Questions

I have just learned how to use sci-chart framework with tutorials.
And I tried to add values from bluetooth as realtime chart as shown in tutorials.
I have finished receiving data from a Bluetooth connection.
However, using scichart to represent this data in real time is hard to solve by looking at the tutorial alone.
Does anyone have any idea how to use real-time tutorials to teach you how to represent your own data, not the example sine graph?

The code below is what I tried and is wrong.

import UIKit
import CoreBluetooth
import SciChart

let maestroServiceCBUUID = CBUUID(string:”495sdfd3-FE7D-4AE5-8FA9-9FAFD205E455″)
let maestroBrainDataCBUUID = CBUUID(string: “4953sdf3-1E4D-4BD9-BA61-23C647249616”)
class HRMViewController: UIViewController {
var sciChartSurface: SCIChartSurface?

var lineDataSeries: SCIXyDataSeries!
var scatterDataSeries: SCIXyDataSeries!

var lineRenderableSeries: SCIFastLineRenderableSeries!
var scatterRenderableSeries: SCIXyScatterRenderableSeries!

var timer: Timer?
var phase = 0.0
var i = 0

@IBOutlet weak var brainRateLabel: UILabel!

var centralManager: CBCentralManager!
var maestroPeripheral:CBPeripheral!
override func viewDidLoad() {
super.viewDidLoad()

sciChartSurface = SCIChartSurface(frame: self.view.bounds)
sciChartSurface?.autoresizingMask = [.flexibleHeight, .flexibleWidth]
sciChartSurface?.translatesAutoresizingMaskIntoConstraints = true

self.view.addSubview(sciChartSurface!)


let xAxis = SCINumericAxis()
xAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))
sciChartSurface?.xAxes.add(xAxis)

let yAxis = SCINumericAxis()
yAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))
sciChartSurface?.yAxes.add(yAxis)

createRenderableSeries()
addModifiers()


centralManager = CBCentralManager(delegate: self , queue: nil)

// Make the digits monospaces to avoid shifting when the numbers change

}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)

if nil == timer{
  timer = Timer.scheduledTimer(withTimeInterval: 0.01, repeats: true, block: updatingDataPoints)
}

}

override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)

if nil != timer{
  timer?.invalidate()
  timer = nil
}

}

func updatingDataPoints(timer:Timer){

i += 1

lineDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1 + phase)))
scatterDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1 + phase)))

phase += 0.01

sciChartSurface?.zoomExtents()
sciChartSurface?.invalidateElement()

}

func createDataSeries(_brainwave2:Double){
// Init line data series
lineDataSeries = SCIXyDataSeries(xType: .double, yType: .double)
lineDataSeries.fifoCapacity = 500
lineDataSeries.seriesName = “line series”

// Init scatter data series

// scatterDataSeries = SCIXyDataSeries(xType: .double, yType: .double)
// scatterDataSeries.fifoCapacity = 500
// scatterDataSeries.seriesName = “scatter series”

for i in 0...500{
  lineDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(_brainwave2))

// scatterDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1)))
}

i = Int(lineDataSeries.count())

}

func createRenderableSeries(){
lineRenderableSeries = SCIFastLineRenderableSeries()
lineRenderableSeries.dataSeries = lineDataSeries

scatterRenderableSeries = SCIXyScatterRenderableSeries()
scatterRenderableSeries.dataSeries = scatterDataSeries

sciChartSurface?.renderableSeries.add(lineRenderableSeries)
sciChartSurface?.renderableSeries.add(scatterRenderableSeries)

}

func addModifiers(){
let xAxisDragmodifier = SCIXAxisDragModifier()
xAxisDragmodifier.dragMode = .pan
xAxisDragmodifier.clipModeX = .none

let yAxisDragmodifier = SCIYAxisDragModifier()
yAxisDragmodifier.dragMode = .pan

let extendZoomModifier = SCIZoomExtentsModifier()
let pinchZoomModifier = SCIPinchZoomModifier()

let rolloverModifier = SCIRolloverModifier()
let legend = SCILegendModifier()

let groupModifier = SCIChartModifierCollection(childModifiers: [xAxisDragmodifier, yAxisDragmodifier, pinchZoomModifier, extendZoomModifier, legend, rolloverModifier])

sciChartSurface?.chartModifiers = groupModifier

}

func brainwaveReceived(_ brainWave:Double){
let brainWave = brainWave * 3.3 / 65536
brainRateLabel.text = String(brainWave)
print(“brainwave: (brainWave)”)
}

