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Unified Diff: tracing/tracing/base/math.html

Issue 2771723003: [tracing] Move math utilities from base into their own subdirectory (attempt 2) (Closed)
Patch Set: rebase Created 3 years, 9 months ago
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Index: tracing/tracing/base/math.html
diff --git a/tracing/tracing/base/math.html b/tracing/tracing/base/math.html
deleted file mode 100644
index 0a71cb1cbc57fe33ddb5462ff4878a2462dd7239..0000000000000000000000000000000000000000
--- a/tracing/tracing/base/math.html
+++ /dev/null
@@ -1,248 +0,0 @@
-<!DOCTYPE html>
-<!--
-Copyright (c) 2014 The Chromium Authors. All rights reserved.
-Use of this source code is governed by a BSD-style license that can be
-found in the LICENSE file.
--->
-<link rel="import" href="/tracing/base/base.html">
-<script src="/gl-matrix-min.js"></script>
-
-<script>
-'use strict';
-
-// In node, the script-src for gl-matrix-min above brings in glmatrix into
-// a module, instead of into the global scope. Whereas, Tracing code
-// assumes that glMatrix is in the global scope. So, in Node only, we
-// require() it in, and then take all its exports and shove them into the
-// global scope by hand.
-(function(global) {
- if (tr.isNode) {
- var glMatrixAbsPath = HTMLImportsLoader.hrefToAbsolutePath(
- '/gl-matrix-min.js');
- var glMatrixModule = require(glMatrixAbsPath);
- for (var exportName in glMatrixModule) {
- global[exportName] = glMatrixModule[exportName];
- }
- }
-})(this);
-</script>
-
-<script>
-'use strict';
-
-tr.exportTo('tr.b', function() {
- var PREFERRED_NUMBER_SERIES_MULTIPLIERS = [1, 2, 5, 10];
-
- /* Returns true when x and y are within delta of each other. */
- function approximately(x, y, delta) {
- if (delta === undefined)
- delta = 1e-9;
- return Math.abs(x - y) < delta;
- }
-
- function clamp(x, lo, hi) {
- return Math.min(Math.max(x, lo), hi);
- }
-
- function lerp(percentage, lo, hi) {
- var range = hi - lo;
- return lo + percentage * range;
- }
-
- function normalize(value, lo, hi) {
- return (value - lo) / (hi - lo);
- }
-
- function deg2rad(deg) {
- return (Math.PI * deg) / 180.0;
- }
-
- /* The Gauss error function gives the probability that a measurement (which is
- * under the influence of normally distributed errors with standard deviation
- * sigma = 1) is less than x from the mean value of the standard normal
- * distribution.
- * https://www.desmos.com/calculator/t1v4bdpske
- *
- * @param {number} x A tolerance for error.
- * @return {number} The probability that a measurement is less than |x| from
- * the mean value of the standard normal distribution.
- */
- function erf(x) {
- // save the sign of x
- // erf(-x) = -erf(x);
- var sign = (x >= 0) ? 1 : -1;
- x = Math.abs(x);
-
- // constants
- var a1 = 0.254829592;
- var a2 = -0.284496736;
- var a3 = 1.421413741;
- var a4 = -1.453152027;
- var a5 = 1.061405429;
- var p = 0.3275911;
-
- // Abramowitz and Stegun formula 7.1.26
- // maximum error: 1.5e-7
- var t = 1.0 / (1.0 + p * x);
- var y = 1.0 - (((((a5 * t + a4) * t) + a3) * t + a2) * t + a1) * t *
- Math.exp(-x * x);
- return sign * y;
- }
-
- var tmpVec2 = vec2.create();
- var tmpVec2b = vec2.create();
- var tmpVec4 = vec4.create();
- var tmpMat2d = mat2d.create();
-
- vec2.createFromArray = function(arr) {
- if (arr.length !== 2)
- throw new Error('Should be length 2');
- var v = vec2.create();
- vec2.set(v, arr[0], arr[1]);
- return v;
- };
-
- vec2.createXY = function(x, y) {
