Pie

val dataset = dataFrameOf(
    "name" to listOf('a', 'b', 'c', 'd', 'b'),
    "value" to listOf(40, 90, 10, 50, 20)
)

Basic Pie Chart

dataset.plot {
    pie {
        slice(value)
        fillColor(name)
    }
}

Improve appearance

configure stroke
make the pie bigger
add hole to draw donut-like chart
use blank theme
use better colors

dataset.plot {
    pie {
        slice(value)
        fillColor(name) {
            scale = categoricalColorBrewer(BrewerPalette.Qualitative.Set1)
        }
        size = 20.0
        stroke = 1.0
        strokeColor = Color.WHITE
        hole = 0.5
    }
    layout {
        style(Style.Void)
    }
}

Explode

val length = dataFrameOf(
    "name" to listOf(
        "20-50 km",
        "50-75 km",
        "10-20 km",
        "75-100 km",
        "3-5 km",
        "7-10 km",
        "5-7 km",
        ">100 km",
        "2-3 km"
    ),
    "count" to listOf(1109, 696, 353, 192, 168, 86, 74, 65, 53),
    "explode" to listOf(.0, .0, .0, .1, .1, .2, .3, .4, .6)
)

length.plot {
    pie {
        fillColor(name) {
            scale = continuous(Color.named("dark_blue"), Color.LIGHT_GREEN)
        }
        slice(count)
        explode(explode)
        stroke = 1.0
        strokeColor = Color.BLACK
        size = 20.0
    }
    layout.style(Style.Void)
}

val calories = dataFrameOf(
    "slice" to listOf(35, 25, 25, 15),
    "label" to listOf("Apples", "Bananas", "Cherries", "Dates"),
    "explode" to listOf(.1, .0, .0, .0)
)

plotGrid(
    listOf(
        calories.plot {
            pie {
                slice(slice)
                explode(explode)
                fillColor(label) {
                    scale = categoricalColorBrewer(BrewerPalette.Qualitative.Set1)
                }
                size = 15.0
            }
            layout {
                style(Style.Void)
            }
        },
        calories.plot {
            pie {
                slice(slice)
                explode(explode)
                fillColor(label) {
                    scale = categoricalColorBrewer(BrewerPalette.Qualitative.Set1)
                }
                size = 15.0
                hole = 0.8
            }
            layout {
                style(Style.Void)
            }
        }
    )
)

Last modified: 13 May 2024