Added a toString, operator == and hashCode to the Quad class. (#311)

* Added a toString, operator == and hashCode to the Quad class.

* Changed vector4 toString to be consistent with vector{2,3}.

* Fixed a couple of typos.

Author: bramp

lib/src/vector_math/quad.dart

@@ -88,4 +88,21 @@ class Quad {
     _point2.add(offset);
     _point3.add(offset);
   }
+
+  /// Returns a printable string
+  @override
+  String toString() => '[0] $_point0\n[1] $_point1\n'
+      '[2] $_point2\n[3] $_point3\n';
+
+  /// Check if two quad are the same.
+  @override
+  bool operator ==(Object other) =>
+      (other is Quad) &&
+      (_point3 == other._point3) &&
+      (_point2 == other._point2) &&
+      (_point1 == other._point1) &&
+      (_point0 == other._point0);
+
+  @override
+  int get hashCode => Object.hash(_point0, _point1, _point2, _point3);
 }

lib/src/vector_math/vector4.dart

@@ -119,8 +119,8 @@ class Vector4 implements Vector {
 
   /// Returns a printable string
   @override
-  String toString() => '${_v4storage[0]},${_v4storage[1]},'
-      '${_v4storage[2]},${_v4storage[3]}';
+  String toString() => '[${_v4storage[0]},${_v4storage[1]},'
+      '${_v4storage[2]},${_v4storage[3]}]';
 
   /// Check if two vectors are the same.
   @override

lib/src/vector_math_64/quad.dart

@@ -88,4 +88,21 @@ class Quad {
     _point2.add(offset);
     _point3.add(offset);
   }
+
+  /// Returns a printable string
+  @override
+  String toString() => '[0] $_point0\n[1] $_point1\n'
+      '[2] $_point2\n[3] $_point3\n';
+
+  /// Check if two quad are the same.
+  @override
+  bool operator ==(Object other) =>
+      (other is Quad) &&
+      (_point3 == other._point3) &&
+      (_point2 == other._point2) &&
+      (_point1 == other._point1) &&
+      (_point0 == other._point0);
+
+  @override
+  int get hashCode => Object.hash(_point0, _point1, _point2, _point3);
 }

lib/src/vector_math_64/vector4.dart

@@ -119,8 +119,8 @@ class Vector4 implements Vector {
 
   /// Returns a printable string
   @override
-  String toString() => '${_v4storage[0]},${_v4storage[1]},'
-      '${_v4storage[2]},${_v4storage[3]}';
+  String toString() => '[${_v4storage[0]},${_v4storage[1]},'
+      '${_v4storage[2]},${_v4storage[3]}]';
 
   /// Check if two vectors are the same.
   @override

test/quad_test.dart

@@ -48,10 +48,29 @@ void testQuadCopyTriangles() {
   relativeTest(t2Normal, normal);
 }
 
+void testQuadEquals() {
+  final v1 = Vector3(1.0, 0.0, 1.0);
+  final v2 = Vector3(0.0, 2.0, 1.0);
+  final v3 = Vector3(1.0, 0.0, 0.0);
+  final v4 = Vector3(0.0, 2.0, 0.0);
+  final quad = Quad.points(v1, v2, v3, v4);
+
+  expect(quad, Quad.points(v1, v2, v3, v4));
+
+  expect(quad, isNot(Quad.points(Vector3.zero(), v2, v3, v4)));
+  expect(quad, isNot(Quad.points(v1, Vector3.zero(), v3, v4)));
+  expect(quad, isNot(Quad.points(v1, v2, Vector3.zero(), v4)));
+  expect(quad, isNot(Quad.points(v1, v2, v3, Vector3.zero())));
+
+  expect(Quad.points(v1, v2, v3, v4).hashCode,
+      equals(Quad.points(v1, v2, v3, v4).hashCode));
+}
+
 void main() {
   group('Quad', () {
     test('Copy', testQuadCopy);
     test('CopyNormalInto', testQuadCopyNormalInto);
     test('CopyTriangles', testQuadCopyTriangles);
+    test('equals', testQuadEquals);
   });
 }