Add regular polygon shape generator functions

2020-03-12 19:06:07 +01:00
parent 49d139a33f
commit 6e83f0551a
1 changed files with 97 additions and 0 deletions
--- a/orx-shapes/src/main/kotlin/RegularPolygon.kt
+++ b/orx-shapes/src/main/kotlin/RegularPolygon.kt
@@ -0,0 +1,97 @@
+package org.openrndr.extra.shapes
+
+import org.openrndr.math.Vector2
+import org.openrndr.shape.ShapeContour
+import org.openrndr.shape.contour
+import kotlin.math.cos
+import kotlin.math.sin
+
+fun regularPolygon(sides: Int, center: Vector2 = Vector2.ZERO, radius: Double = 100.0, phase: Double = 0.0): ShapeContour {
+    val c = contour {
+        val phi = Math.toRadians(phase)
+        for (i in 0 until sides) {
+            val x = center.x + radius * cos(i.toDouble() / sides * Math.PI * 2 + phi)
+            val y = center.y + radius * sin(i.toDouble() / sides * Math.PI * 2 + phi)
+
+            moveOrLineTo(x, y)
+        }
+        close()
+    }
+    return c.reversed
+}
+
+fun regularPolygonRounded(sides: Int, roundFactor: Double = 0.5, center: Vector2 = Vector2.ZERO, radius: Double = 100.0, phase: Double = 0.0): ShapeContour {
+    val c = contour {
+        val phi = Math.toRadians(phase)
+        for (i in 0 until sides) {
+            val x0 = center.x + radius * cos(i.toDouble() / sides * Math.PI * 2 + phi)
+            val y0 = center.y + radius * sin(i.toDouble() / sides * Math.PI * 2 + phi)
+
+            val x1 = center.x + radius * cos((i + 1.0) / sides * Math.PI * 2 + phi)
+            val y1 = center.y + radius * sin((i + 1.0) / sides * Math.PI * 2 + phi)
+
+            val x2 = center.x + radius * cos((i + 2.0) / sides * Math.PI * 2 + phi)
+            val y2 = center.y + radius * sin((i + 2.0) / sides * Math.PI * 2 + phi)
+
+            val f = roundFactor / 2.0
+
+            val dx10 = x1 - x0
+            val dy10 = y1 - y0
+            val dx21 = x2 - x1
+            val dy21 = y2 - y1
+
+            val x3 = x0 + dx10 * f
+            val y3 = y0 + dy10 * f
+
+            val x4 = x1 - dx10 * f
+            val y4 = y1 - dy10 * f
+
+            val x5 = x1 + dx21 * f
+            val y5 = y1 + dy21 * f
+
+            moveOrLineTo(x3, y3)
+            lineTo(x4, y4)
+            curveTo(x1, y1, x5, y5)
+        }
+        close()
+    }
+    return c.reversed
+}
+
+fun regularPolygonBeveled(sides: Int, bevelFactor: Double = 0.5, center: Vector2 = Vector2.ZERO, radius: Double = 100.0, phase: Double = 0.0): ShapeContour {
+    val c = contour {
+        val phi = Math.toRadians(phase)
+        for (i in 0 until sides) {
+            val x0 = center.x + radius * cos(i.toDouble() / sides * Math.PI * 2 + phi)
+            val y0 = center.y + radius * sin(i.toDouble() / sides * Math.PI * 2 + phi)
+
+            val x1 = center.x + radius * cos((i + 1.0) / sides * Math.PI * 2 + phi)
+            val y1 = center.y + radius * sin((i + 1.0) / sides * Math.PI * 2 + phi)
+
+            val x2 = center.x + radius * cos((i + 2.0) / sides * Math.PI * 2 + phi)
+            val y2 = center.y + radius * sin((i + 2.0) / sides * Math.PI * 2 + phi)
+
+            val f = bevelFactor / 2.0
+
+            val dx10 = x1 - x0
+            val dy10 = y1 - y0
+            val dx21 = x2 - x1
+            val dy21 = y2 - y1
+
+            val x3 = x0 + dx10 * f
+            val y3 = y0 + dy10 * f
+
+            val x4 = x1 - dx10 * f
+            val y4 = y1 - dy10 * f
+
+            val x5 = x1 + dx21 * f
+            val y5 = y1 + dy21 * f
+
+            moveOrLineTo(x3, y3)
+            lineTo(x4, y4)
+            lineTo(x5, y5)
+        }
+        close()
+    }
+    return c.reversed
+}