Questions

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?

Hi everyone,

What would be the easiest way of shading all vertical bands for weekend days? I’ve got two ideas:

1. Setting major band brush won’t work because there’s no way of setting only weekend bands to be major bands (as far as I know).
2. Using box annotations.

Problem with 2nd option is that annotations are rendered over the chart (screenshot attached). Is there a way of sending them behind columns?

Thanks,
Igor

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.

Hi guys,

I am having difficulties setting the background of my bar chart with SCICategoryDateTime X axis since I switched to 2.0.

As far as I understand, just setting the background property of the SCIChartSurface should suffice.
These are all of the things I’ve tried:

1. [self.barSurface setBackgroundColor:[UIColor clearColor]];
2. [self.barSurfaceView setBackgroundColor:[UIColor clearColor]]; 
3. self.barSurface.renderableSeriesAreaFill = [[SCISolidBrushStyle alloc] initWithColor:[UIColor clearColor]];
4. [self.barSurface.renderSurface setIsTransparent:YES];

I didn’t find any other way of setting it, but it still remains black. Any thought on what might cause it?

EDIT: I just found out about this color setting:

[axisStyle setGridBandBrush:[[SCISolidBrushStyle alloc] initWithColor:[UIColor whiteColor]]];

The result I got was a black and white chess board, as shown on the attached picture. I really don’t understand this behaviour. If I set this gridBandBrush to nil, columns are coloured with random colours, so the chart looks like a rainbow. I understand why is this happening but shouldn’t there be a default colour in case brush is nil?

EDIT 2: While debugging using “Capture view hierarchy” in XCode I discovered that render surface is actually white inside debugger. Perhaps it will give more insight to you, it doesn’t mean much to me – I guess it’s because rendering is done on GPU and the context is not available to the debugger.

Best,
Igor

Hey guys,

Starting from 2.0 we can have dashed lines in renderable series. I was wondering can we have dashed line annotations as well?

I tried this:

verticalLineAnnotation.style.linePen = [[SCIPenDashed alloc] initWithColor:[UIColor redColor] width:2 withStrokeDashArray:@[@(10.f),@(3.f)]];

and got this build error:

Assigning to 'SCIPenStyle *' from incompatible type 'SCIPenDashed *'

Isn’t SCIPenDashed a SCIPenStyle?

Best,
Igor

Hi, guys

I have some data series like:

[[SCIXyDataSeries alloc] initWithXType:SCIDataType_DateTime
                                 YType:SCIDataType_Double
                             SeriesType:SCITypeOfDataSeries_XCategory];

Also my Y axis is kind of class SCINumericAxis

So my question is

if i’m trying add value to the series

[volumeSerie appendX:SCIGeneric(bar.time) Y:SCIGeneric([bar.volume doubleValue])];

and my bar.volume is bigger than 2 147 483 648 (float limit as i’m know). It’s leads to a axis range crash. Like on the attached image.

So what should i use to handle huge values?
Like a billions and more

Best regards,
Sushynski Andrei

1. Is it possible to display the peak value instead of X and Y values at touch point using a modifier ? If so, how can I achieve this ? (Both Rollover and Cursor modifier only shows the X and Y values)

2. In real time chart, since the values are updating continuously, the cursor modifier is constantly disappearing and appearing and is not stationary. How can I keep the cursor modifier always visible ?

Hi, guys

My x axis is SCICategoryDateTimeAxis class type. And it’s limited by VisiableRangeLimit like:

[xAxis setVisibleRangeLimit:[[SCIDoubleRange alloc] initWithMin:SCIGeneric(firstItem – (lastItem – priorItem))
Max:SCIGeneric(lastItem + (lastItem – priorItem))]];

Also for scrolling my content inside chart:

SCIZoomPanModifier * zpm = [[SCIZoomPanModifier alloc] init];
[zpm setModifierName:@"PanZoom Modifier"];
[zpm setClipModeX:SCIZoomPanClipMode_ClipAtExtents];

Like a description SCIZoomPanClipMode_ClipAtExtents says:
“forces the panning operation to stop suddenly at the extents of the data” – but it’s not working constantly.
Sometimes it’s allow to scroll outside the range. Like on the attached image.

