Add download feature on mining charts

frontend/src/app/components/block-fees-graph/block-fees-graph.component.ts

@@ -6,7 +6,7 @@ import { ApiService } from 'src/app/services/api.service';
 import { SeoService } from 'src/app/services/seo.service';
 import { formatNumber } from '@angular/common';
 import { FormBuilder, FormGroup } from '@angular/forms';
-import { formatterXAxisLabel } from 'src/app/shared/graphs.utils';
+import { download, formatterXAxisLabel } from 'src/app/shared/graphs.utils';
 import { StorageService } from 'src/app/services/storage.service';
 import { MiningService } from 'src/app/services/mining.service';
 
@@ -40,6 +40,7 @@ export class BlockFeesGraphComponent implements OnInit {
   isLoading = true;
   formatNumber = formatNumber;
   timespan = '';
+  chartInstance: any = undefined;
 
   constructor(
     @Inject(LOCALE_ID) public locale: string,
@@ -87,6 +88,7 @@ export class BlockFeesGraphComponent implements OnInit {
 
   prepareChartOptions(data) {
     this.chartOptions = {
+      backgroundColor: '#11131f',
       animation: false,
       color: [
         new graphic.LinearGradient(0, 0, 0, 0.65, [
@@ -194,7 +196,27 @@ export class BlockFeesGraphComponent implements OnInit {
     };
   }
 
+  onChartInit(ec) {
+    this.chartInstance = ec;
+  }
+
   isMobile() {
     return (window.innerWidth <= 767.98);
   }
+
+  onSaveChart() {
+    // @ts-ignore
+    const prevBottom = this.chartOptions.grid.bottom;
+    const now = new Date();
+    // @ts-ignore
+    this.chartOptions.grid.bottom = 40;
+    this.chartInstance.setOption(this.chartOptions);
+    download(this.chartInstance.getDataURL({
+      pixelRatio: 2,
+      excludeComponents: ['dataZoom'],
+    }), `block-fees-${this.timespan}-${now.getTime() / 1000}`);
+    // @ts-ignore
+    this.chartOptions.grid.bottom = prevBottom;
+    this.chartInstance.setOption(this.chartOptions);
+  }
 }