47 lines
1.7 KiB
Kotlin
47 lines
1.7 KiB
Kotlin
import org.openrndr.application
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import org.openrndr.color.ColorRGBa
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import org.openrndr.color.ColorXSVa
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import org.openrndr.extensions.SingleScreenshot
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import org.openrndr.extra.shadestyles.NPointGradient
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import org.openrndr.math.Polar
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import org.openrndr.shape.ShapeContour
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import kotlin.math.PI
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import kotlin.math.cos
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/**
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* Demonstrate using an n-point gradient.
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* The gradient has 8 points in screen coordinates and 8 colors.
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* The colors are fixed, the points of the gradient move.
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* A contour is drawn using the same points from the gradient,
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* but note that this is not necessary: you can animate the gradient
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* on a static shape (a circle for example) or you can animate a shape
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* with a static gradient.
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*/
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fun main() {
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application {
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program {
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val numPoints = 8
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val gradient = NPointGradient(Array(numPoints) {
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ColorXSVa(it * 360.0 / numPoints, 1.0, 1.0).toRGBa()
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})
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extend {
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drawer.run {
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clear(ColorRGBa.WHITE.shade(0.9))
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val t = PI * 2 * (frameCount % 300) / 300.0
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val points = Array(numPoints) {
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val lfo = cos(it * PI / 2 - t)
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val theta = it * 360.0 / numPoints - 22.5 * lfo
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val radius = 200 + 170 * lfo
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bounds.center + Polar(theta, radius).cartesian
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}
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gradient.points = points
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shadeStyle = gradient
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stroke = ColorRGBa.WHITE
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strokeWeight = 4.0
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contour(ShapeContour.fromPoints(points.asList(), true))
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}
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}
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}
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}
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} |