RadialColorReplacementFilter

class RadialColorReplacementFilter(val colors: List<Color>, val center: Pair<Int, Int>? = null) : RGBImageFilter(source)

Replaces all colors with one of colors depending on the angle relative to center.

colors

the colors that should be used, in clockwise order starting north-west

center

the center relative to which colors should be calculated; not required if only one color is given

Constructors

constructor(colors: List<Color>, center: Pair<Int, Int>? = null)

Holds constants.

private val center: Pair<Int, Int>? = null

private val colors: List<Color>

private fun asFraction(number: Int): Double

Represents a number in the range [0, 256) as a fraction of that range.

open override fun filterRGB(x: Int, y: Int, rgb: Int): Int

Returns the color to be displayed at (x, y), considering the coordinates relative to the center and the relative alpha of the encountered color.

private fun positionToColor(offset: Pair<Int, Int>): Color

Returns the appropriate color from colors for an offset relative to the center.

private fun shiftAlpha(toShift: Color, shiftBy: Color): @NotNull Color

Returns toShift which has its alpha multiplied by that of shiftBy.