diff --git a/core/utils/svg_paths.js b/core/utils/svg_paths.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2019 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Methods for creating parts of SVG path strings.  See
+ * developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths
+ * @author fenichel@google.com (Rachel Fenichel)
+ */
+'use strict';
+
+/**
+ * @name Blockly.utils.Paths
+ * @namespace
+ */
+goog.provide('Blockly.utils.Paths');
+
+
+/**
+ * Create a string representing the given x, y pair.  It does not matter whether
+ * the coordinate is relative or absolute.  The result has leading
+ * and trailing spaces, and separates the x and y coordinates with a comma but
+ * no space.
+ * @param {number} x The x coordinate.
+ * @param {number} y The y coordinate.
+ * @return {string} A string of the format ' x,y '
+ * @public
+ */
+Blockly.utils.Paths.point = function(x, y) {
+  return ' ' + x + ',' + y + ' ';
+};
+
+/**
+ * Draw a curbic or quadratic curve.  See
+ * developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d#Cubic_B%C3%A9zier_Curve
+ * These coordinates are unitless and hence in the user coordinate system.
+ * @param {string} command The command to use.
+ *     Should be one of: c, C, s, S, q, Q.
+ * @param {string} points  An array containing all of the points to pass to the
+ *     curve command, in order.  The points are represented as strings of the
+ *     format ' x, y '.
+ * @return {string} A string defining one or more Bezier curves.  See the MDN
+ *     documentation for exact format.
+ * @public
+ */
+Blockly.utils.Paths.curve = function(command, points) {
+  return ' ' + command + points.join('');
+};
+
+/**
+ * Move the cursor to the given position without drawing a line.
+ * The coordinates are absolute.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths#Line_commands
+ * @param {number} x The absolute x coordinate.
+ * @param {number} y The absolute y coordinate.
+ * @return {string} A string of the format ' M x,y '
+ * @public
+ */
+Blockly.utils.Paths.moveTo = function(x, y) {
+  return ' M ' + x + ',' + y + ' ';
+};
+
+/**
+ * Move the cursor to the given position without drawing a line.
+ * Coordinates are relative.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths#Line_commands
+ * @param {number} dx The relative x coordinate.
+ * @param {number} dy The relative y coordinate.
+ * @return {string} A string of the format ' m dx,dy '
+ * @public
+ */
+Blockly.utils.Paths.moveBy = function(dx, dy) {
+  return ' m ' + dx + ',' + dy + ' ';
+};
+
+/**
+ * Draw a line from the current point to the end point, which is the current
+ * point shifted by dx along the x-axis and dy along the y-axis.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths#Line_commands
+ * @param {number} dx The relative x coordinate.
+ * @param {number} dy The relative y coordinate.
+ * @return {string} A string of the format ' l dx,dy '
+ * @public
+ */
+Blockly.utils.Paths.lineTo = function(dx, dy) {
+  return ' l ' + dx + ',' + dy + ' ';
+};
+
+/**
+ * Draw multiple lines connecting all of the given points in order.  This is
+ * equivalent to a series of 'l' commands.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths#Line_commands
+ * @param {!Array.<string>} points An array containing all of the points to
+ *     draw lines to, in order.  The points are represented as strings of the
+ *     format ' dx,dy '.
+ * @return {string} A string of the format ' l (dx,dy)+ '
+ * @public
+ */
+Blockly.utils.Paths.line = function(points) {
+  return ' l' + points.join('');
+};
+
+/**
+ * Draw a horizontal or vertical line.
+ * The first argument specifies the direction and whether the given position is
+ * relative or absolute.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d#LineTo_path_commands
+ * @param {string} command The command to prepend to the coordinate.  This
+ *     should be one of: V, v, H, h.
+ * @param {number} val The coordinate to pass to the command.  It may be
+ *     absolute or relative.
+ * @return {string} A string of the format ' command val '
+ * @public
+ */
+Blockly.utils.Paths.lineOnAxis = function(command, val) {
+  return ' ' + command + ' ' + val + ' ';
+};
+
+/**
+ * Draw an elliptical arc curve.
+ * These coordinates are unitless and hence in the user coordinate system.
+ * See developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d#Elliptical_Arc_Curve
+ * @param {string} command The command string.  Either 'a' or 'A'.
+ * @param {string} flags The flag string.  See the MDN documentation for a
+ *     description and examples.
+ * @param {number} radius The radius of the arc to draw.
+ * @param {string} point The point to move the cursor to after drawing the arc,
+ *     specified either in absolute or relative coordinates depending on the
+ *     command.
+ * @return {string} A string of the format 'command radius radius flags point'
+ * @public
+ */
+Blockly.utils.Paths.arc = function(command, flags, radius, point) {
+  return command + ' ' + radius + ' ' + radius + ' ' + flags + point;
+};