vl.markBar()
.height(50).width(800)
.data( data )
.encode(
vl.x().fieldQ("startDate"),
vl.x2().fieldQ("endDate"),
vl.y().fieldQ("value"),
vl.y2().datum(0),
vl.tooltip("name"),
vl.color().fieldQ("value").scale({
domain:[1,5],
range: ["rgba(135,206,250,0.2)", "rgba(135,206,250,1.0)"]
}).legend(null),
)
.config({view: { "stroke": "transparent" }})
.render({renderer: "svg"})