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/**
* Copyright (C) 2009 - 2013 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.codename1.charts.views;
import java.util.ArrayList;
import java.util.List;
import com.codename1.charts.compat.Canvas;
import com.codename1.charts.compat.GradientDrawable;
import com.codename1.charts.compat.GradientDrawable.Orientation;
import com.codename1.charts.compat.Paint;
import com.codename1.charts.compat.Paint.Style;
import com.codename1.charts.models.CategorySeries;
import com.codename1.charts.models.Point;
import com.codename1.charts.models.SeriesSelection;
import com.codename1.charts.renderers.DefaultRenderer;
import com.codename1.charts.renderers.SimpleSeriesRenderer;
import com.codename1.ui.geom.Rectangle2D;
import com.codename1.ui.geom.Shape;
/**
* 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 (autoCalculateCenter || mCenterX == NO_VALUE) {
mCenterX = (left + right) / 2;
}
if (autoCalculateCenter || 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;
Rectangle2D oval = PkgUtils.makeRect(mCenterX - radius, mCenterY - radius, mCenterX + radius, mCenterY
+ radius);
List prevLabelsBounds = new ArrayList();
for (int i = 0; i < sLength; i++) {
SimpleSeriesRenderer seriesRenderer = mRenderer.getSeriesRendererAt(i);
boolean gradient = false;
GradientDrawable gradientDrawable = null;
if (seriesRenderer.isGradientEnabled()) {
gradient = true;
gradientDrawable = new GradientDrawable(Orientation.TOP_BOTTOM, new int[]{ seriesRenderer.getGradientStartColor(), seriesRenderer.getGradientStopColor()});
paint.setColor(seriesRenderer.getGradientStartColor());
} else {
paint.setColor(seriesRenderer.getColor());
}
float value = (float) mDataset.getValue(i);
float angle = (float) (value / total * 360);
if (seriesRenderer.isHighlighted()) {
double rAngle = Math.toRadians(90 - (currentAngle + angle / 2));
float translateX = (float) (radius * 0.1 * Math.sin(rAngle));
float translateY = (float) (radius * 0.1 * Math.cos(rAngle));
oval.translate(translateX, translateY);
if (gradient) {
canvas.drawArcWithGradient(oval, currentAngle, angle, true, paint, gradientDrawable);
} else {
canvas.drawArc(oval, currentAngle, angle, true, paint);
}
oval.translate(-translateX, -translateY);
} else {
if (gradient) {
canvas.drawArcWithGradient(oval, currentAngle, angle, true, paint, gradientDrawable);
} else {
canvas.drawArc(oval, currentAngle, angle, true, paint);
}
}
paint.setColor(seriesRenderer.getColor());
//paint.setShader(null);
drawLabel(canvas, mDataset.getCategory(i), mRenderer, prevLabelsBounds, mCenterX, mCenterY,
shortRadius, longRadius, currentAngle, angle, left, right, mRenderer.getLabelsColor(),
paint, true, false);
if (mRenderer.isDisplayValues()) {
drawLabel(
canvas,
getLabel(mRenderer.getSeriesRendererAt(i).getChartValuesFormat(), mDataset.getValue(i)),
mRenderer, prevLabelsBounds, mCenterX, mCenterY, shortRadius / 2, longRadius / 2,
currentAngle, angle, left, right, mRenderer.getLabelsColor(), paint, false, true);
}
// 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);
}
/**
* Gets the shape of a pie segment given its point index.
* @param pointIndex The point index representing the pie segment.
* @return A shape of the outline of the segment.
*/
public Shape getSegmentShape(int pointIndex){
return mPieMapper.getSegmentShape(pointIndex);
}
}
