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1 vote
6k views

Hi everyone,

I am using SciChart trial in Angular and I find it so powerful
Thanks for developing this
However, I am having some troubles using it with plotting realtime stock data

From having searched around I found that it is recommended to use CategoryAxis for stock charts to avoid gaps on days without data
However, how do I append/update the data with new data coming in
XYDataSeries.append takes a number for the x-value

In the code below, assume “addNewData” is called every second
How do I properly add the new data with the new DateTime and also format it however i would like

Thanks for your help

  sciChartSurface.xAxes.add(new CategoryAxis(wasmContext));
  sciChartSurface.yAxes.add(new NumericAxis(wasmContext,{
    axisAlignment: EAxisAlignment.Left,
  }));

  addNewData(){
    const x = new Number(new Date()).toString()
    if(this.sciChartSurface){
      const series = this.sciChartSurface.renderableSeries.get(0);
      const dataSeries = <XyDataSeries> series.dataSeries;
      const x = dataSeries.count();
      const y = Math.random()
      dataSeries.append(x, y)
      this.sciChartSurface.zoomExtents()
    }
  }
1 vote
3k views

Hi,

I am using SciChart trial version to create a a simple line chart but when running an application for a while, I got this error in the dev console log – not sure what the root cause is but it seems to come from SciChart library

screenshot

  • Atanai W. asked 2 years ago
  • last active 2 years ago
1 vote
3k views

I am using SciChart with Next.js to create a real-time updated line chart. It works fine if there is 1 trace running with 130k datapoints. But when there are 4 traces (each with 130k datapoints) running in the chart, there is performance issue. After running for a while, this error is showing in the browser console:

“RangeError: Failed to execute ‘texImage2D’ on ‘WebGL2RenderingContext’: The ArrayBuffer/ArrayBufferView size exceeds the supported range.”

I tried to optimize the chart by following this page, but it doesn’t help on the lag issue.
https://www.scichart.com/documentation/js/current/Performance%20Tips.html

Here are my codes for updating the chart data:

if (SciChartSurface.renderableSeries.get(trace_num)) {
    SciChartSurface.renderableSeries.get(trace_num).dataSeries = new XyDataSeries(WasmContext, { xValues: dataX, yValues: dataY });
} else {
    const lineSeries = new FastLineRenderableSeries(WasmContext);
    lineSeries.strokeThickness = 1;
    lineSeries.stroke = tracesInfoRef[trace_num].color;
    lineSeries.dataSeries = new XyDataSeries(WasmContext, { xValues: dataX, yValues: dataY, dataIsSortedInX: true, dataEvenlySpacedInX: true, containsNaN: false });
    SciChartSurface.renderableSeries.add(lineSeries);
}

Can SciChart perform well with multiple traces which total datapoints larger than 500k? How can I fix the texImage2D error ?

  • Kelly Chan asked 2 years ago
  • last active 1 year ago
1 vote
3k views

Implementation scenario: multiple polylines are displayed. After clicking the polyline, the name of the polyline is displayed in the icon.

Question: I can get the Series Name through the SeriesSelectionModifier now, but I don’t know how to display the Series Name in the chart when the user clicks a polyline. Is there a corresponding API?

1 vote
2k views

I have a chart with a box annotation. When I try to resize the box annotation by dragging the left or right border, I got the “Uncaught TypeError: Cannot read properties of undefined (reading ‘x’)”. It’s not always reproducible and cannot be reproduced by dragging the whole box. Also, it only occurs with SciChart version 3 but not SciChart version 2. Please check the screenshots for more details.

  • Quyen Sy asked 1 year ago
  • last active 1 year ago
1 vote
1k views

Dear Andrew,

As mentioned in the previous question. we are getting ready to implement a comprehensive annotation and labeling functionality to our application. Although I know how to add scalable custom-annotations (your team guided us with the implementation in the past), an important part of of annotation functionality is. ability to edit the annotations. But I am having trouble accessing and interacting the the annotations.

How can I access the svg polygon nodes from the custom annotation and drag and move them? I have attched a video to show the existing functionality.

https://youtu.be/AkysJ2R3TyE1

Best,
Pramod

1 vote
5k views

I am working on a proof of concept for our company to move some of our desktop apps to the web. We use SciChart WPF in our desktop apps so we are going with SciChart.JS for the web apps. Is it possible to stack the FastLineRenderableSeries in SciChart.JS like we do in WPF?

Edit: Found the answer just after I posted this question.

sciChartSurface.layoutManager.leftOuterAxesLayoutStrategy = new LeftAlignedOuterVerticallyStackedAxisLayoutStrategy();

Screenshot of WPF Chart

1 vote
2k views

Hi,

I’m trying to render a mountain series with different colors in specific ranges.
I understand that this could be done using the palette provider.

I have done that, but the chart is behaving in a very strange way.

