Category: JavaScript

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-dev.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?

Hello

My application environment is on the mobile browser, so we need to switch between [pan] and [rollover]

When I use a button to switch, everything is fine, but when I want to switch with a long press, an exception occurs

Below is my code

    initModifier() {
        this.partitionList.forEach((obj, idx)=>{
            let sciChartSurface = this.sciObj[idx].sciChartSurface;
            this.zoomPanModifier[idx] = new ZoomPanModifier();
            this.rolloverModifier[idx] = new RolloverModifier({modifierGroup: this.modifierGroupId, showTooltip: false});
            this.zoomPanModifier[idx].isEnabled = true;
            // 擴增功能
            sciChartSurface.chartModifiers.add(
                this.zoomPanModifier[idx],
                new ZoomExtentsModifier(),
                new MouseWheelZoomModifier(),
                new PinchZoomModifier(),
            );
        });
    },
    switchCross() {
        let enablePan = !this.zoomPanModifier[0].isEnabled;
        this.partitionList.forEach((obj, idx)=>{
            let sciChartSurface = this.sciObj[idx].sciChartSurface;
            this.zoomPanModifier[idx].isEnabled = enablePan;
            if (enablePan)
                sciChartSurface.chartModifiers.removeAt(4);
            else
                sciChartSurface.chartModifiers.add(this.rolloverModifier[idx]);
        });
    },

I recorded a video, first use the button to switch, and then long press to switch, you can see the problem I want to narrate from the video, the URL is as follows: https://youtu.be/vJjbLNGS-iM

After the problem occurred, it was expected that touchmove should be [pan], but it became [zoom]

Thanks for your help

RubberBandXyZoomModifier Zoom visibleRangeChanged not hitting when zooming. Can you check this? or any callback function when zooming the chart?

import {SciChartSurface} from "scichart/Charting/Visuals/SciChartSurface";
import {NumericAxis} from "scichart/Charting/Visuals/Axis/NumericAxis";
import {XyDataSeries} from "scichart/Charting/Model/XyDataSeries";
import {FastLineRenderableSeries} from "scichart/Charting/Visuals/RenderableSeries/FastLineRenderableSeries";
import {XyScatterRenderableSeries} from "scichart/Charting/Visuals/RenderableSeries/XyScatterRenderableSeries";
import {EllipsePointMarker} from "scichart/Charting/Visuals/PointMarkers/EllipsePointMarker";
import {NumberRange} from "scichart/Core/NumberRange";
import {RubberBandXyZoomModifier} from "scichart/Charting/ChartModifiers/RubberBandXyZoomModifier";
import {ZoomExtentsModifier} from "scichart/Charting/ChartModifiers/ZoomExtentsModifier";
import {ZoomPanModifier} from "scichart/Charting/ChartModifiers/ZoomPanModifier";
import {EZoomState} from "scichart/types/ZoomState";
import { EExecuteOn } from "scichart/types/ExecuteOn";
import { EXyDirection } from "scichart/types/XyDirection";


async function initSciChart() {
    const {sciChartSurface, wasmContext} = await SciChartSurface.create("scichart-root");
    const xAxis = new NumericAxis(wasmContext);
    const yAxis = new NumericAxis(wasmContext);
    xAxis.visibleRangeChanged.subscribe((args) => {
        console.log("X Axis changed");
    });
    yAxis.visibleRangeChanged.subscribe((args) => {
        console.log("Y Axis changed");
    });
    sciChartSurface.xAxes.add(xAxis);
    sciChartSurface.yAxes.add(yAxis);
    const scatterSeries = new XyScatterRenderableSeries(wasmContext, {
        pointMarker: new EllipsePointMarker(wasmContext, {width: 7, height: 7, fill: "White", stroke: "SteelBlue"}),
    });
    const lineSeries = new FastLineRenderableSeries(wasmContext, {stroke: "#4083B7", strokeThickness: 2});
    sciChartSurface.renderableSeries.add(lineSeries, scatterSeries);
    const scatterData = new XyDataSeries(wasmContext, {dataSeriesName: "Cos(x)"});
    const lineData = new XyDataSeries(wasmContext, {dataSeriesName: "Sin(x)"});

    for (let i = 0; i < 1000; i++) {
        lineData.append(i, Math.sin(i * 0.1));
        scatterData.append(i, Math.cos(i * 0.1));
    }
    scatterSeries.dataSeries = scatterData;
    lineSeries.dataSeries = lineData;

    sciChartSurface.chartModifiers.add(new RubberBandXyZoomModifier({
        xyDirection: EXyDirection.XDirection
    }));
    const updateDataFunc = () => {
        const i = lineData.count();
        lineData.append(i, Math.sin(i * 0.1));
        scatterData.append(i, Math.cos(i * 0.1));
        if (sciChartSurface.zoomState !== EZoomState.UserZooming) {
            xAxis.visibleRange = new NumberRange(i - 1000, i);
        }
        setTimeout(updateDataFunc, 1 / 60);
    };
    updateDataFunc();
}

initSciChart();

