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Tweak contour intersection demos

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1. Change size of circles indicating intersections
to make it obvious that the circles are not filled,
and that only part of the intersecting shapes are
being drawn.

2. Make intersecting shapes more visible by using
different colors.

3. Animate self-intersecting shape.
This commit is contained in:
Abe Pazos
2020-08-01 11:07:20 +02:00
committed by Edwin Jakobs
parent 6060ebffcd
commit 7c97b80728
3 changed files with 16 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
openrndr-demos/src/demo/kotlin/DemoContourIntersections01.kt
View File

@@ -29,7 +29,7 @@ fun main() {
}
}
for (i in ints) {
drawer.circle(i.position, 15.0)
drawer.circle(i.position, 10.0)
}
}
}

3
openrndr-demos/src/demo/kotlin/DemoContourIntersections02.kt
View File

@@ -12,7 +12,6 @@ fun main() {
val circle = Circle(mouse.position, 200.0).contour
drawer.fill = null
drawer.stroke = ColorRGBa.GREEN
for (y in 50 until height step 100) {
for (x in 50 until width step 100) {
@@ -21,8 +20,10 @@ fun main() {
val ints = intersections(circle, r)
if (ints.isEmpty()) {
drawer.stroke = ColorRGBa.GREEN
drawer.contour(r)
} else {
drawer.stroke = ColorRGBa.WHITE
ints.map { it.contourTB }.let { it + it.take(1) }.zipWithNext().forEach {
val end = if (it.second <= it.first) it.second + 1.0 else it.second
val sub = r.sub(it.first, end)

22
openrndr-demos/src/demo/kotlin/DemoContourIntersections03.kt
View File

@@ -1,5 +1,6 @@
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.LineJoin
import org.openrndr.math.Vector2
import org.openrndr.shape.ShapeContour
import org.openrndr.shape.intersections
@@ -9,22 +10,25 @@ import kotlin.math.sin
fun main() = application {
program {
val contour = ShapeContour.fromPoints(
List(80) {
val a = PI * 2 * it / 80.0
val x = 200.0 * sin(a * 2)
val y = 200.0 * cos(a)
Vector2(x, y)
}, closed = true
)
val ints = intersections(contour, contour)
val points = 200
extend {
val contour = ShapeContour.fromPoints(
List(points) {
val a = PI * 2 * it / points
val x = (200 + 50 * cos(a * 2)) * sin(a * 3 + sin(a))
val y = 150 * cos(a * 2 + seconds * 0.2)
Vector2(x, y)
}, closed = true
)
val ints = intersections(contour, contour)
drawer.run {
clear(ColorRGBa.WHITE)
translate(width * 0.5, height * 0.5)
fill = null
stroke = ColorRGBa.BLACK
lineJoin = LineJoin.ROUND
contour(contour)
fill = ColorRGBa.PINK.opacify(0.3)
circles(ints.map { it.position }, 10.0)
}
}