BubbleChart.java :  » UnTagged » electricsleep » com » androsz » electricsleep » achartengine » chart » Android Open Source

/**
 * Copyright (C) 2009, 2010 SC 4ViewSoft SRL
 *  
 * 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.androsz.electricsleep.achartengine.chart;

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;

import com.androsz.electricsleep.achartengine.model.XYMultipleSeriesDataset;
import com.androsz.electricsleep.achartengine.model.XYValueSeries;
import com.androsz.electricsleep.achartengine.renderer.SimpleSeriesRenderer;
import com.androsz.electricsleep.achartengine.renderer.XYMultipleSeriesRenderer;
import com.androsz.electricsleep.achartengine.renderer.XYSeriesRenderer;

/**
 * The bubble chart rendering class.
 */
public class BubbleChart extends XYChart {
  /**
   * 
   */
  private static final long serialVersionUID = 9135746794048439840L;

  /** The legend shape width. */
  private static final int SHAPE_WIDTH = 10;

  /** The minimum bubble size. */
  private static final int MIN_BUBBLE_SIZE = 2;

  /** The maximum bubble size. */
  private static final int MAX_BUBBLE_SIZE = 20;

  /**
   * Builds a new bubble chart instance.
   * 
   * @param dataset
   *            the multiple series dataset
   * @param renderer
   *            the multiple series renderer
   */
  public BubbleChart(XYMultipleSeriesDataset dataset,
      XYMultipleSeriesRenderer renderer) {
    super(dataset, renderer);
  }

  /**
   * The graphical representation of a circle point shape.
   * 
   * @param canvas
   *            the canvas to paint to
   * @param paint
   *            the paint to be used for drawing
   * @param x
   *            the x value of the point the shape should be drawn at
   * @param y
   *            the y value of the point the shape should be drawn at
   * @param radius
   *            the bubble radius
   */
  private void drawCircle(Canvas canvas, Paint paint, float x, float y,
      float radius) {
    canvas.drawCircle(x, y, radius, paint);
  }

  /**
   * The graphical representation of the legend shape.
   * 
   * @param canvas
   *            the canvas to paint to
   * @param renderer
   *            the series renderer
   * @param x
   *            the x value of the point the shape should be drawn at
   * @param y
   *            the y value of the point the shape should be drawn at
   * @param paint
   *            the paint to be used for drawing
   */
  @Override
  public void drawLegendShape(Canvas canvas, SimpleSeriesRenderer renderer,
      float x, float y, Paint paint) {
    paint.setStyle(Style.FILL);
    drawCircle(canvas, paint, x + SHAPE_WIDTH, y, 3);
  }

  /**
   * The graphical representation of a series.
   * 
   * @param canvas
   *            the canvas to paint to
   * @param paint
   *            the paint to be used for drawing
   * @param points
   *            the array of points to be used for drawing the series
   * @param seriesRenderer
   *            the series renderer
   * @param yAxisValue
   *            the minimum value of the y axis
   * @param seriesIndex
   *            the index of the series currently being drawn
   */
  @Override
  public void drawSeries(Canvas canvas, Paint paint, float[] points,
      SimpleSeriesRenderer seriesRenderer, float yAxisValue,
      int seriesIndex) {
    final XYSeriesRenderer renderer = (XYSeriesRenderer) seriesRenderer;
    paint.setColor(renderer.getColor());
    paint.setStyle(Style.FILL);
    final int length = points.length;
    final XYValueSeries series = (XYValueSeries) mDataset
        .getSeriesAt(seriesIndex);
    final double max = series.getMaxValue();

    final double coef = MAX_BUBBLE_SIZE / max;
    for (int i = 0; i < length; i += 2) {
      final double size = series.getValue(i / 2) * coef + MIN_BUBBLE_SIZE;
      drawCircle(canvas, paint, points[i], points[i + 1], (float) size);
    }
  }

  /**
   * Returns the legend shape width.
   * 
   * @return the legend shape width
   */
  @Override
  public int getLegendShapeWidth() {
    return SHAPE_WIDTH;
  }

}