Column Charts are very often used in Sales dashboards, as well as Fitness applications. This example will show how to generate a simple Column chart in code.

The FastColumnRenderableSeries can be used to render an XyDataSeries (which contains one X-point and one Y-point); XyyDataSeries (renders Y values), XyzDataSeries; HlDataSeries and OhlcDataSeries(renders Close values).

Columns are drawn using the pens provided by the setStrokeStyle(PenStyle) (outline) and using the Brush provided by the setFillBrushStyle(BrushStyle) (fill).

Tip!

Do you need to change the width of a column? Try calling the setDataPointWidth() method passing in any number from 0.0 to 1.0. This alters how much space a column takes up.

// ColumnChartFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2017. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// ColumnChartFragment.java 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.
//******************************************************************************

package com.scichart.examples.fragments;

import android.view.animation.DecelerateInterpolator;

import com.scichart.charting.model.dataSeries.IXyDataSeries;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.charting.visuals.renderableSeries.FastColumnRenderableSeries;
import com.scichart.charting.visuals.renderableSeries.data.XSeriesRenderPassData;
import com.scichart.charting.visuals.renderableSeries.paletteProviders.IFillPaletteProvider;
import com.scichart.charting.visuals.renderableSeries.paletteProviders.PaletteProviderBase;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.core.model.IntegerValues;
import com.scichart.drawing.utility.ColorUtil;
import com.scichart.examples.R;
import com.scichart.examples.fragments.base.ExampleBaseFragment;

import java.util.Collections;

import butterknife.BindView;

public class ColumnChartFragment extends ExampleBaseFragment {

    @BindView(R.id.chart)
    SciChartSurface surface;

    @Override
    protected int getLayoutId() {
        return R.layout.example_single_chart_fragment;
    }

    @Override
    protected void initExample() {
        final IAxis xAxis = sciChartBuilder.newNumericAxis().withGrowBy(0.1, 0.1).build();
        final IAxis yAxis = sciChartBuilder.newNumericAxis().withGrowBy(0, 0.1).build();

        IXyDataSeries<Integer, Integer> dataSeries = sciChartBuilder.newXyDataSeries(Integer.class, Integer.class).build();
        final int[] yValues = {50, 35, 61, 58, 50, 50, 40, 53, 55, 23, 45, 12, 59, 60};

        for (int i = 0; i < yValues.length; i++) {
            dataSeries.append(i, yValues[i]);
        }

        final FastColumnRenderableSeries rSeries = sciChartBuilder.newColumnSeries()
                .withStrokeStyle(0xFF232323, 0.4f)
                .withDataPointWidth(0.7)
                .withLinearGradientColors(ColorUtil.LightSteelBlue, ColorUtil.SteelBlue)
                .withDataSeries(dataSeries)
                .withPaletteProvider(new ColumnsPaletteProvider())
                .build();

        UpdateSuspender.using(surface, new Runnable() {
            @Override
            public void run() {
                Collections.addAll(surface.getXAxes(), xAxis);
                Collections.addAll(surface.getYAxes(), yAxis);
                Collections.addAll(surface.getRenderableSeries(), rSeries);
                Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newModifierGroupWithDefaultModifiers().build());

                sciChartBuilder.newAnimator(rSeries).withWaveTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            }
        });
    }

    private class ColumnsPaletteProvider extends PaletteProviderBase<FastColumnRenderableSeries> implements IFillPaletteProvider {
        /*
            Gradients as in iOS, we don't support gradient palette provider yet
            #1 start: 0xFFa9d34f; finish: 0xFF93b944; PEN 0xFF232323
            #2 start: 0xFFfc9930; finish: 0xFFd17f28; PEN 0xFF232323
            #3 start: 0xFFd63b3f; finish: 0xFFbc3337; PEN 0xFF232323
         */
        private final IntegerValues colors = new IntegerValues();
        private final int[] desiredColors = new int[]{0xFFa9d34f, 0xFFfc9930, 0xFFd63b3f};

        protected ColumnsPaletteProvider() {
            super(FastColumnRenderableSeries.class);
        }

        @Override
        public void update() {
            final XSeriesRenderPassData currentRenderPassData = (XSeriesRenderPassData) renderableSeries.getCurrentRenderPassData();

            final int size = currentRenderPassData.pointsCount();
            colors.setSize(size);

            final int[] colorsArray = colors.getItemsArray();
            final int[] indices = currentRenderPassData.indices.getItemsArray();
            for (int i = 0; i < size; i++) {
                final int index = indices[i];
                colorsArray[i] = desiredColors[index % 3];
            }
        }

        @Override
        public IntegerValues getFillColors() {
            return colors;
        }
    }
}

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