62 lines
2.3 KiB
Kotlin
62 lines
2.3 KiB
Kotlin
package hobbycurve
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import org.openrndr.WindowMultisample
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import org.openrndr.application
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import org.openrndr.color.ColorRGBa
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import org.openrndr.draw.isolated
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import org.openrndr.extra.noise.scatter
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import org.openrndr.extra.noise.uniform
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import org.openrndr.extra.shapes.hobbycurve.hobbyCurve
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import org.openrndr.math.Vector3
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import kotlin.math.cos
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import kotlin.random.Random
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/**
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* Demonstrates how to use the 3D implementation of the `hobbyCurve` method, to draw a smooth curve passing
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* through various 3D points in space.
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*
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* The program first creates a random set of 2D points at least 200 pixels away from the window borders.
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*
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* Then, on every animation frame, it recreates a 3D hobby curve by giving depth to each 2D point.
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* The same seed is used for randomness, so the same depths are assigned on every animation frame, although
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* varying tensions are applied to each segment, based on cosines of the current time in seconds.
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*
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* Commenting out the camera rotation (`camera.rotate`) reveals how the segment tensions change over time.
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*
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* The last few lines of the program enable a rotating 3D camera and draw the 3D path.
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*/
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fun main() = application {
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configure {
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width = 720
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height = 720
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multisample = WindowMultisample.SampleCount(4)
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}
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program {
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val pts = drawer.bounds.scatter(30.0, distanceToEdge = 200.0, random = Random(3000))
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extend {
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drawer.stroke = ColorRGBa.PINK
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drawer.strokeWeight = 4.0
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drawer.fill = null
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val r = Random(3000)
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val hobby3D = hobbyCurve(
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pts.map { it.xy0 + Vector3(0.0, 0.0, Double.uniform(-360.0, 360.0, r)) },
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true,
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tensions = { chordIndex, inAngle, outAngle ->
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Pair(
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cos(seconds + chordIndex * 0.1) * 0.5 + 0.5,
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cos(seconds + (1.0 + chordIndex) * 0.1) * 0.5 + 0.5
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)
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})
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drawer.isolated {
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drawer.ortho(0.0, width.toDouble(), height.toDouble(), 0.0, -4000.0, 4000.0)
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drawer.translate(width / 2.0, height / 2.0)
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drawer.rotate(Vector3.UNIT_Y, seconds * 16.0)
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drawer.translate(-width / 2.0, -height / 2.0)
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drawer.path(hobby3D)
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}
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}
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}
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} |