Swing：绘制渐变的饼图
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GeometryUtil.java
import java.awt.geom.Point2D; public class GeometryUtil { // 两点之间的距离 public static double distanceOfPoints(Point2D p1, Point2D p2) { double disX = p2.getX() - p1.getX(); double disY = p2.getY() - p1.getY(); double dis = Math.sqrt(disX * disX + disY * disY); return dis; } // 两点的中点 public static Point2D middlePoint(Point2D p1, Point2D p2) { double x = (p1.getX() + p2.getX()) / 2; double y = (p1.getY() + p2.getY()) / 2; return new Point2D.Double(x, y); } // 在两点所在直线上，以从startPoint到endPoint为方向，离startPoint的距离disToStartPoint的点 public static Point2D extentPoint(Point2D startPoint, Point2D endPoint, double disToStartPoint) { double disX = endPoint.getX() - startPoint.getX(); double disY = endPoint.getY() - startPoint.getY(); double dis = Math.sqrt(disX * disX + disY * disY); double sin = (endPoint.getY() - startPoint.getY()) / dis; double cos = (endPoint.getX() - startPoint.getX()) / dis; double deltaX = disToStartPoint * cos; double deltaY = disToStartPoint * sin; return new Point2D.Double(startPoint.getX() + deltaX, startPoint.getY() + deltaY); }}
Pie3D.java
import java.awt.Color;import java.awt.geom.Arc2D;import java.awt.geom.Area;import java.awt.geom.GeneralPath;import java.awt.geom.Point2D;class Pie3D { private Arc2D arc; // 这里的弧并不是圆上的一弧，而是椭圆的一部分. private Area frontSite; private Area leftSite; private Area rightSite; private Color color; private Pie3D selectedPie; private Point2D arcMiddle; private Point2D labelPosition; private double value; private int shadowDepth; private double selectedShiftDis; // 被选中的饼图在他的中线上移动的距离 public Pie3D(Arc2D arc, Color color, double value) { this(arc, color, value, 10, 30); } public Pie3D(Arc2D arc, Color color, double value, int shadowDepth, double selectedShiftDis) { this.arc = arc; this.color = color; this.value = value; this.selectedShiftDis = selectedShiftDis; this.shadowDepth = shadowDepth; Arc2D arcBottom = new Arc2D.Double(arc.getX(), arc.getY() + shadowDepth, arc.getWidth(), arc.getHeight() + 0, arc.getAngleStart(), arc.getAngleExtent(), Arc2D.CHORD); Point2D[] topPs = getPointsOfArc(arc); Point2D[] bottomPs = getPointsOfArc(arcBottom); // Front site GeneralPath font = new GeneralPath(); font.moveTo(topPs[1].getX(), topPs[1].getY()); font.lineTo(topPs[2].getX(), topPs[2].getY()); font.lineTo(bottomPs[2].getX(), bottomPs[2].getY()); font.lineTo(bottomPs[1].getX(), bottomPs[1].getY()); font.closePath(); this.frontSite = new Area(arcBottom); this.frontSite.add(new Area(font)); // Left site GeneralPath left = new GeneralPath(); left.moveTo(topPs[0].getX(), topPs[0].getY()); left.lineTo(topPs[1].getX(), topPs[1].getY()); left.lineTo(bottomPs[1].getX(), bottomPs[1].getY()); left.lineTo(topPs[0].getX(), topPs[0].getY() + 3); left.closePath(); this.leftSite = new Area(left); // Right site GeneralPath right = new GeneralPath(); right.moveTo(topPs[0].getX(), topPs[0].getY()); right.lineTo(topPs[2].getX(), topPs[2].getY()); right.lineTo(bottomPs[2].getX(), bottomPs[2].getY()); right.lineTo(topPs[0].getX(), topPs[0].getY() + 3); right.closePath(); this.rightSite = new Area(right); arcMiddle = calculateArcMiddle(); // Label position: 五分之四处 Point2D c = getPieCenter(); // Point2D m = getChordMiddle(); Point2D m = arcMiddle; double dis = GeometryUtil.distanceOfPoints(c, m) * 0.8; labelPosition = GeometryUtil.extentPoint(c, m, dis); } // 取得Arc上的三个点，在对Arc: center, left, right. public static Point2D[] getPointsOfArc(Arc2D arc) { Point2D center = new