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{"version":3,"file":"shapes.min.js","sources":["../src/shapes.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/* eslint max-depth: [\"error\", 8] */\n\n/**\n * Library of classes for handling simple shapes.\n *\n * These classes can represent shapes, let you alter them, can go to and from a string\n * representation, and can give you an SVG representation.\n *\n * @module qtype_ddmarker/shapes\n * @copyright 2018 The Open University\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\ndefine(function() {\n\n \"use strict\";\n\n /**\n * A point, with x and y coordinates.\n *\n * @param {int} x centre X.\n * @param {int} y centre Y.\n * @constructor\n */\n function Point(x, y) {\n this.x = x;\n this.y = y;\n }\n\n /**\n * Standard toString method.\n * @returns {string} \"x;y\";\n */\n Point.prototype.toString = function() {\n return this.x + ',' + this.y;\n };\n\n /**\n * Move a point\n * @param {int} dx x offset\n * @param {int} dy y offset\n */\n Point.prototype.move = function(dx, dy) {\n this.x += dx;\n this.y += dy;\n };\n\n /**\n * Return a new point that is a certain position relative to this one.\n *\n * @param {(int|Point)} offsetX if a point, offset by this points coordinates, else and int x offset.\n * @param {int} [offsetY] used if offsetX is an int, the corresponding y offset.\n * @return {Point} the new point.\n */\n Point.prototype.offset = function(offsetX, offsetY) {\n if (offsetX instanceof Point) {\n offsetY = offsetX.y;\n offsetX = offsetX.x;\n }\n return new Point(this.x + offsetX, this.y + offsetY);\n };\n\n /**\n * Make a point from the string representation.\n *\n * @param {String} coordinates \"x,y\".\n * @return {Point} the point. Throws an exception if input is not valid.\n */\n Point.parse = function(coordinates) {\n var bits = coordinates.split(',');\n if (bits.length !== 2) {\n throw new Error(coordinates + ' is not a valid point');\n }\n return new Point(Math.round(bits[0]), Math.round(bits[1]));\n };\n\n\n /**\n * Shape constructor. Abstract class to represent the different types of drop zone shapes.\n *\n * @param {String}[label] name of this area.\n * @param {int} [x] centre X.\n * @param {int} [y] centre Y.\n * @constructor\n */\n function Shape(label, x, y) {\n this.label = label;\n this.centre = new Point(x || 0, y || 0);\n }\n\n /**\n * Get the type of shape.\n *\n * @return {String} 'circle', 'rectangle' or 'polygon';\n */\n Shape.prototype.getType = function() {\n throw new Error('Not implemented.');\n };\n\n /**\n * Get the string representation of this shape.\n *\n * @return {String} coordinates as they need to be typed into the form.\n */\n Shape.prototype.getCoordinates = function() {\n throw new Error('Not implemented.');\n };\n\n /**\n * Update the shape from the string representation.\n *\n * @param {String} coordinates in the form returned by getCoordinates.\n * @param {number} ratio Ratio to scale.\n * @return {boolean} true if the string could be parsed and the shape updated, else false.\n */\n Shape.prototype.parse = function(coordinates, ratio) {\n void (coordinates, ratio);\n throw new Error('Not implemented.');\n };\n\n /**\n * Move the entire shape by this offset.\n *\n * @param {int} dx x offset.\n * @param {int} dy y offset.\n * @param {int} maxX ensure that after editing, the shape lies between 0 and maxX on the x-axis.\n * @param {int} maxY ensure that after editing, the shape lies between 0 and maxX on the y-axis.\n */\n Shape.prototype.move = function(dx, dy, maxX, maxY) {\n void (maxY);\n };\n\n /**\n * Move one of the edit handles by this offset.\n *\n * @param {int} handleIndex which handle was moved.\n * @param {int} dx x offset.