This example demonstrates how to use LogarithmicNumericAxis with SciChart Android. This axis type can be used as XAxis or YAxis of the SciChartSurface in order to add a Logarithmic scale to an Android Chart. Axis labels are formatted using Scientific notation with Superscript.

Tips!

You can set LogarithmicBase when you need to change logarithmic base of the axis, e.g. Log10, LogE, Log2.

// Kotlin: LogarithmicAxisFragment.kt

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// LogarithmicAxisFragment.kt is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************

package com.scichart.examples.fragments.examples2d.modifyAxisBehavior.kt

import android.view.View
import android.view.animation.DecelerateInterpolator
import android.widget.AdapterView
import android.widget.CompoundButton
import android.widget.Spinner
import com.scichart.charting.visuals.SciChartSurface
import com.scichart.charting.visuals.axes.*
import com.scichart.charting.visuals.axes.ScientificNotation.LogarithmicBase
import com.scichart.charting.visuals.axes.ScientificNotation.Normalized
import com.scichart.data.model.DoubleRange
import com.scichart.drawing.utility.ColorUtil
import com.scichart.examples.R
import com.scichart.examples.components.SpinnerStringAdapter
import com.scichart.examples.data.DataManager
import com.scichart.examples.fragments.base.ExampleSingleChartBaseFragment
import com.scichart.examples.utils.ItemSelectedListenerBase
import com.scichart.examples.utils.ViewSettingsUtil
import com.scichart.examples.utils.scichartExtensions.*
import com.scichart.examples.utils.widgetgeneration.ImageViewWidget
import com.scichart.examples.utils.widgetgeneration.Widget
import java.util.*

class LogarithmicAxisFragment : ExampleSingleChartBaseFragment() {

    private var selectedLogBase = 10.0
    private var isXLogAxis = true
    private var isYLogAxis = true

    override fun initExample(surface: SciChartSurface) {
        val ds1Points = DataManager.getInstance().getExponentialCurve(1.8, 100)
        val ds2Points = DataManager.getInstance().getExponentialCurve(2.25, 100)
        val ds3Points = DataManager.getInstance().getExponentialCurve(3.59, 100)

        val line1Color = ColorUtil.argb(0xFF, 0xFF, 0xFF, 0x00)
        val line2Color = ColorUtil.argb(0xFF, 0x27, 0x9B, 0x27)
        val line3Color = ColorUtil.argb(0xFF, 0xFF, 0x19, 0x19)

        binding.surface.suspendUpdates {
            xAxes { generateAxis(isXLogAxis) }
            yAxes { generateAxis(isYLogAxis) }
            renderableSeries {
                fastLineRenderableSeries {
                    xyDataSeries<Double, Double>("Curve A") { append(ds1Points.xValues, ds1Points.yValues) }
                    strokeStyle = SolidPenStyle(line1Color)
                    ellipsePointMarker { setSize(5); fillStyle = SolidBrushStyle(line1Color) }

                    sweepAnimation { interpolator = DecelerateInterpolator() }
                }
                fastLineRenderableSeries {
                    xyDataSeries<Double, Double>("Curve B") { append(ds2Points.xValues, ds2Points.yValues) }
                    strokeStyle = SolidPenStyle(line2Color)
                    ellipsePointMarker { setSize(5); fillStyle = SolidBrushStyle(line2Color) }

                    sweepAnimation { interpolator = DecelerateInterpolator() }
                }
                fastLineRenderableSeries {
                    xyDataSeries<Double, Double>("Curve C") { append(ds3Points.xValues, ds3Points.yValues) }
                    strokeStyle = SolidPenStyle(line3Color)
                    ellipsePointMarker { setSize(5); fillStyle = SolidBrushStyle(line3Color) }

                    sweepAnimation { interpolator = DecelerateInterpolator() }
                }
            }

            chartModifiers { defaultModifiers() }
        }
    }

    private fun CollectionContext<IAxis>.generateAxis(isLogAxis: Boolean) {
        if (isLogAxis) logarithmicAxis {
            textFormatting = "#.#E+0"
            scientificNotation = LogarithmicBase
            logarithmicBase = selectedLogBase
            growBy = DoubleRange(0.1, 0.1)
            drawMajorBands = false
        }
        else numericAxis {
            textFormatting = "#.#E+0"
            scientificNotation = Normalized
            growBy = DoubleRange(0.1, 0.1)
            drawMajorBands = false
        }
    }

    override fun getToolbarItems(): List<Widget> = ArrayList<Widget>().apply {
        add(ImageViewWidget.Builder().setId(R.drawable.example_toolbar_settings).setListener { openSettingsDialog() }.build())
    }

    private fun openSettingsDialog() {
        val dialog = ViewSettingsUtil.createSettingsPopup(activity, R.layout.example_log_axis_popup_layout)
        val context = dialog.context

