DemoContourBlend02.kt

package blend

import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.isolated
import org.openrndr.extra.shapes.blend.blend
import org.openrndr.extra.shapes.primitives.grid
import org.openrndr.extra.shapes.primitives.regularStar
import org.openrndr.math.Vector2
import org.openrndr.shape.Circle
import kotlin.math.PI
import kotlin.math.cos

/**
 * Demonstration of non-uniform contour blending
 */
fun main() {
    application {
        configure {
            width = 720
            height = 720
        }
        program {
            val a = Circle(Vector2.ZERO, 90.0).contour
            val b = regularStar(5, 30.0, 90.0, center = Vector2.ZERO, phase = 180.0)
            val blend = a.blend(b)
            extend {
                drawer.clear(ColorRGBa.WHITE)
                drawer.fill = ColorRGBa.BLACK
                drawer.bounds.grid(3, 3).flatten().forEachIndexed { index, it ->
                    drawer.isolated {
                        drawer.translate(it.center)
                        drawer.contour(blend.mix { t -> cos(t * PI * 2.0 + index * PI * 2.0 / 9.0 + seconds) * 0.5 + 0.5 })
                    }
                }
            }
        }
    }
}