DemoDifferencing01.kt

import difference.differencing
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extra.delegatemagic.aggregation.aggregating
import org.openrndr.extra.delegatemagic.aggregation.maxMag
import org.openrndr.extra.delegatemagic.tracking.tracking
import org.openrndr.extra.gui.GUI
import org.openrndr.extra.parameters.DoubleParameter
import org.openrndr.math.Vector2

fun main() {
    application {
        program {
            val gui = GUI()

            val state = object {
                @DoubleParameter("radius", 0.0, 200.0)
                var radius = 100.0

                val difference by differencing(::radius)
                val differenceHistory by tracking(::difference)
                val differenceMax by aggregating(::differenceHistory) {
                    it.maxMag()
                }
            }

            gui.add(state, "state")

            extend(gui)
            extend {
                drawer.circle(drawer.bounds.center, state.radius)
                drawer.stroke = ColorRGBa.GREEN
                drawer.lineSegment(drawer.bounds.center, drawer.bounds.center + Vector2(state.difference, 0.0))
                drawer.translate(0.0, 4.0)
                drawer.stroke = ColorRGBa.BLUE
                drawer.lineSegment(drawer.bounds.center, drawer.bounds.center + Vector2(state.differenceMax, 0.0))
            }
        }
    }
}