Pixel-Composer/scripts/node_align_functions/node_align_functions.gml

function node_halign(nodeList, alignment = fa_center) {
	var amo = array_length(nodeList);
	
	switch(alignment) {
		case fa_left: 
			var x0 = 999999;
			for( var i = 0; i < amo; i++ )
				x0 = min(x0, nodeList[i].x);
				
			for( var i = 0; i < amo; i++ )
				nodeList[i].x = x0;
			break;
		case fa_center: 
			var xc = 0;
			for( var i = 0; i < amo; i++ )
				xc += nodeList[i].x + nodeList[i].w / 2;
			xc /= amo;
			
			for( var i = 0; i < amo; i++ )
				nodeList[i].x = xc - nodeList[i].w / 2;
			break;
		case fa_right: 
			var x0 = -999999;
			for( var i = 0; i < amo; i++ )
				x0 = max(x0, nodeList[i].x + nodeList[i].w);
				
			for( var i = 0; i < amo; i++ )
				nodeList[i].x = x0 - nodeList[i].w;
			break;
	}
}

function node_valign(nodeList, alignment = fa_middle) {
	var amo = array_length(nodeList);
	
	switch(alignment) {
		case fa_top: 
			var y0 = 999999;
			for( var i = 0; i < amo; i++ )
				y0 = min(y0, nodeList[i].y);
				
			for( var i = 0; i < amo; i++ )
				nodeList[i].y = y0;
			break;
		case fa_middle: 
			var yc = 0;
			for( var i = 0; i < amo; i++ )
				yc += nodeList[i].y + nodeList[i].h / 2;
			yc /= amo;
			
			for( var i = 0; i < amo; i++ )
				nodeList[i].y = yc - nodeList[i].h / 2;
			break;
		case fa_bottom: 
			var y0 = -999999;
			for( var i = 0; i < amo; i++ )
				y0 = max(y0, nodeList[i].y + nodeList[i].h);
				
			for( var i = 0; i < amo; i++ )
				nodeList[i].y = y0 - nodeList[i].h;
			break;
	}
}

function node_hdistribute(nodeList) {
	var amo   = array_length(nodeList);
	var nodes = ds_priority_create();
	
	var x0 =  999999;
	var x1 = -999999;
	for( var i = 0; i < amo; i++ ) {
		var _x = nodeList[i].x + nodeList[i].w / 2;
		x0 = min(x0, _x);
		x1 = max(x1, _x);
		
		ds_priority_add(nodes, nodeList[i], _x);
	}
	
	var sp = (x1 - x0) / (amo - 1);
	
	for( var i = 0; i < amo; i++ ) {
		var _node = ds_priority_delete_min(nodes);
		_node.x = x0 + sp * i - _node.w / 2;
	}
	
	ds_priority_destroy(nodes);
}

function node_vdistribute(nodeList) {
	var amo   = array_length(nodeList);
	var nodes = ds_priority_create();
	
	var y0 =  999999;
	var y1 = -999999;
	for( var i = 0; i < amo; i++ ) {
		var _y = nodeList[i].y + nodeList[i].h / 2;
		y0 = min(y0, _y);
		y1 = max(y1, _y);
		
		ds_priority_add(nodes, nodeList[i], _y);
	}
	
	var sp = (y1 - y0) / (amo - 1);
	
	for( var i = 0; i < amo; i++ ) {
		var _node = ds_priority_delete_min(nodes);
		_node.y = y0 + sp * i - _node.h / 2;
	}
	
	ds_priority_destroy(nodes);
}