Point2D.Double(arc.getCenterX(), arc.getCenterY()); Point2D left = arc.getStartPoint(); Point2D right = arc.getEndPoint(); Point2D[] points = new Point2D[] { center, left, right }; return points; } public Pie3D getSelectedPie() { if (selectedPie == null) { selectedPie = createSeletecdPie(); } return selectedPie; } private Pie3D createSeletecdPie() { // 沿中线方向移动selectedShiftDis个单位 Point2D c = getPieCenter(); Point2D m = getChordMiddle(); Point2D p = GeometryUtil.extentPoint(c, m, selectedShiftDis); double deltaX = p.getX() - c.getX(); double deltaY = p.getY() - c.getY(); double x = arc.getX() + deltaX; double y = arc.getY() + deltaY; Arc2D shiftArc = (Arc2D) arc.clone(); shiftArc.setFrame(x, y, arc.getWidth(), arc.getHeight()); return new Pie3D(shiftArc, color, value, shadowDepth, selectedShiftDis); } public Arc2D getArc() { return arc; } public Area getFrontSite() { return frontSite; } public Area getLeftSite() { return leftSite; } public Area getRightSite() { return rightSite; } public Color getColor() { return color; } public void setColor(Color color) { this.color = color; } public Point2D getLabelPosition() { return labelPosition; } public void setLabelPosition(Point2D labelPosition) { this.labelPosition = labelPosition; } public double getValue() { return value; } public String getLabel() { return value + "%"; } // 弦的中心点 public Point2D getChordMiddle() { return GeometryUtil.middlePoint(arc.getStartPoint(), arc.getEndPoint()); } // 饼图的圆心 public Point2D getPieCenter() { return new Point2D.Double(arc.getCenterX(), arc.getCenterY()); } // 弧上的中心点 public Point2D getArcMiddle() { return arcMiddle; } private Point2D calculateArcMiddle() { // 创建一个新的弧，其扩展角度为当前弧的一半 return new Arc2D.Double(arc.getX(), arc.getY(), arc.getWidth(), arc.getHeight(), arc.getAngleStart(), arc.getAngleExtent() / 2, Arc2D.PIE).getEndPoint(); }}
PieGradientPainter.java进行测试
import java.awt.Color;import java.awt.FontMetrics;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.LinearGradientPaint;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Toolkit;import java.awt.geom.Arc2D;import java.awt.geom.Point2D;import java.util.ArrayList;import java.util.List;import javax.swing.JFrame;import javax.swing.JPanel;@SuppressWarnings("serial")public class PieGradientPainter extends JPanel { private double[] data; private Color[] colors = createColors(); private Pie3D[] pies; private Pie3D[] outerPies; public PieGradientPainter() { setBackground(Color.DARK_GRAY); data = new double[] { 10, 30, 40, 15, 25, 60 }; int x = 0; int y = 0; int w = 300; int h = 300; int shiftAngle = -30; int delta = 40; outerPies = createPies(x, y, w, h, 0, shiftAngle, data, colors); x += delta / 2; y += delta / 2; w -= delta; h -= delta; pies = createPies(x, y, w, h, 0, shiftAngle, data, colors); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); int paddingLeft = 30; drawLinearPie(g2d, pies, outerPies, paddingLeft, 30); paddingLeft = (int) (outerPies[0].getArc().getWidth()) + paddingLeft * 2; drawRadialPie(g2d, pies, outerPies, paddingLeft, 30); } protected void drawLinearPie(Graphics2D g2d, Pie3D[] pies, Pie3D[] outerPies, int paddingLeft, int paddingTop) { g2d.translate(paddingLeft, paddingTop); int colorIndex = colors.length - 1; double radius = pies[0].getArc().getWidth() / 2; float[] fractions = { 0.0f, 0.55f, 1.0f }; Point2D start = new Point2D.Double(0, pies[0].getPieCenter().getY() - radius); Point2D end = new Point2D.Double(0, pies[0].getPieCenter().getY() + radius * 1.5); for (int i = 0; i < pies.length; ++i) { Pie3D