[orx-jumpflood] Add signedMagnitude mode to DirectionalField

orx-jumpflood/src/jvmDemo/kotlin/DemoDirectionField02.kt

@@ -0,0 +1,54 @@
+import org.openrndr.MouseTracker
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.*
+import org.openrndr.drawImage
+import org.openrndr.extra.jumpfill.DirectionalField
+import org.openrndr.extra.noise.scatter
+import org.openrndr.extra.noise.simplex
+import org.openrndr.math.IntVector2
+import org.openrndr.math.Vector2
+import org.openrndr.math.Vector3
+import org.openrndr.math.clamp
+import org.openrndr.shape.Rectangle
+import kotlin.math.abs
+
+/**
+ * Create directional distance field and demonstrate signed distance
+ */
+fun main() = application {
+    configure {
+        width = 1024
+        height = 1024
+    }
+
+    program {
+        val input = drawImage(width, height, contentScale = 1.0) {
+            val points = drawer.bounds.scatter(100.0)
+            drawer.circles(points, 50.0)
+        }
+
+        val filter = DirectionalField()
+        val ddf = input.createEquivalent(type = ColorType.FLOAT32)
+
+        filter.signedMagnitude = true
+        filter.unitDirection = true
+        filter.apply(input, ddf)
+
+        ddf.shadow.download()
+        extend {
+            val p = (mouse.position * ddf.contentScale).toInt().clamp(IntVector2.ZERO, IntVector2(width-1, height-1))
+            val c = ddf.shadow[p.x, p.y]
+            val sdf3 = Vector3(c.r, c.g, c.b)
+
+            drawer.drawStyle.colorMatrix = constant(ColorRGBa.WHITE.shade(0.5)) * tint(ColorRGBa.WHITE.shade(0.5))
+
+            drawer.image(ddf)
+            drawer.fill = null
+            drawer.stroke = ColorRGBa.WHITE
+
+            drawer.circle(mouse.position, sdf3.z / ddf.contentScale)
+            drawer.lineSegment(mouse.position, mouse.position + sdf3.xy * sdf3.z)
+        }
+    }
+}