mirror of
https://github.com/openseadragon/openseadragon.git
synced 2024-11-22 05:06:09 +03:00
Extend Rect class to support rotation.
This commit is contained in:
Antoine Vandecreme
parent
4bbcd63826
commit
94186826af
202
src/rectangle.js
202
src/rectangle.js
@ -36,42 +36,63 @@
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/**
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* @class Rect
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* @classdesc A Rectangle really represents a 2x2 matrix where each row represents a
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* 2 dimensional vector component, the first is (x,y) and the second is
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* (width, height). The latter component implies the equation of a simple
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* plane.
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* @classdesc A Rectangle is described by it top left coordinates (x, y), width,
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* height and degrees of rotation around (x, y).
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* Note that the coordinate system used is the one commonly used with images:
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* x increases when going to the right
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* y increases when going to the bottom
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* degrees increases clockwise with 0 being the horizontal
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*
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* @memberof OpenSeadragon
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* @param {Number} x The vector component 'x'.
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* @param {Number} y The vector component 'y'.
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* @param {Number} width The vector component 'height'.
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* @param {Number} height The vector component 'width'.
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* @param {Object} options
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* @param {Number} options.x X coordinate of the top left corner of the rectangle.
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* @param {Number} options.y Y coordinate of the top left corner of the rectangle.
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* @param {Number} options.width Width of the rectangle.
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* @param {Number} options.height Height of the rectangle.
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* @param {Number} options.degrees Rotation of the rectangle around (x,y) in degrees.
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* @param {Number} [x] Deprecated: The vector component 'x'.
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* @param {Number} [y] Deprecated: The vector component 'y'.
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* @param {Number} [width] Deprecated: The vector component 'width'.
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* @param {Number} [height] Deprecated: The vector component 'height'.
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*/
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$.Rect = function(x, y, width, height) {
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var options = x;
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if (!$.isPlainObject(options)) {
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options = {
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x: x,
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y: y,
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width: width,
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height: height
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};
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}
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/**
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* The vector component 'x'.
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* @member {Number} x
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* @memberof OpenSeadragon.Rect#
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*/
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this.x = typeof ( x ) == "number" ? x : 0;
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this.x = typeof(options.x) === "number" ? options.x : 0;
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/**
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* The vector component 'y'.
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* @member {Number} y
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* @memberof OpenSeadragon.Rect#
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*/
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this.y = typeof ( y ) == "number" ? y : 0;
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this.y = typeof(options.y) === "number" ? options.y : 0;
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/**
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* The vector component 'width'.
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* @member {Number} width
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* @memberof OpenSeadragon.Rect#
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*/
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this.width = typeof ( width ) == "number" ? width : 0;
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this.width = typeof(options.width) === "number" ? options.width : 0;
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/**
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* The vector component 'height'.
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* @member {Number} height
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* @memberof OpenSeadragon.Rect#
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*/
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this.height = typeof ( height ) == "number" ? height : 0;
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this.height = typeof(options.height) === "number" ? options.height : 0;
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this.degrees = typeof(options.degrees) === "number" ? options.degrees : 0;
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};
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$.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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@ -80,7 +101,13 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* @returns {OpenSeadragon.Rect} a duplicate of this Rect
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*/
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clone: function() {
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return new $.Rect(this.x, this.y, this.width, this.height);
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return new $.Rect({
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x: this.x,
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y: this.y,
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width: this.width,
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height: this.height,
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degrees: this.degrees
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});
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},
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/**
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@ -114,10 +141,8 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* the rectangle.
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*/
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getBottomRight: function() {
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return new $.Point(
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this.x + this.width,
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this.y + this.height
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);
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return new $.Point(this.x + this.width, this.y + this.height)
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.rotate(this.degrees, this.getTopLeft());
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},
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/**
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@ -128,10 +153,8 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* the rectangle.
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*/
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getTopRight: function() {
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return new $.Point(
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this.x + this.width,
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this.y
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);
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return new $.Point(this.x + this.width, this.y)
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.rotate(this.degrees, this.getTopLeft());
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},
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/**
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@ -142,10 +165,8 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* the rectangle.
