Add corner chamfers to orx-shapes

orx-shapes/src/test/kotlin/Assertions.kt

@@ -0,0 +1,7 @@
+import org.amshove.kluent.shouldBeInRange
+import org.openrndr.math.Vector2
+
+infix fun Vector2.`should be near`(other: Vector2) {
+    x shouldBeInRange (other.x - 0.00001..other.x + 0.00001)
+    y shouldBeInRange (other.y - 0.00001..other.y + 0.00001)
+}

orx-shapes/src/test/kotlin/TestChamferCorners.kt

@@ -0,0 +1,153 @@
+import org.amshove.kluent.`should be equal to`
+import org.openrndr.extra.shapes.operators.bevelCorners
+import org.openrndr.extra.shapes.operators.roundCorners
+import org.openrndr.extra.shapes.regularPolygon
+import org.openrndr.shape.Circle
+import org.openrndr.shape.contour
+import org.spekframework.spek2.Spek
+import org.spekframework.spek2.style.specification.describe
+
+object TestChamferCorners : Spek({
+
+    describe("a single segment linear contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            lineTo(100.0, 100.0)
+        }
+
+        it("should be similar to a chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` 1
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a single segment quadratic contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            curveTo(40.0, 40.0, 100.0, 100.0)
+        }
+
+        it("should be similar to a chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` 1
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(0.5) `should be near` c.position(0.5)
+            cc.position(1.0) `should be near` c.position(1.0)
+        }
+    }
+
+    describe("a circle contour") {
+        val c = Circle(0.0, 0.0, 200.0).contour
+
+        it("should be similar to a chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` c.segments.size
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(0.5) `should be near` c.position(0.5)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a two segment linear contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            lineTo(50.0, 50.0)
+            lineTo(100.0, 50.0)
+        }
+        it("should chamfer correctly") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` 3
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a two segment linear-curve contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            lineTo(50.0, 50.0)
+            curveTo(80.0, 120.0, 100.0, 50.0)
+        }
+        it("should be identical to the chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` c.segments.size
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a two segment curve-linear contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            curveTo(80.0, 120.0, 50.0, 50.0)
+            lineTo(100.0, 50.0)
+
+        }
+        it("should be identical to the chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` c.segments.size
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a two segment curve-linear contour") {
+        val c = contour {
+            moveTo(0.0, 0.0)
+            curveTo(80.0, 120.0, 50.0, 50.0)
+            lineTo(100.0, 50.0)
+
+        }
+        it("should be identical to the chamfered version") {
+            val cc = c.bevelCorners(10.0)
+            cc.segments.size `should be equal to` c.segments.size
+            cc.position(0.0) `should be near` c.position(0.0)
+            cc.position(1.0) `should be near` c.position(1.0)
+            cc.closed `should be equal to` c.closed
+        }
+    }
+
+    describe("a triangle") {
+        val c = regularPolygon(3, radius = 100.0)
+
+        c.closed `should be equal to` true
+
+        val cc = c.roundCorners(1.0)
+
+        c.closed `should be equal to` cc.closed
+
+        val ccc = cc.roundCorners(1.0)
+
+        ccc.closed `should be equal to` cc.closed
+
+        cc.segments.size `should be equal to` 6
+
+        cc.segments.forEach {
+            println(it)
+        }
+
+        println("---")
+        ccc.segments.forEach {
+            println(it)
+        }
+        it("should have 6 sides") {
+            ccc.segments.size `should be equal to` cc.segments.size
+        }
+        it("should start at the right position") {
+            ccc.position(0.0) `should be near`  cc.position(0.0)
+        }
+        it("should end at the right position") {
+            ccc.position(1.0) `should be near`  cc.position(1.0)
+        }
+
+
+
+    }
+})