}

extension HRMViewController: CBCentralManagerDelegate {
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {

case .unknown:
  print("central.state is . unknown")
case .resetting:
  print("central.state is . resetting")
case .unsupported:
  print("central.state is . unsupported")
case .unauthorized:
  print("central.state is . unauthorized")
case .poweredOff:
  print("central.state is . poweredOff")
case .poweredOn:
  print("central.state is . poweredOn")
  centralManager.scanForPeripherals(withServices:nil)
}

}

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
print(peripheral)
if peripheral.name == “MAESTRO1” {
// maestroPeripheral = peripheral
centralManager.stopScan()
maestroPeripheral = peripheral
maestroPeripheral.delegate = self
central.connect(maestroPeripheral)
}

}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print(“Connected!”)
maestroPeripheral.discoverServices([maestroServiceCBUUID])
}
}

extension HRMViewController:CBPeripheralDelegate{
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
guard let services = peripheral.services else {return}
for service in services {
print(service)
peripheral.discoverCharacteristics(nil, for: service)
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
guard let characteristics = service.characteristics else {return}

for characteristic in characteristics {
  print(characteristic)
  if characteristic.properties.contains(.read){
    print("\(characteristic.uuid): properties contain .read")
  }
  if characteristic.properties.contains(.notify){
    print("\(characteristic.uuid): properties contain .notify")
    peripheral.setNotifyValue(true , for: characteristic)
  }
}

}

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic,
error: Error?) {
switch characteristic.uuid {
case maestroBrainDataCBUUID:
let wave = Double(brainData(from: characteristic))*3.3/65536
createDataSeries(_brainwave2:wave)

  default:
  print("Unhandled Characteristic UUID: \(characteristic.uuid)")
}

}
private func brainData(from characteristic: CBCharacteristic) -> Int {
guard let characteristicData = characteristic.value else { return -1 }
let byteArray = UInt8

let firstBitValue = byteArray[0] & 0x01
if firstBitValue == 0 {
  // Heart Rate Value Format is in the 2nd byte
  return Int(byteArray[1])
} else {
  // Heart Rate Value Format is in the 2nd and 3rd bytes
  return (Int(byteArray[1]) << 8) + Int(byteArray[2])
}

}

}

Hello,

I am unable to install SciChart pod.
The podfile has multiple pods with multiple platforms and source.
I get the error saying ” [!] Unable to find a specification for ‘SciChart’.”
Please advice..

use_frameworks!

pod 'UICircularProgressRing'
pod 'Alamofire'

platform :ios, '8.0'
source 'https://github.com/CocoaPods/Specs.git'

pod 'SideMenu'

source 'https://github.com/ABTSoftware/PodSpecs.git'
pod 'SciChart', :git => 'https://github.com/ABTSoftware/PodSpecs.git'

Hi,
I am creating iOS aplication which displays charts based on stocks data.
I want to create box annotations to show when market is open or closed.
I am using CategoryDateTimeAxis to display data but when i add AnnotationCollection with BoxAnnotations to Surface i can not see the annotations.

This is my code for creating box Annotation:

    let pre = SCIBoxAnnotation()
    pre.coordinateMode = .relative
    pre.x1 = SCIGeneric(setDate(date, 4, 0, 0)!)
    pre.x2 = SCIGeneric(setDate(date, 9, 30, 0)!)
    pre.y1 = SCIGeneric(max )
    pre.y2 = SCIGeneric(0)
    pre.isEditable = false
    pre.style.fillBrush = SCISolidBrushStyle(color: #colorLiteral(red: 0.01680417731, green: 0.1983509958, blue: 1, alpha: 0.13))
    pre.style.borderPen = SCISolidPenStyle(color: .clear, withThickness: 0)

I’ve downloaded yesterday showcase example from your github: https://github.com/ABTSoftware/SciChart.iOS.Examples

After providing license key other samples work ok except Audio Analyzer (and the last sales dashboard – shows blank screen).

