Added d3 force graph to GUI2 topology

Change-Id: I6860472efaf51ea27fad74e630e687f0c6abad3d
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.css b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.css
new file mode 100644
index 0000000..87c23bd
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.css
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/*
+ ONOS GUI -- Topology View (forces subRegion visual) -- CSS file
+ */
\ No newline at end of file
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.html b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.html
new file mode 100644
index 0000000..5760634
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.html
@@ -0,0 +1,23 @@
+<!--
+~ Copyright 2018-present Open Networking Foundation
+~
+~ Licensed under the Apache License, Version 2.0 (the "License");
+~ you may not use this file except in compliance with the License.
+~ You may obtain a copy of the License at
+~
+~     http://www.apache.org/licenses/LICENSE-2.0
+~
+~ Unless required by applicable law or agreed to in writing, software
+~ distributed under the License is distributed on an "AS IS" BASIS,
+~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+~ See the License for the specific language governing permissions and
+~ limitations under the License.
+-->
+<svg:g  xmlns:svg="http://www.w3.org/2000/svg" [attr.transform]="'translate(' + subRegion?.x + ',' + subRegion?.y + ')'">>
+  <svg:circle
+          cx="0"
+          cy="0"
+          r="5">
+  </svg:circle>
+  <svg:text>{{subRegion?.id}}</svg:text>
+</svg:g>
\ No newline at end of file
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.spec.ts b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.spec.ts
new file mode 100644
index 0000000..d6f6446
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.spec.ts
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SubRegionNodeSvgComponent } from './subregionnodesvg.component';
+import {SubRegion} from '../../models';
+
+describe('SubRegionNodeSvgComponent', () => {
+    let component: SubRegionNodeSvgComponent;
+    let fixture: ComponentFixture<SubRegionNodeSvgComponent>;
+
+    beforeEach(async(() => {
+        TestBed.configureTestingModule({
+            declarations: [ SubRegionNodeSvgComponent ]
+        })
+        .compileComponents();
+    }));
+
+    beforeEach(() => {
+        fixture = TestBed.createComponent(SubRegionNodeSvgComponent);
+        component = fixture.debugElement.componentInstance;
+        fixture.detectChanges();
+    });
+
+    it('should create', () => {
+        expect(component).toBeTruthy();
+    });
+
+    it('should create with an input', () => {
+        component.subRegion = new SubRegion('testId');
+        expect(component).toBeTruthy();
+    });
+});
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.ts b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.ts
new file mode 100644
index 0000000..5dd4736
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/subregionnodesvg/subregionnodesvg.component.ts
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {Component, Input, OnChanges, SimpleChanges} from '@angular/core';
+import {SubRegion} from '../../models';
+
+/**
+ * The SubRegion node in the force graph
+ *
+ * Note 1: here the selector is given square brackets [] so that it can be
+ * inserted in SVG element like a directive
+ * Note 2: the selector is exactly the same as the @Input alias to make this
+ * directive trick work
+ */
+@Component({
+    selector: '[onos-subregionnodesvg]',
+    templateUrl: './subregionnodesvg.component.html',
+    styleUrls: ['./subregionnodesvg.component.css']
+})
+export class SubRegionNodeSvgComponent implements OnChanges {
+    @Input() subRegion: SubRegion;
+
+    ngOnChanges(changes: SimpleChanges) {
+        if (!this.subRegion.x) {
+            this.subRegion.x = 0;
+            this.subRegion.y = 0;
+        }
+    }
+
+}