53 lines
1.8 KiB
Kotlin
53 lines
1.8 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.color.rgb
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import org.openrndr.extensions.SingleScreenshot
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import org.openrndr.extra.shadestyles.NPointLinearGradient
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import org.openrndr.shape.Rectangle
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import kotlin.math.pow
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import kotlin.math.sin
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/**
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* Demonstrate using a multi color linear gradient.
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* The gradient has 8 static saturated colors.
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* The positions of the colors are first distributed
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* uniformly between 0.0 and 1.0 and then animated towards one of
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* the ends over time using pow() and sin(seconds).
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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 = NPointLinearGradient(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(rgb(0.2))
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// The points should be sorted values between 0.0 and 1.0
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gradient.points = Array(numPoints) {
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// uniform distribution
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// (it / (numPoints - 1.0))
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// skewed and animated distribution
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(it / (numPoints - 1.0)).pow(1.0 + 0.5 * sin(seconds))
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}
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gradient.rotation = seconds * 10
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shadeStyle = gradient
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stroke = rgb(0.35)
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fill = ColorRGBa.WHITE
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strokeWeight = 8.0
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gradient.rotation = seconds * 10
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circle(bounds.position(0.34, 0.5), 110.0)
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gradient.rotation += 90
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rectangle(Rectangle.fromCenter(
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bounds.position(0.655, 0.5), 200.0, 200.0))
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}
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}
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}
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}
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} |