Please check the example with v2.0.2146. Its working with older version and now its not working.
On the example the first time it will print the console. after that when zooming the change callback is not hitting.

Hi, I want to color the axis label by its value,

eg.
value < 0 -> show red color
value = 0 -> show gray color
value > 0 -> show green color

similar to this question, but in javascript platform, it seems the LabelProvider has function related to the value(string) formatting only. Is there any ways to styling the label? Thanks!

I have two charts in my app. Is there a way that I can make a rollover tooltip on a heatmap chart and the x visible range updates accordingly on another chart when the cursor moving around on the heatmap?

I had this function in Android version with the method InternalUpdate from CustomHeatmapTooltip which extended from UniformHeatmapTooltip. I wonder if there’s a listener for the tooltip.

Thanks.

Looking to try and “link” two timeseries charts when either one is zoomed. The link aspect would be updating the other chart to have the same visible range as the zoomed chart.

Each chart has its visibleRange property updated in response to separate socket events, that happen at similar intervals but different.

Originally, was hoping to have something similar to the onZoomExtents method that fires a callback that would allow me to grab the latest min/max of the visibleRangeProperty of the xAxes to then update the other chart.

Any suggestions on how I could go about doing this?

And if it is not clear what I am talking about I can provide some code snippets.

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();

Hi,

In my application I am using two charts for represent different values. I am using LegendModifier on the first chart. Is it possible when i uncheck the series on first chart and the same color series on second chart also need to hide from the second chart. Any event callback function available in LegendModifier ?

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?

How can I rotate the axis titles in SciChat JS?

We want the the titles Fp1 and Fp2 to be rotated so they are horizontal on the screen instead of vertical.

I have a large data set that I can’t really load into memory at once so instead I am paging the data, grabbing only what I require plus a little buffer either side so that the graph always has something in it.

To implement paging I need to change the position at which the graph starts rendering, unfortunately it seems that it is not possible to change UniformHeatmapDataSeries.xStart as set in the constructor.

Is the only way around this to recreate the heatmap from scratch every time a new page is loaded or am I missing another trick?

Hi,

I am facing a issue with RolloverModifier. I have multiple charts in single window. For some points the lines over the chart are missing.

Please find the attached images for some examples and the code for reproduce the issue. on the attachment you can see that the line on some chart is missing when mouse on left and right corner area of the chart

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;
}

Hello,

I have a BlazorWASM app. I am wondering how to sync the x values of different renderable series that have different number of data points.

In a simple form, I am passing in the data for a moving average to be rendered on the chart that has already been populated with data. The moving average data has already been calculated and has the correct date timestamps. But when I add this series to the chart it is starting at index 0 of where the the price data started instead of where the xAxis date of this renderable series has.

I prefer not to use the filters api to regenerate this data as some will be complex and have already been calculated by study or pulled from a database. I have seen the article to offset a series but this seems unnecessary since I already have the x axis coordinate that I want each point of the new line series to be rendered.

Is there somewhere in the docs that I missed how to get these renderable series to line up properly to their own x data points?

Thank you

Hi,

I am facing a issue with RolloverModifier. I have multiple charts in single window. For some points the lines over the chart are missing.

Please find the attached images for some examples and the code for reproduce the issue. on the attachment you can see that the line on some chart is missing when mouse on left and right corner area of the chart.

Posting again because on latest version also the same issue not resolved.
https://www.scichart.com/questions/js/rollovermodifier-in-multiple-chart-line-missing-on-some-areas

Hi. I’m trying to add 3DChart to my vue project. And I have a question about the configuration. Can I download .data and .wasm files from the CDN.

For 2D charts , I’ve used recomendation of your release v.2.2:
SciChartSurface.useWasmFromCDN()
It works for me. How I can use CDN for SciChart3DSurface?