random_map.gd

extends Node2D

var width = 32;
var height = 32;
var grass_amount = 300;
var density = 4;
var minlength = 2;
var maxlength = 4;

var grid = [];
var dir = {0:Vector2(0,-1),1:Vector2(-1,0),2:Vector2(1,0),3:Vector2(0,1)}
var curr = Vector2();
var step = Vector2();
var tree = 0;

var river_bed = [];
var river_dir = [Vector2(1,0),Vector2(-1,0),Vector2(0,1)]


func _ready():
	self.set_position(Vector2(800,64))
	for i in range(0,width):
		grid.append([])
		for j in range(0,height):
			grid[i].append(-2)
	for i in range(0,width):
		for j in range(0,height,1):
			if grid[i][j] == -2: get_node("TileMap").set_cell(i,j,1)
			if i == 0 or j == 0 or i == width-1 or j == height-1:
				grid[i][j] = -1
				get_node("TileMap").set_cell(i,j,5) ###Edges
		river_bed.append(Vector2(i,0))
	generate_map(minlength, maxlength, density, grass_amount)
	generate_river_bed()
	pass
	
func grass_tree(curr, dirv, length):
	for i in range(1,length,1):
		if grid[curr.x][curr.y] == -1: return -1
		get_node("TileMap").set_cell(curr.x,curr.y,0)
		tree = tree + 1
		if dirv.x == -1 and dirv.y == 0 and tree > 10: get_node("TileMap").set_cell(curr.x,curr.y,4); tree = 1
		grid[curr.x][curr.y] = -1
		curr = curr + dirv
		

func rand_coord_tile(density):
	step = Vector2(density + rand_range(0,width/density), density + rand_range(0,width/density))
	return step
	
	
func calculation_map(minlength, maxlength, density):
	randomize()
	rand_coord_tile(density)
	if grid[step.x][step.y] == -1: return -1
	var dirr = [0,1,2,3]
	dirr = dirr[randi()%dirr.size()]
	var dirv =dir[dirr]
	var length = rand_range(minlength, maxlength)
	length = length + density + 1
	grass_tree(step, dirv, length)

func generate_map(minlength, maxlength, density, grass_amount):
	for count in range(1,grass_amount,1):
		calculation_map(minlength, maxlength, density)

func generate_river_bed():
	randomize()
	river_bed = river_bed[randi()%river_bed.size()]
	while river_bed.y <= height-1:
		river_bed.x = min(river_bed.x,width-2); river_bed.x = max(river_bed.x,2)
		if grid[river_bed.x][river_bed.y] == -3: river_bed.y = min(river_bed.y+1, height-1)
		get_node("TileMap").set_cell(river_bed.x, river_bed.y,5)
		grid[river_bed.x][river_bed.y] = -3
		var river = river_dir[randi()%river_dir.size()]
		river_bed = river_bed +river