Problems is somewhere with SpectrogramSurfaceController ( If I commend it out wave plot and fft plot works)

Xcode shows there is some bad memory access at:
[SCIFastUniformHeatMapRenderableSeries internalDrawWithContext:WithData:]
cblas_sscal

Tested using:
iPhone 5SE
iOS 11.2.5
Xcode 9.2

When I embed my view controller in a navigation controller the top of the chart is hidden behind the navigation bar. So I went to the storyboard and found the view controller attributes section called “extend edges” and turned off the option called “under top bars”. This fixes the top of the chart. Now the bottom of the chart drops off the bottom of the screen. The x-axis is completely missing. Does SciChart support this case?

I need someone to develop this chart for me and I will provide a JSON, for the data.

https://www.youtube.com/watch?v=t29Zl-7QyMw&t=215s
Please go to time line 3:22

I have been struggling in the documentation and if someone can create this chart for me, I will be more than happy to pay you.

The chart would have to be created for Swift 4 please.

Robert

I have a Xamarin forms Project with one page of my app containing a SciChart. On that page, I have a RelativeLayout.

In the code behind for that page, I pass my layout to a dependency service method which adds the SciChartSurface to it depending on the platform. This has tested well on various Android platforms.

For iOS, I’ve tested on a device running iOS 9 and simulators running 9, 10, and 11. And any run less than 11 does not display. The view is simply blank.

Here’s the code where I add the SciChartSurface to the view.. I’m still new to SciChart, so I’m not sure if I’m doing everything totally correct.

public void renderSciChart(Xamarin.Forms.RelativeLayout masterLayout, Xamarin.Forms.RelativeLayout topLayout)
    {


        SciChart.iOS.Charting.SCIChartSurface Surface = new SciChart.iOS.Charting.SCIChartSurface();
        Surface.TranslatesAutoresizingMaskIntoConstraints = true;
        SciChart.iOS.Charting.XyDataSeries<double, double> dataSeries = new SciChart.iOS.Charting.XyDataSeries<double, double>();
        //generateDataPoints(dataSeries);
        var xAxis = new SciChart.iOS.Charting.SCINumericAxis{/*GrowBy = new SciChart.iOS.Charting.SCIDoubleRange(0.1, 0.1), VisibleRange = new SciChart.iOS.Charting.SCIDoubleRange(1.1,2.7)*/};
        var yAxis = new SciChart.iOS.Charting.SCINumericAxis();
        var renderableSeries = new SciChart.iOS.Charting.SCIFastLineRenderableSeries { DataSeries = dataSeries, StrokeStyle = new SciChart.iOS.Charting.SCISolidPenStyle(0xFF279B27, 2f) };
        using (Surface.SuspendUpdates())
        {
            Surface.XAxes.Add(xAxis);
            Surface.YAxes.Add(yAxis);
            Surface.RenderableSeries.Add(renderableSeries);
            Surface.ChartModifiers = new SciChart.iOS.Charting.SCIChartModifierCollection
            {
                new SciChart.iOS.Charting.SCIZoomPanModifier(),
                new SciChart.iOS.Charting.SCIPinchZoomModifier(),
                new SciChart.iOS.Charting.SCIZoomExtentsModifier(),
            };
        }

        masterLayout.Children.Add(Surface.ToView(),
        widthConstraint: Constraint.RelativeToParent(parent => parent.Width),
        heightConstraint: Constraint.RelativeToParent(parent => parent.Height * 0.5),
        yConstraint: Constraint.RelativeToView(topLayout, (RelativeLayout, element) => element.Height));
    }

Additionally, here’s a Screenshot of the same code running on a simulator with iOS 10 (Left) and iOS 11 (Right).

Could I have a date please.

is it possible for the December or more likely for January?
robert

https://www.scichart.com/documentation/ios/v2.x/Tutorial%2002%20-%20Creating%20a%20SciChartSurface.html

Can someone please point me to where I can complete this tutorial.

Why end this tutorial like this??