So my question is how to limit scrolling by min and max value?

Best regards,
Sushynski Andrei

Hi!

I tried implementing pinch zooming for real time chart in the demo project(FIFO Performance Demo and ECG Monitor Demo) and found that it’s not possible.

I used the following code:

self.surface = [[SCIChartSurface alloc] initWithView: self.sciChartSurfaceView];
SCIPinchZoomModifier * pzm = [[SCIPinchZoomModifier alloc] init];
[pzm setModifierName:@”PinchZoom Modifier”];
self.surface.chartModifier = pzm;

If it is so, then how can I achieve it ?

Hi,

I am trying to get the index of a specific date in CategoryDateTime X axis. I was trying to use this approach:

int idxOfMaxAvgScoreDate = [[self.dataSeriesAvg xValues] indexOf:SCIGeneric(dateOfMaxAvgScore) IsSorted:YES SearchMode:SCIArraySearchMode_Exact];

but it was returning -1. My guess is that comparison operator for the DateTime type is “too precise”, so some kind of range check needs to be done, similarly to common practice when comparing two floats:

if (abs(float1-float2) < epsilon)

instead of

if (float1 == float2)

I tried using SCIArraySearchMode_Nearest, but without success – most of the times I get a column right after the one I need (desiredIndex+1).

While trying to implement index lookup myself by iterating through the dataSeries.xValues I noticed that DateTime type decoder is not there for individual elements of SCIArrayControllerProtocol. Autocompletion for line below

[[self.dataSeries xValues] valueAt:i].

offers all typed of data decoding (int16, int32, char…) except dateTime. Is this the way it is supposed to be?

I tried solving it this way:

SCIGenericDate([[self.dataSeries xValues] valueAt:i])

but the date I am getting is always 01-01-1970. This indicates that entries in the X axis are not DateTime elements, which is not true, since this is my X axis:

id<SCIAxis2D> xAxis = [[SCICategoryDateTimeAxis alloc] init];

Any help, or even just thoughts and comments, would be highly appreciated.

Thanks,
Igor

Hello again! 🙂

This time I am trying to draw marker for a maximum numeric data value in chart with CategoryDateTime X axis.

I have my X axis defined like this:

id<SCIAxis2D> xAxis = [[SCICategoryDateTimeAxis alloc] init];

and I am trying to draw a marker in draw() method of a custom modifier using this code:

 id<SCIRenderPassData> data = [_rSeries currentRenderPassData];
 id<SCICoordinateCalculator> xCalc = [data xCoordinateCalculator];
 id<SCICoordinateCalculator> yCalc = [data yCoordinateCalculator];
 NSLog(@"Is category calc: %d", [xCalc isCategoryAxisCalculator]);
 double xCoord = [xCalc getCoordinateFromDate:_xValue];
 double yCoord = [yCalc getCoordinateFrom:_yValue];
 [_marker drawToContext:context AtX:xCoord Y:yCoord];

My _xValue is computed and set from outside and is for sure is a valid date on X axis for which I need to draw the marker on.

My problem is that:

1. xCoord is always 0.
2. NSLog line prints 0 to debug console, meaning that xCalc is not CategoryAxisCalculator. I suspect this is why xCoord is always 0.

My questions are:

1. Am I trying to compute xCoord the right way? I need it for drawing the marker and I have a date for which I want marker to be placed on.
2. Why [data xCoordinateCalculator] returns something that is not CategoryAxisCalculator even though my axis is a category axis? Is this expected behaviour?

Looking forward to your always useful reply. 🙂

Hi,

I’m trying to achieve the looks of DateTimeCategory XAxis as shown on uploaded screenshot.

Formatting a single row of tick labels is not a hard task (setTextFormatting). The problem arises when there are 2 rows with same frequency (days of the week and dates) and third row with lower frequency (years).

