DemoBezierPatch02.kt

package bezierpatch

import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extra.shapes.bezierpatches.bezierPatch
import org.openrndr.shape.Circle
import org.openrndr.shape.ShapeContour

/**
 * Shows how to create a [bezierPatch] out of a
 * closed [ShapeContour] with 4 curved segments.
 *
 * Calling [Circle.contour] is one way of producing
 * such a contour with vertices at the cardinal points
 * but one can manually create any other 4-segment closed contour
 * to use in bezier patches.
 */
fun main() = application {
    configure {
        width = 800
        height = 800
    }
    program {
        val c = Circle(width / 2.0, height / 2.0, 350.0).contour
        val bp = bezierPatch(c)

        extend {
            drawer.clear(ColorRGBa.PINK)
            drawer.stroke = ColorRGBa.BLACK

            for (i in 0..10) {
                drawer.contour(bp.horizontal(i / 10.0))
                drawer.contour(bp.vertical(i / 10.0))
            }
        }
    }
}