When dividing the chart to 2 color parts, when panning and scrolling it to a point that some of the points are out of window, the coloring starts to go crazy.

I have attached a few images that show the problem, and have also attached a file with the source code.
I have tested this on chrome version 116

Here’s the code

import {FastMountainRenderableSeries, XyDataSeries,ZoomPanModifier,EXyDirection,MouseWheelZoomModifier,NumericAxis,SciChartJSLightTheme, SciChartSurface, parseColorToUIntArgb, DefaultPaletteProvider, EStrokePaletteMode} from 'scichart'

SciChartSurface.UseCommunityLicense();
SciChartSurface.useWasmFromCDN();

class PaletteProvider extends DefaultPaletteProvider {
  constructor() {
    super();
    this.strokePaletteMode = EStrokePaletteMode.SOLID;
  }

  overrideStrokeArgb(xvalue) {    
    return xvalue > 200 ? parseColorToUIntArgb('#ff0000') : undefined
  }

  overrideFillArgb(xvalue) { 
    return xvalue > 200 ? parseColorToUIntArgb('#ff0000') : undefined
  }
}

const init = async () => {
  const {wasmContext, sciChartSurface} = await SciChartSurface.create('container', {theme: new SciChartJSLightTheme()})

  const xAxis = new NumericAxis(wasmContext);
  const yAxis = new NumericAxis(wasmContext);

  sciChartSurface.xAxes.add(xAxis)
  sciChartSurface.yAxes.add(yAxis)

  sciChartSurface.chartModifiers.add(new MouseWheelZoomModifier({xyDirection: EXyDirection.XDirection}))
  sciChartSurface.chartModifiers.add(new ZoomPanModifier({xyDirection: EXyDirection.XDirection}))

  const array = new Array(500).fill(0).map(val => Math.max(Math.random(), 0));
  const array2 = new Array(500).fill(0).map((val, index) => index);

  const dataSeries = new XyDataSeries(wasmContext)
  dataSeries.appendRange(array2, array);

  const series = new FastMountainRenderableSeries(wasmContext, {
    stroke: 'blue',
    fill: 'blue',
    strokeThickness: 3,
    zeroLineY: 0,
    dataSeries,
    paletteProvider: new PaletteProvider()
  })

  sciChartSurface.renderableSeries.add(series);
}

init();

Thanks for the help!

  • haba haba asked 7 months ago
  • last active 7 months ago
1 vote
2k views

I tried to use the trial version of SciChart with Next.js. But I got “SciChartSurface.setRuntimeLicenseKey is not a function” error. I don’t know what’s wrong, could you provide guideline for using SciChart with Next.js?

These are the codes in my next.config.js:

const CopyPlugin = require("copy-webpack-plugin");

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  swcMinify: true,
  webpack: ( config, { buildId, dev, isServer, defaultLoaders, nextRuntime, webpack } ) => {
    config.plugins.push(
            new CopyPlugin({
                patterns: [
                    { from: "node_modules/scichart/_wasm/scichart2d.data", to: "" },
                    { from: "node_modules/scichart/_wasm/scichart2d.wasm", to: "" }
                ]
            })
        );
    return config;
  },
}

module.exports = nextConfig

And I have imported these files in pages/index.js

import {SciChartSurface} from "scichart/Charting/Visuals/SciChartSurface";
import {NumericAxis} from "scichart/Charting/Visuals/Axis/NumericAxis";
  • Kelly Chan asked 2 years ago
  • last active 1 year ago
1 vote
1k views

stack overflow link : https://stackoverflow.com/questions/77781766/reactjs-sweep-line-optimizing-scichartjs-performance-reusing-wasmcontext-for-m

I have a performance problem with scichartjs, when initializing about 40 charts/surfaces the rendering state drops to 5-10 frames per second.

I think it might be related to the fact that I run the create function each time and not reusing the wasmContext maybe?
but I am not sure how to reuse the wasmContext or what is the best performance for this kind of type

demo : https://9669tv.csb.app/

enter image description here
(sorry for the low quality of the Giff due to 2 MB max size of upload)

this is my init function

export const initScichart = async (divElementId) => {
  SciChartSurface.UseCommunityLicense();
  //console.log(divElementId.id);
  const { sciChartSurface, wasmContext } = await SciChartSurface.create(
    divElementId,
    {
      theme: new SciChartJsNavyTheme(),
    }
  );

  sciChartSurface.xAxes.add(
    new NumericAxis(wasmContext, {
      visibleRange: new NumberRange(0, 5),
    })
  );
  sciChartSurface.yAxes.add(
    new NumericAxis(wasmContext, {
      autoRange: EAutoRange.Always,
    })
  );

  const xyDataSeries = new XyDataSeries(wasmContext, {
    fifoCapacity: 220_000, // set fifoCapacity. Requires scichart.js v3.2 or later
    fifoSweeping: true,
    fifoSweepingGap: 2_200,
    containsNaN: false,
    isSorted: true,
  });

  sciChartSurface.renderableSeries.add(
    new FastLineRenderableSeries(wasmContext, {
      dataSeries: xyDataSeries,
      strokeThickness: 1,
      stroke: "#50C7E0",
    })
  );

  xyDataSeries.sciChartSurfaceToDelete = sciChartSurface;

  return xyDataSeries;
};

enter image description here

the reason I need the charts on different surfaces is that I need to wrap them in SortableJS (to be able to drag them across the website)

