feat: add flipColumn and flipRow views

Author: targos

src/abstractMatrix.js

@@ -7,6 +7,8 @@ var util = require('./util');
 var MatrixTransposeView = require('./views/transpose');
 var MatrixRowView = require('./views/row');
 var MatrixColumnView = require('./views/column');
+var MatrixFlipRowView = require('./views/flipRow');
+var MatrixFlipColumnView = require('./views/flipColumn');
 
 function abstractMatrix(superCtor) {
     if (superCtor === undefined) superCtor = Object;
@@ -1192,6 +1194,14 @@ function abstractMatrix(superCtor) {
             util.checkColumnIndex(this, column);
             return new MatrixColumnView(this, column);
         }
+
+        flipRowView() {
+            return new MatrixFlipRowView(this);
+        }
+
+        flipColumnView() {
+            return new MatrixFlipColumnView(this);
+        }
     }
 
     Matrix.prototype.klass = 'Matrix';

src/views/flipColumn.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var BaseView = require('./base');
+
+class MatrixFlipColumnView extends BaseView {
+    constructor(matrix) {
+        super(matrix, matrix.rows, matrix.columns);
+    }
+
+    set(rowIndex, columnIndex, value) {
+        this.matrix.set(rowIndex, this.columns - columnIndex - 1, value);
+        return this;
+    }
+
+    get(rowIndex, columnIndex) {
+        return this.matrix.get(rowIndex, this.columns - columnIndex - 1);
+    }
+}
+
+module.exports = MatrixFlipColumnView;

src/views/flipRow.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var BaseView = require('./base');
+
+class MatrixFlipRowView extends BaseView {
+    constructor(matrix) {
+        super(matrix, matrix.rows, matrix.columns);
+    }
+
+    set(rowIndex, columnIndex, value) {
+        this.matrix.set(this.rows - rowIndex - 1, columnIndex, value);
+        return this;
+    }
+
+    get(rowIndex, columnIndex) {
+        return this.matrix.get(this.rows - rowIndex - 1, columnIndex);
+    }
+}
+
+module.exports = MatrixFlipRowView;

test/views/flipColumn.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var Matrix = require('../..');
+
+describe('Flip column view', function () {
+    it('should set and get values', function () {
+        var m = Matrix.ones(5, 8);
+        var view = m.flipColumnView();
+
+        m.set(0, 3, 5);
+        view.get(0, 4).should.equal(5);
+
+        view.set(0, 0, 10);
+        m.get(0, 7).should.equal(10);
+
+        view.rows.should.equal(5);
+        view.columns.should.equal(8);
+    });
+});

test/views/flipRow.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var Matrix = require('../..');
+
+describe('Flip row view', function () {
+    it('should set and get values', function () {
+        var m = Matrix.ones(5, 8);
+        var view = m.flipRowView();
+
+        m.set(0, 3, 5);
+        view.get(4, 3).should.equal(5);
+
+        view.set(0, 0, 10);
+        m.get(4, 0).should.equal(10);
+
+        view.rows.should.equal(5);
+        view.columns.should.equal(8);
+    });
+});