package test;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.geom.Arc2D;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* 繪制帶陰影的餅圖
*
* @author Biao
*/
@SuppressWarnings("serial")
public class Pie3D extends JPanel {
// 餅圖中每一個部分的百分比
private double[] percents = { 10.72, 15.38, 3.74, 10.26, 6.56, 5.69, 10.72, 15.38, 6.15, 18.0 };
// 餅圖的顏色
private Color[] pieColors;
public Pie3D() {
List<Color> colors = new ArrayList<Color>();
colors.add(getColorFromHex("#169800"));
colors.add(getColorFromHex("#00E500"));
colors.add(getColorFromHex("#D0F15A"));
colors.add(getColorFromHex("#FF7321"));
colors.add(getColorFromHex("#E2FF55"));
colors.add(getColorFromHex("#AA6A2D"));
colors.add(getColorFromHex("#BFDD89"));
colors.add(getColorFromHex("#D718A5"));
colors.add(getColorFromHex("#00DBFF"));
colors.add(getColorFromHex("#00FF00"));
pieColors = colors.toArray(new Color[0]);
}
public static Color getColorFromHex(String hex) {
try {
return new Color(Integer.valueOf(hex.substring(1), 16));
} catch (Exception e) {
return Color.BLACK;
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int w = 380;
int h = (int) (w * 0.618);
fillPies(g2d, percents, 30, 30, w, h);
}
private void fillPies(Graphics2D g2d, double[] percents, int x, int y, int w, int h) {
int colorIndex = 0;
double startAngle = 0;
double arcAngle = 0;
// 一次性繪制完陰影，然后再繪制餅圖的效果比繪制餅圖的同時繪制它的陰影好
for (int i = 0; i < percents.length; ++i) {
arcAngle = percents[i] * 3.6;
if (i + 1 == percents.length) {
arcAngle = 360 - startAngle;
}
Arc2D.Double arcTop = new Arc2D.Double(x, y, w, h, startAngle, arcAngle, Arc2D.PIE);
g2d.setColor(pieColors[colorIndex].darker());
g2d.fill(buildShadow(arcTop));
// g2d.setColor(pieColors[colorIndex]);
// g2d.fill(arcTop);
colorIndex = (colorIndex + 1) % pieColors.length;
startAngle += arcAngle;
}
colorIndex = 0;
startAngle = 0;
for (int i = 0; i < percents.length; ++i) {
arcAngle = percents[i] * 3.6;
if (i + 1 == percents.length) {
arcAngle = 360 - startAngle;
}
Arc2D.Double arcTop = new Arc2D.Double(x, y, w, h, startAngle, arcAngle, Arc2D.PIE);
g2d.setColor(pieColors[colorIndex]);
g2d.fill(arcTop);
colorIndex = (colorIndex + 1) % pieColors.length;
startAngle += arcAngle;
}
}
private Area buildShadow(Arc2D arc) {
int shadowDapth = 10;
Arc2D arcBottom = new Arc2D.Double(arc.getX(), arc.getY() + shadowDapth, arc.getWidth(),
arc.getHeight() + 0, arc.getAngleStart(), arc.getAngleExtent(), Arc2D.CHORD);
Point2D topLeft = new Point2D.Double(arc.getStartPoint().getX(), arc.getStartPoint().getY());
Point2D topRight = new Point2D.Double(arc.getEndPoint().getX(), arc.getEndPoint().getY());
Point2D bottomLeft = new Point2D.Double(arcBottom.getStartPoint().getX(), arcBottom
.getStartPoint().getY());
Point2D bottomRight = new Point2D.Double(arcBottom.getEndPoint().getX(), arcBottom
.getEndPoint().getY());
double[] xpoints = { topLeft.getX(), topRight.getX(), bottomRight.getX(), bottomLeft.getX() };
double[] ypoints = { topLeft.getY(), topRight.getY(), bottomRight.getY(), bottomLeft.getY() };
GeneralPath path = new GeneralPath();
path.moveTo(xpoints[0], ypoints[0]);
path.lineTo(xpoints[1], ypoints[1]);
path.lineTo(xpoints[2], ypoints[2]);
path.lineTo(xpoints[3], ypoints[3]);
path.closePath();
Area area = new Area(arcBottom);
area.add(new Area(path));
return area;
}
private static void createGuiAndShow() {
JFrame frame = new JFrame("Pie with Shadow");
frame.getContentPane().add(new Pie3D());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int sw = Toolkit.getDefaultToolkit().getScreenSize().width;
int sh = Toolkit.getDefaultToolkit().getScreenSize().height;
int w = 500;
int h = 400;
int x = (sw - w) / 2;
int y = (sh - h) / 2 - 40;
x = x > 0 ? x : 0;
y = y > 0 ? y : 0;
frame.setBounds(x, y, w, h);
frame.setVisible(true);
}
public static void main(String[] args) {
createGuiAndShow();
}
}