51 lines
1.7 KiB
Kotlin
51 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.extensions.SingleScreenshot
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import org.openrndr.extra.shapes.bezierPatch
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import org.openrndr.shape.Circle
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/**
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* Shows how to get positions and gradient values of those positions
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* from a [bezierPatch]
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*
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* You can think of bezierPatch.position() as requesting points
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* in a wavy flag (the bezier patch) using normalized uv coordinates.
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*/
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suspend fun main() {
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application {
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configure {
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width = 800
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height = 800
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}
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program {
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if (System.getProperty("takeScreenshot") == "true") {
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extend(SingleScreenshot()) {
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this.outputFile = System.getProperty("screenshotPath")
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}
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}
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val bp = bezierPatch(
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Circle(drawer.bounds.center, 350.0).contour
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//Rectangle.fromCenter(drawer.bounds.center, 550.0).contour
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)
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extend {
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drawer.clear(ColorRGBa.PINK)
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drawer.stroke = ColorRGBa.BLACK
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for (j in 1 until 50 step 2) {
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for (i in 1 until 50 step 2) {
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val u = i / 50.0
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val v = j / 50.0
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val pos = bp.position(u, v)
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val grad = bp.gradient(u, v).normalized * 10.0
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val perpendicular = grad.perpendicular()
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drawer.lineSegment(pos - grad, pos + grad)
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drawer.lineSegment(pos - perpendicular, pos + perpendicular)
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//drawer.circle(pos + grad, 3.0)
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}
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}
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}
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}
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}
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} |