Skip to content


There are two type of visualizations

  • Statistical plots to inspect distributions, trends and outliers. That's what described in this chapter
  • Process rendering to actually show simulation entities, their state or position changes on a 2D (or even 3D) grid as rendered movie. This may also involve interactive controls to adjust simulation parameters. Such functionality is planned but not yet implemented in kalasim

Examples * Movie Theater

Built-in Visualizations

Currently, the following extensions for distribution analysis are supported



  • CategoryTimeline<T>.display() provides a segment chart of the level
  • FrequencyTable<T>.display() provides a barchart of the frequencies of the different values
  • NumericStatisticMonitor.display() provides histogram of the underlying distribution
  • MetricTimeline.display() provides a line chart with time on the x and the value on y


  • r.activiities to show the activities as segments timeline
  • r.timeline to show the resource utilization and queuing status
  • All monitor related plots from above

Component Queue

  • All monitor related plots from above

For monitors, see corresponding section

Framework Support

By default, kalasim supports 2 pluggable visualization backends. Currently kravis and lets-plot are supported.

Since we may not be able to support all visualizations in both frontends, the user can simply toggle the frontend by package import:

// simply toggle backend by package import
import org.kalasim.plot.letsplot.display
// or
//import org.kalasim.plot.kravis.display

MM1Queue().apply {


kalasim integrates nicely with kravis to visualize monitor data. For examples see src/test/kotlin/org/kalasim/analytics/KravisVis.kt.


To visualize data with kravis, R must be installed on the system. See here) for details.


lets-plot is another very modern visualization library that renders within the JVM and thus does not have any external dependencies. Similar to kravis it mimics the API of ggplot2.