[orx-shapes] Fix ShapeContour.roundCorners, add demo. Closes #333

orx-shapes/src/commonMain/kotlin/operators/ChamferCorners.kt

@@ -97,7 +97,7 @@ fun ShapeContour.chamferCorners(
                     moveOrLineTo(q0)
                     chamfer(q0, s0.end, q1)
                 } else {
-                    lineTo(s0.end)
+                    moveOrLineTo(s0.end)
                 }
             }
         }

orx-shapes/src/jvmDemo/kotlin/operators/DemoRoundCorners01.kt

@@ -0,0 +1,25 @@
+package operators
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.shapes.operators.roundCorners
+import org.openrndr.extra.shapes.primitives.regularStar
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val rp = regularStar(7, 150.0, 300.0, drawer.bounds.center)
+        extend {
+            drawer.clear(ColorRGBa.WHITE)
+            drawer.fill = null
+            drawer.stroke = ColorRGBa.BLACK.opacify(0.2)
+            for (i in 1 until 8 ) {
+                val r = rp.roundCorners(i * 15.0).close()
+                drawer.contour(r)
+            }
+        }
+    }
+}