1 vote
2k views

Error from chart in div instrument_candle_chart_2
RuntimeError: call_indirect to a signature that does not match (evaluating ‘invoker(fn, thisWired, arg0Wired, arg1Wired, arg2Wired, arg3Wired, arg4Wired, arg5Wired, arg6Wired, arg7Wired, arg8Wired)

error here: OhlcSeriesDrawingProvider.prototype.draw:

this.nativeDrawingProvider.DrawPointsVec(nativeContext, xDrawValues, openValues, highValues, lowValues, closeValues, renderPassData.xCoordinateCalculator.nativeCalculator, renderPassData.yCoordinateCalculator.nativeCalculator, this.args);

1 vote
3k views

Hello, I am using SciChartJS and have a new requirement from our users as follows that I need help with the implementation. Any pointers from anyone would be a great help.

**Requirements: **

  • Assume that x-axis is Time and y-axis is prices.
  • There are multiple series in the chart (e.g., Bid Price, Ask Price)
  • Allow user to select a time on xAxis using CTRL + CLICK
  • When the user selects the time, show the rollover line and the tooltip for all series at the selected time
  • This rollover line and tooltip should remain visible until the user selects a new time on the x-axis at which point the rollover tooltip should display the tooltip for the new point.

I started inheriting the RolloverModifier but couldn’t find an appropriate method to show the tooltip.

So, I started implementing the above feature using CustomModifierBase2d and adding a VerticalLineAnnotation for the rollover line. But again, struggling with the tooltip.

If someone could help me out or give me pointers, that would be highly appreciated.

Best Regards,
Sachin Patel.

1 vote
3k views

Hi. Is it possible to implement a depth chart like in the screenshot using scichart?! depth chart

1 vote
2k views

Hi Folks,

Wanted to ensure I’m working in the right direction here. Requirement is to add inline series labels on the plot surface. It’s an awkward requirement at times, but it keeps coming up with because other providers do this sometimes.

I’ve been playing with the examples of using data labels ( https://github.com/ABTSoftware/SciChart.JS.Examples/blob/master/Examples/src/components/Examples/Charts2D/TooltipsAndHittest/UsingVerticalSliceModifier/index.tsx ).

This might work. It’s a little strange since I only need to show at most one label per series. So I use the data label provider I assume and have to manually space them along the index range.

The only alternative I’m aware of is the annotations api, which of course is quite robust and probably a little too fancy for this case.

Appreciate any thoughts on the approach here — thanks!

EDIT: Attached very contrived example. The idea is to supply a label to name the series inline (apparently a legend is not sufficient), but in a way that is reasonably useful visually (similar to the spacing capabilities in the data labels api). The text would be some piece of metadata that is derived from the series (or at least has a 1:1 relationship with the series).

1 vote
2k views

Greetings,
i have three Series in a SciChart.js (Community-Version) Surface.
The Legend i added shows me all three of them and their names and checkboxes do hide or show the series.

Here is my problem: Is there a way to hide one Series (a FastCandlestickRenderableSeries) from the Legend? I only want to show the other two Series (FastLinerenderableSeries).

Somethin like a Parameter “showInLegend: false,”? I did not find something like this in the documentation(https://www.scichart.com/documentation/js/current/typedoc/classes/legendmodifier.html).

Thank you

0 votes
4k views

Hello!

Tell me what I’m doing wrong?
The error does not always appear (floating error).

enter image description here

In my code, along the stack, it will go to your product

enter image description here

0 votes
4k views

Hi,

Currently when we scroll the mouse pointer the zoom level is increasing/decreasing and when we click and drag the pan the chart. I want is when we scroll the chart should change the visible range (Pan chart), and clicking and selecting the area need to zoom like RubberBandXyZoomModifier. But I need to zoom only the X axis. Y axis should be the same as before zoom. Is this possible with SCI chart??

1 vote
2k views

Hello, I need to use tooltips to display information to users. However, after using the tooltip, there will be a jam after the tooltip appears and when zooming. How can I optimize the performance.

