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Add comments to bezierPatch demos, simplify. (#173)

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This commit is contained in:
Abe Pazos
2021-02-23 08:24:10 +01:00
committed by GitHub
parent 10aed4d53d
commit 8d6b82a24e
4 changed files with 95 additions and 42 deletions
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35
orx-shapes/src/demo/kotlin/DemoBezierPatch04.kt
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@@ -1,10 +1,16 @@
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extensions.Screenshots
import org.openrndr.extensions.SingleScreenshot
import org.openrndr.extra.shapes.bezierPatch
import org.openrndr.shape.Circle
/**
* Shows how to get positions and gradient values of those positions
* from a [bezierPatch]
*
* You can think of bezierPatch.position() as requesting points
* in a wavy flag (the bezier patch) using normalized uv coordinates.
*/
fun main() {
application {
configure {
@@ -17,23 +23,26 @@ fun main() {
this.outputFile = System.getProperty("screenshotPath")
}
}
val bp = bezierPatch(
Circle(drawer.bounds.center, 350.0).contour
//Rectangle.fromCenter(drawer.bounds.center, 550.0).contour
)
extend {
drawer.clear(ColorRGBa.PINK)
val bp = bezierPatch(Circle(width / 2.0, height / 2.0, 350.0).contour)
for (i in 0..50) {
drawer.stroke = ColorRGBa.BLACK.opacify(1.0)
}
drawer.stroke = ColorRGBa.BLACK
for (j in 1 until 50 step 2) {
for (i in 1 until 50 step 2) {
val p = bp.position(i / 50.0, j / 50.0)
val g2 = bp.gradient(i / 50.0, j / 50.0).normalized
val g = g2.perpendicular()
drawer.lineSegment(p, p + g2 * 10.0)
drawer.lineSegment(p, p - g2 * 10.0)
drawer.lineSegment(p, p + g * 10.0)
drawer.lineSegment(p, p - g * 10.0)
val u = i / 50.0
val v = j / 50.0
val pos = bp.position(u, v)
val grad = bp.gradient(u, v).normalized * 10.0
val perpendicular = grad.perpendicular()
drawer.lineSegment(pos - grad, pos + grad)
drawer.lineSegment(pos - perpendicular, pos + perpendicular)
//drawer.circle(pos + grad, 3.0)
}
}
}