// That’s it! The SCIChartSurface will now display on the screen with default axis ranges

As is, it simply displays the x and y values. Nothing else.

How can I add my x and y values so that I can display my graph

Hi!
I am going through the showcase example for the spectrogram and I had a confusion on the sizeX and Y parameter of SCIUniformHeatmapDataSeries. Are these sizes as per the width and height of the surfaceChart ? I am going to plot an array of data. How do I determine the correct sizes for X and Y.
Moreover, is it necessary that the size array used for updating the dataSeries has to be (xSize*ySize)?

I’m attempting to integrate some of the tutorial swift code into my app and I’m getting stuck on this error. Seems like some macro isn’t running.

“Use of unresolved identifier ‘SCIGeneric'”

Code is like this: lineDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(sin(Double(i))*0.01))

I’ve done “import SciChart” and most things seem to work fine except this. Any ideas? Thanks

Hi, guys

Please take look at:
http://prntscr.com/gmmib5

So my question is

Is there a way to highlight a line of a gridlines to which the label belong? It can be a color changed or something similar that can be easily perceived by the user.

Best regards,
Sushynski Andrei

Hi, guys

I’m very sad because of you.

On my chart i’m added SCIZoomPanModifier with clip mode SCIClipMode_ClipAtExtents. And it well worked before i have updated lib to ‘2.0.1.1748’. Now it’s works the same way as SCIClipMode_StretchAtExtents. But i don’t want to zoom by scrolling at the edge of data.

Can you look at it and fix as soon as possible?

Best regards,
Sushynski Andrei

Hello,
I’m following along with the tutorial. I installed using the pod. I am at the end of Tutorial 3 and am getting an error. Use of unresolved Identifier ‘SciGeneric’. I can see I have the wrapper file in my project. Any Ideas what I’m doing wrong?

Thanks
Warren

Hi everyone,

I have a scroll view containing (among others) subviews with SciChart surfaces. I use this method:

 [self.scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];

… to take a screenshot of the whole scroll view (render it as a UIImage). All charts are rendered as black rectangles. Same thing happens if I use “Capture view hierarchy” in XCode – black rectangles where there should be a chart.

Any ideas?

Hello!

I am building an iOS framework that sits on top of SciChart for app developers within our company. I’d like to provide my own default SCIThemeColorProvider object for charts in my framework. Easiest way to do that is to include my own theme plist in my framework’s bundle, but I cannot currently do that (as of 2.0.0.1643) because the SCIThemeColorProvider initializer assumes it’s either in the “Charting.SciChart” bundle or the main bundle.

I’d like to propose modifying SCIThemeColorProvider to add another initializer that takes a bundle ID, like this:

/**
 * Creates theme provider based on specified style
 *
 * @param themeKey The key of style which should be used as base for this theme provider
 *
 * @param bundleIdentifier The identifier of the bundle containing the theme plist identified by 
 *                         themeKey; if nil, the main bundle is used.
 */
- (nullable instancetype)initWithThemeKey:(nonnull NSString*)themeKey bundleIdentifier:(nullable NSString*)bundleIdentifier;

The existing -initWithThemeKey: initializer would call through to this initializer with a nil bundle ID.

I have attached a patch file with this proposed change. Could this be added to an upcoming build?

Hi, guys

My x axis is SCICategoryDateTimeAxis and i’m want to draw grid line with custom period. Let’s say every four hours for data with a period of thirty minutes. What is the best way for that?

Can i redifined axis’s tickCoordinatesProvider?
Can you provide some example?
Or it only possible with axes annotations ?

Best regards,
Sushynski Andrei

Hi, guys

Is there something similar like

• (void)bringSubviewToFront:(UIView *)view;
• (void)sendSubviewToBack:(UIView *)view;

from UIView but for chart Annotations?

Best regards,
Sushynski Andrei

On device, there is an unwanted border line on the SCIChartSurface. Please refer to the screenshot.

I tried removing this by setting the border width and setting it’s colour as white as below
self.surface.view.layer.borderColor = [[UIColor whiteColor]CGColor];
self.surface.view.layer.borderWidth = 2.0f;
However, this does not set the border of the SCIChartSurface.

How do I remove this unwanted border line?