\n * @param {int} dy y offset.\n * @param {int} maxX ensure that after editing, the shape lies between 0 and maxX on the x-axis.\n * @param {int} maxY ensure that after editing, the shape lies between 0 and maxX on the y-axis.\n */\n Shape.prototype.edit = function(handleIndex, dx, dy, maxX, maxY) {\n void (maxY);\n };\n\n /**\n * Update the properties of this shape after a sequence of edits.\n *\n * For example make sure the circle radius is positive, of the polygon centre is centred.\n */\n Shape.prototype.normalizeShape = function() {\n void (1); // To make CiBoT happy.\n };\n\n /**\n * Get the string representation of this shape.\n *\n * @param {SVGElement} svg the SVG graphic to add this shape to.\n * @return {SVGElement} SVG representation of this shape.\n */\n Shape.prototype.makeSvg = function(svg) {\n void (svg);\n throw new Error('Not implemented.');\n };\n\n /**\n * Update the SVG representation of this shape.\n *\n * @param {SVGElement} svgEl the SVG representation of this shape.\n */\n Shape.prototype.updateSvg = function(svgEl) {\n void (svgEl);\n };\n\n /**\n * Make a circle similar to this shape.\n *\n *@return {Circle} a circle that is about the same size and position as this shape.\n */\n Shape.prototype.makeSimilarCircle = function() {\n throw new Error('Not implemented.');\n };\n\n /**\n * Make a rectangle similar to this shape.\n *\n * @return {Rectangle} a rectangle that is about the same size and position as this shape.\n */\n Shape.prototype.makeSimilarRectangle = function() {\n throw new Error('Not implemented.');\n };\n\n /**\n * Make a polygon similar to this shape.\n *\n * @return {Polygon} a polygon that is about the same size and position as this shape.\n */\n Shape.prototype.makeSimilarPolygon = function() {\n throw new Error('Not implemented.');\n };\n\n /**\n * Get the handles that should be offered to edit this shape, or null if not appropriate.\n *\n * @return {Object[]} with properties moveHandle {Point} and editHandles {Point[]}\n */\n Shape.prototype.getHandlePositions = function() {\n return null;\n };\n\n\n /**\n * A shape that is a circle.\n *\n * @param {String} label name of this area.\n * @param {int} [x] centre X.\n * @param {int} [y] centre Y.\n * @param {int} [radius] radius.\n * @constructor\n */\n function Circle(label, x, y, radius) {\n x = x || 15;\n y = y || 15;\n Shape.call(this, label, x, y);\n this.radius = radius || 15;\n }\n Circle.prototype = new Shape();\n\n Circle.prototype.getType = function() {\n return 'circle';\n };\n\n Circle.prototype.getCoordinates = function() {\n return this.centre + ';' + Math.abs(this.radius);\n };\n\n Circle.prototype.makeSvg = function(svg) {\n var svgEl = createSvgShapeGroup(svg, 'circle');\n this.updateSvg(svgEl);\n return svgEl;\n };\n\n Circle.prototype.updateSvg = function(svgEl) {\n svgEl.childNodes[0].setAttribute('cx', this.centre.x);\n svgEl.childNodes[0].setAttribute('cy', this.centre.y);\n svgEl.childNodes[0].setAttribute('r', Math.abs(this.radius));\n svgEl.childNodes[1].setAttribute('x', this.centre.x);\n svgEl.childNodes[1].setAttribute('y', this.centre.y + 15);\n svgEl.childNodes[1].textContent = this.label;\n };\n\n Circle.prototype.parse = function(coordinates, ratio) {\n if (!coordinates.match(/^\\d+(\\.\\d+)?,\\d+(\\.\\d+)?;\\d+(\\.\\d+)?