The following is the code. I use the js example: “Load 500 Series x 500 Points Performance Demo” for transformation

import { NumericAxis } from "scichart/Charting/Visuals/Axis/NumericAxis";
import { FastLineRenderableSeries } from "scichart/Charting/Visuals/RenderableSeries/FastLineRenderableSeries";
import { EllipsePointMarker } from "scichart/Charting/Visuals/PointMarkers/EllipsePointMarker";
import {
  RolloverModifier,
  TRolloverTooltipDataTemplate
} from "scichart/Charting/ChartModifiers/RolloverModifier";
import { ZoomPanModifier } from "scichart/Charting/ChartModifiers/ZoomPanModifier";
import { ZoomExtentsModifier } from "scichart/Charting/ChartModifiers/ZoomExtentsModifier";
import { MouseWheelZoomModifier } from "scichart/Charting/ChartModifiers/MouseWheelZoomModifier";
import { SciChartSurface } from "scichart";
import {
  IXyDataSeriesOptions,
  XyDataSeries
} from "scichart/Charting/Model/XyDataSeries";
import { NumberRange } from "scichart/Core/NumberRange";
import { EAutoRange } from "scichart/types/AutoRange";
import { convertRgbToHexColor } from "scichart/utils/convertColor";
// eslint-disable-next-line
SciChartSurface.useWasmFromCDN();

const divElementId = "scichart-root";

const color = "#368BC1";

const SERIES = 1500;
const POINTS = 188;


const drawExample = async (updateTimeSpans) => {
  const { sciChartSurface, wasmContext } = await SciChartSurface.create(
    divElementId,{ widthAspect: 3, heightAspect: 2}
  );
  const xAxis = new NumericAxis(wasmContext, {
    visibleRange: new NumberRange(0, POINTS),
    autoRange: EAutoRange.Never
});
sciChartSurface.xAxes.add(xAxis);
const dataSeriesArray= new Array(SERIES);;
const rendSeriesArray=new Array(SERIES);
const yAxis = new NumericAxis(wasmContext, {
    visibleRange: new NumberRange(-5000, 5000),
    autoRange: EAutoRange.Never
});
// yAxis.labelProvider.numericFormat = ENumericFormat.Decimal_0;
sciChartSurface.yAxes.add(yAxis);
for (let i = 0; i < SERIES; i++) {
  const dataSeries= new XyDataSeries(wasmContext);
  const rendSeries= new FastLineRenderableSeries(wasmContext, {
      dataSeries,
     stroke: color,
      strokeThickness: 3,
      pointMarker: new EllipsePointMarker(wasmContext, {
        width: 5,
        height: 5,
        strokeThickness: 2,
        fill: "white",
        stroke: color
      })
  });
  dataSeriesArray[i] = dataSeries;
  rendSeriesArray[i] = rendSeries;
sciChartSurface.renderableSeries.add(rendSeries);
}
sciChartSurface.chartModifiers.add(new ZoomExtentsModifier(), new ZoomPanModifier(), new MouseWheelZoomModifier(),new RolloverModifier(wasmContext));
const loadPoints = () => {
  const newTimeSpans=[];

  // Start counting Points generation time
  const generateTimestamp = Date.now();

  const xValuesArray = new Array(SERIES);
  const yValuesArray = new Array(SERIES);
  const strokeArray =  new Array(SERIES);
  for (let i = 0; i < SERIES; i++) {
      // Allocate data arrays
      xValuesArray[i] = new Array(POINTS);
      yValuesArray[i] = new Array(POINTS);

      // Clear data, if any
      dataSeriesArray[i].clear();

      // Generate stroke
      const r = Math.random();
      const g = Math.random();
      const b = Math.random();
      strokeArray[i] = convertRgbToHexColor(r, g, b);

      // Generate points
      let prevYValue = 0;
      for (let j = 0; j < POINTS; j++) {
          const curYValue = Math.random() * 10 - 5;

          xValuesArray[i][j] = j;
          yValuesArray[i][j] = prevYValue + curYValue;

          prevYValue += curYValue;
      }
  }

  // Add the first time span: Generating 1M data points
  newTimeSpans.push({
      title: "Generate 500x500 Data Points",
      durationMs: Date.now() - generateTimestamp
  });

  // Start counting batch append time
  const appendTimestamp = Date.now();
  for (let i = 0; i < SERIES; i++) {
      dataSeriesArray[i].appendRange(xValuesArray[i], yValuesArray[i]);
      rendSeriesArray[i].stroke = strokeArray[i];
  }

  // Add the second time span: Generation of data point
  newTimeSpans.push({
      title: "Append 500x500 Data Points",
      durationMs: Date.now() - appendTimestamp
  });

  // Subscribe to sciChartSurface.rendered event,
  // and calculate time duration between the append and
  // the first frame after it
  const firstFrameTimestamp = Date.now();
  let frameIndex = 0;
  let nextFramesTimestamp;
  const handler = () => {
      if (frameIndex === 0) {
          // Add the third time span: Render the first frame
          newTimeSpans.push({
              title: "Render the frame",
              durationMs: Date.now() - firstFrameTimestamp
          });
          nextFramesTimestamp = Date.now();
      } else {
          // Unsubscribe from sciChartSurface.rendered
          updateTimeSpans(newTimeSpans);
          sciChartSurface.rendered.unsubscribe(handler);