pie = pies[i]; colorIndex = (colorIndex + 1) % colors.length; Color c = colors[colorIndex]; g2d.setColor(c); g2d.fill(outerPies[i].getArc()); // Linear gradiant paint. Color[] cs = { c.darker().darker(), c, Color.WHITE.darker() }; LinearGradientPaint paint = new LinearGradientPaint(start, end, fractions, cs); g2d.setPaint(paint); g2d.fill(pie.getArc()); } drawPieLabel(g2d, pies); g2d.translate(-paddingLeft, -paddingTop); } protected void drawRadialPie(Graphics2D g2d, Pie3D[] pies, Pie3D[] outerPies, int paddingLeft, int paddingTop) { g2d.translate(paddingLeft, paddingTop); int colorIndex = colors.length - 1; Point2D center = pies[0].getPieCenter(); int radius = (int) pies[0].getArc().getWidth(); float[] fractions = { 0.0f, 0.2f, 1.0f }; for (int i = 0; i < pies.length; ++i) { Pie3D pie = pies[i]; colorIndex = (colorIndex + 1) % colors.length; Color c = colors[colorIndex]; g2d.setColor(c); g2d.fill(outerPies[i].getArc()); // Radial gradient paint. Color[] cc = { c.brighter(), c, c.darker().darker().darker() }; RadialGradientPaint paint = new RadialGradientPaint(center, radius, fractions, cc); g2d.setPaint(paint); g2d.fill(pie.getArc()); } drawPieLabel(g2d, pies); g2d.translate(-paddingLeft, -paddingTop); } protected void drawPieLabel(Graphics2D g2d, Pie3D[] pies) { FontMetrics metrics = g2d.getFontMetrics(); g2d.setColor(Color.BLACK); for (int i = 0; i < pies.length; ++i) { Pie3D p = pies[i]; int sw = metrics.stringWidth(p.getLabel()) / 2; int sh = (metrics.getAscent()) / 2; int x = (int) (p.getLabelPosition().getX() - sw); int y = (int) (p.getLabelPosition().getY() + sh); g2d.drawString(p.getLabel(), x, y); } } private Color[] createColors() { // 返回16进制的值颜色 List<Color> colors = new ArrayList<Color>(); colors.add(Color.decode("#635D49")); colors.add(Color.decode("#4D7B20")); colors.add(Color.decode("#FF7321")); colors.add(Color.decode("#BFDD89")); colors.add(Color.decode("#AA6A2D")); colors.add(Color.decode("#9C1594")); colors.add(Color.decode("#00E500")); colors.add(Color.decode("#E2FF55")); colors.add(Color.decode("#D718A5")); colors.add(Color.decode("#BB2100")); colors.add(Color.decode("#D0F15A")); colors.add(Color.decode("#169800")); colors.add(Color.decode("#00DBFF")); colors.add(Color.decode("#00FF00")); return colors.toArray(new Color[0]); } public static Pie3D[] createPies(int x, int y, int w, int h, int shadowDepth, int shiftAngle, double[] data, Color[] colors) { double sum = 0; for (double d : data) { sum += d; } // 初始化Pies double arcAngle = 0; double startAngle = shiftAngle; Pie3D[] pies = new Pie3D[data.length]; for (int i = 0; i < data.length; ++i) { arcAngle = data[i] * 360 / sum; // 使用百分比计算角度 if (i + 1 == data.length) { arcAngle = 360 + shiftAngle - startAngle; // 保证闭合 arcAngle = arcAngle > 0 ? arcAngle : 0; } Arc2D.Double arc = new Arc2D.Double(x, y, w, h, startAngle, arcAngle, Arc2D.PIE); double rate = data[i] / sum * 100 * 100 + 0.5; rate = ((int) rate) / 100.0; pies[i] = new Pie3D(arc, colors[i % colors.length], rate, shadowDepth, 30); startAngle += arcAngle; } return pies; } private static void createGuiAndShow() { JFrame frame = new JFrame("Pie with gradient effects"); frame.getContentPane().add(new PieGradientPainter()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); int sw = Toolkit.getDefaultToolkit().getScreenSize().width; int sh = Toolkit.getDefaultToolkit().getScreenSize().height; int w = 690; int h = 390; 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(); }}
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