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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* 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/. */
+
+this.EXPORTED_SYMBOLS = ["Point", "Rect"];
+
+/**
+ * Simple Point class.
+ *
+ * Any method that takes an x and y may also take a point.
+ */
+this.Point = 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: function() {
+ 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.
+ */
+
+this.Rect = 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: function(x, y, w, h) {
+ this.left = x;
+ this.top = y;
+ this.right = x+w;
+ this.bottom = y+h;
+
+ return this;
+ },
+
+ setBounds: function(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 "Empty rectangles do not have centers";
+ return new Point(this.left + (this.right - this.left) / 2,
+ this.top + (this.bottom - this.top) / 2);
+ },
+
+ copyFrom: function(other) {
+ this.top = other.top;
+ this.left = other.left;
+ this.bottom = other.bottom;
+ this.right = other.right;
+
+ return this;
+ },
+
+ translate: function(x, y) {
+ this.left += x;
+ this.right += x;
+ this.top += y;
+ this.bottom += y;
+
+ return this;
+ },
+
+ toString: function() {
+ return "[" + this.x + "," + this.y + "," + this.width + "," + this.height + "]";
+ },
+
+ /** return a new rect that is the union of that one and this one */
+ union: function(other) {
+ return this.clone().expandToContain(other);
+ },
+
+ contains: function(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: function(other) {
+ return this.clone().restrictTo(other);
+ },
+
+ intersects: function(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;
+ }
+};