          // Zoom extents at the end of performance measurement
          sciChartSurface.zoomExtents();
      }
      setTimeout(sciChartSurface.invalidateElement, 0);
      // Increment frame index
      frameIndex++;
  };
  sciChartSurface.rendered.subscribe(handler);
};
  loadPoints()
};

drawExample();
1 vote
2k views

Hi,

I’ve had a request from the client of our app to set logarithmic axis to have their major ticks at powers of 10, for example 0.1|1|10|100|1000|10000 – they would be expressed as 1e-1|1e0|1e1|1e2|1e3|1e4…. etc.

Is this possible within the current implantation of the logarithmic axis?

Cheers,

  • Adam Stone asked 2 years ago
  • last active 2 years ago
1 vote
2k views

Hi I have an application where I would like to get the color information of the the pixel clicked on the uniformheatmap.

I am of course able to get the value, x, y using the hitTestProvider.hitTest but it does not contain any additional information regarding the color of the clicked pixel

Any help of direction is appreciated.

Pramod

1 vote
3k views

Hi,

I am creating an application where, we fetch data and display it in multiple heatmaps. The user can manipulate the heatmaps with changing colormap or changing ranges on the colormap.

Data from these multiple heatmaps is composited to another chart for visualization.

I was able to get a reference to the series, but adding the series to another chart errors with a message:

Invalid operation in sciChartSurface.attachSeries, this series has already been attached to a SciChartSurface. Please detach it from a SciChartSurface before attaching to another
at BaseRenderableSeries.onAttach (BaseRenderableSeries.js:634:1)
at __webpack_modules__../node_modules/scichart/Charting/Visuals/SciChartSurface.js.SciChartSurface.attachSeries (SciChartSurface.js:1385:1)

of course this means we cannot attach the same series to two different charts, but is there a way around this such as deepcloning?

renderable series: attached image

sample code: attached image

0 votes
4k views

Hi all,

I have another question about SciChart.js, I hope someone can teach me.

First, please download this video

This chart in video is made by d3.js, I hope I can use SciChart.js to make the same features,
please watch from 7 second to the end, when I click the mouse and move to the right direction, then click mouse again,
the section from first click to the second click will make different color, someone can teach me how to do that

PS: English is not my mother language, I wish you all can understand what I mean, Please download the video and watch, thanks.

1 vote
3k views

It seems to me that DateTimeNumericAxis has edge cases where it can’t calculate deltas for some ranges.
This results in a console error, and the chart not loading:

Error from chart in div date-axis-bug RangeError: Maximum call stack size exceeded
at get minTicks [as minTicks] (index.min.js:1:577149)
at a (index.min.js:1:577393)
at a (index.min.js:1:577567)
at a (index.min.js:1:577483)
at a (index.min.js:1:577567)
at a (index.min.js:1:577483)
at a (index.min.js:1:577567)
at a (index.min.js:1:577483)
at a (index.min.js:1:577567)
at a (index.min.js:1:577483)

Provided codepen: https://codepen.io/jrfv/pen/xxQawom

Any suggestions?
Thanks!

1 vote
1k views

Imagine I have a chart with a RolloverModifier, such that I see the point marker, and also a CursorModifier so I see the axis labels with the exact value I’m hovering.
This chart has the axis title hidden, and also the labels hidden, so I can really only see them trough the CursorModifier axis labels.
Since the axis title and labels are hidden, the axis labels spawn inside the chart, and the point marker from the RolloverModifier may be drawn on top of the labels.

I’d like to properly control drawing order here, so my axis labels get prioritised.
Is there a way to do so?

Codepen example: https://codepen.io/jrfv/full/VwqVBdo

0 votes
2k views

Hi there,

I am using scichart on a web application to plot 4 different plots simultaneously ( three using FastBandRenderableSeries and one using UniformHeatmapDataSeries).

When running on local environment everything works as expected (browser is very responsive) but when I push it to the production website it lags and my computer seems to be having hard time with the browser. I am still debugging it but thought to ask in case you have any recommendations ? Do you have performance related tips you can share?

I was reading on other posts about SciChartSurface.RenderPriority but it does not seem to exist in JS Scichart. Is there a workaround you can suggest?

Thank you,

  • Ihab Skafi asked 3 years ago
  • last active 3 years ago
1 vote
2k views

Hello,

When annotations and the rollover modifiers are displayed on the very left side of a chart they align with the center of the candlesticks on the chart. However, as they get displayed toward the right side of the chart they get more and more offset to the right side of the candlestick.

Can anyone point me in the right direction to figure out how to fix this issue seemingly with my xAxis?

