TikZ how to make supply and demand arrows for nodes?How to define the default vertical distance between nodes?Changing Size of Arrows, Labels, Loops in Diagrams and Directed GraphsTikZ scaling graphic and adjust node position and keep font sizeNumerical conditional within tikz keys?Half arrows in graph using TikZTikZ: Drawing an arc from an intersection to an intersectionWhy does my arrow head size decrease?Parallel arrows between nodes of varying sizeTransform a shape based on existing coordinatesAdding nodes through a TikZ style, using double dash lines ``--``

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TikZ how to make supply and demand arrows for nodes?

How to define the default vertical distance between nodes?Changing Size of Arrows, Labels, Loops in Diagrams and Directed GraphsTikZ scaling graphic and adjust node position and keep font sizeNumerical conditional within tikz keys?Half arrows in graph using TikZTikZ: Drawing an arc from an intersection to an intersectionWhy does my arrow head size decrease?Parallel arrows between nodes of varying sizeTransform a shape based on existing coordinatesAdding nodes through a TikZ style, using double dash lines ``--``

I have the nodes and arcs modeled in TikZ, but I'm scratching my head about how to draw the 'supply' and 'demand' double arrows (e.g. demand of 2 on node 1, supply of 2 on node 3). Can anybody help? Thanks

what I want

current code, which produces the nodes and arcs (ignoring dashed lines), the demand nodes, but not the double-tailed supply and demand arrows:

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 3.5) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (s3) 2;
 node at (5.0,-1.0) [supplynode] (s4) 6;
 node at (6.0,4.0) [supplynode] (s5) 2;
 node at (11.0,0.0) [supplynode] (s7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);



endtikzpicture
enddocument

what the above code produces:
enter image description here

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

2

Welcome to Stackexchange! According to our guidelines, it would be appreciated to see some MWE to help you based on your current code. Thanks a lot!

– Dave
1 hour ago

with Implies[] from arrows.meta library?

– Zarko
1 hour ago

Thanks @Dave, what is MWE?

– user1757226
1 hour ago

@user1757226 see tex.meta.stackexchange.com/q/228/63847.

– LarrySnyder610
1 hour ago

well, this is only code snippet :-). *mwe*(minimal working example) is complete document beginning with documentclass with needed packages and your definitions in preamble following with document body with your code snippet and with enddocument on the end.

– Zarko
1 hour ago

|
show 1 more comment

what I want

current code, which produces the nodes and arcs (ignoring dashed lines), the demand nodes, but not the double-tailed supply and demand arrows:

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 3.5) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (s3) 2;
 node at (5.0,-1.0) [supplynode] (s4) 6;
 node at (6.0,4.0) [supplynode] (s5) 2;
 node at (11.0,0.0) [supplynode] (s7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);



endtikzpicture
enddocument

what the above code produces:
enter image description here

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

2

Welcome to Stackexchange! According to our guidelines, it would be appreciated to see some MWE to help you based on your current code. Thanks a lot!

– Dave
1 hour ago

with Implies[] from arrows.meta library?

– Zarko
1 hour ago

Thanks @Dave, what is MWE?

– user1757226
1 hour ago

@user1757226 see tex.meta.stackexchange.com/q/228/63847.

– LarrySnyder610
1 hour ago

well, this is only code snippet :-). *mwe*(minimal working example) is complete document beginning with documentclass with needed packages and your definitions in preamble following with document body with your code snippet and with enddocument on the end.

– Zarko
1 hour ago

|
show 1 more comment

what I want

current code, which produces the nodes and arcs (ignoring dashed lines), the demand nodes, but not the double-tailed supply and demand arrows:

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 3.5) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (s3) 2;
 node at (5.0,-1.0) [supplynode] (s4) 6;
 node at (6.0,4.0) [supplynode] (s5) 2;
 node at (11.0,0.0) [supplynode] (s7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);



endtikzpicture
enddocument

what the above code produces:
enter image description here

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

what I want

current code, which produces the nodes and arcs (ignoring dashed lines), the demand nodes, but not the double-tailed supply and demand arrows:

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 3.5) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (s3) 2;
 node at (5.0,-1.0) [supplynode] (s4) 6;
 node at (6.0,4.0) [supplynode] (s5) 2;
 node at (11.0,0.0) [supplynode] (s7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);



endtikzpicture
enddocument

what the above code produces:
enter image description here

tikz-pgf

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

edited 44 mins ago

asked 1 hour ago

user1757226

263

New contributor

asked 1 hour ago

user1757226

263

asked 1 hour ago

user1757226

263

New contributor

user1757226 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

2

Welcome to Stackexchange! According to our guidelines, it would be appreciated to see some MWE to help you based on your current code. Thanks a lot!