$/)) {\n return false;\n }\n\n var bits = coordinates.split(';');\n this.centre = Point.parse(bits[0]);\n this.centre.x = this.centre.x * parseFloat(ratio);\n this.centre.y = this.centre.y * parseFloat(ratio);\n this.radius = Math.round(bits[1]) * parseFloat(ratio);\n return true;\n };\n\n Circle.prototype.move = function(dx, dy, maxX, maxY) {\n this.centre.move(dx, dy);\n if (this.centre.x < this.radius) {\n this.centre.x = this.radius;\n }\n if (this.centre.x > maxX - this.radius) {\nthis.centre.x = maxX - this.radius;\n }\n if (this.centre.y < this.radius) {\n this.centre.y = this.radius;\n }\n if (this.centre.y > maxY - this.radius) {\n this.centre.y = maxY - this.radius;\n }\n };\n\n Circle.prototype.edit = function(handleIndex, dx, dy, maxX, maxY) {\n this.radius += dx;\n var limit = Math.min(this.centre.x, this.centre.y, maxX - this.centre.x, maxY - this.centre.y);\n if (this.radius > limit) {\n this.radius = limit;\n }\n if (this.radius < -limit) {\n this.radius = -limit;\n }\n };\n\n /**\n * Update the properties of this shape after a sequence of edits.\n *\n * For example make sure the circle radius is positive, of the polygon centre is centred.\n */\n Circle.prototype.normalizeShape = function() {\n this.radius = Math.abs(this.radius);\n };\n\n Circle.prototype.makeSimilarRectangle = function() {\n return new Rectangle(this.label,\n this.centre.x - this.radius, this.centre.y - this.radius,\n this.radius * 2, this.radius * 2);\n };\n\n Circle.prototype.makeSimilarPolygon = function() {\n // We make a similar square, so if you go to and from Rectangle afterwards, it is loss-less.\n return new Polygon(this.label, [\n this.centre.offset(-this.radius, -this.radius), this.centre.offset(-this.radius, this.radius),\n this.centre.offset(this.radius, this.radius), this.centre.offset(this.radius, -this.radius)]);\n };\n\n Circle.prototype.getHandlePositions = function() {\n return {\n moveHandle: this.centre,\n editHandles: [this.centre.offset(this.radius, 0)]\n };\n };\n\n\n /**\n * A shape that is a rectangle.\n *\n * @param {String} label name of this area.\n * @param {int} [x] top left X.\n * @param {int} [y] top left Y.\n * @param {int} [width] width.\n * @param{int} [height] height.\n * @constructor\n */\n function Rectangle(label, x, y, width, height) {\n Shape.call(this, label, x, y);\n this.width = width || 30;\n this.height = height || 30;\n }\n Rectangle.prototype = new Shape();\n\n Rectangle.prototype.getType = function() {\n return 'rectangle';\n };\n\n Rectangle.prototype.getCoordinates = function() {\n return this.centre + ';' + this.width + ',' + this.height;\n };\n\n Rectangle.prototype.makeSvg = function(svg) {\n var svgEl = createSvgShapeGroup(svg, 'rect');\n this.updateSvg(svgEl);\n return svgEl;\n };\n\n Rectangle.prototype.updateSvg = function(svgEl) {\n if (this.width >= 0) {\n svgEl.childNodes[0].setAttribute('x', this.centre.x);\n svgEl.childNodes[0].setAttribute('width', this.width);\n } else {\n svgEl.childNodes[0].setAttribute('x', this.centre.x + this.width);\n svgEl.childNodes[0].setAttribute('width', -this.width);\n }\n if (this.height >= 0) {\n svgEl.childNodes[0].setAttribute('y', this.centre.y);\n svgEl.childNodes[0].setAttribute('height', this.height);\n } else {\n svgEl.childNodes[0].setAttribute('y', this.centre.y + this.height);\n svgEl.childNodes[0].setAttribute('height', -this.height);\n }\n\n svgEl.childNodes[1].setAttribute('x', this.centre.x + this.width / 2);\n svgEl.childNodes[1].setAttribute('y', this.centre.y + this.height / 2 + 15);\n svgEl.childNodes[1].textContent = this.label;\n };\n\n Rectangle.prototype.parse = function(coordinates, ratio) {\n if (!coordinates.match(/^\\d+(\\.\\d+)?,\\d+(\\.\\d+)?;\\d+(\\.\\d+)?,\\d+(\\.\\d+)?