See attached screenshots,

  • Leland asked 10 months ago
  • last active 10 months ago
1 vote
804 views

Hello,

I am experiencing an issue with the BoxAnnotation in SciChart where the precision of the box’s boundaries does not accurately match the data points it is supposed to represent. When dynamically creating a BoxAnnotation to highlight a range of values on a chart, the upper boundary (y2) is set to match the maximum value within the specified range. Despite the calculation seeming accurate, the rendered annotation’s top edge is visually lower than the top of the highest column it encompasses, creating a slight discrepancy. In my application, I am creating a lot of charts, and this issue occurs only on charts with a big data range.

Environment:

SciChart Version: 3.2.532
Browser: Chrome

Attaching code snippet on jsfiddle:
https://jsfiddle.net/c9dekx6v/2/

Regards,
Dmytro

1 vote
5k views

I’ve been trying to implement the scichart js blazor wrapper in a serverside application. The chart starts to load, but gives the following error:
Failed to load resource: the server responded with a status of 404 () :5001/scichart2d.data:1

it looks like scichart2d.data is in the wrong place, but as far as I can tell it’s where it should be (in wwwroot).

is there something special I need to do in sever side? I can get it working fine in webAssembly Blazor

1 vote
3k views

Hi,

We found that the part of our project that uses scichart does not work correctly on iOS12, and then we tried to open a browser on iOS12 to the scichart javascript demo webpage, and found that it did not work.

What is the minimum iOS version supported by javscript scichart?

1 vote
1k views

We created a medical simulation similar to your demo: https://demo.scichart.com/javascript-vital-signs-ecg-medical-chart-example

We choose scichart (JS) as the app has to be high performant. In development (I’m working on a mac machine) everything is working great. Now in production I’m surprised, that most computers in our hospital can’t handle scichart, as it is running extremely slow (really slow motion).
I checked also your demo app, which also runs only in slow motion. So it seems not to be an application problem, but a scichart problem. On my development machines there is no problem with the demo.

The slow motion problem occurs on our iPads and on multiple windows machines (VM) with e.g. intel i5 processor.

Is there anything I can do to get scichart JS apps running?

  • J Quader asked 3 months ago
  • last active 3 months ago
1 vote
2k views

Hi there,

Wow this library has come along way in ten years. My question is related to interaction between RS and the legend that is rendered by the chartmodifier.

I declare the legend something like this during the initial bootstrapping of the plot view:

        const legend = new LegendModifier({placementDivId: "legend-goes-here", id:"legend"});
        sciChartSurface.chartModifiers.add(legend);

After that, I have a custom interface available for users to change things, which eventually results in visibility or color changes, updating an RS something like this:

        const thisRs = surface.renderableSeries.getById(`${s.fileId}-${s.name}`);
        if (thisRs) {
            thisRs.isVisible = s.isVisible;
            thisRs.stroke = s.visualInfo?.colorCode ?? "#FFFFFF";
        } 

These changes do not appear to be propagated to the legend despite the series on the plot changing. I guess my questions are:

1) What’s the expected behavior/is there something obvious I’m missing about the model?
2) Any suggestions?

It may very well be somewhere lost in my fairly complex React app, but I first wanted to confirm that I’m not missing something in the api.

Thanks!
Dan

1 vote
2k views

Hi Andrew,

I have 2 independent questions,

Q1.
I have been working with uniform heatmap and I need a way to fix the aspect ratio to 1, for all resize, zoom events, is there an option in heatmap to fix an aspect ration? Please see the attached video
https://youtu.be/obhH6KLExYw

Q2.
I am trying to implement a lasso select method to select and highlight the heatmap data. I did not find lasso select in the documentation hence I went ahead and implemented my own method.

I am drawing an svg using D3 (offsetX and offsetY variables) and then adding it to the annotation as you will see in the video and trying to get all the hitTest data inside the lasso.

If I use the customAnnotation then heatmap is able to draw correct size and location of the SVG
customAnnotation:
https://youtu.be/gL34sAbxYSE

But it does not pan and zoom with the plot data. after looking through documentation I came across OverviewCustomResizableAnnotation which seems designed for zooming and panning with the data.

But while using the OverviewCustomResizableAnnotation the SVG size keeps changing during the update and is not located at the correct location relative to the data.

sciChartSurfaceRef.current.annotations.add(
new OverviewCustomResizableAnnotation({
id: "lassoSVG",
x1: shortestXinData,
y1: shortestYinData,
isEditable: false,
isSelected: false,
yCoordinateMode: ECoordinateMode.DataValue,
xCoordinateMode: ECoordinateMode.DataValue,
verticalAnchorPoint: EVerticalAnchorPoint.Top,
horizontalAnchorPoint: EHorizontalAnchorPoint.Left,
svgString: new XMLSerializer().serializeToString(svg.node())
})
)

OverviewCustomResizableAnnotation:
https://youtu.be/-AOJ9V3l-xI

Thanks,

Pramod

1 vote
3k views

I am considering applying server-side licensing for my javerScript application.

