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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /toolkit/modules/Geometry.sys.mjs | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'toolkit/modules/Geometry.sys.mjs')
-rw-r--r-- | toolkit/modules/Geometry.sys.mjs | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/toolkit/modules/Geometry.sys.mjs b/toolkit/modules/Geometry.sys.mjs new file mode 100644 index 0000000000..1eae68ce2a --- /dev/null +++ b/toolkit/modules/Geometry.sys.mjs @@ -0,0 +1,389 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/** + * Simple Point class. + * + * Any method that takes an x and y may also take a point. + */ +export function Point(x, y) { + this.set(x, y); +} + +Point.prototype = { + clone: function clone() { + return new Point(this.x, this.y); + }, + + set: function set(x, y) { + this.x = x; + this.y = y; + return this; + }, + + equals: function equals(x, y) { + return this.x == x && this.y == y; + }, + + toString: function toString() { + return "(" + this.x + "," + this.y + ")"; + }, + + map: function map(f) { + this.x = f.call(this, this.x); + this.y = f.call(this, this.y); + return this; + }, + + add: function add(x, y) { + this.x += x; + this.y += y; + return this; + }, + + subtract: function subtract(x, y) { + this.x -= x; + this.y -= y; + return this; + }, + + scale: function scale(s) { + this.x *= s; + this.y *= s; + return this; + }, + + isZero() { + return this.x == 0 && this.y == 0; + }, +}; + +(function () { + function takePointOrArgs(f) { + return function (arg1, arg2) { + if (arg2 === undefined) { + return f.call(this, arg1.x, arg1.y); + } + return f.call(this, arg1, arg2); + }; + } + + for (let f of ["add", "subtract", "equals", "set"]) { + Point.prototype[f] = takePointOrArgs(Point.prototype[f]); + } +})(); + +/** + * Rect is a simple data structure for representation of a rectangle supporting + * many basic geometric operations. + * + * NOTE: Since its operations are closed, rectangles may be empty and will report + * non-positive widths and heights in that case. + */ + +export function Rect(x, y, w, h) { + this.left = x; + this.top = y; + this.right = x + w; + this.bottom = y + h; +} + +Rect.fromRect = function fromRect(r) { + return new Rect(r.left, r.top, r.right - r.left, r.bottom - r.top); +}; + +Rect.prototype = { + get x() { + return this.left; + }, + get y() { + return this.top; + }, + get width() { + return this.right - this.left; + }, + get height() { + return this.bottom - this.top; + }, + set x(v) { + let diff = this.left - v; + this.left = v; + this.right -= diff; + }, + set y(v) { + let diff = this.top - v; + this.top = v; + this.bottom -= diff; + }, + set width(v) { + this.right = this.left + v; + }, + set height(v) { + this.bottom = this.top + v; + }, + + isEmpty: function isEmpty() { + return this.left >= this.right || this.top >= this.bottom; + }, + + setRect(x, y, w, h) { + this.left = x; + this.top = y; + this.right = x + w; + this.bottom = y + h; + + return this; + }, + + setBounds(l, t, r, b) { + this.top = t; + this.left = l; + this.bottom = b; + this.right = r; + + return this; + }, + + equals: function equals(other) { + return ( + other != null && + ((this.isEmpty() && other.isEmpty()) || + (this.top == other.top && + this.left == other.left && + this.bottom == other.bottom && + this.right == other.right)) + ); + }, + + clone: function clone() { + return new Rect( + this.left, + this.top, + this.right - this.left, + this.bottom - this.top + ); + }, + + center: function center() { + if (this.isEmpty()) { + throw new Error("Empty rectangles do not have centers"); + } + return new Point( + this.left + (this.right - this.left) / 2, + this.top + (this.bottom - this.top) / 2 + ); + }, + + copyFrom(other) { + this.top = other.top; + this.left = other.left; + this.bottom = other.bottom; + this.right = other.right; + + return this; + }, + + translate(x, y) { + this.left += x; + this.right += x; + this.top += y; + this.bottom += y; + + return this; + }, + + toString() { + return ( + "[" + this.x + "," + this.y + "," + this.width + "," + this.height + "]" + ); + }, + + /** return a new rect that is the union of that one and this one */ + union(other) { + return this.clone().expandToContain(other); + }, + + contains(other) { + if (other.isEmpty()) { + return true; + } + if (this.isEmpty()) { + return false; + } + + return ( + other.left >= this.left && + other.right <= this.right && + other.top >= this.top && + other.bottom <= this.bottom + ); + }, + + intersect(other) { + return