- var v = vec2.create();
- vec2.set(v, x, y);
- return v;
- };
-
- vec2.toString = function(a) {
- return '[' + a[0] + ', ' + a[1] + ']';
- };
-
- vec2.addTwoScaledUnitVectors = function(out, u1, scale1, u2, scale2) {
- // out = u1 * scale1 + u2 * scale2
- vec2.scale(tmpVec2, u1, scale1);
- vec2.scale(tmpVec2b, u2, scale2);
- vec2.add(out, tmpVec2, tmpVec2b);
- };
-
- vec2.interpolatePiecewiseFunction = function(points, x) {
- if (x < points[0][0])
- return points[0][1];
- for (var i = 1; i < points.length; ++i) {
- if (x < points[i][0]) {
- var percent = normalize(x, points[i - 1][0], points[i][0]);
- return lerp(percent, points[i - 1][1], points[i][1]);
- }
- }
- return points[points.length - 1][1];
- };
-
- vec3.createXYZ = function(x, y, z) {
- var v = vec3.create();
- vec3.set(v, x, y, z);
- return v;
- };
-
- vec3.toString = function(a) {
- return 'vec3(' + a[0] + ', ' + a[1] + ', ' + a[2] + ')';
- };
-
- mat2d.translateXY = function(out, x, y) {
- vec2.set(tmpVec2, x, y);
- mat2d.translate(out, out, tmpVec2);
- };
-
- mat2d.scaleXY = function(out, x, y) {
- vec2.set(tmpVec2, x, y);
- mat2d.scale(out, out, tmpVec2);
- };
-
- vec4.unitize = function(out, a) {
- out[0] = a[0] / a[3];
- out[1] = a[1] / a[3];
- out[2] = a[2] / a[3];
- out[3] = 1;
- return out;
- };
-
- vec2.copyFromVec4 = function(out, a) {
- vec4.unitize(tmpVec4, a);
- vec2.copy(out, tmpVec4);
- };
-
- /**
- * @param {number} x
- * @param {number=} opt_base Defaults to 10
- * @return {number}
- */
- function logOrLog10(x, base) {
- if (base === 10) return Math.log10(x);
- return Math.log(x) / Math.log(base);
- }
-
- /**
- * @param {number} x
- * @param {number=} opt_base Defaults to 10
- * @return {number}
- */
- function lesserPower(x, opt_base) {
- var base = opt_base || 10;
- return Math.pow(base, Math.floor(logOrLog10(x, base)));
- }
-
- /**
- * @param {number} x
- * @param {number=} opt_base Defaults to 10
- * @return {number}
- */
- function greaterPower(x, opt_base) {
- var base = opt_base || 10;
- return Math.pow(base, Math.ceil(logOrLog10(x, base)));
- }
-
- function lesserWholeNumber(x) {
- if (x === 0) return 0;
- const pow10 = (x < 0) ? -lesserPower(-x) : lesserPower(x);
- return pow10 * Math.floor(x / pow10);
- }
-
- function greaterWholeNumber(x) {
- if (x === 0) return 0;
- const pow10 = (x < 0) ? -lesserPower(-x) : lesserPower(x);
- return pow10 * Math.ceil(x / pow10);
- }
-
- /**
- * Uses the 1-2-5 series to find the closest prefered number to min
- * whose absolute value is at least the absolute value of |min|.
- * https://en.wikipedia.org/wiki/Preferred_number
- */
- function preferredNumberLargerThanMin(min) {
- var absMin = Math.abs(min);
- // The conservative guess is the largest power of 10 less than
- // or equal to |absMin|.
- var conservativeGuess = tr.b.lesserPower(absMin);
- var minPreferedNumber = undefined;
- for (var multiplier of PREFERRED_NUMBER_SERIES_MULTIPLIERS) {
- var tightenedGuess = conservativeGuess * multiplier;
- if (tightenedGuess >= absMin) {
- minPreferedNumber = tightenedGuess;
- break;
- }
- }
- if (minPreferedNumber === undefined) {
- throw new Error('Could not compute preferred number for ' + min);
- }
- if (min < 0) minPreferedNumber *= -1;
- return minPreferedNumber;
- }
-
- return {
- approximately,
- clamp,
- lerp,
- normalize,
- deg2rad,
- erf,
- lesserPower,
- greaterPower,
- lesserWholeNumber,
- greaterWholeNumber,
- preferredNumberLargerThanMin,
- };
-});
-</script>
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