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*/
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getBottomLeft: function() {
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return new $.Point(
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this.x,
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this.y + this.height
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);
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return new $.Point(this.x, this.y + this.height)
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.rotate(this.degrees, this.getTopLeft());
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},
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/**
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@ -158,7 +179,7 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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return new $.Point(
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this.x + this.width / 2.0,
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this.y + this.height / 2.0
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);
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).rotate(this.degrees, this.getTopLeft());
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},
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/**
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@ -179,26 +200,29 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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*/
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equals: function(other) {
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return (other instanceof $.Rect) &&
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( this.x === other.x ) &&
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( this.y === other.y ) &&
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( this.width === other.width ) &&
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( this.height === other.height );
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this.x === other.x &&
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this.y === other.y &&
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this.width === other.width &&
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this.height === other.height &&
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this.degrees === other.degrees;
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},
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/**
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* Multiply all dimensions in this Rect by a factor and return a new Rect.
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* Multiply all dimensions (except degrees) in this Rect by a factor and
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* return a new Rect.
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* @function
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* @param {Number} factor The factor to multiply vector components.
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* @returns {OpenSeadragon.Rect} A new rect representing the multiplication
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* of the vector components by the factor
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*/
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times: function(factor) {
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return new OpenSeadragon.Rect(
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this.x * factor,
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this.y * factor,
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this.width * factor,
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this.height * factor
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);
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return new $.Rect({
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x: this.x * factor,
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y: this.y * factor,
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width: this.width * factor,
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height: this.height * factor,
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degrees: this.degrees
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});
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},
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/**
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@ -208,12 +232,13 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* @returns {OpenSeadragon.Rect} A new rect with altered position
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*/
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translate: function(delta) {
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return new OpenSeadragon.Rect(
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this.x + delta.x,
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this.y + delta.y,
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this.width,
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this.height
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);
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return new $.Rect({
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x: this.x + delta.x,
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y: this.y + delta.y,
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width: this.width,
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height: this.height,
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degrees: this.degrees
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});
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},
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/**
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@ -223,17 +248,24 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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*/
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// ----------
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union: function(rect) {
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if (this.degrees !== 0 || rect.degrees !== 0) {
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throw new Error('Only union of non rotated rectangles are supported.');
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}
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var left = Math.min(this.x, rect.x);
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var top = Math.min(this.y, rect.y);
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var right = Math.max(this.x + this.width, rect.x + rect.width);
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var bottom = Math.max(this.y + this.height, rect.y + rect.height);
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return new OpenSeadragon.Rect(left, top, right - left, bottom - top);
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return new $.Rect({
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left: left,
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top: top,
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width: right - left,
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height: bottom - top
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});
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},
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/**
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* Rotates a rectangle around a point. Currently only 90, 180, and 270
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* degrees are supported.
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* Rotates a rectangle around a point.
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* @function
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* @param {Number} degrees The angle in degrees to rotate.
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* @param {OpenSeadragon.Point} pivot The point about which to rotate.
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@ -241,49 +273,54 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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* @return {OpenSeadragon.Rect}
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*/
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rotate: function(degrees, pivot) {
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// TODO support arbitrary rotation
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var width = this.width,
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height = this.height,
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newTopLeft;
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degrees = (degrees + 360) % 360;
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if (degrees % 90 !== 0) {
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throw new Error('Currently only 0, 90, 180, and 270 degrees are supported.');
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}
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if (degrees === 0) {
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return new $.Rect(
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this.x,
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this.y,
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this.width,
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this.height
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);
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return this.clone();
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}
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pivot = pivot || this.getCenter();
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var newTopLeft = this.getTopLeft().rotate(degrees, pivot);
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var newTopRight = this.getTopRight().rotate(degrees, pivot);
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switch ( degrees ) {
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case 90:
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newTopLeft = this.getBottomLeft();
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width = this.height;
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height = this.width;
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break;
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case 180:
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newTopLeft = this.getBottomRight();
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break;
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case 270:
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newTopLeft = this.getTopRight();
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width = this.height;
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height = this.width;
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break;
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default:
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newTopLeft = this.getTopLeft();
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break;
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var diff = newTopRight.minus(newTopLeft);
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var radians = Math.atan(diff.y / diff.x);
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if (diff.x < 0) {
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radians += Math.PI;
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} else if (diff.y < 0) {
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radians += 2 * Math.PI;
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}
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return new $.Rect({
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x: newTopLeft.x,
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y: newTopLeft.y,
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width: this.width,
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height: this.height,
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degrees: radians / Math.PI * 180
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});
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},
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newTopLeft = newTopLeft.rotate(degrees, pivot);
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return new $.Rect(newTopLeft.x, newTopLeft.y, width, height);
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/**
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* Retrieves the smallest horizontal (degrees=0) rectangle which contains
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* this rectangle.
