Can I use Kandy also completely and flawless in a ...

# datascience

[esionecneics]

Can I use Kandy also completely and flawless in a normal kt file? I have this function, which works fine in a Kotlin notebook, but NOT in a kt file:

import org.jetbrains.kotlinx.dataframe.DataFrame
import org.jetbrains.kotlinx.kandy.dsl.plot
import org.jetbrains.kotlinx.kandy.letsplot.layers.line
import org.jetbrains.kotlinx.kandy.util.color.Color


fun visualizeCustomerNumber(df: DataFrame<*>) {
    df.plot {
        line {
            x("createdAt") {
                axis {
                    name = "Date"
                }
            }
            y("customerNumber") {
                axis {
                    name = "Customer Number"
                }
            }
            color = Color.RED
        }
        layout {
            title = "Tomorrow Customer Number"
        }
    }
}

The keywords: |axis, name, layout, title| are recognized by IntelliJ
The import in the notebook on the other hand works perfectly with: %use kandy

This is the version I use in my build.gradle.kts:

dependencies {
implementation("org.jetbrains.kotlinxkandy lets plot0.8.0-RC1")
}

[Andrei Kislitsyn]

Hello. layout {} is an extension function and should be imported:

import org.jetbrains.kotlinx.kandy.letsplot.feature.layout

[esionecneics]

Thx for your answer and your support!

"layout" and "title" are now recognized by the IDE. It also recognizes "axis", but as soon as I write the { after it, “axis” is highlighted in red again. I had to use a different syntax for defining the names of the axes:

fun visualizeCustomerNumber(df: DataFrame<*>) {
    df.plot {
        line {
            x("createdAt") {
                axis.name = "Date"
            }
            y("customerNumber") {
                axis.name = "Customer Number"
            }
            color = Color.RED
        }
        layout {
            title = "Tomorrow Customer Number"
        }
    }
}

Then it works.

This means I have to use a different syntax depending on whether I am working in a notebook or a kt file. Why is that?

[Andrei Kislitsyn]

Oh, you need import org.jetbrains.kotlinx.kandy.util.context.invoke .
For some reason, IDEA doesn’t recognise it 😞.

[esionecneics]

Cool, this works. "axis" and "name" are now recognized. The only thing I still had to do was set the column names in quotes, which I didn't have to do in the notebook.

Thanks for your support ✨

[Andrei Kislitsyn]

Yes, when you’re working in a notebook, a dataframe extension properties are generated for each column. To make this work and in IDEA, you can add a DataFrame plugin (and set the data schema).
See kotlin dataframe docs