/**
* Copyright (C) 2009 - 2012 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 org.achartengine.chart;
import java.util.ArrayList;
import java.util.List;
import org.achartengine.model.CategorySeries;
import org.achartengine.model.Point;
import org.achartengine.model.SeriesSelection;
import org.achartengine.renderer.DefaultRenderer;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RectF;
/**
* The pie chart rendering class.
*/
public class PieChart extends RoundChart {
/** Handles returning values when tapping on PieChart. */
private PieMapper mPieMapper;
/**
* Builds a new pie chart instance.
*
* @param dataset the series dataset
* @param renderer the series renderer
*/
public PieChart(CategorySeries dataset, DefaultRenderer renderer) {
super(dataset, renderer);
mPieMapper = new PieMapper();
}
/**
* The graphical representation of the pie chart.
*
* @param canvas the canvas to paint to
* @param x the top left x value of the view to draw to
* @param y the top left y value of the view to draw to
* @param width the width of the view to draw to
* @param height the height of the view to draw to
* @param paint the paint
*/
@Override
public void draw(Canvas canvas, int x, int y, int width, int height, Paint paint) {
paint.setAntiAlias(mRenderer.isAntialiasing());
paint.setStyle(Style.FILL);
paint.setTextSize(mRenderer.getLabelsTextSize());
int legendSize = getLegendSize(mRenderer, height / 5, 0);
int left = x;
int top = y;
int right = x + width;
int sLength = mDataset.getItemCount();
double total = 0;
String[] titles = new String[sLength];
for (int i = 0; i < sLength; i++) {
total += mDataset.getValue(i);
titles[i] = mDataset.getCategory(i);
}
if (mRenderer.isFitLegend()) {
legendSize = drawLegend(canvas, mRenderer, titles, left, right, y, width, height, legendSize,
paint, true);
}
int bottom = y + height - legendSize;
drawBackground(mRenderer, canvas, x, y, width, height, paint, false, DefaultRenderer.NO_COLOR);
float currentAngle = mRenderer.getStartAngle();
int mRadius = Math.min(Math.abs(right - left), Math.abs(bottom - top));
int radius = (int) (mRadius * 0.35 * mRenderer.getScale());
if (mCenterX == NO_VALUE) {
mCenterX = (left + right) / 2;
}
if (mCenterY == NO_VALUE) {
mCenterY = (bottom + top) / 2;
}
// Hook in clip detection after center has been calculated
mPieMapper.setDimensions(radius, mCenterX, mCenterY);
boolean loadPieCfg = !mPieMapper.areAllSegmentPresent(sLength);
if (loadPieCfg) {
mPieMapper.clearPieSegments();
}
float shortRadius = radius * 0.9f;
float longRadius = radius * 1.1f;
RectF oval = new RectF(mCenterX - radius, mCenterY - radius, mCenterX + radius, mCenterY
+ radius);
List<RectF> prevLabelsBounds = new ArrayList<RectF>();
for (int i = 0; i < sLength; i++) {
paint.setColor(mRenderer.getSeriesRendererAt(i).getColor());
float value = (float) mDataset.getValue(i);
float angle = (float) (value / total * 360);
canvas.drawArc(oval, currentAngle, angle, true, paint);
drawLabel(canvas, mDataset.getCategory(i), mRenderer, prevLabelsBounds, mCenterX, mCenterY,
shortRadius, longRadius, currentAngle, angle, left, right, mRenderer.getLabelsColor(),
paint, true);
if (mRenderer.isDisplayValues()) {
drawLabel(canvas, getLabel(mDataset.getValue(i)), mRenderer, prevLabelsBounds, mCenterX,
mCenterY, shortRadius / 2, longRadius / 2, currentAngle, angle, left, right,
mRenderer.getLabelsColor(), paint, false);
}
// Save details for getSeries functionality
if (loadPieCfg) {
mPieMapper.addPieSegment(i, value, currentAngle, angle);
}
currentAngle += angle;
}
prevLabelsBounds.clear();
drawLegend(canvas, mRenderer, titles, left, right, y, width, height, legendSize, paint, false);
drawTitle(canvas, x, y, width, paint);
}
public SeriesSelection getSeriesAndPointForScreenCoordinate(Point screenPoint) {
return mPieMapper.getSeriesAndPointForScreenCoordinate(screenPoint);
}
}