82 lines
2.7 KiB
Kotlin
82 lines
2.7 KiB
Kotlin
import org.openrndr.MouseTracker
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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.*
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import org.openrndr.extra.jumpfill.DirectionalField
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import org.openrndr.extra.noise.simplex
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import org.openrndr.math.Vector2
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import org.openrndr.math.Vector3
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import org.openrndr.shape.Rectangle
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/**
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* Shows how to use the [DirectionalField] filter.
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* Draws moving white shapes on black background,
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* then applies the DirectionalField filter which returns a [ColorBuffer] in which
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* the red and green components encode the direction to the closest black/white edge.
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*
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* Hold down a mouse button to see the raw animation.
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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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}
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program {
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val rt = renderTarget(width, height) { colorBuffer() }
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val directionalField = DirectionalField().also {
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it.distanceScale = 0.004
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}
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// Needs to be FLOAT32 so we can have negative values
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val result = colorBuffer(width, height, type = ColorType.FLOAT32)
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val shader = shadeStyle {
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fragmentTransform = """
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x_fill.rgb = vec3(x_fill.rg + 0.5, x_fill.b);
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// interesting when distanceScale = 1.0
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//x_fill.rgb = vec3(1.0 / (x_fill.r + x_fill.g));
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"""
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}
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val mouseTracker = MouseTracker(mouse)
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extend {
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// Draw moving white shapes on a black background
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drawer.isolatedWithTarget(rt) {
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clear(ColorRGBa.BLACK)
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stroke = null
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fill = ColorRGBa.WHITE
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repeat(10) {
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val pos = Vector2.simplex(it, seconds * 0.2) *
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bounds.center + bounds.center
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val size = (it * it + 5.0) * 2.0
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isolated {
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translate(pos)
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if (it % 2 == 0) {
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circle(Vector2.ZERO, size)
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} else {
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rotate(Vector3.UNIT_Z, pos.x)
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rectangle(
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Rectangle.fromCenter(
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Vector2.ZERO, size, size * 2
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)
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)
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}
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}
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}
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}
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directionalField.apply(rt.colorBuffer(0), result)
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drawer.isolated {
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if (mouseTracker.pressedButtons.isEmpty()) {
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shadeStyle = shader
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image(result)
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} else {
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image(rt.colorBuffer(0))
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}
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}
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}
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}
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} |