x
|
|
var vY = cartesian.y
|
|
var vZ = cartesian.z
|
|
|
|
var x = matrix[0] * vX + matrix[4] * vY + matrix[8] * vZ + matrix[12]
|
|
var y = matrix[1] * vX + matrix[5] * vY + matrix[9] * vZ + matrix[13]
|
|
var z = matrix[2] * vX + matrix[6] * vY + matrix[10] * vZ + matrix[14]
|
|
|
|
var result = {}
|
|
result.x = x
|
|
result.y = y
|
|
result.z = z
|
|
return result
|
|
},
|
|
|
|
computeViewportTransformation: function (
|
|
viewport,
|
|
nearDepthRange,
|
|
farDepthRange
|
|
) {
|
|
var x = viewport.x
|
|
var y = viewport.y
|
|
var width = viewport.width
|
|
var height = viewport.height
|
|
|
|
var halfWidth = width * 0.5
|
|
var halfHeight = height * 0.5
|
|
var halfDepth = (farDepthRange - nearDepthRange) * 0.5
|
|
|
|
var column0Row0 = halfWidth
|
|
var column1Row1 = halfHeight
|
|
var column2Row2 = halfDepth
|
|
var column3Row0 = x + halfWidth
|
|
var column3Row1 = y + halfHeight
|
|
var column3Row2 = nearDepthRange + halfDepth
|
|
var column3Row3 = 1.0
|
|
|
|
var result = {}
|
|
result[0] = column0Row0
|
|
result[1] = 0.0
|
|
result[2] = 0.0
|
|
result[3] = 0.0
|
|
result[4] = 0.0
|
|
result[5] = column1Row1
|
|
result[6] = 0.0
|
|
result[7] = 0.0
|
|
result[8] = 0.0
|
|
result[9] = 0.0
|
|
result[10] = column2Row2
|
|
result[11] = 0.0
|
|
result[12] = column3Row0
|
|
result[13] = column3Row1
|
|
result[14] = column3Row2
|
|
result[15] = column3Row3
|
|
return result
|
|
},
|
|
|
|
worldToClip: function (position, eyeOffset, viewMatrix, projectionMatrix) {
|
|
var positionEC = this.multiplyByVector(viewMatrix, {
|
|
x: position.x,
|
|
y: position.y,
|
|
z: position.z,
|
|
w: 1
|
|
})
|
|
|
|
var zEyeOffset = this.multiplyComponents(
|
|
eyeOffset,
|
|
this.normalize(positionEC)
|
|
)
|
|
positionEC.x += eyeOffset.x + zEyeOffset.x
|
|
positionEC.y += eyeOffset.y + zEyeOffset.y
|
|
positionEC.z += zEyeOffset.z
|
|
|
|
return this.multiplyByVector(projectionMatrix, positionEC)
|
|
},
|
|
|
|
clipToGLWindowCoordinates: function (viewport, position) {
|
|
// Perspective divide to transform from clip coordinates to normalized device coordinates
|
|
var positionNDC = this.divideByScalar(position, position.w)
|
|
|
|
// Viewport transform to transform from clip coordinates to window coordinates
|
|
var viewportTransform = this.computeViewportTransformation(
|
|
viewport,
|
|
0.0,
|
|
1.0
|
|
)
|
|
var positionWC = this.multiplyByPoint(viewportTransform, positionNDC)
|
|
|
|
return { x: positionWC.x, y: positionWC.y }
|
|
},
|
|
|
|
wgs84ToWindowCoordinates: function (
|
|
x,
|
|
y,
|
|
width,
|
|
height,
|
|
viewMatrix,
|
|
projectionMatrix,
|
|
position,
|
|
eyeOffset
|
|
) {
|
|
var viewport = {}
|
|
viewport.x = x
|
|
viewport.y = y
|
|
viewport.width = width
|
|
viewport.height = height
|
|
|
|
// View-projection matrix to transform from world coordinates to clip coordinates
|
|
var positionCC = this.worldToClip(
|
|
position,
|
|
eyeOffset,
|
|
viewMatrix,
|
|
projectionMatrix
