PieChart.java

package ca.etsmtl.applets.etsmobile.views;

import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.model.CategorySeries;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.renderer.SimpleSeriesRenderer;

import android.content.Context;
import android.widget.LinearLayout;

/**
 * code pris de Archartengine
 * 
 * @author Laurence de Villers
 * 
 */
public class PieChart {

	private Context context;
	private GraphicalView mChartView;

	public PieChart(Context context, double[] values, int[] colors, LinearLayout layout) {
		this.context = context;

		DefaultRenderer renderer = buildCategoryRenderer(colors);
		renderer.setChartTitleTextSize(50);
		renderer.setDisplayValues(true);
		renderer.setShowLabels(false);
		renderer.setPanEnabled(false);
		renderer.setZoomEnabled(false);
		renderer.setShowLegend(false);

		if (mChartView == null) {
			layout.removeAllViews();
			mChartView = ChartFactory
					.getPieChartView(context, buildCategoryDataset("Project budget", values), renderer);
			layout.addView(mChartView);
		} else {
			mChartView.repaint();
		}

	}

	/**
	 * Builds a category series using the provided values.
	 * 
	 * @param titles
	 *            the series titles
	 * @param values
	 *            the values
	 * @return the category series
	 */
	protected CategorySeries buildCategoryDataset(String title, double[] values) {
		CategorySeries series = new CategorySeries(title);
		int k = 0;
		for (int i = 0; i < values.length; i++) {
			if (i < values.length - 1)
				series.add(" " + values[i] + "Go", values[i]);
			else
				series.add("Go Restant : " + values[i] + "Go", values[i]);
		}

		return series;
	}

	/**
	 * Builds a category renderer to use the provided colors.
	 * 
	 * @param colors
	 *            the colors
	 * @return the category renderer
	 */
	protected DefaultRenderer buildCategoryRenderer(int[] colors) {
		DefaultRenderer renderer = new DefaultRenderer();
		renderer.setLabelsTextSize(40);
		// renderer.setLegendTextSize(25);
		renderer.setMargins(new int[] { 10, 0, 0, 0 });
		// renderer.setLegendHeight(200);

		for (int color : colors) {
			SimpleSeriesRenderer r = new SimpleSeriesRenderer();
			r.setColor(color);
			renderer.addSeriesRenderer(r);
		}
		return renderer;
	}
}