feat: Support Gantt plots with time scale.

ui/src/plot.tsx

@@ -492,9 +492,9 @@ export const
   }
 
 const
-  isF = (x: any): x is number => typeof x === 'number',
-  isB = (x: any): x is boolean => typeof x === 'boolean',
-  isS = (x: any): x is string => typeof x === 'string',
+  isF = (x: unknown): x is number => typeof x === 'number',
+  isB = (x: unknown): x is boolean => typeof x === 'boolean',
+  isS = (x: unknown): x is string => typeof x === 'string',
   split = (s: S) => s.trim().split(/\s+/g),
   parseInts = (s: S) => split(s).map(s => parseInt(s, 10)),
   convertToDates = (ds: any[], f: S) => {
@@ -939,7 +939,7 @@ const
 
     const
       type = getCoordType(marks) as any,
-      transpose = space === SpaceT.CD,
+      transpose = space === SpaceT.CD || space === SpaceT.TD,
       actions: CoordinateActions[] | undefined = transpose ? [['transpose']] : undefined
 
     if (transpose) for (const mark of marks) transposeMark(mark)

website/widgets/plots/interval.md

@@ -139,7 +139,7 @@ q.page['example'] = ui.plot_card(
 
 ## Range
 
-Make a column plot with each bar representing high/low (or start/end) values. Transposing this produces a Gantt plot.
+Make a column plot with each bar representing high/low (or start/end) values.
 
 ```py
 from h2o_wave import data
@@ -158,6 +158,27 @@ q.page['example'] = ui.plot_card(
 )
 ```
 
+## Gantt
+
+Make a Gantt plot with each bar representing high/low (or start/end) values.
+
+```py
+from h2o_wave import data
+
+q.page['example'] = ui.plot_card(
+    box='1 1 4 5',
+    title='Interval, range',
+    data=data('profession max min', 5, rows=[
+        ('medicine', '2022-01-01', '2020-01-01'),
+        ('fire fighting', '2021-06-01', '2021-01-01'),
+        ('pedagogy', '2020-06-01', '2022-01-01'),
+        ('psychology', '2021-01-01', '2022-01-01'),
+        ('computer science', '2020-01-01', '2022-01-01'),
+    ]),
+    plot=ui.plot([ui.mark(type='interval', y='=profession', x_scale='time', x0='=min', x='=max')])
+)
+```
+
 ## Polar
 
 Make a rose plot (a bar plot in polar coordinates).