зеркало из https://github.com/mozilla/gecko-dev.git
335 строки
8.6 KiB
JavaScript
335 строки
8.6 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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this.EXPORTED_SYMBOLS = ["Point", "Rect"];
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/**
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* Simple Point class.
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*
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* Any method that takes an x and y may also take a point.
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*/
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this.Point = function Point(x, y) {
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this.set(x, y);
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}
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Point.prototype = {
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clone: function clone() {
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return new Point(this.x, this.y);
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},
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set: function set(x, y) {
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this.x = x;
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this.y = y;
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return this;
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},
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equals: function equals(x, y) {
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return this.x == x && this.y == y;
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},
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toString: function toString() {
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return "(" + this.x + "," + this.y + ")";
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},
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map: function map(f) {
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this.x = f.call(this, this.x);
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this.y = f.call(this, this.y);
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return this;
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},
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add: function add(x, y) {
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this.x += x;
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this.y += y;
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return this;
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},
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subtract: function subtract(x, y) {
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this.x -= x;
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this.y -= y;
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return this;
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},
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scale: function scale(s) {
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this.x *= s;
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this.y *= s;
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return this;
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},
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isZero: function() {
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return this.x == 0 && this.y == 0;
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}
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};
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(function() {
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function takePointOrArgs(f) {
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return function(arg1, arg2) {
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if (arg2 === undefined)
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return f.call(this, arg1.x, arg1.y);
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return f.call(this, arg1, arg2);
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};
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}
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for (let f of ['add', 'subtract', 'equals', 'set'])
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Point.prototype[f] = takePointOrArgs(Point.prototype[f]);
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})();
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/**
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* Rect is a simple data structure for representation of a rectangle supporting
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* many basic geometric operations.
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*
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* NOTE: Since its operations are closed, rectangles may be empty and will report
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* non-positive widths and heights in that case.
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*/
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this.Rect = function Rect(x, y, w, h) {
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this.left = x;
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this.top = y;
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this.right = x + w;
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this.bottom = y + h;
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};
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Rect.fromRect = function fromRect(r) {
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return new Rect(r.left, r.top, r.right - r.left, r.bottom - r.top);
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};
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Rect.prototype = {
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get x() { return this.left; },
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get y() { return this.top; },
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get width() { return this.right - this.left; },
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get height() { return this.bottom - this.top; },
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set x(v) {
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let diff = this.left - v;
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this.left = v;
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this.right -= diff;
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},
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set y(v) {
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let diff = this.top - v;
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this.top = v;
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this.bottom -= diff;
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},
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set width(v) { this.right = this.left + v; },
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set height(v) { this.bottom = this.top + v; },
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isEmpty: function isEmpty() {
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return this.left >= this.right || this.top >= this.bottom;
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},
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setRect: function(x, y, w, h) {
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this.left = x;
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this.top = y;
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this.right = x+w;
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this.bottom = y+h;
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return this;
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},
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setBounds: function(l, t, r, b) {
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this.top = t;
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this.left = l;
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this.bottom = b;
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this.right = r;
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return this;
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},
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equals: function equals(other) {
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return other != null &&
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(this.isEmpty() && other.isEmpty() ||
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this.top == other.top &&
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this.left == other.left &&
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this.bottom == other.bottom &&
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this.right == other.right);
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},
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clone: function clone() {
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return new Rect(this.left, this.top, this.right - this.left, this.bottom - this.top);
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},
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center: function center() {
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if (this.isEmpty())
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throw "Empty rectangles do not have centers";
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return new Point(this.left + (this.right - this.left) / 2,
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this.top + (this.bottom - this.top) / 2);
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},
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copyFrom: function(other) {
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this.top = other.top;
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this.left = other.left;
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this.bottom = other.bottom;
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this.right = other.right;
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return this;
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},
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translate: function(x, y) {
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this.left += x;
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this.right += x;
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this.top += y;
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this.bottom += y;
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return this;
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},
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toString: function() {
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return "[" + this.x + "," + this.y + "," + this.width + "," + this.height + "]";
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},
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/** return a new rect that is the union of that one and this one */
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union: function(other) {
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return this.clone().expandToContain(other);
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},
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contains: function(other) {
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if (other.isEmpty()) return true;
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if (this.isEmpty()) return false;
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return (other.left >= this.left &&
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other.right <= this.right &&
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other.top >= this.top &&
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other.bottom <= this.bottom);
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},
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intersect: function(other) {
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return this.clone().restrictTo(other);
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},
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intersects: function(other) {
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if (this.isEmpty() || other.isEmpty())
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return false;
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let x1 = Math.max(this.left, other.left);
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let x2 = Math.min(this.right, other.right);
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let y1 = Math.max(this.top, other.top);
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let y2 = Math.min(this.bottom, other.bottom);
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return x1 < x2 && y1 < y2;
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},
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/** Restrict area of this rectangle to the intersection of both rectangles. */
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restrictTo: function restrictTo(other) {
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if (this.isEmpty() || other.isEmpty())
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return this.setRect(0, 0, 0, 0);
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let x1 = Math.max(this.left, other.left);
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let x2 = Math.min(this.right, other.right);
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let y1 = Math.max(this.top, other.top);
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let y2 = Math.min(this.bottom, other.bottom);
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// If width or height is 0, the intersection was empty.
