47 lines
1.5 KiB
Kotlin
47 lines
1.5 KiB
Kotlin
package alphashape
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import org.openrndr.application
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import org.openrndr.color.ColorRGBa
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import org.openrndr.extra.noise.shapes.uniform
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import org.openrndr.extra.shapes.alphashape.AlphaShape
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import org.openrndr.math.Vector2
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import kotlin.random.Random
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/**
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* Demonstrates the use of [AlphaShape] to create ten
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* [org.openrndr.shape.ShapeContour] instances out of a collection of random [Vector2] points.
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*
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* The same points are used for each contour, but an increased alpha parameter
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* is passed to the AlphaShape algorithm. Higher values return more convex shapes
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* = shapes with a larger surface.
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*
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* The list of shapes is reversed to draw the smaller contours on top, otherwise only
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* the last one would be visible.
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*
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* An instance of [Random] with a fixed seed is used to ensure the resulting
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* random shape is always the same.
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*/
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fun main() = application {
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program {
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val rand = Random(242)
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val points = List(40) {
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drawer.bounds.uniform(rand)
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}
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val alphaShape = AlphaShape(points)
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val minAlpha = alphaShape.determineContourAlpha()
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val contours = List(10) {
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alphaShape.createContour(minAlpha + it * it * it)
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}.reversed()
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extend {
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drawer.stroke = null
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contours.forEachIndexed { index, contour ->
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drawer.fill = ColorRGBa.PINK.shade(0.5 + index * 0.07)
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drawer.contour(contour)
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}
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drawer.fill = ColorRGBa.WHITE
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drawer.circles(points, 4.0)
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}
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}
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} |