Questions

Hi all,

I’m trying to use the metal support in a little test project.
I have following lines to enable metal:

if SCIChartSurface.isMetalSupported {
      sciChartSurface.renderSurface = SCIMetalRenderSurface(frame: sciChartSurface.bounds)
 } else {
       sciChartSurface.renderSurface = SCIOpenGLRenderSurface(frame: sciChartSurface.bounds)
 }

the surface keeps empty until I remove the

sciChartSurface.renderSurface = SCIMetalRenderSurface(frame: sciChartSurface.bounds)

line – or in other words I use OpenGL.
Then the chart will render properly. I am using an iPhoneX (not simulator).

Thank you for your support!

Wall of Code:

import UIKit
import SciChart
import SnapKit

class ViewController: UIViewController {

    // MARK: - UIElements
    private var sciChartSurface: SCIChartSurface!

    // MARK: - Vars
    private var series: SCIXyDataSeries?

    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        setupSurface()
        setupData()
        renderData()
    }

       // MARK: - Chart
     private func setupSurface() {
        // Create a SCIChartSurface. This is a UIView so can be added directly to the UI
        sciChartSurface = SCIChartSurface.init(frame: view.bounds)
        sciChartSurface.debugWhySciChartDoesntRender = true
        view.addSubview(sciChartSurface)

        // Detect metal with this static property
        if SCIChartSurface.isMetalSupported {
            sciChartSurface.renderSurface = SCIMetalRenderSurface(frame: sciChartSurface.bounds)
        } else {
            sciChartSurface.renderSurface = SCIOpenGLRenderSurface(frame: sciChartSurface.bounds)
        }
        sciChartSurface.snp.makeConstraints { (make) in
            make.edges.equalToSuperview()
        }

        sciChartSurface.translatesAutoresizingMaskIntoConstraints = true
        sciChartSurface.backgroundColor = .gray
        // Create an XAxis and YAxis. This step is mandatory before creating series
        let xAxis = SCICategoryNumericAxis()
        setup(axis: xAxis)
        sciChartSurface.xAxes.add(xAxis)
        let yAxis = SCINumericAxis()
        setup(axis: yAxis)
        sciChartSurface.yAxes.add(yAxis)
    }

    private func setup(axis: SCIAxisBase) {
        let axisStyle = SCIAxisStyle()

        let majorPen = SCISolidPenStyle(colorCode: 0xFF393532, withThickness: 0.5)
        let minorPen = SCISolidPenStyle(colorCode: 0xFF262423, withThickness: 0.5)

        let textFormat = SCITextFormattingStyle()
        textFormat.fontSize = 16

        axisStyle.majorTickBrush = majorPen
        axisStyle.majorGridLineBrush = majorPen
        axisStyle.gridBandBrush = SCISolidBrushStyle(colorCode: 0xE1232120)
        axisStyle.minorTickBrush = minorPen
        axisStyle.minorGridLineBrush = minorPen
        axisStyle.labelStyle = textFormat
        axisStyle.drawMinorGridLines = true
        axisStyle.drawMajorBands = true
        axis.style = axisStyle
    }

    private func setupData() {
        series = SCIXyDataSeries(xType: .int16, yType: .int16)
        TestData.testData.forEach { (testData) in
            let xGeneric = SCIGenericType(type: .int16, .init(int32Data: testData.x))
            let yGeneric = SCIGenericType(type: .int16, .init(int32Data: testData.y))
            series?.appendX(xGeneric, y: yGeneric)
        }
    }

    private func renderData() {
        let renderSeries = SCIFastColumnRenderableSeries()
        renderSeries.dataSeries = series
        sciChartSurface.renderableSeries.add(renderSeries)
    }
}



struct TestData {
    var x: Int32
    var y: Int32

    static let testData = [TestData(x: 2017, y: 5),
                           TestData(x: 2018, y: 8),
                           TestData(x: 2019, y: 2),
                           TestData(x: 2020, y: 9)]
}

Hello

is there a way to set the padding (aka reduce the gap) between bars in a SCIFastColumnRenderableSeries?

I attach a screenshot of my current situation: I would like to have zero margin between columns.

I tried searching in the knowledge base but all the answers I found seem to refer to APIs not available in the iOS SDK

• SciChartSurface without paddings (https://www.scichart.com/questions/wpf/how-to-draw-a-pixel-x-millemeter)
• Reduce Chart Padding (https://www.scichart.com/questions/wpf/reduce-chart-padding)

.

