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DarkratosDarkratos
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‎a_star.js

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var open_set = []
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var closed_set = []
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var end_point
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function calc_heuristics( cur_cell, end_cell )
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{
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return abs( end_cell.x - cur_cell.x ) + abs( end_cell.y - cur_cell.y )
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}
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function a_star( arr )
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{
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current_cell = open_set[ 0 ]
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saved_index = 0
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for ( let i = 0; i < open_set.length; i++ )
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{
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if ( open_set[ i ].f < current_cell.f )
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{
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current_cell = open_set[ i ]
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saved_index = i
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}
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}
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if ( current_cell.x == end_point.x && current_cell.y == end_point.y )
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{
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return current_cell
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}
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closed_set.push( current_cell )
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open_set.splice( saved_index, 1 )
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var cur_neighbours = current_cell.get_neighbours( arr )
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for ( let i = 0; i < cur_neighbours.length; i++ )
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{
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if ( !closed_set.includes( cur_neighbours[ i ] ) )
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{
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var temp_g = current_cell.g + 1;
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var new_path = false;
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if ( open_set.includes( cur_neighbours[ i ] ) ) {
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if ( temp_g < cur_neighbours[ i ].g ) {
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cur_neighbours[ i ].g = temp_g;
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new_path = true;
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}
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}
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else
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{
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cur_neighbours[ i ].g = temp_g;
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new_path = true;
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open_set.push( cur_neighbours[ i ] );
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}
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if ( new_path ) {
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cur_neighbours[ i ].h = calc_heuristics( cur_neighbours[ i ], end_point );
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cur_neighbours[ i ].f = cur_neighbours[ i ].g + cur_neighbours[ i ].h;
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cur_neighbours[ i ].previous = current_cell;
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}
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}
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}
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return current_cell
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}

‎cell.js

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class cell
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{
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constructor( i, j, size )
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{
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this.i = i
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this.j = j
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this.x = i * size
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this.y = j * size
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this.size = size
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this.walls = [ true, true, true, true ] //left, up, right, bottom
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this.visited = false
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this.color = color( 255, 255, 255 )
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this.f = 99999999
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this.g = 99999999
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this.previous = undefined
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this.updated_open = false
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this.updated_closed = false
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}
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set_color( new_color )
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{
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this.color = new_color
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}
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get_neighbours( grid )
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{
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var arr = []
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if ( this.i > 0 && !this.walls[ 0 ] )
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arr.push( grid[ this.i - 1 ][ this.j ] )
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if ( this.j > 0 && !this.walls[ 1 ] )
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arr.push( grid[ this.i ][ this.j - 1 ] )
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if ( this.i < ( width / this.size ) - 1 && !this.walls[ 2 ] )
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arr.push( grid[ this.i + 1 ][ this.j ] )
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if ( this.j < ( height / this.size ) - 1 && !this.walls[ 3 ] )
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arr.push( grid[ this.i ][ this.j + 1 ] )
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return arr
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}
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set_visited( )
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{
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this.visited = true
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}
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is_visited( )
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{
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return this.visited
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}
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remove_wall( delta_x, delta_y )
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{
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if ( delta_x == -1 )
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this.walls[ 0 ] = false
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if ( delta_x == 1 )
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this.walls[ 2 ] = false
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if ( delta_y == -1 )
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this.walls[ 1 ] = false
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if ( delta_y == 1 )
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this.walls[ 3 ] = false
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}
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render( current )
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{
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if ( current.x == this.i && current.y == this.j )
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{
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noStroke( )
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fill( 200, 100, 200 )
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rect( this.x, this.y, this.size, this.size )
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}
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else if ( this.visited )
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{
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noStroke( )
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fill( this.color )
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rect( this.x, this.y, this.size, this.size )
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}
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stroke( 0 )
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strokeWeight( 2 )
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if ( this.walls[ 0 ] )
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line( this.x, this.y, this.x, this.y + this.size )
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if ( this.walls[ 1 ] )
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line( this.x, this.y, this.x + this.size, this.y )
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if ( this.walls[ 2 ] )
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line( this.x + this.size, this.y, this.x + this.size, this.y + this.size )
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if ( this.walls[ 3 ] )
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line( this.x, this.y + this.size, this.x + this.size, this.y + this.size )
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}
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update( current )
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{
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if ( current.x == this.i && current.y == this.j )
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{
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noStroke( )
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fill( 200, 100, 200 )
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rect( this.x, this.y, this.size, this.size )
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}
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else if ( this.visited )
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{
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noStroke( )
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fill( this.color )
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rect( this.x, this.y, this.size, this.size )
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}
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stroke( 0 )
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strokeWeight( 2 )
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if ( this.walls[ 0 ] )
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line( this.x, this.y, this.x, this.y + this.size )
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if ( this.walls[ 1 ] )
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line( this.x, this.y, this.x + this.size, this.y )
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if ( this.walls[ 2 ] )
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line( this.x + this.size, this.y, this.x + this.size, this.y + this.size )
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if ( this.walls[ 3 ] )
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line( this.x, this.y + this.size, this.x + this.size, this.y + this.size )
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}
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}

‎generator.js

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var stack = []
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var current
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var count = 1
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function backtracking( arr )
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{
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if ( count == total_cells )
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return createVector( 0, 0 )
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cur = stack.pop( )
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neighbours = []
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if ( cur.x > 0 )
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if ( !arr[ cur.x - 1 ][ cur.y ].is_visited( ) )
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neighbours.push( createVector( cur.x - 1, cur.y ) )
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if ( cur.x < ( width / cell_size ) - 1 )
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if ( !arr[ cur.x + 1 ][ cur.y ].is_visited( ) )
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neighbours.push( createVector( cur.x + 1, cur.y ) )
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if ( cur.y > 0 )
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if ( !arr[ cur.x ][ cur.y - 1 ].is_visited( ) )
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neighbours.push( createVector( cur.x, cur.y - 1 ) )
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if ( cur.y < ( height / cell_size ) - 1 )
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if ( !arr[ cur.x ][ cur.y + 1 ].is_visited( ) )
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neighbours.push( createVector( cur.x, cur.y + 1 ) )
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if ( neighbours.length )
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{
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stack.push( cur )
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selected = neighbours[ floor( random( neighbours.length ) ) ]
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stack.push( selected )
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arr[ cur.x ][ cur.y ].remove_wall( selected.x - cur.x, selected.y - cur.y )
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arr[ selected.x ][ selected.y ].remove_wall( cur.x - selected.x, cur.y - selected.y )
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arr[ selected.x ][ selected.y ].set_visited( )
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count++
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return selected
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}
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return cur
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}

‎index.html

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<!DOCTYPE html>
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<html dir="ltr" lang="pt-BR">
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<head>
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<meta charset="UTF-8" />
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<title></title>
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<script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/p5.min.js"></script>
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</head>
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<body>
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<script src="main.js"></script>
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<script src="cell.js"></script>
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<script src="generator.js"></script>
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<script src="a_star.js"></script>
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</body>
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</html>

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