include simple doctest for plot

ref #492

Author: Affie

docs/Project.toml

@@ -1,4 +1,6 @@
 [deps]
+Cairo = "159f3aea-2a34-519c-b102-8c37f9878175"
+Compose = "a81c6b42-2e10-5240-aca2-a61377ecd94b"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 GraphPlot = "a2cc645c-3eea-5389-862e-a155d0052231"
 LightGraphs = "093fc24a-ae57-5d10-9952-331d41423f4d"

docs/src/DrawingGraphs.md

@@ -13,18 +13,19 @@ Pkg.add("GraphPlot")
 
 Then bring `GraphPlot` in before DFG:
 
-```julia
+```@example plots; continued = true
 using GraphPlot
 using DistributedFactorGraphs
 ```
 
-Any factor graph can then be drawn by calling `dfgplot`:
+Any factor graph can then be drawn by calling [`dfgplot`](@ref):
 
-```julia
+```@example plots
+using Cairo # hide
 # Construct graph using IIF
 using IncrementalInference
 # Create graph
-dfg = LightDFG{SolverParams}(params=SolverParams())
+dfg = LightDFG{SolverParams}(solverParams=SolverParams())
 v1 = addVariable!(dfg, :x0, ContinuousScalar, labels = [:POSE], solvable=1)
 v2 = addVariable!(dfg, :x1, ContinuousScalar, labels = [:POSE], solvable=1)
 v3 = addVariable!(dfg, :l0, ContinuousScalar, labels = [:LANDMARK], solvable=1)
@@ -37,19 +38,22 @@ f1 = addFactor!(dfg, [:l0; :x1], LinearConditional(Normal(-10.0,5.0)), solvable=
 dfgplot(dfg)
 ```
 
-![imgs/initialgraph.jpg](imgs/initialgraph.jpg)
-
-- [`dfgplot`](@ref)
-
 ### Rendering GraphPlot to PDF
 
-The graph can be rendered to PDF or JPG in the following way:
+The graph can be rendered to PDF, SVG or JPG in the following way by including compose:
 
-```julia
-# Save to PDF
+```@example plots
 using Compose
-draw(PDF("/tmp/graph.pdf", 16cm, 16cm), dfgplot(dfg))
+# lets add another variable and factor and plot it
+dfg.solverParams.graphinit = false # hide
+addVariable!(dfg, :x2, ContinuousScalar);
+addFactor!(dfg, [:x1; :x2], LinearConditional(Normal(50.0,2.0)));
+# Save to SVG
+draw(SVG("graph.svg", 10cm, 10cm), dfgplot(dfg));
+nothing # hide
 ```
+![](graph.svg)
+
 
 ### More Information
 
@@ -63,12 +67,12 @@ and can be drawn by either:
 - Calling [`toDot`](@ref) on any graph to produce a string of the graph
 - Calling [`toDotFile`](@ref) on any graph to save it directly to a dotfile
 
-```julia
+```@example
 using DistributedFactorGraphs
 # Construct graph using IIF
 using IncrementalInference
 # Create graph
-dfg = GraphsDFG{SolverParams}(params=SolverParams())
+dfg = LightDFG{SolverParams}(solverParams=SolverParams())
 v1 = addVariable!(dfg, :x0, ContinuousScalar, labels = [:POSE], solvable=1)
 v2 = addVariable!(dfg, :x1, ContinuousScalar, labels = [:POSE], solvable=1)
 v3 = addVariable!(dfg, :l0, ContinuousScalar, labels = [:LANDMARK], solvable=1)
@@ -79,5 +83,6 @@ f1 = addFactor!(dfg, [:l0; :x1], LinearConditional(Normal(-10.0,5.0)), solvable=
 # Save to dot file
 toDotFile(dfg, "/tmp/test.dot")
 # Open with xdot
-run(`xdot /tmp/test.dot`)
+# run(`xdot /tmp/test.dot`)
+# nothing # hide
 ```