There is not such class method in the iOS SDK called SciChartSurface.Padding

Thanks for your help

I’m try to generate a UIImage from a SCIChartSurface into a graphic context using the code below from a view that is not displayed on the screen. The image created is pure black, which indicates it did not draw. If I display the graph in a view on the devices screen, the graph draws correctly.

UIGraphicsBeginImageContextWithOptions(self.chart.bounds.size, NO, 0.0);
[self.chart drawViewHierarchyInRect:self.chart.bounds afterScreenUpdates:YES];
UIImage *chartImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Are there any special steps that are needed to draw into a graphic context?

Is there a way to provide custom text for the labels in a PieChartSegment? I want to format the text, but haven’t been able to find a label formatter for the pie charts.

How can I hide the default segment value label drawn automatically?
I need the solution for both iOS and Android version.

I’m trying to create a Modifier for a PieChart Surface. I can not figure out how to get a segment for a point on the screen. With SciChartSurface, you can get the axis, and use its calculator to get a datapoint, or pixel point. Is there something similar in SciPieChartSurface?

I’m trying to accomplish 2 things:

First is that I would like to not be able to zoom out past the data, it does no good to zoom out if there is no more data to see. It would also be nice to have a little bounce/spring back if you zoom to far, like when zooming out on an image on an iPhone.

The second is that I only want to be able to pan to the data. If zoomed all the way out, then trying to pan would do nothing. If zoomed in you should be able to scroll around, but only to the end of the data.

I believe I have the first one accomplished by setting the maximalZoomContrain to be the same as the data range, although this doesn’t allow any kind of bounce.

What need to be done to make this work, this seems like a feature that is built into the SciChart Modifiers.

I want to modify SCICursorModifier in such a way that while user is doing pan gesture in x direction the line should always be in the centre of candlestick. How can i achieve this. For example there are 3 candlestick visible while panning from 0th x co-ordinate vertical line should be in the centre of first candlestick on more panning it will go to the centre of 2nd candlestick like rollover modifier

I was able to add multiple y axis and able to fill data on different y axis but the problem is all the y axis are overlapping. What I want is how can I segregate y axes in such a way that they should appear one below the other in the same surface. I tried adding two different surface but then I am not able to add single cursorModifier to both surface. Our android developers had used something called YAxisStackedLayoutStrategy to achieeeve this is there any equivalent class for iOS

I’m trying to add annotations on a chart but they are rendering above my legend.

Initially (similar to most of the demo code I’ve seen), I setup my modifiers, then created my series and animated them in — then added my annotations (adding to annotationGroup). This created a timeline of blank chart surface with legend (good so far), annotations popping in before the chart series animated in (weird / not good) and on TOP of the legend (really bad), then the animation of the series after that.

I’ve tried about everything I can think of and the best I’ve been able to do is use a completion block of the animation rendering the series — and moved my chart modifiers (and legend) into that completion block. If I put the annotations in the completion block, they will render after the chart modifier and I have the same problem (even if placed after the chart modifiers). I have to set the annotations before the animation, and then the chart modifier in the completion block will work and the legend will be above the . Of course, this is a bit odd too — as first my annotations pop up by themselves on the blank surface, followed by my series animating in, then at the end of the 2 second animation, the legend just pops in.

I really would like my legend to be rendered first on the blank surface and the annotations and chart series to animate in together under my legend. I’m gathering that’s unlikely (at least the animation part) — but is there anyway I can place my legend first and still have the annotations go under it? It feels like the layers should be: modifiers > annotations > rendered series. I also I’ve read this order before in some WPF docs I believe, but doesn’t seem to be respected on iOS?

UPDATE: My current work around isn’t sufficient because I really need access to the renderable series to create the annotations which means I really can’t defer my chart modifiers (i.e. legend) until after the annotations. Additionally, if I need to update (remove / re-add) an annotation due to a series being deactivated in the legend, now my annotations are on top of the legend again.

I am placing annotations at the top of every bar in a stacked bar graph (and a standard bar graph on another screen) showing the total of all the stacked bars by iterating through my data, generating the sum, and placing it at the correct x,y (an incredibly manual process that seems like there should be much easier to do but I found no other way to do it – if there is a better way, I would love to hear it, but that’s a secondary issue and not my current problem).

I also have a legend where the user can select / deselect series.