        dialog.findViewById<Spinner>(R.id.log_base_spinner).run {
            adapter = SpinnerStringAdapter(context, R.array.log_base_modes)
            setSelection(2)

            onItemSelectedListener = object : ItemSelectedListenerBase() {
                override fun onItemSelected(parent: AdapterView<*>?, view: View, position: Int, id: Long) {
                    when (position) {
                        0 -> selectedLogBase = 2.0
                        1 -> selectedLogBase = 5.0
                        2 -> selectedLogBase = 10.0
                        3 -> selectedLogBase = Math.E
                    }

                    trySetLogBaseForAxis(binding.surface.xAxes.first(), selectedLogBase)
                    trySetLogBaseForAxis(binding.surface.yAxes.first(), selectedLogBase)
                }
            }
        }

        ViewSettingsUtil.setUpSwitchCompat(dialog, R.id.use_log_on_x_axis_checkbox, isXLogAxis) { _: CompoundButton?, isChecked: Boolean ->
            isXLogAxis = isChecked
            binding.surface.suspendUpdates {
                xAxes(true) { generateAxis(isXLogAxis) }
            }
        }

        ViewSettingsUtil.setUpSwitchCompat(dialog, R.id.use_log_on_y_axis_checkbox, isYLogAxis) { _: CompoundButton?, isChecked: Boolean ->
            isYLogAxis = isChecked
            binding.surface.suspendUpdates {
                yAxes(true) { generateAxis(isYLogAxis) }
            }
        }

        dialog.show()
    }

    private fun trySetLogBaseForAxis(axis: IAxis, logBase: Double) {
        (axis as? ILogarithmicNumericAxis)?.logarithmicBase = logBase
    }
}

// Java: LogarithmicAxisFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// LogarithmicAxisFragment.java is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************

package com.scichart.examples.fragments.examples2d.modifyAxisBehavior;

import android.app.Dialog;
import android.content.Context;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
import android.widget.AdapterView;
import android.widget.Spinner;

import androidx.annotation.NonNull;

import com.scichart.charting.model.AxisCollection;
import com.scichart.charting.model.dataSeries.XyDataSeries;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.charting.visuals.axes.ILogarithmicNumericAxis;
import com.scichart.charting.visuals.axes.ScientificNotation;
import com.scichart.charting.visuals.pointmarkers.EllipsePointMarker;
import com.scichart.charting.visuals.pointmarkers.IPointMarker;
import com.scichart.charting.visuals.renderableSeries.FastLineRenderableSeries;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.drawing.utility.ColorUtil;
import com.scichart.examples.R;
import com.scichart.examples.components.SpinnerStringAdapter;
import com.scichart.examples.data.DataManager;
import com.scichart.examples.data.DoubleSeries;
import com.scichart.examples.fragments.base.ExampleSingleChartBaseFragment;
import com.scichart.examples.utils.ItemSelectedListenerBase;
import com.scichart.examples.utils.ViewSettingsUtil;
import com.scichart.examples.utils.widgetgeneration.ImageViewWidget;
import com.scichart.examples.utils.widgetgeneration.Widget;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class LogarithmicAxisFragment extends ExampleSingleChartBaseFragment {

    private double selectedLogBase = 10d;

    private boolean isXLogAxis = true;
    private boolean isYLogAxis = true;

    @NonNull
    @Override
    public List<Widget> getToolbarItems() {
        return new ArrayList<Widget>() {{
            add(new ImageViewWidget.Builder().setId(R.drawable.example_toolbar_settings).setListener(v -> openSettingsDialog()).build());
        }};
    }

    @Override
    protected void initExample(@NonNull SciChartSurface surface) {
        final DoubleSeries ds1Points = DataManager.getInstance().getExponentialCurve(1.8, 100);
        final DoubleSeries ds2Points = DataManager.getInstance().getExponentialCurve(2.25, 100);
        final DoubleSeries ds3Points = DataManager.getInstance().getExponentialCurve(3.59, 100);

        final XyDataSeries<Double, Double> dataSeries1 = sciChartBuilder.newXyDataSeries(Double.class, Double.class).withSeriesName("Curve A").build();
        final XyDataSeries<Double, Double> dataSeries2 = sciChartBuilder.newXyDataSeries(Double.class, Double.class).withSeriesName("Curve B").build();
        final XyDataSeries<Double, Double> dataSeries3 = sciChartBuilder.newXyDataSeries(Double.class, Double.class).withSeriesName("Curve C").build();

        dataSeries1.append(ds1Points.xValues, ds1Points.yValues);
        dataSeries2.append(ds2Points.xValues, ds2Points.yValues);
        dataSeries3.append(ds3Points.xValues, ds3Points.yValues);

