LayersManager

src/app/cartography/map/map.component.ts

@@ -6,7 +6,7 @@ import {select, Selection} from 'd3-selection';
 
 import { Node } from "../shared/models/node";
 import { Link } from "../shared/models/link";
-import { GraphLayout } from "../shared/widgets/graph";
+import { GraphLayout } from "../shared/widgets/graph-layout";
 import { Context } from "../shared/models/context";
 import { Size } from "../shared/models/size";
 import { Drawing } from "../shared/models/drawing";

src/app/cartography/shared/managers/layers-manager.spec.ts

@@ -0,0 +1,76 @@
+import { LayersManager } from "./layers-manager";
+import { Node } from "../models/node";
+import { Drawing } from "../models/drawing";
+import { Link } from "../models/link";
+
+
+describe('LayersManager', () => {
+  let manager: LayersManager;
+
+  beforeEach(() => {
+    manager = new LayersManager();
+  });
+
+  it('nodes should be added', () => {
+    const node_1 = new Node();
+    node_1.z = 1;
+    const node_2 = new Node();
+    node_2.z = 2;
+
+    manager.setNodes([node_1, node_2]);
+    const layers = manager.getLayersList();
+    expect(layers.length).toEqual(2);
+    expect(layers[0].nodes.length).toEqual(1);
+    expect(layers[0].index).toEqual(1);
+    expect(layers[1].nodes.length).toEqual(1);
+    expect(layers[1].index).toEqual(2);
+  });
+
+  it('drawings should be added', () => {
+    const drawing_1 = new Drawing();
+    drawing_1.z = 1;
+    const drawing_2 = new Drawing();
+    drawing_2.z = 2;
+
+    manager.setDrawings([drawing_1, drawing_2]);
+    const layers = manager.getLayersList();
+    expect(layers.length).toEqual(2);
+    expect(layers[0].drawings.length).toEqual(1);
+    expect(layers[0].index).toEqual(1);
+    expect(layers[1].drawings.length).toEqual(1);
+    expect(layers[1].index).toEqual(2);
+  });
+
+  it('links should be added', () => {
+    const node_1 = new Node();
+    node_1.z = 1;
+
+    const node_2 = new Node();
+    node_2.z = 2;
+
+    const link_1 = new Link();
+    link_1.source = node_1;
+    link_1.target = node_1;
+
+    const link_2 = new Link();
+    link_2.source = node_1;
+    link_2.target = node_1;
+
+    manager.setLinks([link_1, link_2]);
+    const layers = manager.getLayersList();
+    expect(layers.length).toEqual(1);
+    expect(layers[0].links.length).toEqual(2);
+    expect(layers[0].index).toEqual(1);
+  });
+
+  it('layers should be cleared', () => {
+    const node_1 = new Node();
+    node_1.z = 1;
+    const node_2 = new Node();
+    node_2.z = 2;
+
+    manager.setNodes([node_1, node_2]);
+    manager.clear();
+    expect(manager.getLayersList().length).toEqual(0);
+  });
+});

src/app/cartography/shared/managers/layers-manager.ts

@@ -0,0 +1,60 @@
+import { Layer } from "../models/layer";
+import { Node } from "../models/node";
+import { Drawing } from "../models/drawing";
+import { Link } from "../models/link";
+import { Dictionary } from "../models/types";
+
+
+export class LayersManager {
+  private layers: Dictionary<Layer>;
+
+  constructor() {
+    this.layers = {};
+  }
+
+  public getLayersList(): Layer[] {
+    return Object.keys(this.layers).sort((a: string, b: string) => {
+      return Number(a) - Number(b);
+    }).map((key: string) => {
+      return this.layers[key];
+    });
+  }
+
+  public setNodes(nodes: Node[]) {
+    nodes
+      .forEach((node: Node) => {
+        const layer = this.getLayerForKey(node.z.toString());
+        layer.nodes.push(node);
+      });
+  }
+
+  public setDrawings(drawings: Drawing[]) {
+    drawings
+      .forEach((drawing: Drawing) => {
+        const layer = this.getLayerForKey(drawing.z.toString());
+        layer.drawings.push(drawing);
+      });
+  }
+
+  public setLinks(links: Link[]) {
+    links
+      .filter((link: Link) => link.source && link.target)
+      .forEach((link: Link) => {
+        const key = Math.min(link.source.z, link.target.z).toString();
+        const layer = this.getLayerForKey(key);
+        layer.links.push(link);
+      });
+  }
+
+  public clear() {
+    this.layers = {};
+  }
+
+  public getLayerForKey(key: string): Layer {
+    if (!(key in this.layers)) {
+      this.layers[key] = new Layer();
+      this.layers[key].index = Number(key);
+    }
+    return this.layers[key];
+  }
+}