When the user selects/deselects a series from the legend, I need to hide all my annotations and then recreate them because the sums of the stacked bars has changed (or if no bars are showing, remove my annotation completely). My assumption is I could reiterate through my data and check series to see if they are visible (isVisible) and recalculate the sums and recreate the annotations (another very manual process but I can probably work it out).

My primary problem is I see no way for me to intercept that this legend event occurred. The series get hidden internally and I never have a chance to do anything with the annotations. It seems like this may be doable on other platforms but I’m at a loss on iOS. There is no delegate / block event handler / etc.

Any thoughts?

Hi guys,

Is it possible to capture the tap event when we tap on a point marker or a data point? I can see there’s a DataPointSelectionModifier for WPF, but there’s nothing for iOS. Our goal is to show a popup (tooltip) on the point marker when the user taps on it.

Thanks,
Lazar Nikolov

i want to insert 500 data on the left of chart.
then, it freezes slightly.
so, i want to present indicator.
how can i listen to start and end of drawing?

Hello, I’m trailing your library right now. I would like to be able to move the graph around as well as a cursor on the graph. So I enabled both SCIZoomPanModifier and SCICursorModifier. But since both use one finger panning, the result wasn’t that good. Do you have any guidance for solving the conflict and letting them working together? I’m thinking to do it in the following way: if the touch location is within certain pixel range of the cursor, panning action will move the cursor, otherwise it moves the graph. Is it possible? Thanks

Hello, I’m trailing your library right now. I’m wondering how to change the background color of the legend box. The document page for LegendModifier shows coming soon. I don’t see such option in LegendModifier definition in Xcode either. Thanks

Andrew required swift code so I attach the code.
Please answer my question again.

https://www.scichart.com/questions/question/customize-chart-designwith-pic
https://www.scichart.com/questions/question/cannnot-remove-weird-square-areas

Andrew answered second question, but it didn’t work.
There is no drawAxisBands.

registerVisibleRangeChangedCallback is not enough for me.
I want an active stop function like this.
surface.stopScroll()….

yAxis.textFormatting = “%f”
First image file is the result of this code.

yAxis.textFormatting = “0.00000000”
Second image file is the result of this code.

First code doesn’t work, even it is just a sample code in document.
Second code works, but I want flexible trailing zeros.
How can I do?

I wanna make chart area background color white.
And I implemented it like below.

surface.xAxes.defaultAxis()?.style.gridBandBrush.color = .white
surface.yAxes.defaultAxis()?.style.gridBandBrush.color = .white

Then, some part became white, but not whole area.
I wanna remove those black areas, so I used theme manager, and it worked.

SCIThemeManager.applyTheme(toThemeable: surface, withThemeKey: “SciChart_Bright_Spark”)
surface.xAxes.defaultAxis()?.style.gridBandBrush.color = .white
surface.yAxes.defaultAxis()?.style.gridBandBrush.color = .white

But, this is not reasonable. I use that theme, only to change background color.
Is there another way to acheive white background?

When scrolling, some weird bold lines appear and disappear.
You can see it on image files attached.
How can i fix it?

How would I go about doing this in swift?

Have recently converted to xcode 10 and swift 4.2.

Am now receiving this error message on build.

SciChart.framework/SciChart
Reason: no suitable image found. Did find:
/usr/lib/libstdc++.6.dylib: mach-o, but not built for iOS simulator

Any ideas?

Hi Sir/Madam,
I have created a Mountain Series with gradient fill. below is part of my code:

-(SCIRenderableSeriesBase *)getTimeSharePlot:(SCIXyDataSeries*)xySeries{
    SCIFastMountainRenderableSeries * rSeries = [SCIFastMountainRenderableSeries new];
    rSeries.dataSeries = xySeries;
    rSeries.strokeStyle = [[SCISolidPenStyle alloc] initWithColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:1] withThickness:1];
    rSeries.areaStyle = [[SCILinearGradientBrushStyle alloc] initWithColorStart:[UIColor colorWithRed:32/255.0 green:56/255.0 blue:124/255.0 alpha:1.0] finish:[UIColor whiteColor] direction:SCILinearGradientDirection_Vertical];

    return rSeries;
}

When i run the test, the chart is just filling with solid color
Would you please help?
BR,
Tommy

Hi

I am developing a Xamarin iOS application and I’m using a SCIPieChartSurface. I can create the chart and set its values, but it is not possible to auto-update the donut with new data.
I am trying to update the value by doing:

myDonut.MyPieSegment.Value = newValue;

But nothing happends…