I tried using new line character in text formatting property to break the line for days and dates and it didn’t work. I also tried having two axes bound to the same data series, each one having different formatting and majorDelta, but it seems that they don’t stack up (only first one added is shown).

Any ideas?

Hi,

I have understood that you will start supporting macOS in the near future. Are we talking Q3, Q4 or 2018?

Any hint, even one with lots of caveats will be greatly appreciated…

Thanks
/Peter

Hi there.

It’s has been asked here:
https://www.scichart.com/questions/question/custom-annotation

So, Is it possible to draw dashed line annotation at the current version 1.2.3.982?

Best regards,
Sushynski Andrei

Hi, guys

Is there possibility to show tooltip by simply changing switch at the settings?
Not by tapping at the chart area as it implemented now.

Best regards,
Sushynski Andrei

Hi, guys

I’m working with SCIDateTimeAxis type of the X-axis. So my question Is there possibility of skipping non-value period?

Best regards,
Sushynski Andrei

Hi, guys

it seems that i had found a mistake:

At SCICursorModifierStyle class if i try to set up axisVerticalTooltipCornerRadius property it lead to changing of axisHorizontalTooltipCornerRadius

Please take a look

Best regards,
Sushynski Andrei

Hi,

I’m trying to limit the x-axis panning up to an annotation that I’ve drawn on the graph. This annotation can be beyond the current data’s position (i.e. data’s timestamp is at 5/4/2017 11:00:00, annotation’s position is at 5/4/2017 16:00:00). Is there a method, or any way that I can use to limit the x-axis panning up to the annotation’s position instead of limiting it to the data series’ max X?

Regards.

Hi,

Please take a look at the attached screenshot first.

I have a chart configured to draw some data. I need to draw SCIAxisMarkerAnnotation on Y axis. And it seems that annotation has alignment by right side of axis area. Is there a possibility to change it to left side of axis area?

Hi,

I’ve encountered an issue with the candlestick graph I’ve drawn that consists of a set of random X date time values – this causes the candlesticks have varying distances from one another.

Rendering the data from an initial set seems to be fine but as I run a NSTimer to add on more points, the body of the new candlesticks seem to be 0. (Note, the date time values are still random but have been made to be set after the last placed point)

In fact, the initial data points that I added see to be rendered ‘body-less’ if it’s within the same visible range as the newly added points. And if I pan along the newly added points, the bodies of some data points will appear at random visible ranges.

Is this a normal behaviour or should I take anything else into consideration?

Here are a couple of my configurations which I think may have affected anything:
1. My XAxis has set its visible range limit mode to ClipMode_Min
2. Candlestick series style data body width is set to be default.
3. I have a the following modifiers set up.

self.xDragModifier = [SCIXAxisDragModifier new];
self.xDragModifier.axisId = @"xAxis";
self.xDragModifier.dragMode = SCIAxisDragMode_Pan;
self.xDragModifier.clipModeX = SCIZoomPanClipMode_ClipAtMin;
[self.xDragModifier setModifierName:@"XAxis DragModifier"];

self.pinchZoomModifier = [[SCIPinchZoomModifier alloc] init];
[self.pinchZoomModifier setModifierName:@"PinchZoom Modifier"];
self.pinchZoomModifier.xyDirection = SCIXYDirection_XDirection;

self.zoomPanModifier = [SCIZoomPanModifier new];
self.zoomPanModifier.clipModeX = SCIZoomPanClipMode_ClipAtMin;
self.zoomPanModifier.xyDirection = SCIXYDirection_XDirection;
[self.zoomPanModifier setModifierName:@"ZoomPan Modifier"];

SCIModifierGroup * gm = [[SCIModifierGroup alloc] initWithChildModifiers:@[self.xDragModifier, self.pinchZoomModifier, self.zoomPanModifier]];
self.chartSurface.chartModifier = gm;

The points are drawing just fine, but the body of the candlestick is not appearing as expected.

Thanks in advance.

It would be nice to have an access to repo through CocoaPods. You can create a private spec repo and share with developers. https://guides.cocoapods.org/making/private-cocoapods.html