How do I make start/stop bar charts?

[#1]

Suppose I have this data:

Step	Start	Stop
mixer	0	2
heater1	1	12.3
injector1	4	4.5
mixer	6	8
heater2	10.3	13
injector1	12	12.5
heater1	16	25.4
mixer	18	20
heater2	23.4	30
mixer	24	26
fan	24	45
mixer	30	40

... and I want to make this plot (just the bars):

Is that possible with GraphBuilder?  (note this image is a mockup with PowerPoint)

[#2]

For now I would go with the marker draw expression and possibly add extra points within the "rectangle". Handling the color is a bit annoying as I don't think you can access color within set marker expr function, but you can manage for example with row states, adding color column to your table or picking the color from the marker. There could be some issues with local data filters, so I would probably avoid picking them from marker -> use color column or row states.

I think marker draw expression should be handle the local data filter fine. I haven't tested how well this works when you have large amount of data but there are most likely optimizations which could be done if that becomes an issue. You can also increase the height of bars to 0.4 (or values very close to 0.5) and they shouldn't overlap. In this case I replace middle marker with the rectangle and directly pick the color from row state

Names Default To Here(1);

dt = New Table("Demo",
	Add Rows(12),
	Compress File When Saved(1),
	New Column("Step", Character, "Nominal", Set Values({"mixer", "heater1", "injector1", "mixer", "heater2", "injector1", "heater1", "mixer", "heater2", "mixer", "fan", "mixer"})),
	New Column("Start", Numeric, "Continuous", Format("Best", 12), Set Values([0, 1, 4, 6, 10.3, 12, 16, 18, 23.4, 24, 24, 30])),
	New Column("Stop", Numeric, "Continuous", Format("Best", 12), Set Values([2, 12.3, 4.5, 8, 13, 12.5, 25.4, 20, 30, 26, 45, 40])),
	New Column("G", Character, "Nominal", Set Values({"G1", "G1", "G1", "G1", "G1", "G1", "G2", "G2", "G2", "G2", "G2", "G2"}))
);
dt << New Column("Middle", Numeric, Continuous, Formula(
	Mean(:Start, :Stop);
));

Column(dt, "Step") << Set Property("Value Colors", {"fan" = -15113984, "heater1" = -5682409, "heater2" = -40563, "injector1" = -29362, "mixer" = -13983232});
dt << Color or Mark by Column(:Step, Color(1), Marker(0));

gb = dt << Graph Builder(
	Size(528, 454),
	Show Control Panel(0),
	Variables(X(:Start), X(:Stop, Position(1)), X(:Middle, Position(1)), Y(:Step), Color(:Step)),
	Elements(Points(X(1), X(2), X(3), Y, Legend(10))),
	Local Data Filter(Add Filter(columns(:G))),
	SendToReport(
		Dispatch({}, "400", ScaleBox,
			{Legend Model(
				10,
				Properties(5, {Marker("Right Arrowhead")}, Item ID("Start", 1)),
				Properties(6, {Marker("Left Arrowhead")}, Item ID("Stop", 1))
			)}
		),
		Dispatch({}, "400", LegendBox, {Legend Position({10, [0, 1, 2, 3, 4, 5, 6, -1]})})
	)
);
 
frame = Report(gb)[FrameBox(1)];
seg = (frame << FindSeg(Marker Seg(3)));
seg << Set Marker Draw Expr(
	Function({this seg, this row, x, y, size, row state},
		Fill Color(Color Of(row state));
		Rect(:Start[this row], y + 0.4, :Stop[this row], y - 0.4, 1)
	)
);

Also it is also fairly easy easy to crash JMP when you start playing around with these.

[#3]

Will get much easier in September

[#4]

If you can, sign up for the JMP 19 Early Adopter program and give feedback on the planned Line element enhancements that will provide another way to do this.

[#5]

In the example that I gave, using Rect() in a << Add Graphics Script, you can click on the Start or Stop data Point and it will select the rows

[#6]

Jim, yes, I saw this, and it's a great workaround.  In my case, some of the bars will be very long and we expect to often be zoomed in on the timeline, which means I'd have to be plotting a whole bunch of points at intervals down the bar.  I'm also trying to make this plotter for others to use who aren't as familiar with JMP, and so forcing them to select a bar endpoint would require training and add process-friction.

[#7]

Here is my approach to creating the graph

Names Default To Here( 1 );
dt = Current Data Table();
gb = Graph Builder(
	Size( 534, 456 ),
	Show Control Panel( 0 ),
	Variables( X( :Start ), X( :Stop, Position( 1 ) ), Y( :Step ), Color( :Step ) ),
	Elements( Points( X( 1 ), X( 2 ), Y, Legend( 12 ) ) ),
	SendToReport(
		Dispatch( {}, "400", ScaleBox,
			{Legend Model(
				12,
				Properties( 5, {Marker( "FilledCircle" )}, Item ID( "Start", 1 ) ),
				Properties( 6, {Marker( "FilledCircle" )}, Item ID( "Stop", 1 ) )
			)}
		),
		Dispatch( {}, "graph title", TextEditBox, {Set Text( "Start - Stop Chart" )} )
	)
);

// Remove Start and Stop from legend
lgnd = gb << Get Legend Display;
items = lgnd << Get Items;
For Each( {item}, items,
	If( item << Get Label == "Start" | item << Get Label == "Stop",
		item << Set Visible( 0 )
	)
);

// Set default Value Colors if not set
if( isEmpty(dt:step << get property( "value colors" )),
dt:step << set property( "value colors", "" );
);

// Get the colors to use
colors = dt:step << get property( "value colors" );

// Find the labels for the Y Axis
Summarize( dt, levels = by( :step ) );

// Add a Graphics Script to create the bars on the graph
fb = Report( gb )[framebox( 1 )];
fb << add graphics script(	
	// Get the colors to use
	colors = dt:step << get property( "value colors" );
	For Each Row(
		cpoint = Contains( levels, :step ) - 1;
		Fill Color( Num( Word( 3, Char( colors[cpoint + 1] ), " " ) ) );
		Rect( :start, cPoint + .4, :stop, cPoint - .4, 1 );
		
	);
);