In the document below, there is a phrase “Our server-side licensing component is written in C++.”
(https://support.scichart.com/index.php?/Knowledgebase/Article/View/17256/42/)

However, there is only asp.net sample code on the provided github.
(https://github.com/ABTSoftware/SciChart.JS.Examples/tree/master/Sandbox/demo-dotnet-server-licensing)

I wonder if there is a sample code implemented in C++ for server-side licensing.

Can you provide c++ sample code?
Also, are there any examples to run on Ubuntu?

0 votes
2k views

I’m trying to have a transparent axisLabelFill for my yAxis and a black axisLabelFill for my xAxis. How can I achieve that?

0 votes
3k views

Hi there,

I got a error message, please tell me what’s wrong about my code ?
Please check the image, thank

Best Regards.
Yen Wen

1 vote
4k views

I need to set range for stock chart from some records(first today’s record, first record of day before yesterday, etc for week, month, start of current year and the first record of chart) to last record.

To set the range i need to get indexes of this rows. Tell me please how can i do this for stock xValues. May be i can mark some records to find if faster or i need to check every records from 0 to MAX and then select the range?

Thank you!

1 vote
9k views

Hello,
How can I animate an update of a candle or a bar in an OHLC type charts? I use realtime stock chart like this example.
When i update candle it redraws immediately with new values. But i want it to be updated with animation.

  • Vita Bubko asked 3 years ago
  • last active 2 years ago
1 vote
6k views

I have a real-time updated chart with multiple series. Is it possible for me to add a custom annotation to the chart by just providing the x1 value? i.e. The y1 value will be the y value of the data point in certain series with the provided x1 value. It will look like that the annotation will be sticked to the series with a fixed x1 value while the chart is updating.

1 vote
3k views

Hi,

I am facing a issue with latest version of SciChart. Because of this type error not able to build the project. Can you check this error.

1 vote
3k views

Hi

I am running Ubuntu 22.04.
I have done the following:
1. Downloaded licensing tool AppImage
2. chmod +x SciChart-Licensing-Wizard.AppImage
3. ./SciChart-Licensing-Wizard.AppImage

Response:

./SciChart-Licensing-Wizard.AppImage: 9: Syntax error: newline unexpected

Please advise.

Thanks

1 vote
2k views

Looking into https://www.scichart.com/documentation/js/current/typedoc/classes/scichartverticalgroup.html I see I can add surfaces to the group, but what about removing them?

I’ve constructed a problematic codepen to show a potential issue:
https://codepen.io/jrfv/full/JjwraLK

Any reason for not being able to remove surfaces from the group?

Thanks!

1 vote
4k views

Hello.

The graph is automatically stretched in width. How to do the same in height?

Video

1 vote
4k views

I have combed through KB articles and other documentations and samples here and SO, but I am not able to fix the issue. I am desperate for any help.

I have a react app that shows the chart, but at the top of the page, I have a header section and the remaining height is filled with Chart. All the samples and answers that I have seen thus far has no header section on the page. So the chart is 100% filled within it’s container. But, in my case the chart does not fit its container width & height and I end up with a scroll-bar. This is especially evident when you maximize the page (Chrome maximize window).

I am on Windows 10.

I have attached the code and a screen-shot of what the resulting page in Chrome. I have tried with and without CSS and it made no difference in terms of chart filling its container.

React Code:

import { useCallback, useEffect, useState } from 'react';
import { createRoot } from 'react-dom/client';
import './Chart-styles.scss';
import { SciChartSurface } from 'scichart/Charting/Visuals/SciChartSurface';
import { NumericAxis } from 'scichart/Charting/Visuals/Axis/NumericAxis';
import { getSciChartLicense } from '../common/chartUtils';

const Chart = () => {
const [chartId] = useState('line-chart');

const initChartAsync = useCallback(async () => {
    const { sciChartSurface, wasmContext } = await SciChartSurface.create(chartId);

    const xAxis = new NumericAxis(wasmContext);
    const yAxis = new NumericAxis(wasmContext);
    sciChartSurface.xAxes.add(xAxis);
    sciChartSurface.yAxes.add(yAxis);
}, []);

useEffect(() => {
    SciChartSurface.setRuntimeLicenseKey(getSciChartLicense());
    initChartAsync()
        .catch(error => {
            console.error('ChartRenderer | useEffect | initChartAsync failed!', error);
        });
}, [chartId]);

return (
    <div className="App">
        <div className='App-header'>
            <h2>Chart Header</h2>
            <h3>Chart Sub-Header</h3>
        </div>
        <div
            id={chartId}
            style={{width: '100%', height: '100%'}}
        />
    </div>
);
};

const container = document.getElementById('app');
const root = createRoot(container!);
root.render(<Chart/>);

