Have students scan nest marker to join a sesssion

src/app/components/scan-nest/scan-nest.component.html

@@ -0,0 +1,11 @@
+<app-ar-view [markers]="this.nestMarkers" (markerStates)="this.onMarkerState($event)"></app-ar-view>
+<div class="nest-instruction">
+  Hover over your nest marker to scan it
+  <br>
+  Found Marker: {{(this.foundMarkerValue$ | async)}}
+</div>
+
+
+<ng-container *ngIf="(this.foundMarkerValue$ | async)">
+  <button mat-raised-button color="primary" class="scan-button">Scan Nest</button>
+</ng-container>

src/app/components/scan-nest/scan-nest.component.scss

@@ -0,0 +1,41 @@
+@import "../../../variables";
+
+@mixin responsive-font-size(
+  $for-phone-portrait,
+  $for-tablet-portrait,
+  $for-tablet-landscape,
+) {
+  font-size: $for-phone-portrait;
+  line-height: $for-phone-portrait;
+  @media (min-width: $tablet-portrait-min-width) {
+    font-size: $for-tablet-portrait;
+    line-height: $for-tablet-portrait;
+  }
+  @media (min-width: $tablet-landscape-min-width) {
+    font-size: $for-tablet-landscape;
+    line-height: $for-tablet-landscape;
+  }
+}
+
+.nest-instruction {
+  margin-top: 16px;
+  margin-bottom: 0;
+  margin-right: 8px;
+  margin-left: 8px;
+  text-align: center;
+
+  font-weight: bold;
+  color: white;
+  text-shadow: 0 0 0.6em #111;
+
+  @include responsive-font-size(2rem, 2.5rem, 3rem);
+}
+
+
+.scan-button {
+  position: absolute;
+  left: 40%;
+  bottom: 5%;
+  width: 150px;
+  height: 112px;
+}

src/app/components/scan-nest/scan-nest.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ScanNestComponent } from './scan-nest.component';
+
+xdescribe('ScanNestComponent', () => {
+  let component: ScanNestComponent;
+  let fixture: ComponentFixture<ScanNestComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ ScanNestComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ScanNestComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/scan-nest/scan-nest.component.ts

@@ -0,0 +1,58 @@
+import { Component, OnInit } from '@angular/core';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { distinctUntilChanged, map, shareReplay } from 'rxjs/operators';
+import { MarkerState } from '../ar-view/ar-view.component';
+import { ARMarker, MIN_NEST_MARKER, MAX_NEST_MARKER} from 'src/app/markers';
+
+@Component({
+  selector: 'app-scan-nest',
+  templateUrl: './scan-nest.component.html',
+  styleUrls: ['./scan-nest.component.scss']
+})
+export class ScanNestComponent implements OnInit {
+
+  constructor() { }
+
+  currentMarkerStates$ = new BehaviorSubject<MarkerState[]>([]);
+  nestMarkers: ARMarker[] = [];
+
+  foundMarkerValue$: Observable<number | null> = this.currentMarkerStates$.pipe(
+    map(markers => markers.filter(m => m.found)),
+    map(markers =>
+      markers.length > 0
+        ? markers.reduce((prev, curr) =>
+          prev.distance < curr.distance ? prev : curr
+        ).barcodeValue
+        : null
+    ),
+    distinctUntilChanged(),
+    shareReplay(1)
+  );
+
+  // How can the students distinguish between them scanning the wrong(non-nest) barcode
+  // and just not holding the camera well enough to detect a nest barcode. We could have
+  // all markers detectable and then use the following variable to tell students they
+  // are scanning a non-nest(or flower) barcode.
+
+  // foundNestMarker$: Observable<boolean | null>  = this.foundMarkerValue$.pipe(
+  //   map(val => val ? val >= MIN_NEST_MARKER && val <= MAX_NEST_MARKER : null),
+  //   distinctUntilChanged(),
+  //   shareReplay(1)
+  // );
+
+  onMarkerState(states: MarkerState[]) {
+    this.currentMarkerStates$.next(states);
+  }
+
+  ngOnInit() {
+    // This range specifies which barcode values should be detected.
+    for (let val = MIN_NEST_MARKER; val <= MAX_NEST_MARKER; val++) {
+      this.nestMarkers.push({
+        barcodeValue: val,
+        // A filler image that makes it easier to tell when a marker is being detected
+        imgPath: '/assets/art/512-square/nests/cavity.png'
+      });
+    }
+  }
+
+}

src/app/pages/student-display/student-display.module.ts

@@ -6,13 +6,18 @@ import { SharedModule } from 'src/app/shared.module';
 import { ArViewComponent } from 'src/app/components/ar-view/ar-view.component';
 import { PlayRoundComponent } from 'src/app/components/play-round/play-round.component';
 import { StudentRoundComponent } from 'src/app/components/student-round/student-round.component';
+import { ScanNestComponent } from 'src/app/components/scan-nest/scan-nest.component';
 
 
 const studentComponents = [
   StudentRoundComponent,
   PlayRoundComponent,
   ArViewComponent,
-  StudentRemovedDialogComponent
+  StudentRemovedDialogComponent,
+  // I am not sure how we could have students use AR to scan nest barcodes without loading AR into the main module.
+  // For now, I just put the ScanNestComponent here, so I can use the ARView Component without disturbing the existing structure
+  // too much.
+  ScanNestComponent
 ];
 
 @NgModule({