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* @returns {OpenSeadrayon.Rect}
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*/
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getBoundingBox: function() {
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if (this.degrees === 0) {
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return this.clone();
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}
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var topLeft = this.getTopLeft();
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var topRight = this.getTopRight();
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var bottomLeft = this.getBottomLeft();
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var bottomRight = this.getBottomRight();
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var minX = Math.min(topLeft.x, topRight.x, bottomLeft.x, bottomRight.x);
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var maxX = Math.max(topLeft.x, topRight.x, bottomLeft.x, bottomRight.x);
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var minY = Math.min(topLeft.y, topRight.y, bottomLeft.y, bottomRight.y);
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var maxY = Math.max(topLeft.y, topRight.y, bottomLeft.y, bottomRight.y);
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return new $.Rect({
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x: minX,
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y: minY,
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width: maxX - minX,
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height: maxY - minY
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});
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},
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/**
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@ -297,7 +334,8 @@ $.Rect.prototype = /** @lends OpenSeadragon.Rect.prototype */{
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(Math.round(this.x * 100) / 100) + "," +
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(Math.round(this.y * 100) / 100) + "," +
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(Math.round(this.width * 100) / 100) + "x" +
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(Math.round(this.height*100) / 100) +
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(Math.round(this.height * 100) / 100) + "," +
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(Math.round(this.degrees * 100) / 100) + "°" +
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"]";
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}
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};
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@ -75,6 +75,7 @@
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<script src="/test/modules/tilesource.js"></script>
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<script src="/test/modules/tilesourcecollection.js"></script>
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<script src="/test/modules/spring.js"></script>
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<script src="/test/modules/rectangle.js"></script>
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<!-- The navigator tests are the slowest (for now; hopefully they can be sped up)
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so we put them last. -->
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<script src="/test/modules/navigator.js"></script>
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260
test/modules/rectangle.js
Normal file
260
test/modules/rectangle.js
Normal file
@ -0,0 +1,260 @@
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/* global module, asyncTest, $, ok, equal, notEqual, start, test, Util, testLog */
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(function() {
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module('Rectangle', {});
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var precision = 0.000000001;
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function assertPointsEquals(pointA, pointB, message) {
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Util.assessNumericValue(pointA.x, pointB.x, precision, message + " x: ");
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Util.assessNumericValue(pointA.y, pointB.y, precision, message + " y: ");
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}
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function assertRectangleEquals(rectA, rectB, message) {
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Util.assessNumericValue(rectA.x, rectB.x, precision, message + " x: ");
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Util.assessNumericValue(rectA.y, rectB.y, precision, message + " y: ");
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Util.assessNumericValue(rectA.width, rectB.width, precision,
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message + " width: ");
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Util.assessNumericValue(rectA.height, rectB.height, precision,
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message + " height: ");
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Util.assessNumericValue(rectA.degrees, rectB.degrees, precision,
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message + " degrees: ");
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}
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test('Legacy constructor', function() {
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var rect = new OpenSeadragon.Rect(1, 2, 3, 4);
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strictEqual(rect.x, 1, 'rect.x should be 1');
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strictEqual(rect.y, 2, 'rect.y should be 2');
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strictEqual(rect.width, 3, 'rect.width should be 3');
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strictEqual(rect.height, 4, 'rect.height should be 4');
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strictEqual(rect.degrees, 0, 'rect.degrees should be 0');
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});
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test('Constructor', function() {
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var rect = new OpenSeadragon.Rect({
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x: 1,
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y: 2,
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width: 3,
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height: 4,
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degrees: 5
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});
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strictEqual(rect.x, 1, 'rect.x should be 1');
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strictEqual(rect.y, 2, 'rect.y should be 2');