$/)) {\n return false;\n }\n\n var bits = coordinates.split(';');\n this.centre = Point.parse(bits[0]);\n this.centre.x = this.centre.x * parseFloat(ratio);\n this.centre.y = this.centre.y * parseFloat(ratio);\n var size = Point.parse(bits[1]);\n this.width = size.x * parseFloat(ratio);\n this.height = size.y * parseFloat(ratio);\n return true;\n };\n\n Rectangle.prototype.move = function(dx, dy, maxX, maxY) {\n this.centre.move(dx, dy);\n if (this.centre.x < 0) {\n this.centre.x = 0;\n }\n if (this.centre.x > maxX - this.width) {\n this.centre.x = maxX - this.width;\n }\n if (this.centre.y < 0) {\n this.centre.y = 0;\n }\n if (this.centre.y > maxY - this.height) {\n this.centre.y = maxY - this.height;\n }\n };\n\n Rectangle.prototype.edit = function(handleIndex, dx, dy, maxX, maxY) {\n this.width += dx;\n this.height += dy;\n if (this.width < -this.centre.x) {\n this.width = -this.centre.x;\n }\n if (this.width > maxX - this.centre.x) {\n this.width = maxX - this.centre.x;\n }\n if (this.height < -this.centre.y) {\n this.height = -this.centre.y;\n }\n if (this.height > maxY - this.centre.y) {\n this.height = maxY - this.centre.y;\n }\n };\n\n /**\n * Update the properties of this shape after a sequence of edits.\n *\n * For example make sure the circle radius is positive, of the polygon centre is centred.\n */\n Rectangle.prototype.normalizeShape = function() {\n if (this.width < 0) {\n this.centre.x += this.width;\n this.width = -this.width;\n }\n if (this.height < 0) {\n this.centre.y += this.height;\n this.height = -this.height;\n }\n };\n\n Rectangle.prototype.makeSimilarCircle = function() {\n return new Circle(this.label,\n Math.round(this.centre.x + this.width / 2),\n Math.round(this.centre.y + this.height / 2),\n Math.round((this.width + this.height) / 4));\n };\n\n Rectangle.prototype.makeSimilarPolygon = function() {\n return new Polygon(this.label, [\n this.centre, this.centre.offset(0, this.height),\n this.centre.offset(this.width, this.height), this.centre.offset(this.width, 0)]);\n };\n\n Rectangle.prototype.getHandlePositions = function() {\n return {\n moveHandle: this.centre.offset(this.width / 2, this.height / 2),\n editHandles: [this.centre.offset(this.width, this.height)]\n };\n };\n\n\n /**\n * A shape that is a polygon.\n *\n * @param {String} label name of this area.\n * @param {Point[]} [points] position of the vertices relative to (centreX, centreY).\n * each object in the array should have two\n * @constructor\n */\n function Polygon(label, points) {\n Shape.call(this, label, 0, 0);\n this.points = points ? points.slice() : [new Point(10, 10), new Point(40, 10), new Point(10, 40)];\n this.normalizeShape();\n this.ratio = 1;\n }\n Polygon.prototype = new Shape();\n\n Polygon.prototype.getType = function() {\n return 'polygon';\n };\n\n Polygon.prototype.getCoordinates = function() {\n var coordinates = '';\n for (var i = 0; i < this.points.length; i++) {\n coordinates += this.centre.offset(this.points[i]) + ';';\n }\n return coordinates.slice(0, coordinates.length - 1); // Strip off the last ';'.\n };\n\n Polygon.prototype.makeSvg = function(svg) {\n var svgEl = createSvgShapeGroup(svg, 'polygon');\n this.updateSvg(svgEl);\n return svgEl;\n };\n\n Polygon.prototype.updateSvg = function(svgEl) {\n svgEl.childNodes[0].setAttribute('points', this.getCoordinates().replace(/[,;]/g, ' '));\n svgEl.childNodes[0].setAttribute('transform', 'scale(' + parseFloat(this.ratio) + ')');\n svgEl.childNodes[1].setAttribute('x', this.centre.x);\n svgEl.childNodes[1].setAttribute('y', this.centre.y + 15);\n svgEl.childNodes[1].textContent = this.label;\n };\n\n Polygon.prototype.parse = function(coordinates, ratio) {\n if (!coordinates.match(/^\\d+(\\.\\d+)?,\\d+(\\.\\d+)?(?:;\\d+(\\.\\d+)?,\\d+(\\.\\d+)?)*$/)) {\n return false;\n }\n\n var bits = coordinates.split(';');\n var points = [];\n for (var i = 0; i < bits.length; i++) {\n points.push(Point.parse(bits[i]));\n }\n\n this.points = points;\n this.centre.x = 0;\n this.centre.y = 0;\n this.ratio = ratio;\n this.normalizeShape();\n\n return true;\n };\n\n Polygon.prototype.move = function(dx, dy, maxX, maxY) {\n this.centre.move(dx, dy);\n var bbXMin = maxX,\n bbXMax = 0,\n bbYMin = maxY,\n bbYMax = 0;\n // Computer centre.