New to Spark NoteBook..Please Help

[mili sharma]

Hello spark-notebook-user,

I have a task in hand where I am supposed to visualize certain data in form of 2*2 matrix.
I have to use d3.js, spark, scala and spark-notebook for that, and sadly I am new to all of these including ubuntu :| .Do we have any predefined package or class that can generate matrix?

currently I am going through notebooks/misc/Using Javascript and Scala to add Reactive Chart type LIVE - D3 StreamGraph.snb example as a reference.
I was able to figure out most of the things in this example except :

import notebook.front.widgets._
import notebook.front.widgets.magic._
import notebook.front.widgets.magic.Implicits._
import notebook.front.widgets.magic.SamplerImplicits._
case class StreamgraphChart[C:ToPoints:Sampler](
  originalData:C,
  override val sizes:(Int, Int)=(600, 400),
  maxPoints:Int = 25,
  date:String,
  value:String,
  category:String,
  dateFormat:String
) extends Chart[C] {
    def mToSeq(t:MagicRenderPoint):Seq[(String, Any)] = t.data.toSeq


  override val snippets = List(s"""|{
                                   |  "f": $js,
                                   |  "o": {
                                   |    "category": "$category",
                                   |    "value": "$value",
                                   |    "date": "$date",
                                   |    "date_format": "$dateFormat"
                                   |  }
                                   |}
                                  """.stripMargin)
 
    override val scripts = List(notebook.front.Script("consoleDir", play.api.libs.json.Json.obj()))
 
}

Could you please explain me what exactly is StreamgraphChart[C:ToPoints:Sampler] and def mToSeq(t:MagicRenderPoint):Seq[(String, Any)] = t.data.toSeq for?

Many Thanks