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https://github.com/google/blockly.git
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140 lines
3.8 KiB
JavaScript
140 lines
3.8 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2019 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Utility methods for coordinate manipulation.
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* These methods are not specific to Blockly, and could be factored out into
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* a JavaScript framework such as Closure.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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/**
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* @name Blockly.utils.Coordinate
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* @namespace
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*/
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goog.provide('Blockly.utils.Coordinate');
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/**
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* Class for representing coordinates and positions.
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* @param {number} x Left.
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* @param {number} y Top.
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* @struct
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* @constructor
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*/
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Blockly.utils.Coordinate = function(x, y) {
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/**
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* X-value
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* @type {number}
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*/
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this.x = x;
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/**
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* Y-value
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* @type {number}
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*/
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this.y = y;
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};
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/**
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* Compares coordinates for equality.
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* @param {Blockly.utils.Coordinate} a A Coordinate.
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* @param {Blockly.utils.Coordinate} b A Coordinate.
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* @return {boolean} True iff the coordinates are equal, or if both are null.
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*/
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Blockly.utils.Coordinate.equals = function(a, b) {
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if (a == b) {
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return true;
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}
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if (!a || !b) {
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return false;
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}
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return a.x == b.x && a.y == b.y;
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};
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/**
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* Returns the distance between two coordinates.
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* @param {!Blockly.utils.Coordinate} a A Coordinate.
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* @param {!Blockly.utils.Coordinate} b A Coordinate.
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* @return {number} The distance between `a` and `b`.
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*/
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Blockly.utils.Coordinate.distance = function(a, b) {
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var dx = a.x - b.x;
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var dy = a.y - b.y;
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return Math.sqrt(dx * dx + dy * dy);
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};
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/**
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* Returns the magnitude of a coordinate.
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* @param {!Blockly.utils.Coordinate} a A Coordinate.
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* @return {number} The distance between the origin and `a`.
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*/
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Blockly.utils.Coordinate.magnitude = function(a) {
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return Math.sqrt(a.x * a.x + a.y * a.y);
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};
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/**
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* Returns the difference between two coordinates as a new
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* Blockly.utils.Coordinate.
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* @param {!Blockly.utils.Coordinate} a A Coordinate.
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* @param {!Blockly.utils.Coordinate} b A Coordinate.
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* @return {!Blockly.utils.Coordinate} A Coordinate representing the difference
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* between `a` and `b`.
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*/
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Blockly.utils.Coordinate.difference = function(a, b) {
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return new Blockly.utils.Coordinate(a.x - b.x, a.y - b.y);
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};
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/**
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* Returns the sum of two coordinates as a new Blockly.utils.Coordinate.
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* @param {!Blockly.utils.Coordinate} a A Coordinate.
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* @param {!Blockly.utils.Coordinate} b A Coordinate.
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* @return {!Blockly.utils.Coordinate} A Coordinate representing the sum of the two
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* coordinates.
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*/
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Blockly.utils.Coordinate.sum = function(a, b) {
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return new Blockly.utils.Coordinate(a.x + b.x, a.y + b.y);
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};
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/**
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* Scales this coordinate by the given scale factor.
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* @param {number} s The scale factor to use for both x and y dimensions.
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* @return {!Blockly.utils.Coordinate} This coordinate after scaling.
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*/
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Blockly.utils.Coordinate.prototype.scale = function(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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/**
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* Translates this coordinate by the given offsets.
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* respectively.
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* @param {number} tx The value to translate x by.
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* @param {number} ty The value to translate y by.
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* @return {!Blockly.utils.Coordinate} This coordinate after translating.
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*/
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Blockly.utils.Coordinate.prototype.translate = function(tx, ty) {
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this.x += tx;
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this.y += ty;
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return this;
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};
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