\n for (var i = 0; i < this.points.length; i++) {\n bbXMin = Math.min(bbXMin, this.points[i].x);\n bbXMax = Math.max(bbXMax, this.points[i].x);\n bbYMin = Math.min(bbYMin, this.points[i].y);\n bbYMax = Math.max(bbYMax, this.points[i].y);\n }\n if (this.centre.x < -bbXMin) {\n this.centre.x = -bbXMin;\n }\n if (this.centre.x > maxX - bbXMax) {\n this.centre.x = maxX - bbXMax;\n }\n if (this.centre.y < -bbYMin) {\n this.centre.y = -bbYMin;\n }\n if (this.centre.y > maxY - bbYMax) {\n this.centre.y = maxY - bbYMax;\n }\n };\n\n Polygon.prototype.edit = function(handleIndex, dx, dy, maxX, maxY) {\n this.points[handleIndex].move(dx, dy);\n if (this.points[handleIndex].x < -this.centre.x) {\n this.points[handleIndex].x = -this.centre.x;\n }\n if (this.points[handleIndex].x > maxX - this.centre.x) {\n this.points[handleIndex].x = maxX - this.centre.x;\n }\n if (this.points[handleIndex].y < -this.centre.y) {\n this.points[handleIndex].y = -this.centre.y;\n }\n if (this.points[handleIndex].y > maxY - this.centre.y) {\n this.points[handleIndex].y = maxY - this.centre.y;\n }\n };\n\n /**\n * Add a new point after the given point, with the same co-ordinates.\n *\n * This does not automatically normalise.\n *\n * @param {int} pointIndex the index of the vertex after which to insert this new one.\n */\n Polygon.prototype.addNewPointAfter = function(pointIndex) {\n this.points.splice(pointIndex, 0,\n new Point(this.points[pointIndex].x, this.points[pointIndex].y));\n };\n\n Polygon.prototype.normalizeShape = function() {\n var i,\n x = 0,\n y = 0;\n\n if (this.points.length === 0) {\n return;\n }\n\n // Computer centre.\n for (i = 0; i < this.points.length; i++) {\n x += this.points[i].x;\n y += this.points[i].y;\n }\n x = Math.round(x / this.points.length);\n y = Math.round(y / this.points.length);\n\n if (x === 0 && y === 0) {\n return;\n }\n\n for (i = 0; i < this.points.length; i++) {\n this.points[i].move(-x, -y);\n }\n this.centre.move(x, y);\n };\n\n Polygon.prototype.makeSimilarCircle = function() {\n return this.makeSimilarRectangle().makeSimilarCircle();\n };\n\n Polygon.prototype.makeSimilarRectangle = function() {\n var p,\n minX = 0,\n maxX = 0,\n minY = 0,\n maxY = 0;\n for (var i = 0; i < this.points.length; i++) {\n p = this.points[i];\n minX = Math.min(minX, p.x);\n maxX = Math.max(maxX, p.x);\n minY = Math.min(minY, p.y);\n maxY = Math.max(maxY, p.y);\n }\n return new Rectangle(this.label,\n this.centre.x + minX, this.centre.y + minY,\n Math.max(maxX - minX, 10), Math.max(maxY - minY, 10));\n };\n\n Polygon.prototype.getHandlePositions = function() {\n var editHandles = [];\n for (var i = 0; i < this.points.length; i++) {\n editHandles.push(this.points[i].offset(this.centre.x, this.centre.y));\n }\n\n this.centre.x = this.centre.x * parseFloat(this.ratio);\n this.centre.y = this.centre.y * parseFloat(this.ratio);\n\n return {\n moveHandle: this.centre,\n editHandles: editHandles\n };\n };\n\n\n /**\n * Not a shape (null object pattern).\n *\n * @param {String} label name of this area.\n * @constructor\n */\n function NullShape(label) {\n Shape.call(this, label);\n }\n NullShape.prototype = new Shape();\n\n NullShape.prototype.getType = function() {\n return 'null';\n };\n\n NullShape.prototype.getCoordinates = function() {\n return '';\n };\n\n NullShape.prototype.makeSvg = function(svg) {\n void (svg);\n return null;\n };\n\n NullShape.prototype.updateSvg = function(svgEl) {\n void (svgEl);\n };\n\n NullShape.prototype.parse = function(coordinates) {\n void (coordinates);\n return false;\n };\n\n NullShape.prototype.makeSimilarCircle = function() {\n return new Circle(this.label);\n };\n\n NullShape.prototype.makeSimilarRectangle = function() {\n return new Rectangle(this.label);\n };\n\n NullShape.prototype.makeSimilarPolygon = function() {\n return new Polygon(this.label);\n };\n\n\n /**\n * Make a new SVG DOM element as a child of svg.