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

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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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41
orx-shapes/src/demo/kotlin/DemoBezierPatch01.kt
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@@ -3,7 +3,17 @@ import org.openrndr.color.ColorRGBa
import org.openrndr.extensions.SingleScreenshot
import org.openrndr.extra.shapes.bezierPatch
import org.openrndr.shape.LineSegment
import org.openrndr.shape.ShapeContour
/**
* Shows how to
* - create a [bezierPatch] out of 4 [LineSegment]
* - create a sub-patch out of a [bezierPatch]
* - create horizontal and vertical [ShapeContour]s out of [bezierPatch]es
*
* The created contours are horizontal and vertical in "bezier-patch space" but
* are rendered deformed following the shape of the bezier patch.
*/
fun main() {
application {
configure {
@@ -16,23 +26,34 @@ fun main() {
this.outputFile = System.getProperty("screenshotPath")
}
}
// helper to get screen locations using normalized uv values
fun pos(u: Double, v: Double) = drawer.bounds.position(u, v)
val c0 = LineSegment(pos(0.1, 0.1), pos(0.9, 0.1))
val c1 = LineSegment(pos(0.4, 0.3), pos(0.6, 0.4))
val c2 = LineSegment(pos(0.4, 0.7), pos(0.6, 0.6))
val c3 = LineSegment(pos(0.1, 0.9), pos(0.9, 0.9))
val bp = bezierPatch(c0.segment, c1.segment, c2.segment, c3.segment)
val bpSub = bp.sub(0.1, 0.1, 0.6,0.6)
extend {
drawer.clear(ColorRGBa.PINK)
val c0 = LineSegment(200.0, 100.0, width-200.0, 100.0).contour.segments.first()
val c1 = LineSegment(100.0, 150.0, width-100.0, 150.0).contour.segments.first()
val c2 = LineSegment(100.0, height-150.0, width-100.0, height-150.0).contour.segments.first()
val c3 = LineSegment(200.0, height-100.0, width-200.0, height-100.0).contour.segments.first()
// Show the line segments that form the bezier patch
drawer.stroke = ColorRGBa.YELLOW
drawer.strokeWeight = 5.0
drawer.lineSegments(listOf(c0, c1, c2, c3))
val bp = bezierPatch(c0, c1, c2, c3)
val bpsub = bp.sub(0.0, 0.0, 0.5, 0.5)
drawer.strokeWeight = 1.0
for (i in 0..50) {
drawer.stroke = ColorRGBa.BLACK
drawer.contour(bp.horizontal(i/50.0))
drawer.contour(bp.vertical(i/50.0))
drawer.contour(bp.horizontal(i / 50.0))
drawer.contour(bp.vertical(i / 50.0))
drawer.stroke = ColorRGBa.RED
drawer.contour(bpsub.horizontal(i/50.0))
drawer.contour(bpsub.vertical(i/50.0))
drawer.contour(bpSub.horizontal(i / 50.0))
drawer.contour(bpSub.vertical(i / 50.0))
}
}
}