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index.js
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index.js
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/**
* We want to find shortest path between two points in a 2D array
* in this array we have 4 types of tiles:
* 'S' -> starting position
* '0' -> obstacle
* '1' -> valid path
* 'D' -> destination
* 'U' -> not defined tile
* we should have a Tile class, this class will have type, x and y pos
*/
class Type{
static Start = new Type('S')
static Path = new Type('1')
static Obstacle = new Type('0')
static End = new Type('E')
static FinalPath = new Type('F')
constructor(name){
this.name = name
}
getFullName(){
if(this.name === 'S')
return 'Start'
else if(this.name === '1')
return 'Path'
else if(this.name === '0')
return 'Obstacle'
else if(this.name === 'F')
return 'FinalPath'
else
return 'End'
}
toString(){
return this.name
}
}
class Tile{
constructor(xPos, yPos, type){
this.xPos = xPos
this.yPos = yPos
this.type = type
this.visited = false
this.prev = undefined
}
setType(type){
this.type = type
}
getType(){
return this.type
}
setVisited(visited){
this.visited = visited
}
getVisited(){
return this.visited
}
isValidPath(){
return this.type.getFullName() !== 'Obstacle'
}
setPrev(tile){
this.prev = tile
}
getPrev(){
return this.prev
}
toString(){
return this.type.toString()
}
}
class Field{
constructor(width, height){
this.width = width
this.height = height
this.field = Array.from({length: height}, (_, yPos) => Array.from({length: width}, (__, xPos) => new Tile(xPos, yPos, Type.Path)))
this.pathFound = false
}
getWidth(){
return this.width
}
getHeight(){
return this.height
}
printField(){
for(let i = 0; i < this.height; i++){
let row = []
for(let j = 0; j < this.width; j++){
row.push(this.field[i][j].toString())
}
console.log(row.join(" "))
}
}
defineTile(xPos, yPos, type){
if(xPos >= this.width || xPos < 0){
console.log(`INVALID xPos passed to 'Field.defineTile' to set type: ${type.getFullName()}`)
}
else if(yPos >= this.height || yPos < 0){
console.log(`INVALID yPos passed to 'Field.defineTile' to set type: ${type.getFullName()}`)
}
else{
this.field[yPos][xPos].setType(type)
if(type.getFullName() === 'Start'){
this.start = this.field[yPos][xPos]
}
if(type.getFullName() === 'End'){
this.end = this.field[yPos][xPos]
}
}
}
validateField(){
// check if we have start and end tile defined, without them we dont have a path to look for
if(this.start === undefined || this.end === undefined){
Swal.fire({
title: "Error",
text: `Please define ${this.start === undefined ? 'start' : 'end'} tile`,
icon: "error",
confirmButtonText: "Okay",
heightAuto: false
})
return false
}
return true
}
getNeighbours(tile){
let neighbours = []
if(tile.yPos + 1 < this.height && !this.field[tile.yPos + 1][tile.xPos].getVisited() && this.field[tile.yPos + 1][tile.xPos].isValidPath())
neighbours.push(this.field[tile.yPos + 1][tile.xPos])
if(tile.yPos - 1 >= 0 && !this.field[tile.yPos - 1][tile.xPos].getVisited() && this.field[tile.yPos - 1][tile.xPos].isValidPath())
neighbours.push(this.field[tile.yPos - 1][tile.xPos])
if(tile.xPos + 1 < this.width && !this.field[tile.yPos][tile.xPos + 1].getVisited() && this.field[tile.yPos][tile.xPos + 1].isValidPath())
neighbours.push(this.field[tile.yPos][tile.xPos + 1])
if(tile.xPos - 1 >= 0 && !this.field[tile.yPos][tile.xPos - 1].getVisited() && this.field[tile.yPos][tile.xPos - 1].isValidPath())
neighbours.push(this.field[tile.yPos][tile.xPos - 1])
return neighbours
}
clearOldPaths(){
for(let i = 0; i < this.height; i++){
for(let j = 0; j < this.width; j++){
this.field[i][j].setPrev(undefined)
this.field[i][j].setVisited(false)
if(this.field[i][j].getType().getFullName() === 'FinalPath')
this.field[i][j].setType(Type.Path)
}
}
}
findPath(){
if(this.validateField()){
this.clearOldPaths()
this.pathFound = false