– Dave
1 hour ago

with Implies[] from arrows.meta library?

– Zarko
1 hour ago

Thanks @Dave, what is MWE?

– user1757226
1 hour ago

@user1757226 see tex.meta.stackexchange.com/q/228/63847.

– LarrySnyder610
1 hour ago

well, this is only code snippet :-). *mwe*(minimal working example) is complete document beginning with documentclass with needed packages and your definitions in preamble following with document body with your code snippet and with enddocument on the end.

– Zarko
1 hour ago

|
show 1 more comment

2

Welcome to Stackexchange! According to our guidelines, it would be appreciated to see some MWE to help you based on your current code. Thanks a lot!

– Dave
1 hour ago

with Implies[] from arrows.meta library?

– Zarko
1 hour ago

Thanks @Dave, what is MWE?

– user1757226
1 hour ago

@user1757226 see tex.meta.stackexchange.com/q/228/63847.

– LarrySnyder610
1 hour ago

well, this is only code snippet :-). *mwe*(minimal working example) is complete document beginning with documentclass with needed packages and your definitions in preamble following with document body with your code snippet and with enddocument on the end.

– Zarko
1 hour ago

Welcome to Stackexchange! According to our guidelines, it would be appreciated to see some MWE to help you based on your current code. Thanks a lot!

– Dave
1 hour ago

with Implies[] from arrows.meta library?

– Zarko
1 hour ago

Thanks @Dave, what is MWE?

– user1757226
1 hour ago

@user1757226 see tex.meta.stackexchange.com/q/228/63847.

– LarrySnyder610
1 hour ago

well, this is only code snippet :-). *mwe*(minimal working example) is complete document beginning with documentclass with needed packages and your definitions in preamble following with document body with your code snippet and with enddocument on the end.

– Zarko
1 hour ago

|
show 1 more comment

1 Answer
1

active

oldest

votes

OK, I'm sure there's a better way to organize things inside the Tikz, but I have found a sufficient answer to my question myself. Posting here for posterity.

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning, arrows.meta

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle ,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 4.0) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (d3) 2;
 node at (5.0,-1.5) [supplynode] (s4) 6;
 node at (6.5,4.0) [supplynode] (d5) 2;
 node at (11.5,0.0) [supplynode] (d7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);

 draw[-Implies,line width=1pt,double distance=2pt] (n1) -- (s1);
 draw[-Implies,line width=1pt,double distance=2pt] (n2) -- (s2);
 draw[-Implies,line width=1pt,double distance=2pt] (d3) -- (n3);
 draw[-Implies,line width=1pt,double distance=2pt] (n4) -- (s4);
 draw[-Implies,line width=1pt,double distance=2pt] (d5) -- (n5);
 draw[-Implies,line width=1pt,double distance=2pt] (d7) -- (n7);
endtikzpicture
enddocument

produces this, which is sufficient for my needs. Thanks @Zarko for the tip.
enter image description here

answered 25 mins ago

user1757226

263

New contributor

add a comment |

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1 Answer
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1 Answer
1

active

oldest

votes

OK, I'm sure there's a better way to organize things inside the Tikz, but I have found a sufficient answer to my question myself. Posting here for posterity.

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning, arrows.meta

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle ,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 4.0) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (d3) 2;
 node at (5.0,-1.5) [supplynode] (s4) 6;
 node at (6.5,4.0) [supplynode] (d5) 2;
 node at (11.5,0.0) [supplynode] (d7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);

 draw[-Implies,line width=1pt,double distance=2pt] (n1) -- (s1);
 draw[-Implies,line width=1pt,double distance=2pt] (n2) -- (s2);
 draw[-Implies,line width=1pt,double distance=2pt] (d3) -- (n3);
 draw[-Implies,line width=1pt,double distance=2pt] (n4) -- (s4);
 draw[-Implies,line width=1pt,double distance=2pt] (d5) -- (n5);
 draw[-Implies,line width=1pt,double distance=2pt] (d7) -- (n7);
endtikzpicture
enddocument

produces this, which is sufficient for my needs. Thanks @Zarko for the tip.
enter image description here

answered 25 mins ago

user1757226

263

New contributor

add a comment |

OK, I'm sure there's a better way to organize things inside the Tikz, but I have found a sufficient answer to my question myself. Posting here for posterity.

