A simple and lightweight graphics library for Kotlin/Java. It's desinged to be easy-to-use for quick visualizing tasks.

Here's how Vis can be used:

showGraphics {
        //center is a property of `Screen` and is a `Point` to the center of it
        circle(center, 300.0)
        // draw a plot. `area` means the entire area of the root screen.
        plot(area, 37.0, 70.0, 0.7)

        // start a simple animation
        startAnimation(duration = 3000, frameRate = 30) {
            // do some animation!
        }
    }

The Screen Class represents an area in the screen that things can be directly drawn on.
A root Screen is automatically created after calling showGraphics which initialized graphics and opens a window.
New Screens can be added within the root Screen or other nested Screens at specified coordinates.

Starts up the the library and opens a window, accepts a lambda which is called when everything is ready:

showGraphics {
  // can now draw something!
  circle(center, 370.0)
 }

It has access the root Screen as receiver (this) inside the lambda.

Used to style the drawings on a screen. each sceen has its own Paint.

showGraphics {
    paint.strokeWidth = 0.3
    paint.color = Color(70, 70, 70, 0xff)
    paint.font = Font(paint.font.color, 10)
}

A Paint can also be used when drawing an individual shape only for that shape by passing a Paint to the drawing function:

val paint = ...
line(p(300.0, 300.0), p(700.0, 700.0), paint)

Coordinates in Vis adhere to the standard Cartesian system. This means that (0, 0) represents the bottom-left of the screen, unlike the top-left convention used in many other common frameworks.
Class Point(x, y) is used to represent a single point across the library.