let queue = [] // in JS we can use array as queue struct, for that we can use push to add and use shift to remove from the start
queue.push(this.start)
this.start.setVisited(true)
while(queue.length != 0){
let node = queue.shift()
let neighbours = this.getNeighbours(node)
for(let i = 0; i < neighbours.length; i++){
let neighbour = neighbours[i]
queue.push(neighbour)
neighbour.setVisited(true)
neighbour.setPrev(node)
if(neighbour.getType().getFullName() === 'End')
this.pathFound = true
}
}
return true
}
return false
}
constructPath(){
if(!this.pathFound){
Swal.fire({
title: "No path found.",
icon: "info",
confirmButtonText: "Okay",
heightAuto: false
})
return false
}
else{
let node = this.end.prev
while(node.getType().getFullName() !== 'Start'){
node.setType(Type.FinalPath)
node = node.prev
}
return true
}
}
generateHtml(){
let container = document.getElementById("field")
container.innerHTML = ""
for(let i = 0; i < this.height; i++){
let row = document.createElement("div")
row.setAttribute("class", "field-row")
for(let j = 0; j < this.width; j++){
let tile = document.createElement("span")
tile.setAttribute("class", `tile ${this.field[i][j].getType().getFullName().toLowerCase()}`)
tile.setAttribute("id", `row=${i}col=${j}`)
tile.addEventListener("click", () => this.changeTileType(j, i))
row.appendChild(tile)
}
container.appendChild(row)
}
}
changeTileType(xPos, yPos, reset){
let id = `row=${yPos}col=${xPos}`
let tile = document.getElementById(id)
let tileType = tile.getAttribute("class").split(" ")[1]
if(tileType === window.setTileType.getFullName().toLowerCase() || reset){
if(window.setTileType.getFullName().toLowerCase() === 'start'){
this.start = undefined
}
if( window.setTileType.getFullName().toLowerCase() === 'end'){
this.end = undefined
}
tile.setAttribute("class", 'tile path')
this.defineTile(xPos, yPos, Type.Path)
}
else{
if((window.setTileType.getFullName().toLowerCase() === 'start' && this.start === undefined) ||
(window.setTileType.getFullName().toLowerCase() === 'end' && this.end === undefined) ||
(window.setTileType.getFullName().toLowerCase() !== 'start' && window.setTileType.getFullName().toLowerCase() !== 'end')){
tile.setAttribute("class", `tile ${window.setTileType.getFullName().toLowerCase()}`)
this.defineTile(xPos, yPos, window.setTileType)
}
}
}
findAndConstructPathHTML(){
if(this.findPath()){
this.constructPath()
}
this.generateHtml()
}
}
window.field = undefined // global object goes brrrrrrrrrrrrrrrrrrrrr
window.setTileType = Type.Obstacle
function createField(){
let width = Number(document.getElementById("width-input").value)
let height = Number(document.getElementById("height-input").value)
if(width <= 0 || height <= 0){
let invalid = width <= 0 ? 'width' : 'height'
Swal.fire({
title: "Error!",
text: `Invalid ${invalid}! Enter valid ${invalid}.`,
icon: "error",
confirmButtonText: "Okay",
heightAuto: false
})
}
else{
window.field = new Field(width, height)
window.field.generateHtml()
document.getElementsByClassName("field-container")[0].style.display = "flex"
document.getElementsByClassName("begin-settings-wrapper")[0].style.display = "none"
document.getElementById("set-start-button").addEventListener("click", () => window.setTileType = Type.Start)
document.getElementById("set-end-button").addEventListener("click", () => window.setTileType = Type.End)
document.getElementById("set-obstacle-button").addEventListener("click", () => window.setTileType = Type.Obstacle)
document.getElementById("start-search-button").addEventListener("click", () => window.field.findAndConstructPathHTML())
document.getElementById("restart-field-button").addEventListener("click", () => {
window.field = new Field(window.field.getWidth(), window.field.getHeight())
window.field.generateHtml()
})
}
}
// set listener for settings send button
document.getElementById("settings-button").addEventListener("click", createField)