Wires laid out atop one another

[Sandy Maguire]

First of all, I just wanted to thank you all for netlistsvg. This is a truly fantastic piece of software!

In some cases, netlistsvg will run wires atop one another, eg, highlighted in red:

with source JSON:

{"modules":{"module":{"ports":{},"cells":{"51":{"type":"andV","parameters":{"i0 : Bool_WIDTH":1,"i1 : Vec 4 Bool_WIDTH":4,"Vec 4 Bool_WIDTH":4},"attributes":{"name":"andV"},"port_directions":{"i0 : Bool":"input","i1 : Vec 4 Bool":"input","Vec 4 Bool":"output"},"connections":{"Vec 4 Bool":[47,48,49,50]}},"90":{"type":"andV","parameters":{"i0 : Bool_WIDTH":1,"i1 : Vec 4 Bool_WIDTH":4,"Vec 4 Bool_WIDTH":4},"attributes":{"name":"andV"},"port_directions":{"Vec 4 Bool":"output"},"connections":{"i0 : Bool":[63],"i1 : Vec 4 Bool":[73,75,77,79],"Vec 4 Bool":[86,87,88,89]}},"92":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[47,86],"Y":[91]}},"94":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[48,87],"Y":[93]}},"96":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[49,88],"Y":[95]}},"98":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[50,89],"Y":[97]}}}}}}

In this diagram, wires 48 and 86 are overlaid.

The above is a minimal example I pulled apart by hand. In case I butchered some invariant, the original was this:

{"modules":{"module":{"ports":{"in0 : AluOpCode":{"direction":"input","bits":[0,1,2]},"in1 : Word4":{"direction":"input","bits":[3,4,5,6]},"in2 : Word4":{"direction":"input","bits":[7,8,9,10]},"out0 : Vec 4 Bool":{"direction":"output","bits":[91,93,95,97]}},"cells":{"35":{"type":"case AluOpAdd","parameters":{"i0 : AluOpCode_WIDTH":3,"i1 : Word4_WIDTH":4,"i2 : Word4_WIDTH":4,"o0 : Bool_WIDTH":1,"o1 : Word4_WIDTH":4,"o2 : Word4_WIDTH":4},"attributes":{"name":"case AluOpAdd"},"port_directions":{"i0 : AluOpCode":"input","i1 : Word4":"input","i2 : Word4":"input","o0 : Bool":"output","o1 : Word4":"output","o2 : Word4":"output"},"connections":{"i0 : AluOpCode":[0,1,2],"i1 : Word4":[3,4,5,6],"i2 : Word4":[7,8,9,10],"o0 : Bool":[26],"o1 : Word4":[27,28,29,30],"o2 : Word4":[31,32,33,34]}},"41":{"type":"$add","parameters":{"A_WIDTH":4,"B_WIDTH":4,"Y_WIDTH":5},"attributes":{},"port_directions":{"A":"input","B":"input","Y":"output"},"connections":{"A":[27,28,29,30],"B":[31,32,33,34],"Y":[36,37,38,39,40]}},"51":{"type":"andV","parameters":{"i0 : Bool_WIDTH":1,"i1 : Vec 4 Bool_WIDTH":4,"o0 : Vec 4 Bool_WIDTH":4},"attributes":{"name":"andV"},"port_directions":{"i0 : Bool":"input","i1 : Vec 4 Bool":"input","o0 : Vec 4 Bool":"output"},"connections":{"i0 : Bool":[26],"i1 : Vec 4 Bool":[36,37,38,39],"o0 : Vec 4 Bool":[47,48,49,50]}},"72":{"type":"case AluOpAnd","parameters":{"i0 : AluOpCode_WIDTH":3,"i1 : Word4_WIDTH":4,"i2 : Word4_WIDTH":4,"o0 : Bool_WIDTH":1,"o1 : Word4_WIDTH":4,"o2 : Word4_WIDTH":4},"attributes":{"name":"case AluOpAnd"},"port_directions":{"i0 : AluOpCode":"input","i1 : Word4":"input","i2 : Word4":"input","o0 : Bool":"output","o1 : Word4":"output","o2 : Word4":"output"},"connections":{"i0 : AluOpCode":[0,1,2],"i1 : Word4":[3,4,5,6],"i2 : Word4":[7,8,9,10],"o0 : Bool":[63],"o1 : Word4":[64,65,66,67],"o2 : Word4":[68,69,70,71]}},"74":{"type":"$and","parameters":{"A_WIDTH":1,"B_WIDTH":1,"Y_WIDTH":1},"attributes":{},"port_directions":{"A":"input","B":"input","Y":"output"},"connections":{"A":[64],"B":[68],"Y":[73]}},"76":{"type":"$and","parameters":{"A_WIDTH":1,"B_WIDTH":1,"Y_WIDTH":1},"attributes":{},"port_directions":{"A":"input","B":"input","Y":"output"},"connections":{"A":[65],"B":[69],"Y":[75]}},"78":{"type":"$and","parameters":{"A_WIDTH":1,"B_WIDTH":1,"Y_WIDTH":1},"attributes":{},"port_directions":{"A":"input","B":"input","Y":"output"},"connections":{"A":[66],"B":[70],"Y":[77]}},"80":{"type":"$and","parameters":{"A_WIDTH":1,"B_WIDTH":1,"Y_WIDTH":1},"attributes":{},"port_directions":{"A":"input","B":"input","Y":"output"},"connections":{"A":[67],"B":[71],"Y":[79]}},"90":{"type":"andV","parameters":{"i0 : Bool_WIDTH":1,"i1 : Vec 4 Bool_WIDTH":4,"o0 : Vec 4 Bool_WIDTH":4},"attributes":{"name":"andV"},"port_directions":{"i0 : Bool":"input","i1 : Vec 4 Bool":"input","o0 : Vec 4 Bool":"output"},"connections":{"i0 : Bool":[63],"i1 : Vec 4 Bool":[73,75,77,79],"o0 : Vec 4 Bool":[86,87,88,89]}},"92":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[47,86],"Y":[91]}},"94":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[48,87],"Y":[93]}},"96":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[49,88],"Y":[95]}},"98":{"type":"$or","parameters":{"A_WIDTH":2},"attributes":{},"port_directions":{"A":"input","Y":"output"},"connections":{"A":[50,89],"Y":[97]}}}}}}

which also exhibits the bug.

[Margret Riegert]

This was an underlying problem within ELK itself here, but has since been fixed. Updating the version of ELKjs used by netlistsvg from 0.3.0 to 0.7.1 (the latest) didn't seem to break anything and it also fixed the issue you're experiencing.

[Sandy Maguire]

Thanks so much!