src/app/cartography/shared/models/layer.ts

@@ -7,4 +7,10 @@ export class Layer {
   nodes: Node[];
   drawings: Drawing[];
   links: Link[];
+
+  constructor() {
+    this.nodes = [];
+    this.drawings = [];
+    this.links = [];
+  }
 }

src/app/cartography/shared/models/types.ts

@@ -1,3 +1,7 @@
 import {BaseType, Selection} from "d3-selection";
 
 export type SVGSelection = Selection<SVGElement, any, BaseType, any>;
+
+export interface Dictionary<T> {
+    [Key: string]: T;
+}

src/app/cartography/shared/widgets/graph-layout.ts

@@ -11,7 +11,7 @@ import { DrawingLineWidget } from "./drawing-line";
 import { SelectionTool } from "../tools/selection-tool";
 import { MovingTool } from "../tools/moving-tool";
 import { LayersWidget } from "./layers";
-import { Layer } from "../models/layer";
+import { LayersManager } from "../managers/layers-manager";
 
 
 export class GraphLayout implements Widget {
@@ -98,56 +98,13 @@ export class GraphLayout implements Widget {
         (ctx: Context) => `translate(${ctx.getSize().width / 2}, ${ctx.getSize().height / 2})`);
     }
 
-
-    const layers = {};
-
-    this.nodes.forEach((n: Node) => {
-      const key = n.z.toString();
-      if (!(key in layers)) {
-        layers[key] = new Layer();
-        layers[key].nodes = [];
-        layers[key].drawings = [];
-        layers[key].links = [];
-      }
-      layers[key].nodes.push(n);
-    });
-
-
-    this.drawings.forEach((d: Drawing) => {
-      const key = d.z.toString();
-      if (!(key in layers)) {
-        layers[key] = new Layer();
-        layers[key].nodes = [];
-        layers[key].drawings = [];
-        layers[key].links = [];
-      }
-      layers[key].drawings.push(d);
-    });
-
-    this.links.forEach((l: Link) => {
-      if (!l.source || !l.target) {
-        return;
-      }
-
-      const key = Math.min(l.source.z, l.target.z).toString();
-
-      if (!(key in layers)) {
-        layers[key] = new Layer();
-        layers[key].nodes = [];
-        layers[key].drawings = [];
-        layers[key].links = [];
-      }
-      layers[key].links.push(l);
-    });
-
-    const layers_list: Layer[] = Object.keys(layers).sort((a: string, b: string) => {
-      return Number(a) - Number(b);
-    }).map((key: string) => {
-      return layers[key];
-    });
+    const layersManager = new LayersManager();
+    layersManager.setNodes(this.nodes);
+    layersManager.setDrawings(this.drawings);
+    layersManager.setLinks(this.links);
 
     this.layersWidget.graphLayout = this;
-    this.layersWidget.draw(canvas, layers_list);
+    this.layersWidget.draw(canvas, layersManager.getLayersList());
 
     this.drawingLineTool.draw(view, context);
     this.selectionTool.draw(view, context);

src/app/cartography/shared/widgets/layers.spec.ts

@@ -6,7 +6,7 @@ import { Layer } from "../models/layer";
 import { LinksWidget } from "./links";
 import { NodesWidget } from "./nodes";
 import { DrawingsWidget } from "./drawings";
-import { GraphLayout } from "./graph";
+import { GraphLayout } from "./graph-layout";
 
 
 describe('LayersWidget', () => {

src/app/cartography/shared/widgets/layers.ts

@@ -1,6 +1,6 @@
 import { Widget } from "./widget";
 import { SVGSelection } from "../models/types";
-import { GraphLayout } from "./graph";
+import { GraphLayout } from "./graph-layout";
 import { Layer } from "../models/layer";