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning, arrows.meta

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle ,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 4.0) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (d3) 2;
 node at (5.0,-1.5) [supplynode] (s4) 6;
 node at (6.5,4.0) [supplynode] (d5) 2;
 node at (11.5,0.0) [supplynode] (d7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);

 draw[-Implies,line width=1pt,double distance=2pt] (n1) -- (s1);
 draw[-Implies,line width=1pt,double distance=2pt] (n2) -- (s2);
 draw[-Implies,line width=1pt,double distance=2pt] (d3) -- (n3);
 draw[-Implies,line width=1pt,double distance=2pt] (n4) -- (s4);
 draw[-Implies,line width=1pt,double distance=2pt] (d5) -- (n5);
 draw[-Implies,line width=1pt,double distance=2pt] (d7) -- (n7);
endtikzpicture
enddocument

produces this, which is sufficient for my needs. Thanks @Zarko for the tip.
enter image description here

answered 25 mins ago

user1757226

263

New contributor

add a comment |

OK, I'm sure there's a better way to organize things inside the Tikz, but I have found a sufficient answer to my question myself. Posting here for posterity.

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning, arrows.meta

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle ,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 4.0) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (d3) 2;
 node at (5.0,-1.5) [supplynode] (s4) 6;
 node at (6.5,4.0) [supplynode] (d5) 2;
 node at (11.5,0.0) [supplynode] (d7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);

 draw[-Implies,line width=1pt,double distance=2pt] (n1) -- (s1);
 draw[-Implies,line width=1pt,double distance=2pt] (n2) -- (s2);
 draw[-Implies,line width=1pt,double distance=2pt] (d3) -- (n3);
 draw[-Implies,line width=1pt,double distance=2pt] (n4) -- (s4);
 draw[-Implies,line width=1pt,double distance=2pt] (d5) -- (n5);
 draw[-Implies,line width=1pt,double distance=2pt] (d7) -- (n7);
endtikzpicture
enddocument

produces this, which is sufficient for my needs. Thanks @Zarko for the tip.
enter image description here

answered 25 mins ago

user1757226

263

New contributor

OK, I'm sure there's a better way to organize things inside the Tikz, but I have found a sufficient answer to my question myself. Posting here for posterity.

documentclass[]article

usepackagepgf, tikz
usetikzlibraryarrows, automata, positioning, arrows.meta

begindocument
begintikzpicture
[roundnode/.style=circle,draw=black!50,thick,
supplynode/.style=circle ,
 > = stealth, % arrow head style
 shorten > = 1pt, % don't touch arrow head to node
 auto,
 node distance = 3cm, % distance between nodes
 semithick % line style
]
 node at (0,0) [roundnode] (n1) 1;
 node at (2.5,2.5) [roundnode] (n2) 2;
 node at (0.0,5.0) [roundnode] (n3) 3;
 node at (5.0,0.0) [roundnode] (n4) 4;
 node at (5.0,4.0) [roundnode] (n5) 5;
 node at (10.0,5.0) [roundnode] (n6) 6;
 node at (10.0,0.0) [roundnode] (n7) 7;
 node at (7.5,2.5) [roundnode] (n8) 8;

 node at (-1.0, -1.0) [supplynode] (s1) 2;
 node at (2.5, 4.0) [supplynode] (s2) 1;
 node at (-1.0, 6.0) [supplynode] (d3) 2;
 node at (5.0,-1.5) [supplynode] (s4) 6;
 node at (6.5,4.0) [supplynode] (d5) 2;
 node at (11.5,0.0) [supplynode] (d7) 5;

 path[->] (n1) edge node 0 (n3);
 path[->] (n2) edge node 3 (n1);
 path[->] (n2) edge node 2 (n5);
 path[->] (n3) edge node 0 (n2);
 path[->] (n3) edge node 1 (n6);
 path[->] (n4) edge node 1 (n1);
 path[->] (n5) edge node 2 (n4);
 path[->] (n6) edge node 1 (n8);
 path[->] (n7) edge node 1 (n6);
 path[->] (n7) edge node 4 (n4);
 path[->] (n8) edge node 3 (n5);
 path[->] (n8) edge node 0 (n7);

 draw[-Implies,line width=1pt,double distance=2pt] (n1) -- (s1);
 draw[-Implies,line width=1pt,double distance=2pt] (n2) -- (s2);
 draw[-Implies,line width=1pt,double distance=2pt] (d3) -- (n3);
 draw[-Implies,line width=1pt,double distance=2pt] (n4) -- (s4);
 draw[-Implies,line width=1pt,double distance=2pt] (d5) -- (n5);
 draw[-Implies,line width=1pt,double distance=2pt] (d7) -- (n7);
endtikzpicture
enddocument

produces this, which is sufficient for my needs. Thanks @Zarko for the tip.
enter image description here

answered 25 mins ago

user1757226

263

New contributor

answered 25 mins ago

user1757226

263

New contributor

answered 25 mins ago

user1757226

263

answered 25 mins ago

user1757226

263

New contributor

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