\n *\n * @param {SVGElement} svg the parent node.\n * @param {String} tagName the tag name.\n * @return {SVGElement} the newly created node.\n */\n function createSvgElement(svg, tagName) {\n var svgEl = svg.ownerDocument.createElementNS('http://www.w3.org/2000/svg', tagName);\n svg.appendChild(svgEl);\n return svgEl;\n }\n\n /**\n * Make a group SVG DOM elements containing a shape of the given type as first child,\n * and a text label as the second child.\n *\n * @param {SVGElement} svg the parent node.\n * @param {String} tagName the tag name.\n * @return {SVGElement} the newly created g element.\n */\n function createSvgShapeGroup(svg, tagName) {\n var svgEl = createSvgElement(svg, 'g');\n createSvgElement(svgEl, tagName).setAttribute('class', 'shape');\n createSvgElement(svgEl, 'text').setAttribute('class', 'shapeLabel');\n return svgEl;\n }\n\n /**\n * @alias module:qtype_ddmarker/shapes\n */\n return {\n /**\n * A point, with x and y coordinates.\n *\n * @param {int} x centre X.\n * @param {int} y centre Y.\n * @constructor\n */\n Point: Point,\n\n /**\n * A point, with x and y coordinates.\n *\n * @param {int} x centre X.\n * @param {int} y centre Y.\n * @constructor\n */\n Shape: Shape,\n\n /**\n* A shape that is a circle.\n *\n * @param {String} label name of this area.\n * @param {int} [x] centre X.\n * @param {int} [y] centre Y.\n * @param {int} [radius] radius.\n * @constructor\n */\n Circle: Circle,\n\n /**\n * A shape that is a rectangle.\n *\n * @param {String} label name of this area.\n * @param {int} [x] top left X.\n * @param {int} [y] top left Y.\n * @param {int} [width] width.\n * @param {int} [height] height.\n * @constructor\n */\n Rectangle: Rectangle,\n\n /**\n * A shape that is a polygon.\n *\n * @param {String} label name of this area.\n * @param {Point[]} [points] position of the vertices relative to (centreX, centreY).\n * each object in the array should have two\n * @constructor\n */\n Polygon: Polygon,\n\n /**\n * Not a shape (null object pattern).\n *\n * @param {String} label name of this area.\n * @constructor\n */\n NullShape: NullShape,\n\n /**\n * Make a new SVG DOM element as a child of svg.\n *\n * @param {SVGElement} svg the parent node.\n * @param {String} tagName the tag name.\n * @return {SVGElement} the newly created node.\n */\n createSvgElement: createSvgElement,\n\n /**\n * Make a shape of the given type.\n *\n * @param {String} shapeType\n * @param {String} label\n * @return {Shape} the requested shape.\n */\n make: function(shapeType, label) {\n switch (shapeType) {\n case 'circle':\n return new Circle(label);\n case 'rectangle':\n return new Rectangle(label);\n case 'polygon':\n return new Polygon(label);\n default:\nreturn new NullShape(label);\n }\n },\n\n /**\n * Make a shape of the given type that is similar to the shape of the original type.\n *\n * @param {String} shapeType the new type of shape to make\n * @param {Shape} shape the shape to copy\n * @return {Shape} the similar shape of a different type.\n */\n getSimilar: function(shapeType, shape) {\n if (shapeType === shape.getType()) {\n return shape;\n }\n switch (shapeType) {\n case 'circle':\n return shape.makeSimilarCircle();\n case 'rectangle':\n return shape.makeSimilarRectangle();\n case 'polygon':\n return shape.makeSimilarPolygon();\n default:\n return new NullShape(shape.label);\n }\n }\n 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