This example showcases the rich SciChart iOS 3D Charts API that provides many different Axis types out of the box. One of the axis types is Logarithmic Axis, that is widely used in charts in wide range of iOS applications.

The LogarithmicNumericAxis3D is a Logarithmic Value-Axis and is suitable when the data on that axis is a Numeric value e.g. Double, Int, Long, Float.

You can read more about how to set different axis types in SciChart iOS 3D and other axis types in our documentation:

Axis types in SciChart iOS 3D Charts Library.

// LogarithmicAxis3DChartView.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// LogarithmicAxis3DChartView.m is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

#import "LogarithmicAxis3DChartView.h"
#import "SCDDataManager.h"

@implementation LogarithmicAxis3DChartView

- (Class)associatedType { return SCIChartSurface3D.class; }

- (void)initExample {
    SCILogarithmicNumericAxis3D *xAxis = [SCILogarithmicNumericAxis3D new];
    xAxis.growBy = [[SCIDoubleRange alloc] initWithMin:0.1 max:0.1];
    xAxis.drawMajorBands = NO;
    xAxis.textFormatting = @"#.#e+0";
    xAxis.scientificNotation = SCIScientificNotation_LogarithmicBase;
    
    SCILogarithmicNumericAxis3D *yAxis = [SCILogarithmicNumericAxis3D new];
    yAxis.growBy = [[SCIDoubleRange alloc] initWithMin:0.1 max:0.1];
    yAxis.drawMajorBands = NO;
    yAxis.textFormatting = @"#.0";
    yAxis.scientificNotation = SCIScientificNotation_None;
    
    SCINumericAxis3D *zAxis = [SCINumericAxis3D new];
    zAxis.growBy = [[SCIDoubleRange alloc] initWithMin:0.5 max:0.5];
    
    const int count = 100;
    SCDDoubleSeries* data1 = [SCDDataManager getExponentialCurveWithExponent:1.8 count:count];
    
    SCIXyzDataSeries3D *ds1 = [[SCIXyzDataSeries3D alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double zType:SCIDataType_Double];
    SCIPointMetadataProvider3D *metadataProvider = [SCIPointMetadataProvider3D new];
  
    for (int i = 0; i < count; ++i) {
        double x = [data1.xValues getValueAt:i];
        double y = [data1.yValues getValueAt:i];
        double z = [SCDDataManager getGaussianRandomNumber:15 stdDev:1.5];
        [ds1 appendX:@(x) y:@(y) z:@(z)];
        
        SCIPointMetadata3D *metaData = [[SCIPointMetadata3D alloc] initWithVertexColor:[SCDDataManager randomColor] andScale:[SCDDataManager randomScale]];
        [metadataProvider.metadata addObject:metaData];
    }
    
    SCISpherePointMarker3D *pointMarker = [SCISpherePointMarker3D new];
    pointMarker.size = 5.f;
    
    SCIPointLineRenderableSeries3D *rSeries = [SCIPointLineRenderableSeries3D new];
    rSeries.dataSeries = ds1;
    rSeries.strokeThickness = 2.0;
    rSeries.pointMarker = pointMarker;
    rSeries.metadataProvider = metadataProvider;
    
    [SCIUpdateSuspender usingWithSuspendable:self.surface withBlock:^{
        self.surface.xAxis = xAxis;
        self.surface.yAxis = yAxis;
        self.surface.zAxis = zAxis;
        [self.surface.renderableSeries add:rSeries];
        [self.surface.chartModifiers add:[SCDExampleBaseViewController createDefaultModifiers3D]];
    }];
}

@end

// LogarithmicAxis3DChartView.swift

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// LogarithmicAxis3DChartView.swift is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

class LogarithmicAxis3DChartView: SCDSingleChartViewController<SCIChartSurface3D> {
    
    override var associatedType: AnyClass { return SCIChartSurface3D.self }
    
    override func initExample() {
        
        let xAxis = SCILogarithmicNumericAxis3D()
        xAxis.growBy = SCIDoubleRange(min: 0.1, max: 0.1)
        xAxis.drawMajorBands = false
        xAxis.textFormatting = "#.#e+0"
        xAxis.scientificNotation = .logarithmicBase
        
        let yAxis = SCILogarithmicNumericAxis3D()
        yAxis.growBy = SCIDoubleRange(min: 0.1, max: 0.1)
        yAxis.drawMajorBands = false
        yAxis.textFormatting = "#.0"
        yAxis.scientificNotation = .none
        
        let zAxis = SCINumericAxis3D()
        zAxis.growBy = SCIDoubleRange(min: 0.5, max: 0.5)
        
        let count = 100
        let data = SCDDataManager.getExponentialCurve(withExponent: 1.8, count: 100)
        
        let dataSeries = SCIXyzDataSeries3D(xType: .double, yType: .double, zType: .double)
        let pointMetaDataProvider = SCIPointMetadataProvider3D()
        
        for i in 0 ..< count {
            let x = data.xValues.getValueAt(i)
            let y = data.yValues.getValueAt(i)
            let z = SCDDataManager.getGaussianRandomNumber(15, stdDev: 1.5)
            dataSeries.append(x: x, y: y, z: z)
            
            let metadata = SCIPointMetadata3D(vertexColor: SCDDataManager.randomColor(), andScale: SCDDataManager.randomScale())
            pointMetaDataProvider.metadata.add(metadata)
        }
        
        let pointMarker = SCISpherePointMarker3D()
        pointMarker.size = 5.0
        
        let rSeries = SCIPointLineRenderableSeries3D()
        rSeries.dataSeries = dataSeries
        rSeries.strokeThickness = 2.0
        rSeries.pointMarker = pointMarker
        rSeries.metadataProvider = pointMetaDataProvider
        
        SCIUpdateSuspender.usingWith(surface) {
            self.surface.xAxis = xAxis
            self.surface.yAxis = yAxis
            self.surface.zAxis = zAxis
            self.surface.renderableSeries.add(rSeries)
            self.surface.chartModifiers.add(SCDExampleBaseViewController.createDefaultModifiers3D())
        }
    }
}

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