BresenheimLineOfSight

/// @description
var xoCell = x div CellWidth;
var yoCell = y div CellHeight;
var newCircle = scrMidpointCircle(xoCell, yoCell, radius);
var circleLen = array_length(newCircle);

var lay_id_shadows = layer_get_id("ShadowTiles");
var map_id_shadows = layer_tilemap_get_id(lay_id_shadows);

// Обнуляем старые линии видимости
var linesLen = array_length(lineOfSight);
if (linesLen > 0) {
	for (var i = 0; i < linesLen; ++i) {
		var lineLen = array_length(lineOfSight[i]);
		for (var j = 0; j < lineLen; ++j) {
			tilemap_set(map_id_shadows, 1,
			lineOfSight[i][j][0], lineOfSight[i][j][1]);
		}
	}
}

// Строим новые - до точек круга
for (var i = 0; i < circleLen; ++i) {
    var line = scrBresenham(xoCell, yoCell, newCircle[i][0], newCircle[i][1], global.grid);
	var lineLen = array_length(line);
	for (var j = 0; j < lineLen; ++j) {
	    tilemap_set(map_id_shadows, 0, line[j][0], line[j][1]);
	}
	array_push(lineOfSight, line);
}

// Обновляем наш круг
circleSight = [];
array_copy(circleSight, 0, newCircle, 0, array_length(newCircle));