Chart-Style.scss

#app {
    display: flex;
    flex-flow: column nowrap;
    margin: 0;
    padding: 0;
}

.App {
    flex: 1 1 auto;
    display: flex;
    flex-flow: column nowrap;
    text-align: center;
}

.App-header {
    flex: 0 1 auto;
    display: flex;
    flex-flow: column nowrap;
    background-color: #855b24;
    color: white;
    h2 {
        background-color: #2e2e2d;
        flex: 0 1 auto;
        margin: 0;
        padding: 2px;
    }
    h3 {
        background-color: #5c5c5b;
        flex: 0 1 auto;
        margin: 0;
        padding: 2px;
    }
}

#line-chart {
    flex: 1 1 auto;
}
0 votes
11k views

Scenario: user selects an area of a heatmap chart using a box annotation via a mouse drag.

I have created a custom modifier to draw the box annotation. I’ve used this as the basis: SimpleDataPointSelectionModifier.ts

My question is: how to I get the X axis start + end values and the Y axis start + end values based on the area of the annotation/mouse coordinates.

Thanks

1 vote
5k views

I am using a axis line chart from the js scichart. I want to change the font size of a legend. How do I change the font size of a legend?

  • info vcanus asked 11 months ago
  • last active 11 months ago
1 vote
3k views

A client responded that the line diagram drawn by scient.js on the mobile phone could not be seen.
We follow the user’s log and find that there is such content

2022/09/21 07:02:27.981 exception thrown: RuntimeError: function signature mismatch,RuntimeError: function signature mismatch
            at <anonymous>:wasm-function[2101]:0x5fc72
            at <anonymous>:wasm-function[1355]:0x2a029
            at <anonymous>:wasm-function[2409]:0x7ef3a
            at Ch (<anonymous>:wasm-function[4028]:0x12f27f)
            at r._main (<anonymous>:16:687711)
            at Object.Ma [as callMain] (<anonymous>:16:688823)
            at <anonymous>:16:565075

2022/09/21 07:02:27.981 Could not load SciChart WebAssembly module.
            Check your build process and ensure that your scichart2d.wasm, scichart2d.data and scichart2d.js files are from the same version

.
We try to reproduce many different devices. At present, it seems that only the device will happen. The following is the information of the device

0 votes
3k views
  1. Open Firefox.
  2. Go to scicharts demos, for example https://demo.scichart.com/javascript-multi-pane-stock-charts

Rendering speed is much slower than in Google Chrome; scrolling is freezing.
Also there are several errors and warnings in console.

1 vote
4k views

This is my first time in this forum, and I am analyzing SCIChart. I am planning to use it in my software, but there are some questions I haven’t been able to answer yet.
My software is similar to an IDE, where the user can build their custom applications and run on windows environment, but we also provide an option to save all the interface in html and javascript. Since SCIChart provides not only WPF Charts but also javascript Charts, I would like to know the following:

1- Does the javascript charts have the same functionalities as the wpf charts? XY Charts or Pie charts for example, will they have the same functionalities in WPF and Javascript ?

2- Does the appearence of the charts in WPF and Javascript are the same? Do they look exatcly the same?

I believe these are my biggest doubts so far. Thanks in advance !!

1 vote
4k views

Hello, has anyone found any solution with regards to using BigInt in SciChartJS. I am building an app that renders time series chart of say last 2 hours of market data activity of a given instrument (ESH3, a CME futures instrument).

The backend sends the data as JSON object in fragments (1000 fragments with 1000 items in an array fragment, so the total data for 2 hours is 1000 x 1000 = 1,000,000 items in an array).

Each item in the array has a time field (for x-axis) and say TradePrice (for y-axis). The time field is a unix time and it just cannot fit into the number field. So we parse it using BigInt as follows:
JSON.parse(rawData, (key, value) => {
if (key.includes('time')) return BigInt(value);
return value;
});

The parsing works, but, now SciChartJS is not happy about that. It needs number to append the data into its XyDataSeries object.

Has anyone come across this situation before and how have you solved this?

I am thinking the following and would appreciate if someone would give their 2nd opinion as well:
1. Convert to BigInt during deserializing
2. Create a global offset value — eg. Offset = nanoseconds since mid-night of 2020
3. Use Value – Offset as x value when appending to XyDataSeries
4. When a data-point is selected in chart, use SelectedTime + Offset for get to the original value from backend

Question for ScichartJS Support:
– Any provision to support BigInt in SciChartJS in near future? This would definitely help those in financial sector with requirements like I metioned above.

1 vote
1k views

Can I implement a feature in SciChart that allows me to pause and resume rendering activity on a SciChart renderable surface when a user clicks on the SciChart renderable surface?

  • Vishnu K U asked 5 months ago
  • last active 5 months ago
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