iOS Charting Documentation - SciChart iOS Charts SDK v3.x

The Column Series Type

Column Chart is provided by the SCIFastColumnRenderableSeries class. It accepts data (X, Y) from a SCIXyDataSeries and renders a column at each [X, Y] value.

NOTE: Examples for the Column Series can be found in the SciChart iOS Examples Suite as well as on GitHub:

The SCIFastColumnRenderableSeries class allows to specify Fill brush, Stroke pen and relative DataPointWidth which will be applied to every column. You can also choose the SCITextureMappingMode for Fill brush which defines how columns are filled when a gradient is used. The DataPointWidth specifies how much space a single column occupies, varying from 0 to 1 (when columns are conjoined).

NOTE: To learn more about Pens and Brushes and how to utilize them, please refer to the SCIPenStyle, SCIBrushStyle and SCIFontStyle article.

Also, it is possible to define the ZeroLineY baseline position via the SCIRenderableSeriesBase.zeroLineY property. All data points that have Y value less than ZeroLineY will appear downward, else - upward.

All those values can be assigned via the corresponding properties:

NOTE: In multi axis scenarios, a series has to be assigned to particular X and Y axes. This can be done passing the axes IDs to the ISCIRenderableSeries.xAxisId, ISCIRenderableSeries.yAxisId properties.

Create a Column Series

Column Series Type

To create a Column Series, use the following code:

// Assume a surface has been created and configured somewhere id<ISCIChartSurface> surface; // Create DataSeries and fill it with some data SCIXyDataSeries *dataSeries = [[SCIXyDataSeries alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double]; // Create and add Mountain Series id<ISCIRenderableSeries> columnSeries = [SCIFastColumnRenderableSeries new]; columnSeries.dataSeries = dataSeries; columnSeries.strokeStyle = [[SCISolidPenStyle alloc] initWithColorCode:0xFFA99A8A thickness:1.0]; columnSeries.fillBrushStyle = [[SCILinearGradientBrushStyle alloc] initWithStart:CGPointMake(0, 0) end:CGPointMake(0, 1) startColorCode:0xFF4682B4 endColorCode:0xFFB0C4DE]; [surface.renderableSeries add:columnSeries];
// Assume a surface has been created and configured somewhere let surface: ISCIChartSurface // Create DataSeries and fill it with some data let dataSeries = SCIXyDataSeries(xType: .double, yType: .double) // Create and add Mountain Series let columnSeries = SCIFastColumnRenderableSeries() columnSeries.dataSeries = dataSeries columnSeries.strokeStyle = SCISolidPenStyle(colorCode: 0xFFA99A8A, thickness: 1) columnSeries.fillBrushStyle = SCILinearGradientBrushStyle(start: CGPoint(x: 0, y: 0), end: CGPoint(x: 0, y: 1), startColorCode: 0xFF4682B4, endColorCode: 0xFFB0C4DE) surface.renderableSeries.add(columnSeries)
// Assume a surface has been created and configured somewhere IISCIChartSurface surface; // Create DataSeries and fill it with some data var dataSeries = new XyDataSeries<double, double>(); // Create and add Mountain Series var columnSeries = new SCIFastColumnRenderableSeries(); columnSeries.DataSeries = dataSeries; columnSeries.StrokeStyle = new SCISolidPenStyle(0xFFA99A8A, 1f); columnSeries.FillBrushStyle = new SCILinearGradientBrushStyle(new CGPoint(0, 0), new CGPoint(0, 1), 0xFF4682B4, 0xFFB0C4DE); surface.RenderableSeries.Add(columnSeries);

Column Series Features

Column Series also has some features similar to other series, such as:

Render a Gap in a Column Series

It’s possible to render a Gap in Column series, by passing a data point with a NaN as the Y value. Please refer to the RenderableSeries APIs article for more details.

Paint Column Area Parts With Different Colors

Paletted Column Series Type

In SciChart, you can draw each column of the Column Series with different colors using the PaletteProvider API. To use palette provider for Columns - a custom ISCIFillPaletteProvider (or ISCIStrokePaletteProvider) has to be provided to the ISCIRenderableSeries.paletteProvider property.

Please see the code snippet from our Column Chart Example below:

#import <SciChart/SCIPaletteProviderBase+Protected.h> @interface ColumnsTripleColorPalette : SCIPaletteProviderBase<SCIFastColumnRenderableSeries *><ISCIFillPaletteProvider> @end @implementation ColumnsTripleColorPalette { SCIUnsignedIntegerValues *_colors; } static unsigned int desiredColors[] = {0xFFa9d34f, 0xFFfc9930, 0xFFd63b3f}; - (instancetype)init { self = [super initWithRenderableSeriesType:SCIFastColumnRenderableSeries.class]; if (self) { _colors = [SCIUnsignedIntegerValues new]; } return self; } - (void)update { NSInteger count = self.renderableSeries.currentRenderPassData.pointsCount; _colors.count = count; unsigned int *colorsArray = _colors.itemsArray; for (NSInteger i = 0; i < count; i++) { colorsArray[i] = desiredColors[i % 3]; } } - (SCIUnsignedIntegerValues *)fillColors { return _colors; } @end ... columnSeries.paletteProvider = [ColumnsTripleColorPalette new];
import SciChart.Protected.SCIPaletteProviderBase class ColumnsTripleColorPalette : SCIPaletteProviderBase<SCIFastColumnRenderableSeries>, ISCIFillPaletteProvider { let colors = SCIUnsignedIntegerValues() let desiredColors:[UInt32] = [0xffa9d34f, 0xfffc9930, 0xffd63b3f] override init!(renderableSeriesType: AnyClass!) { super.init(renderableSeriesType: renderableSeriesType) } init() { super.init(renderableSeriesType: SCIFastColumnRenderableSeries.self) } override func update() { let count = renderableSeries.currentRenderPassData.pointsCount colors.count = count for i in 0 ..< count { colors.set(desiredColors[i % 3], at: i) } } var fillColors: SCIUnsignedIntegerValues! { return colors } } ... columnSeries.paletteProvider = ColumnsTripleColorPalette()
private class ColumnPaletteProvider : SCIPaletteProviderBase<SCIFastColumnRenderableSeries>, IISCIFillPaletteProvider { private readonly uint[] _desiredColors = { 0xFFa9d34f, 0xFFfc9930, 0xFFd63b3f }; public override void Update() { FillColors.Clear(); var pointsCount = RenderableSeries.CurrentRenderPassData.PointsCount; for (int i = 0; i < pointsCount; i++) { FillColors.Add(_desiredColors[i % 3]); } } public SCIUnsignedIntegerValues FillColors { get; } = new SCIUnsignedIntegerValues(); } ... columnSeries.PaletteProvider = new ColumnPaletteProvider();

For more information - please refer to the PaletteProvider API article.