def add_node_to(self,
model,
source_node=None,
x=0.0,
y=0.0,
length=1.0,
strain=0.0):
if x > model.width or y > model.height:
print("Error: coordinates not in scope", sys.stderr)
elif x < 0 or y < 0:
print("Error: coordinates must be positive", sys.stderr)
elif length < 0 or strain < 0:
print("Error: length and strian must be positive", sys.stderr)
#if this is the first node
elif len(model.G) == 0 and source_node == None:
model.G.add_node(model.node_counter, x=x, y=y)
draw.DrawCommand(model.app)
model.node_counter += 1
#adding attional nodes
elif source_node in model.G.nodes():
new_node = model.node_counter
model.G.add_node(new_node, x=x, y=y)
model.G.add_edge(new_node,
source_node,
length=length,
strain=strain)
draw.DrawCommand(model.app)
model.node_counter += 1
else:
print("Error: source not found", sys.stderr)
def undo(self, model):
model.node_counter -= 1
model.G.remove_node(model.node_counter)
draw.DrawCommand(model.app)