|
|
)
|
|
if (positionCC.z < 0) {
|
|
return undefined
|
|
}
|
|
|
|
var result = this.clipToGLWindowCoordinates(viewport, positionCC)
|
|
result.y = height - result.y
|
|
return result
|
|
},
|
|
|
|
//屏幕坐标转经纬度,返回值为角度
|
|
LonlatToScreen: function (params, pos) {
|
|
var position = {
|
|
longitude: this.toRadians(pos[0]),
|
|
latitude: this.toRadians(pos[1]),
|
|
height: 0.0
|
|
}
|
|
var cartesianPosition = this.cartographicToCartesian(position)
|
|
var posEnd = this.wgs84ToWindowCoordinates(
|
|
0,
|
|
0,
|
|
params.clientWidth,
|
|
params.clientHeight,
|
|
params.viewMatrix,
|
|
params.projectionMatrix,
|
|
cartesianPosition,
|
|
{ x: 0, y: 0, z: 0 }
|
|
)
|
|
return posEnd
|
|
},
|
|
|
|
distortion: function (params, lng_p, lat_p, x, y) {
|
|
var hlng = lng_p < 0 ? currentData.H : -currentData.H
|
|
var hlat = lat_p < 0 ? currentData.H : -currentData.H
|
|
var plng = currentData.LonlatToScreen(params, [lng_p + hlng, lat_p])
|
|
var plat = currentData.LonlatToScreen(params, [lng_p, lat_p + hlat])
|
|
|
|
// Meridian scale factor (see Snyder, equation 4-3), where R = 1. This handles issue where length of 1° lng_p
|
|
// changes depending on lat_p. Without this, there is a pinching effect at the poles.
|
|
var k = Math.cos((lat_p / 360) * currentData.T)
|
|
|
|
return [
|
|
(plng.x - x) / hlng / k,
|
|
(plng.y - y) / hlng / k,
|
|
(plat.x - x) / hlat,
|
|
(plat.y - y) / hlat
|
|
]
|
|
},
|
|
|
|
distort: function (params, lng_p, lat_p, x, y, scale, wind) {
|
|
var u = wind[0] * scale
|
|
var v = wind[1] * scale
|
|
var d = currentData.distortion(params, lng_p, lat_p, x, y)
|
|
|
|
// Scale currentData.distortion vectors by u and v, then add.
|
|
wind[0] = d[0] * u + d[2] * v
|
|
wind[1] = d[1] * u + d[3] * v
|
|
return wind
|
|
},
|
|
|
|
asColorStyle: function (r, g, b, a) {
|
|
return 'rgba(' + r + ', ' + g + ', ' + b + ', ' + a + ')'
|
|
},
|
|
|
|
windIntensityColorScale: function (step, maxWind) {
|
|
var result = []
|
|
for (var j = 85; j <= 255; j += step) {
|
|
result.push(currentData.asColorStyle(255, 255, 255, 255.0))
|
|
}
|
|
result.indexFor = function (m) {
|
|
// map wind speed to a style
|
|
return Math.floor((Math.min(m, maxWind) / maxWind) * (result.length - 1))
|
|
}
|
|
return result
|
|
},
|
|
|
|
random: function (min, max) {
|
|
if (max == null) {
|
|
max = min
|
|
min = 0
|
|
}
|
|
return min + Math.floor(Math.random() * (max - min + 1))
|
|
},
|
|
|
|
CreateMask: function (width, height, offscreen) {
|
|
var canvas = null
|
|
if (offscreen) {
|
|
canvas = new OffscreenCanvas(width, height)
|
|
} else {
|
|
canvas = document.createElement('canvas')
|
|
;(canvas.width = width), (canvas.height = height)
|
|
}
|
|
var context = canvas.getContext('2d')
|
|
context.fillStyle = 'rgba(255, 0, 0, 0)'
|
|
context.fill()
|
|
|
|
var imageData = context.getImageData(0, 0, width, height)
|
|
var data = imageData.data // layout: [r, g, b, a, r, g, b, a, ...]
