extends Spatial


var square_grid = preload( "res://ressources/scripts/square_grid.gd" ).new()

export( Vector2 ) var size = Vector2( 512, 512 ) 
export( float ) var cell_size = 1.0
export( String ) var heightmap_filename = "dunes_heightmap.png"
var heightmap_image = null

func _ready():

    self.heightmap_image = Image.new()
    self.heightmap_image.load( "res://assets/decors/terrains/heightmaps/" + self.heightmap_filename )
    square_grid.set_size( self.heightmap_image.get_size() )
    square_grid.cell_size = self.cell_size
    $terrain.mesh.size = self.size

func get_height( p_position ):
      
    var cell = self.square_grid.get_cell_at( p_position )
    var ratio = Vector2( self.heightmap_image.get_size().x/ self.size.x, self.heightmap_image.get_size().y/self.size.y )
    var offset = ( Vector2(self.heightmap_image.get_size().x/2, self.heightmap_image.get_size().y/2 ) )
#    var coords = (Vector2( cell.coords.x, cell.coords.z ) + offset) * ratio

    var coords = (Vector2( cell.coords.x, cell.coords.z )* ratio) +offset
    
    var pixel_coords = (Vector2( p_position.x, p_position.z ) + offset)
    
    
    
    heightmap_image.lock()
#    var pixel = heightmap_image.get_pixel( pixel_coords.x, pixel_coords.y )
    var pixel = heightmap_image.get_pixel( coords.x, coords.y )
    heightmap_image.unlock()
    return pixel.r * 100.0