Android Open Source - customhellochartdemo Line Chart View

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Back to project page customhellochartdemo.

License

The source code is released under:

Apache License

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Java Source Code

package lecho.lib.hellocharts.view;
// www .j a va  2s  . c om
import lecho.lib.hellocharts.BuildConfig;
import lecho.lib.hellocharts.model.ChartData;
import lecho.lib.hellocharts.model.LineChartData;
import lecho.lib.hellocharts.model.PointValue;
import lecho.lib.hellocharts.model.SelectedValue;
import lecho.lib.hellocharts.provider.LineChartDataProvider;
import lecho.lib.hellocharts.renderer.LineChartRenderer;
import android.content.Context;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Log;

/**
 * LineChart, supports cubic lines, filled lines, circle and square points. Point radius and stroke width can be
 * adjusted usind LineChartData attributes.
 * 
 * @author Leszek Wach
 * 
 */
public class LineChartView extends AbstractChartView implements LineChartDataProvider {
  private static final String TAG = "LineChartView";
  protected LineChartData data;
  protected LineChartOnValueTouchListener onValueTouchListener = new DummyOnValueTouchListener();

  public LineChartView(Context context) {
    this(context, null, 0);
  }

  public LineChartView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public LineChartView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    chartRenderer = new LineChartRenderer(context, this, this);
    setLineChartData(LineChartData.generateDummyData());
  }

  @Override
  public void setLineChartData(LineChartData data) {
    if (BuildConfig.DEBUG) {
      Log.d(TAG, "Setting data for LineChartView");
    }

    if (null == data) {
      this.data = LineChartData.generateDummyData();
    } else {
      this.data = data;
    }

    axesRenderer.initAxesAttributes();
    chartRenderer.initDataAttributes();
    chartRenderer.initMaxViewport();
    chartRenderer.initCurrentViewport();

    ViewCompat.postInvalidateOnAnimation(LineChartView.this);
  }

  @Override
  public LineChartData getLineChartData() {
    return data;
  }

  @Override
  public ChartData getChartData() {
    return data;
  }

  @Override
  public void callTouchListener() {
    SelectedValue selectedValue = chartRenderer.getSelectedValue();

    if (selectedValue.isSet()) {
      PointValue point = data.getLines().get(selectedValue.getFirstIndex()).getValues()
          .get(selectedValue.getSecondIndex());
      onValueTouchListener.onValueTouched(selectedValue.getFirstIndex(), selectedValue.getSecondIndex(), point);
    } else {
      onValueTouchListener.onNothingTouched();
    }
  }

  public LineChartOnValueTouchListener getOnValueTouchListener() {
    return onValueTouchListener;
  }

  public void setOnValueTouchListener(LineChartOnValueTouchListener touchListener) {
    if (null == touchListener) {
      this.onValueTouchListener = new DummyOnValueTouchListener();
    } else {
      this.onValueTouchListener = touchListener;
    }
  }

  public interface LineChartOnValueTouchListener {
    public void onValueTouched(int selectedLine, int selectedValue, PointValue value);

    public void onNothingTouched();

  }

  private static class DummyOnValueTouchListener implements LineChartOnValueTouchListener {

    @Override
    public void onValueTouched(int selectedLine, int selectedValue, PointValue value) {
    }

    @Override
    public void onNothingTouched() {
    }

  }
}

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