SimpleXYPlotActivity.java

/*
 * Copyright 2015 AndroidPlot.com
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.androidplot.demos;
import android.app.Activity;
import android.graphics.DashPathEffect;
import android.os.Bundle;
import com.androidplot.util.PixelUtils;
import com.androidplot.xy.SimpleXYSeries;
import com.androidplot.xy.XYSeries;
import com.androidplot.xy.*;

import java.text.FieldPosition;
import java.text.Format;
import java.text.ParsePosition;
import java.util.*;

/**
 * A simple XYPlot
 */
public class SimpleXYPlotActivity extends Activity {

    private XYPlot plot;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.simple_xy_plot_example);

        // initialize our XYPlot reference:
        plot = (XYPlot) findViewById(R.id.plot);

        // create a couple arrays of y-values to plot:
        final Number[] domainLabels = {1, 2, 3, 6, 7, 8, 9, 10, 13, 14};
        Number[] series1Numbers = {1, 4, 2, 8, 4, 16, 8, 32, 16, 64};
        Number[] series2Numbers = {5, 2, 10, 5, 20, 10, 40, 20, 80, 40};

        // turn the above arrays into XYSeries':
        // (Y_VALS_ONLY means use the element index as the x value)
        XYSeries series1 = new SimpleXYSeries(
                Arrays.asList(series1Numbers), SimpleXYSeries.ArrayFormat.Y_VALS_ONLY, "Series1");
        XYSeries series2 = new SimpleXYSeries(
                Arrays.asList(series2Numbers), SimpleXYSeries.ArrayFormat.Y_VALS_ONLY, "Series2");

        // create formatters to use for drawing a series using LineAndPointRenderer
        // and configure them from xml:
        LineAndPointFormatter series1Format = new LineAndPointFormatter();
        series1Format.setPointLabelFormatter(new PointLabelFormatter());
        series1Format.configure(getApplicationContext(),
                R.xml.line_point_formatter_with_labels);

        LineAndPointFormatter series2Format = new LineAndPointFormatter();
        series2Format.setPointLabelFormatter(new PointLabelFormatter());
        series2Format.configure(getApplicationContext(),
                R.xml.line_point_formatter_with_labels_2);

        // add an "dash" effect to the series2 line:
        series2Format.getLinePaint().setPathEffect(
                new DashPathEffect(new float[] {

                        // always use DP when specifying pixel sizes, to keep things consistent across devices:
                        PixelUtils.dpToPix(20),
                        PixelUtils.dpToPix(15)}, 0));

        // just for fun, add some smoothing to the lines:
        // see: http://androidplot.com/smooth-curves-and-androidplot/
        series1Format.setInterpolationParams(
                new CatmullRomInterpolator.Params(10, CatmullRomInterpolator.Type.Centripetal));

        series2Format.setInterpolationParams(
                new CatmullRomInterpolator.Params(10, CatmullRomInterpolator.Type.Centripetal));

        // add a new series' to the xyplot:
        plot.addSeries(series1, series1Format);
        plot.addSeries(series2, series2Format);

        plot.getGraph().getLineLabelStyle(XYGraphWidget.Edge.BOTTOM).setFormat(new Format() {
            @Override
            public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
                int i = Math.round(((Number) obj).floatValue());
                return toAppendTo.append(domainLabels[i]);
            }
            @Override
            public Object parseObject(String source, ParsePosition pos) {
                return null;
            }
        });
    }
}