this.clone().restrictTo(other); + }, + + intersects(other) { + if (this.isEmpty() || other.isEmpty()) { + return false; + } + + let x1 = Math.max(this.left, other.left); + let x2 = Math.min(this.right, other.right); + let y1 = Math.max(this.top, other.top); + let y2 = Math.min(this.bottom, other.bottom); + return x1 < x2 && y1 < y2; + }, + + /** Restrict area of this rectangle to the intersection of both rectangles. */ + restrictTo: function restrictTo(other) { + if (this.isEmpty() || other.isEmpty()) { + return this.setRect(0, 0, 0, 0); + } + + let x1 = Math.max(this.left, other.left); + let x2 = Math.min(this.right, other.right); + let y1 = Math.max(this.top, other.top); + let y2 = Math.min(this.bottom, other.bottom); + // If width or height is 0, the intersection was empty. + return this.setRect(x1, y1, Math.max(0, x2 - x1), Math.max(0, y2 - y1)); + }, + + /** Expand this rectangle to the union of both rectangles. */ + expandToContain: function expandToContain(other) { + if (this.isEmpty()) { + return this.copyFrom(other); + } + if (other.isEmpty()) { + return this; + } + + let l = Math.min(this.left, other.left); + let r = Math.max(this.right, other.right); + let t = Math.min(this.top, other.top); + let b = Math.max(this.bottom, other.bottom); + return this.setRect(l, t, r - l, b - t); + }, + + /** + * Expands to the smallest rectangle that contains original rectangle and is bounded + * by lines with integer coefficients. + */ + expandToIntegers: function round() { + this.left = Math.floor(this.left); + this.top = Math.floor(this.top); + this.right = Math.ceil(this.right); + this.bottom = Math.ceil(this.bottom); + return this; + }, + + scale: function scale(xscl, yscl) { + this.left *= xscl; + this.right *= xscl; + this.top *= yscl; + this.bottom *= yscl; + return this; + }, + + map: function map(f) { + this.left = f.call(this, this.left); + this.top = f.call(this, this.top); + this.right = f.call(this, this.right); + this.bottom = f.call(this, this.bottom); + return this; + }, + + /** Ensure this rectangle is inside the other, if possible. Preserves w, h. */ + translateInside: function translateInside(other) { + let offsetX = 0; + if (this.left <= other.left) { + offsetX = other.left - this.left; + } else if (this.right > other.right) { + offsetX = other.right - this.right; + } + + let offsetY = 0; + if (this.top <= other.top) { + offsetY = other.top - this.top; + } else if (this.bottom > other.bottom) { + offsetY = other.bottom - this.bottom; + } + + return this.translate(offsetX, offsetY); + }, + + /** Subtract other area from this. Returns array of rects whose union is this-other. */ + subtract: function subtract(other) { + let r = new Rect(0, 0, 0, 0); + let result = []; + other = other.intersect(this); + if (other.isEmpty()) { + return [this.clone()]; + } + + // left strip + r.setBounds(this.left, this.top, other.left, this.bottom); + if (!r.isEmpty()) { + result.push(r.clone()); + } + // inside strip + r.setBounds(other.left, this.top, other.right, other.top); + if (!r.isEmpty()) { + result.push(r.clone()); + } + r.setBounds(other.left, other.bottom, other.right, this.bottom); + if (!r.isEmpty()) { + result.push(r.clone()); + } + // right strip + r.setBounds(other.right, this.top, this.right, this.bottom); + if (!r.isEmpty()) { + result.push(r.clone()); + } + + return result; + }, + + /** + * Blends two rectangles together. + * @param rect Rectangle to blend this one with + * @param scalar Ratio from 0 (returns a clone of this rect) to 1 (clone of rect). + * @return New blended rectangle. + */ + blend: function blend(rect, scalar) { + return new Rect( + this.left + (rect.left - this.left) * scalar, + this.top + (rect.top - this.top) * scalar, + this.width + (rect.width - this.width) * scalar, + this.height + (rect.height - this.height) * scalar + ); + }, + + /** + * Grows or shrinks the rectangle while keeping the center point. + * Accepts single multipler, or separate for both axes. + */ + inflate: function inflate(xscl, yscl) { + let xAdj = (this.width * xscl - this.width) / 2; + let s = arguments.length > 1 ? yscl : xscl; + let yAdj = (this.height * s - this.height) / 2; + this.left -= xAdj; + this.right += xAdj; + this.top -= yAdj; + this.bottom += yAdj; + return this; + }, + + /** + * Grows or shrinks the rectangle by fixed amount while keeping the center point. + * Accepts single fixed amount + */ + inflateFixed: function inflateFixed(fixed) { + this.left -= fixed; + this.right += fixed; + this.top -= fixed; + this.bottom += fixed; + return this; + }, +}; |