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strictEqual(rect.width, 3, 'rect.width should be 3');
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strictEqual(rect.height, 4, 'rect.height should be 4');
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strictEqual(rect.degrees, 5, 'rect.degrees should be 5');
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rect = new OpenSeadragon.Rect({});
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strictEqual(rect.x, 0, 'rect.x should be 0');
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strictEqual(rect.y, 0, 'rect.y should be 0');
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strictEqual(rect.width, 0, 'rect.width should be 0');
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strictEqual(rect.height, 0, 'rect.height should be 0');
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strictEqual(rect.degrees, 0, 'rect.degrees should be 0');
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});
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test('getTopLeft', function() {
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var rect = new OpenSeadragon.Rect({
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x: 1,
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y: 2,
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width: 3,
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height: 4,
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degrees: 5
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});
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var expected = new OpenSeadragon.Point(1, 2);
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ok(expected.equals(rect.getTopLeft()), "Incorrect top left point.");
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});
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test('getTopRight', function() {
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var rect = new OpenSeadragon.Rect({
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x: 0,
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y: 0,
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width: 1,
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height: 3
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});
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var expected = new OpenSeadragon.Point(1, 0);
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ok(expected.equals(rect.getTopRight()), "Incorrect top right point.");
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rect.degrees = 45;
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expected = new OpenSeadragon.Point(1 / Math.sqrt(2), 1 / Math.sqrt(2));
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assertPointsEquals(expected, rect.getTopRight(),
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"Incorrect top right point with rotation.");
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});
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test('getBottomLeft', function() {
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var rect = new OpenSeadragon.Rect({
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x: 0,
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y: 0,
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width: 3,
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height: 1
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});
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var expected = new OpenSeadragon.Point(0, 1);
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ok(expected.equals(rect.getBottomLeft()), "Incorrect bottom left point.");
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rect.degrees = 45;
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expected = new OpenSeadragon.Point(-1 / Math.sqrt(2), 1 / Math.sqrt(2));
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assertPointsEquals(expected, rect.getBottomLeft(),
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"Incorrect bottom left point with rotation.");
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});
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test('getBottomRight', function() {
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var rect = new OpenSeadragon.Rect({
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x: 0,
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y: 0,
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width: 1,
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height: 1
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});
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var expected = new OpenSeadragon.Point(1, 1);
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ok(expected.equals(rect.getBottomRight()), "Incorrect bottom right point.");
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rect.degrees = 45;
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expected = new OpenSeadragon.Point(0, Math.sqrt(2));
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assertPointsEquals(expected, rect.getBottomRight(),
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"Incorrect bottom right point with 45 rotation.");
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rect.degrees = 90;
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expected = new OpenSeadragon.Point(-1, 1);
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assertPointsEquals(expected, rect.getBottomRight(),
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"Incorrect bottom right point with 90 rotation.");
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rect.degrees = 135;
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expected = new OpenSeadragon.Point(-Math.sqrt(2), 0);
|
||||
assertPointsEquals(expected, rect.getBottomRight(),
|
||||
"Incorrect bottom right point with 135 rotation.");
|
||||
});
|
||||
|
||||
test('getCenter', function() {
|
||||
var rect = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 1,
|
||||
height: 1
|
||||
});
|
||||
var expected = new OpenSeadragon.Point(0.5, 0.5);
|
||||
ok(expected.equals(rect.getCenter()), "Incorrect center point.");
|
||||
|
||||
rect.degrees = 45;
|
||||
expected = new OpenSeadragon.Point(0, 0.5 * Math.sqrt(2));
|
||||
assertPointsEquals(expected, rect.getCenter(),
|
||||
"Incorrect bottom right point with 45 rotation.");
|
||||
|
||||
rect.degrees = 90;
|
||||
expected = new OpenSeadragon.Point(-0.5, 0.5);
|
||||
assertPointsEquals(expected, rect.getCenter(),
|
||||
"Incorrect bottom right point with 90 rotation.");
|
||||
|
||||
rect.degrees = 135;
|
||||
expected = new OpenSeadragon.Point(-0.5 * Math.sqrt(2), 0);
|
||||
assertPointsEquals(expected, rect.getCenter(),
|
||||
"Incorrect bottom right point with 135 rotation.");
|
||||
});
|
||||
|
||||
test('rotate', function() {
|
||||
var rect = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 1
|
||||
});
|
||||
|
||||
// Rotate 45deg around center.
