var HorizontalCenterNears = set{
"center-left": {},
"center-right": {},
}
var NonCenterNears = set{
"top-left": {},
"top-right": {},
"bottom-left": {},
"bottom-right": {},
}
var VerticalCenterNears = set{
"top-center": {},
"bottom-center": {},
}
func Layout(ctx context.Context, g *d2graph.Graph, constantNearGraphs []*d2graph.Graph) error
Layout finds the shapes which are assigned constant near keywords and places them.