Hey everyone,

SCIThemeColorProvider has styling properties for individual types of chart elements (annotations, axes, grid lines, renderable series). How can multiple colours be assigned to individual RenderableSeries in case there are more than one?

For example, a stacked column chart will surely have more that one data series and it appears that current implementation of SCIThemeColorProvider doesn’t take this into account from architectural point of view.

Am I missing something?

Thanks,
Igor

Hi, guys

Is it possible to use negative index for methods:

-(void) insertAt:(int)index X:(SCIGenericType)x Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

-(void) updateAt:(int)index Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

Can you give an answer?

Best regards,
Sushynski Andrei

Hi, guys

What is the minimum required sdk version for SciChart v.2?

Such as i have some trouble with IOS 9. See attachment.

Same behavior at real devices.

Can you look at this?

Best regards,
Sushynski Andrei

Hi, guys

Is it possible to set min and max zoom constraints for renderable serie with one element ?
Default value (default_zoom.PNG) is too big.

Can you look at this?

Best regards,
Sushynski Andrei

Hi, guys

I’m interesting in alignment for line at SCIAxisMarkerAnnotation. For example for top, middle and bottom position. Like at alignment_to_top.png. So is there some possibility for this?

UDP: Is there possibility to hide annotation from chart view?
Something like setHidden: for UIView.

Best regards,
Sushynski Andrei

Hi, guys

I want to show two renderableSeries on one chart view. These series have common x-axis (SCICategoryDateTimeAxis) and separate y-axes(SCINumericAxis). Only one of y-axis is visible at chart view. Also the data series of visible renderable series updated by scrolling to left or to right. So for displaying on one view i’m using:

[y1Axis setGrowBy: [[SCIDoubleRange alloc] initWithMin:SCIGeneric(0.3) Max:SCIGeneric(0.07)]];
[y2Axis setGrowBy: [[SCIDoubleRange alloc] initWithMin:SCIGeneric(0.0) Max:SCIGeneric(5)]];

So it’s look good at start (Correct_zooming.png). But after some scrolling it decrease axis extents of invisible y-axis (decrease.png).
Or even breaks down (broken.png)

For test i’m using SCIFastOhlcRenderableSeries and SCIHorizontallyStackedColumnsCollection readerable series.
Data series for SCIHorizontallyStackedColumnsCollection is initializated like:

    [volumeSerie1 updateAt:index Y:SCIGeneric(100000 / [multiplier doubleValue])];
    [volumeSerie2 updateAt:index Y:SCIGeneric(500000 / [multiplier doubleValue])];

So can you look at it?
Or what way i should implement this behavior?

Best regards,
Sushynski Andrei

Hi, guys

My axis is SCICategoryDateTimeAxis type. And using SCIZoomPanModifier (SCIClipMode_ClipAtExtents) to scroll chart

I’m using setVisibleRangeLimit: method to clip the axis during ZoomExtents

Until v. 2.0.0.1511 it’s work like a charm. But now something had have broken. And it’s doesn’t allow me to scroll chart at right way. It show me all of the data range on chart or only left side.

So can you fix it?

Best regards,
Sushynski Andrei

Hi, guys

Is Stacked Columns support autoRange by visible range?

I’m interesting in because sometimes my data looks like at the screenshot “huge_data.png”

And even when i have scrolled outside this data it’s looks like at the screenshot “scrolled_outside.png”

Best regards,
Sushynski Andrei

Hi, guys

My X axis is SCICategoryDateTimeAxis type.

And i have a huge amount of data to display. So i need to display it by scrolling of the chart surface.
So what is the best practice to update data series on the fly and display it at the chart surface?

Best regards,
Sushynski Andrei

I am plotting a line chart and in it I have a requirement to plot different sets of points in different colours. How can I achieve this ?

I am setting the colour as below

[[(SCIFastLineRenderableSeries*)self.renderableSeries style] setLinePen: [[SCIPenSolid alloc] initWithColor:[UIColor redColor] Width:1]];

However, this sets the colour for the whole data series in line chart.

I have attached the screenshot of the desired output.

Hi, guys

Is it possible to draw axis line at axis area? See attachment.