|
|
|
|
return {
|
|
imageData: imageData,
|
|
set: function (x, y, rgba) {
|
|
var i = (y * width + x) * 4
|
|
data[i] = rgba[0]
|
|
data[i + 1] = rgba[1]
|
|
data[i + 2] = rgba[2]
|
|
data[i + 3] = rgba[3]
|
|
return this
|
|
}
|
|
}
|
|
},
|
|
|
|
reCreate: function (params, builder, offscreen) {
|
|
//这个纹理重复每次生成，也可以生成一次
|
|
var bounds = params.bounds
|
|
var mask = this.CreateMask(bounds.width, bounds.height, offscreen)
|
|
var velocityScale = currentData.velocityScale_o
|
|
|
|
var columns = []
|
|
var point = {}
|
|
let ySize = 0
|
|
|
|
function interpolateColumn(params, x) {
|
|
var column = []
|
|
ySize = 0
|
|
for (
|
|
var y = bounds.y;
|
|
y <= bounds.yMax;
|
|
y += currentData.INTERPOLATEDIV
|
|
) {
|
|
ySize++
|
|
point.x = x
|
|
point.y = y
|
|
|
|
var coord = currentData.ScreenToLonlat(params, point)
|
|
var color = currentData.TRANSPARENT_BLACK
|
|
var wind = null
|
|
if (coord) {
|
|
var lng_p = coord.longitude,
|
|
lat_p = coord.latitude
|
|
if (isFinite(lng_p)) {
|
|
if (builder) {
|
|
wind = builder.interpolate(lng_p, lat_p)
|
|
var scalar = null
|
|
if (wind) {
|
|
wind = currentData.distort(
|
|
params,
|
|
lng_p,
|
|
lat_p,
|
|
x,
|
|
y,
|
|
velocityScale,
|
|
wind
|
|
)
|
|
scalar = wind[2]
|
|
}
|
|
if (currentData.isValue(scalar)) {
|
|
color = currentData.extendedSinebowColor(
|
|
Math.min(scalar, 100) / 100,
|
|
currentData.OVERLAY_ALPHA
|
|
)
|
|
}
|
|
} else {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
column[y + 1] = column[y] = wind || currentData.HOLE_VECTOR
|
|
mask
|
|
.set(x, y, color)
|
|
.set(x + 1, y, color)
|
|
.set(x, y + 1, color)
|
|
.set(x + 1, y + 1, color)
|
|
}
|
|
columns[x + 1] = columns[x] = column
|
|
}
|
|
|
|
var x = bounds.x
|
|
while (x < bounds.xMax) {
|
|
interpolateColumn(params, x)
|
|
x += currentData.INTERPOLATEDIV
|
|
}
|
|
|
|
return { columns: columns, mask: mask }
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Produces a color style in a rainbow-like trefoil color space. Not quite HSV, but produces a nice
|
|
* spectrum. See http://krazydad.com/tutorials/makecolors.php.
|
|
*
|
|
* @param hue the hue rotation in the range [0, 1]
|
|
* @param a the alpha value in the range [0, 255]
|
|
* @returns {Array} [r, g, b, a]
|
|
*/
|
|
function sinebowColor(hue, a) {
|
|
// Map hue [0, 1] to radians [0, 5/6T]. Don't allow a full rotation because that keeps hue == 0 and
|
|
// hue == 1 from mapping to the same color.
|
|
var rad = (hue * 2 * Math.PI * 5) / 6
|
|
rad *= 0.75 // increase frequency to 2/3 cycle per rad
|
|
|
|
var s = Math.sin(rad)
|
|
var c = Math.cos(rad)
|
|
var r = Math.floor(Math.max(0, -c) * 255)
|
|
var g = Math.floor(Math.max(s, 0) * 255)
|
|
var b = Math.floor(Math.max(c, 0, -s) * 255)
|
|
return [r, g, b, a]
|
|
}
|
|
|
|
function colorInterpolator(start, end) {
|
|
var r = start[0],
|
|
g = start[1],
|
|
b = start[2]
|
|
var r2 = end[0] - r,
|
|
g2 = end[1] - g,
|
|
b2 = end[2] - b
|
|
return function (i, a) {
|
|
return [
|
|
Math.floor(r + i * r2),
|
|
Math.floor(g + i * g2),
|
|
Math.floor(b + i * b2),
|
|
a
|
|
]
|
|
}
|
|
}
|