|
||||
var expected = new OpenSeadragon.Rect({
|
||||
x: 1 - 1 / (2 * Math.sqrt(2)),
|
||||
y: 0.5 - 3 / (2 * Math.sqrt(2)),
|
||||
width: 2,
|
||||
height: 1,
|
||||
degrees: 45
|
||||
});
|
||||
var actual = rect.rotate(45);
|
||||
assertRectangleEquals(expected, actual,
|
||||
"Incorrect rectangle after rotation of 45deg around center.");
|
||||
|
||||
expected = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 1,
|
||||
degrees: 33
|
||||
});
|
||||
actual = rect.rotate(33, rect.getTopLeft());
|
||||
assertRectangleEquals(expected, actual,
|
||||
"Incorrect rectangle after rotation of 33deg around topLeft.");
|
||||
|
||||
expected = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 1,
|
||||
degrees: 101
|
||||
});
|
||||
actual = rect.rotate(101, rect.getTopLeft());
|
||||
assertRectangleEquals(expected, actual,
|
||||
"Incorrect rectangle after rotation of 187deg around topLeft.");
|
||||
|
||||
expected = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 1,
|
||||
degrees: 187
|
||||
});
|
||||
actual = rect.rotate(187, rect.getTopLeft());
|
||||
assertRectangleEquals(expected, actual,
|
||||
"Incorrect rectangle after rotation of 187deg around topLeft.");
|
||||
|
||||
expected = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 1,
|
||||
degrees: 300
|
||||
});
|
||||
actual = rect.rotate(300, rect.getTopLeft());
|
||||
assertRectangleEquals(expected, actual,
|
||||
"Incorrect rectangle after rotation of 300deg around topLeft.");
|
||||
});
|
||||
|
||||
test('getBoundingBox', function() {
|
||||
var rect = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: 0,
|
||||
width: 2,
|
||||
height: 3
|
||||
});
|
||||
|
||||
var bb = rect.getBoundingBox();
|
||||
ok(rect.equals(bb), "Bounding box of horizontal rectangle should be " +
|
||||
"identical to rectangle.");
|
||||
|
||||
rect.degrees = 90;
|
||||
var expected = new OpenSeadragon.Rect({
|
||||
x: -3,
|
||||
y: 0,
|
||||
width: 3,
|
||||
height: 2
|
||||
});
|
||||
assertRectangleEquals(expected, rect.getBoundingBox(),
|
||||
"Bounding box of rect rotated 90deg.");
|
||||
|
||||
rect.degrees = 180;
|
||||
var expected = new OpenSeadragon.Rect({
|
||||
x: -2,
|
||||
y: -3,
|
||||
width: 2,
|
||||
height: 3
|
||||
});
|
||||
assertRectangleEquals(expected, rect.getBoundingBox(),
|
||||
"Bounding box of rect rotated 180deg.");
|
||||
|
||||
rect.degrees = 270;
|
||||
var expected = new OpenSeadragon.Rect({
|
||||
x: 0,
|
||||
y: -2,
|
||||
width: 3,
|
||||
height: 2
|
||||
});
|
||||
assertRectangleEquals(expected, rect.getBoundingBox(),
|
||||
"Bounding box of rect rotated 270deg.");
|
||||
});
|
||||
|
||||
})();
|
||||
@ -39,6 +39,7 @@
|
||||
<script src="/test/modules/tilesource.js"></script>
|
||||
<script src="/test/modules/tilesourcecollection.js"></script>
|
||||
<script src="/test/modules/spring.js"></script>
|
||||
<script src="/test/modules/rectangle.js"></script>
|
||||
<!-- The navigator tests are the slowest (for now; hopefully they can be sped up)
|
||||
so we put them last. -->
|
||||
<script src="/test/modules/navigator.js"></script>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user