Android Open Source - customhellochartdemo Preview Column Chart Activity

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License

The source code is released under:

Apache License

Java Source Code

package lecho.lib.hellocharts.samples;
//from   w w  w.  j av a 2s. c  om
import java.util.ArrayList;
import java.util.List;

import lecho.lib.hellocharts.ViewportChangeListener;
import lecho.lib.hellocharts.gesture.ZoomType;
import lecho.lib.hellocharts.model.Axis;
import lecho.lib.hellocharts.model.Column;
import lecho.lib.hellocharts.model.ColumnChartData;
import lecho.lib.hellocharts.model.ColumnValue;
import lecho.lib.hellocharts.model.Viewport;
import lecho.lib.hellocharts.util.Utils;
import lecho.lib.hellocharts.view.ColumnChartView;
import lecho.lib.hellocharts.view.PreviewColumnChartView;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

public class PreviewColumnChartActivity extends ActionBarActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_preview_column_chart);
    if (savedInstanceState == null) {
      getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
    }
  }

  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {

    private ColumnChartView chart;
    private PreviewColumnChartView previewChart;
    private ColumnChartData data;
    /**
     * Deep copy of data.
     */
    private ColumnChartData previewData;

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      setHasOptionsMenu(true);
      View rootView = inflater.inflate(R.layout.fragment_preview_column_chart, container, false);

      chart = (ColumnChartView) rootView.findViewById(R.id.chart);
      previewChart = (PreviewColumnChartView) rootView.findViewById(R.id.chart_preview);

      // Generate data for previewed chart and copy of that data for preview chart.
      generateDefaultData();

      chart.setColumnChartData(data);
      // Disable zoom/scroll for previewed chart, visible chart ranges depends on preview chart viewport so
      // zoom/scroll is unnecessary.
      chart.setZoomEnabled(false);
      chart.setScrollEnabled(false);

      previewChart.setColumnChartData(previewData);
      previewChart.setViewportChangeListener(new ViewportListener());

      previewX(false);

      return rootView;
    }

    // MENU
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
      inflater.inflate(R.menu.preview_column_chart, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
      int id = item.getItemId();
      if (id == R.id.action_reset) {
        generateDefaultData();
        chart.setColumnChartData(data);
        previewChart.setColumnChartData(previewData);
        previewX(true);
        return true;
      }
      if (id == R.id.action_preview_both) {
        previewXY();
        previewChart.setZoomType(ZoomType.HORIZONTAL_AND_VERTICAL);
        return true;
      }
      if (id == R.id.action_preview_horizontal) {
        previewX(true);
        return true;
      }
      if (id == R.id.action_preview_vertical) {
        previewY();
        return true;
      }
      if (id == R.id.action_change_color) {
        int color = Utils.pickColor();
        while (color == previewChart.getPreviewColor()) {
          color = Utils.pickColor();
        }
        previewChart.setPreviewColor(color);
        return true;
      }
      return super.onOptionsItemSelected(item);
    }

    private void generateDefaultData() {
      int numSubcolumns = 1;
      int numColumns = 50;
      List<Column> columns = new ArrayList<Column>();
      List<ColumnValue> values;
      for (int i = 0; i < numColumns; ++i) {

        values = new ArrayList<ColumnValue>();
        for (int j = 0; j < numSubcolumns; ++j) {
          values.add(new ColumnValue((float) Math.random() * 50f + 5, Utils.pickColor()));
        }

        columns.add(new Column(values));
      }

      data = new ColumnChartData(columns);
      data.setAxisXBottom(new Axis());
      data.setAxisYLeft(new Axis().setHasLines(true));

      // prepare preview data, is better to use separate deep copy for preview chart.
      // set color to grey to make preview area more visible.
      previewData = new ColumnChartData(data);
      for (Column column : previewData.getColumns()) {
        for (ColumnValue value : column.getValues()) {
          value.setColor(Utils.DEFAULT_DARKEN_COLOR);
        }
      }

    }

    private void previewY() {
      Viewport tempViewport = new Viewport(chart.getMaximumViewport());
      float dy = tempViewport.height() / 4;
      tempViewport.inset(0, dy);
      previewChart.setCurrentViewport(tempViewport, true);
      previewChart.setZoomType(ZoomType.VERTICAL);
    }

    private void previewX(boolean animate) {
      Viewport tempViewport = new Viewport(chart.getMaximumViewport());
      float dx = tempViewport.width() / 4;
      tempViewport.inset(dx, 0);
      previewChart.setCurrentViewport(tempViewport, animate);
      previewChart.setZoomType(ZoomType.HORIZONTAL);
    }

    private void previewXY() {
      // Better to not modify viewport of any chart directly so create a copy.
      Viewport tempViewport = new Viewport(chart.getMaximumViewport());
      // Make temp viewport smaller.
      float dx = tempViewport.width() / 4;
      float dy = tempViewport.height() / 4;
      tempViewport.inset(dx, dy);
      previewChart.setCurrentViewport(tempViewport, true);
    }

    /**
     * Viewport listener for preview chart(lower one). in {@link #onViewportChanged(Viewport)} method change
     * viewport of upper chart.
     */
    private class ViewportListener implements ViewportChangeListener {

      @Override
      public void onViewportChanged(Viewport newViewport) {
        // don't use animation, it is unnecessary when using preview chart because usually viewport changes
        // happens to often.
        chart.setCurrentViewport(newViewport, false);
      }

    }
  }
}

Java Source Code List

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