The ModelingToolkitDesigner.jl package is a helper tool for visualizing and editing ModelingToolkit.jl system connections.
r, previously was
wallwhich was not the best name
_name, this helps prevent a collision with nodes named
Examples can be found in the "examples" folder.
Let's start with a simple hydraulic system with no connections defined yet...
using ModelingToolkit using ModelingToolkitDesigner using GLMakie import ModelingToolkitStandardLibrary.Hydraulic.IsothermalCompressible as IC import ModelingToolkitStandardLibrary.Blocks as B @parameters t @component function system(; name) pars =  systems = @named begin stp = B.Step(;height = 10e5, start_time = 0.005) src = IC.InputSource(;p_int=0) vol = IC.FixedVolume(;p_int=0, vol=10.0) res = IC.Pipe(5; p_int=0, area=0.01, length=500.0) end eqs = Equation ODESystem(eqs, t, , pars; name, systems) end @named sys = system()
Then we can visualize the system using
ODESystemDesign() and the
path = joinpath(@__DIR__, "design") # folder where visualization info is saved and retrieved design = ODESystemDesign(sys, path); ModelingToolkitDesigner.view(design)
Components can then be positioned in several ways:
Nodes/Connectors can be positioned by selecting with the mouse and using the move node button. Note: Components and Nodes can be de-selected by right clicking anywhere or using the button clear selection
Connections can then be made by clicking 2 nodes and using the connect button. One can then click the save button which will store the visualization information in the
path location in a
.toml format as well as the connection code in
The connection code can also be obtained with the
julia> connection_code(design) connect(stp.output, src.input) connect(src.port, res.port_a) connect(vol.port, res.port_b)
After the original
system() component function is updated with the connection equations, the connections will be re-drawn automatically when using
ModelingToolkitDesigner.view(). Note: CairoMakie vector based images can also be generated by passing
false to the 2nd argument of
view() (i.e. the
If a component has a double lined box then it is possible to "look under the hood". Simply select the component and click open.
Edits made to sub-components can be saved and loaded directly or indirectly.
To generate more esthetic diagrams, one can use as special kind of component called a
PassThru, which simply defines 2 or more connected
connectors to serve as a corner, tee, or any other junction. Simply define a component function starting with
PassThru and ModelingToolkitDesigner.jl will recognize it as a special component type. For example for a corner with 2 connection points:
@component function PassThru2(;name) @variables t systems = @named begin p1 = Pin() p2 = Pin() end eqs = [ connect(p1, p2) ] return ODESystem(eqs, t, , ; name, systems) end
And for a tee with 3 connection points
@component function PassThru3(;name) @variables t systems = @named begin p1 = Pin() p2 = Pin() p3 = Pin() end eqs = [ connect(p1, p2, p3) ] return ODESystem(eqs, t, , ; name, systems) end
Adding these components to your system will then allow for corners, tees, etc. to be created. When editing is complete, use the toggle switch to hide the
PassThru details, showing a more esthetic connection diagram.
ModelingToolkitDesigner.jl comes with icons for the ModelingToolkitStandardLibrary.jl pre-loaded. For custom components, icons are loaded from either the
path variable supplied to
ODESystemDesign() or from an
icons folder of the package namespace. To find the paths ModelingToolkitDesign.jl is searching, run the following on the component of interest (for example
julia> println.(ModelingToolkitDesigner.get_icons(sys.vol, path)); ...\ModelingToolkitDesigner.jl\examples\design\ModelingToolkitStandardLibrary\Hydraulic\IsothermalCompressible\FixedVolume.png ...\ModelingToolkitStandardLibrary.jl\icons\ModelingToolkitStandardLibrary\Hydraulic\IsothermalCompressible\FixedVolume.png ...\ModelingToolkitDesigner.jl\icons\ModelingToolkitStandardLibrary\Hydraulic\IsothermalCompressible\FixedVolume.png
The first file location comes from the
path variable. The second is looking for a folder
icons in the component parent package, in this case
ModelingToolkitStandardLibrary, and the third path is from the
icons folder of this
ModelingToolkitDesigner package. The first real file is the chosen icon load path. Feel free to contribute icons here for any other public component libraries.
The icon rotation is controlled by the
r atribute in the saved
.toml design file. Currently this must be edited by hand. The default direction is "E" for east. The image direciton can change to any "N","S","E","W". For example, to rotate the capacitor icon by -90 degrees (i.e. from "E" to "N") simply edit the design file as
[capacitor] _n = "S" x = 0.51 y = 0.29 r = "N"
ModelingToolkitDesigner.jl colors the connections based on
ModelingToolkitDesigner.design_colors. Colors for the ModelingToolkitStandardLibrary.jl are already loaded. To add a custom connector color, simply use
add_color(system::ODESystem, color::Symbol) where
system is a reference to the connector (e.g.
color is a named color from Colors.jl.
PassThru's without requiring user to add
PassThrucomponents to ODESystem