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return this.setRect(x1, y1, Math.max(0, x2 - x1), Math.max(0, y2 - y1));
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},
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/** Expand this rectangle to the union of both rectangles. */
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expandToContain: function expandToContain(other) {
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if (this.isEmpty()) return this.copyFrom(other);
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if (other.isEmpty()) return this;
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let l = Math.min(this.left, other.left);
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let r = Math.max(this.right, other.right);
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let t = Math.min(this.top, other.top);
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let b = Math.max(this.bottom, other.bottom);
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return this.setRect(l, t, r-l, b-t);
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},
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/**
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* Expands to the smallest rectangle that contains original rectangle and is bounded
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* by lines with integer coefficients.
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*/
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expandToIntegers: function round() {
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this.left = Math.floor(this.left);
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this.top = Math.floor(this.top);
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this.right = Math.ceil(this.right);
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this.bottom = Math.ceil(this.bottom);
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return this;
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},
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scale: function scale(xscl, yscl) {
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this.left *= xscl;
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this.right *= xscl;
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this.top *= yscl;
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this.bottom *= yscl;
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return this;
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},
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map: function map(f) {
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this.left = f.call(this, this.left);
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this.top = f.call(this, this.top);
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this.right = f.call(this, this.right);
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this.bottom = f.call(this, this.bottom);
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return this;
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},
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/** Ensure this rectangle is inside the other, if possible. Preserves w, h. */
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translateInside: function translateInside(other) {
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let offsetX = 0;
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if (this.left <= other.left)
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offsetX = other.left - this.left;
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else if (this.right > other.right)
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offsetX = other.right - this.right;
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let offsetY = 0;
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if (this.top <= other.top)
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offsetY = other.top - this.top;
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else if (this.bottom > other.bottom)
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offsetY = other.bottom - this.bottom;
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return this.translate(offsetX, offsetY);
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},
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/** Subtract other area from this. Returns array of rects whose union is this-other. */
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subtract: function subtract(other) {
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let r = new Rect(0, 0, 0, 0);
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let result = [];
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other = other.intersect(this);
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if (other.isEmpty())
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return [this.clone()];
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// left strip
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r.setBounds(this.left, this.top, other.left, this.bottom);
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if (!r.isEmpty())
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result.push(r.clone());
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// inside strip
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r.setBounds(other.left, this.top, other.right, other.top);
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if (!r.isEmpty())
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result.push(r.clone());
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r.setBounds(other.left, other.bottom, other.right, this.bottom);
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if (!r.isEmpty())
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result.push(r.clone());
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// right strip
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r.setBounds(other.right, this.top, this.right, this.bottom);
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if (!r.isEmpty())
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result.push(r.clone());
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return result;
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},
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/**
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* Blends two rectangles together.
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* @param rect Rectangle to blend this one with
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* @param scalar Ratio from 0 (returns a clone of this rect) to 1 (clone of rect).
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* @return New blended rectangle.
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*/
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blend: function blend(rect, scalar) {
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return new Rect(
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this.left + (rect.left - this.left ) * scalar,
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this.top + (rect.top - this.top ) * scalar,
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this.width + (rect.width - this.width ) * scalar,
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this.height + (rect.height - this.height) * scalar);
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},
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/**
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* Grows or shrinks the rectangle while keeping the center point.
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* Accepts single multipler, or separate for both axes.
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*/
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inflate: function inflate(xscl, yscl) {
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let xAdj = (this.width * xscl - this.width) / 2;
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let s = (arguments.length > 1) ? yscl : xscl;
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let yAdj = (this.height * s - this.height) / 2;
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this.left -= xAdj;
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this.right += xAdj;
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this.top -= yAdj;
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this.bottom += yAdj;
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return this;
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}
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};
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