        final int line1Color = ColorUtil.argb(0xFF, 0xFF, 0xFF, 0x00);
        final int line2Color = ColorUtil.argb(0xFF, 0x27, 0x9B, 0x27);
        final int line3Color = ColorUtil.argb(0xFF, 0xFF, 0x19, 0x19);

        final IPointMarker pointMarker1 = sciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(5).withFill(line1Color).build();
        final IPointMarker pointMarker2 = sciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(5).withFill(line2Color).build();
        final IPointMarker pointMarker3 = sciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(5).withFill(line3Color).build();

        final FastLineRenderableSeries line1 = sciChartBuilder.newLineSeries()
                .withStrokeStyle(line1Color)
                .withPointMarker(pointMarker1)
                .withDataSeries(dataSeries1)
                .build();
        final FastLineRenderableSeries line2 = sciChartBuilder.newLineSeries()
                .withStrokeStyle(line2Color)
                .withPointMarker(pointMarker2)
                .withDataSeries(dataSeries2)
                .build();
        final FastLineRenderableSeries line3 = sciChartBuilder.newLineSeries()
                .withStrokeStyle(line3Color)
                .withPointMarker(pointMarker3)
                .withDataSeries(dataSeries3)
                .build();

        UpdateSuspender.using(surface, () -> {
            Collections.addAll(surface.getXAxes(), generateLogarithmicAxis());
            Collections.addAll(surface.getYAxes(), generateLogarithmicAxis());
            Collections.addAll(surface.getRenderableSeries(), line1, line2, line3);
            Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newModifierGroupWithDefaultModifiers().build());

            sciChartBuilder.newAnimator(line1).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            sciChartBuilder.newAnimator(line2).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            sciChartBuilder.newAnimator(line3).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
        });

        surface.zoomExtents();
    }

    private IAxis generateLinearAxis() {
        return sciChartBuilder.newNumericAxis()
                .withTextFormatting("#.#E+0")
                .withScientificNotation(ScientificNotation.Normalized)
                .withGrowBy(0.1, 0.1)
                .withDrawMajorBands(false)
                .build();
    }

    private IAxis generateLogarithmicAxis() {
        return sciChartBuilder.newLogarithmicNumericAxis()
                .withTextFormatting("#.#E+0")
                .withScientificNotation(ScientificNotation.LogarithmicBase)
                .withLogarithmicBase(selectedLogBase)
                .withGrowBy(0.1, 0.1)
                .withDrawMajorBands(false)
                .build();
    }

    private void openSettingsDialog() {
        final Dialog dialog = ViewSettingsUtil.createSettingsPopup(getActivity(), R.layout.example_log_axis_popup_layout);
        Context context = dialog.getContext();

        final SpinnerStringAdapter logBaseModesAdapter = new SpinnerStringAdapter(context, R.array.log_base_modes);
        final Spinner logBaseModesSpinner = dialog.findViewById(R.id.log_base_spinner);
        logBaseModesSpinner.setAdapter(logBaseModesAdapter);
        logBaseModesSpinner.setSelection(2);
        logBaseModesSpinner.setOnItemSelectedListener(new ItemSelectedListenerBase() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                switch (position){
                    case 0: selectedLogBase = 2d; break;
                    case 1: selectedLogBase = 5d; break;
                    case 2: selectedLogBase = 10d; break;
                    case 3: selectedLogBase = Math.E; break;
                }

                trySetLogBaseForAxis(binding.surface.getXAxes().get(0), selectedLogBase);
                trySetLogBaseForAxis(binding.surface.getYAxes().get(0), selectedLogBase);
            }
        });

        ViewSettingsUtil.setUpSwitchCompat(dialog, R.id.use_log_on_x_axis_checkbox, isXLogAxis, (buttonView, isChecked) -> {
            isXLogAxis = isChecked;

            final SciChartSurface surface = binding.surface;
            UpdateSuspender.using(surface, () -> {
                final AxisCollection xAxes = surface.getXAxes();
                xAxes.clear();
                xAxes.add(isXLogAxis ? generateLogarithmicAxis() : generateLinearAxis());
            });
        });

        ViewSettingsUtil.setUpSwitchCompat(dialog, R.id.use_log_on_y_axis_checkbox, isYLogAxis, (buttonView, isChecked) -> {
            isYLogAxis = isChecked;

            final SciChartSurface surface = binding.surface;
            UpdateSuspender.using(surface, () -> {
                final AxisCollection yAxes = surface.getYAxes();
                yAxes.clear();
                yAxes.add(isYLogAxis ? generateLogarithmicAxis() : generateLinearAxis());
            });
        });

        dialog.show();
    }

    private static void trySetLogBaseForAxis(IAxis axis, double logBase) {
        if (axis instanceof ILogarithmicNumericAxis) {
            ((ILogarithmicNumericAxis) axis).setLogarithmicBase(logBase);
        }
    }
}

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