分享超轻量Swing仪表盘组件（带源码）

XDoc发布了8.2.5版本，新版本中增加了扩展组件：刻度盘，用于动态图示化展示数据
现在将它封装成一个Swing组件与大家分享，大家可以稍做调整画出更漂亮的仪表盘

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
 * 刻度盘
 * @author xdoc
 */
public class Tick extends JComponent {
    private static final int VALUE_FONT_SIZE = 18;
    private double from = 0;
    private double to = 10;
    private String type = "line";
    private double major = 1;
    private double minor = 0.1;
    private String value = "";
    private String unit = "";
    public double getFrom() {
        return from;
    }
    public Tick() {
        super();
        this.setPreferredSize(new Dimension(60, 60));
        this.setBackground(Color.WHITE);
    }
    public void setFrom(double from) {
        this.from = from;
    }
    public double getMajor() {
        return major;
    }
    public void setMajor(double major) {
        this.major = major;
    }
    public double getMinor() {
        return minor;
    }
    public void setMinor(double minor) {
        this.minor = minor;
    }
    public double getTo() {
        return to;
    }
    public void setTo(double to) {
        this.to = to;
    }
    public String getType() {
        return type;
    }
    /**
     * 直尺
     */
    public static final String LINE = "line";
    /**
     * 120度圆环
     */
    public static final String RING_120 = "ring120";
    public static final String RING_180 = "ring180";
    public static final String RING_240 = "ring240";
    /**
     * 圆盘
     */
    public static final String CIRCLE = "circle";
    public void setType(String type) {
        this.type = type;
    }
    public String getUnit() {
        return unit;
    }
    public void setUnit(String unit) {
        this.unit = unit;
    }
    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
    public void paintComponent(Graphics g) {
        double w = this.getWidth();
        double h = this.getHeight();
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(this.getBackground());
        g2.fillRect(0, 0, (int) w, (int) h);
        g2.setColor(this.getForeground());
        g2.setStroke(new BasicStroke(1));
        int fontSize = 14;
        g2.setFont(new Font(Font.SERIF, Font.PLAIN, fontSize));
        if (major <= 0) {
            major = to - from;
        }
        if (to > from) {
            if (type.startsWith("ring") || type.equals("circle")) {
                double angle;
                double angleStart;
                if (type.equals("circle")) {
                    angle = 360;
                    angleStart = Math.PI / 2;
                } else {
                    angle = toDouble(type.substring(4));
                    angleStart = (180 + (angle - 180) / 2) / 180 * Math.PI;
                }
                double r = angle <= 180 ? Math.min(w / 2, h) : Math.min(w / 2, h / 2);
                double voff = angle <= 180 ? 0 : r;
                double dunit = (angle / 180 * Math.PI) / (to - from);
                for (int i = 0; i <= (to - from) / major; i++) {
                    g2.draw(new Line2D.Double(Math.cos(angleStart - i * major * dunit) * r + w / 2, h - voff - Math.sin(angleStart - i * major * dunit) * r,
                            Math.cos(angleStart - i * major * dunit) * r * 0.75 + w / 2, h - voff - Math.sin(angleStart - i * major * dunit) * r * 0.75));
                    if (minor > 0 && i < (to - from) / major) {
                        for (int j = 1; j < major / minor; j++) {
                            if (i * major + j * minor < to - from) {
                                g2.draw(new Line2D.Double(Math.cos(angleStart - (i * major + j * minor) * dunit) * r + w / 2, h - voff - Math.sin(angleStart - (i * major + j * minor) * dunit) * r,
                                        Math.cos(angleStart - (i * major + j * minor) * dunit) * r * 0.875 + w / 2, h - voff - Math.sin(angleStart - (i * major + j * minor) * dunit) * r * 0.875));
                            }
                        }
                    }
                }
                if (value.length() > 0) {
                    double val = toDouble(value);
                    GeneralPath p = new GeneralPath();
                    p.moveTo(Math.cos(angleStart - (val - from) * dunit) * r * 0.875 + w / 2, h - voff - Math.sin(angleStart - (val - from) * dunit) * r * 0.875);
                    p.lineTo(Math.cos(angleStart - (val - from) * dunit + Math.PI * 0.5) * 2 + w / 2, h - voff - Math.sin(angleStart - (val - from) * dunit + Math.PI * 0.5) * 2);
                    p.lineTo(Math.cos(angleStart - (val - from) * dunit - Math.PI * 0.5) * 2 + w / 2, h - voff - Math.sin(angleStart - (val - from) * dunit - Math.PI * 0.5) * 2);
                    p.closePath();
                    g2.fill(p);
                }
            } else {
                if (w > h) {
                    double dunit = w / (to - from);
                    for (int i = 0; i <= (to - from) / major; i++) {
                        g2.draw(new Line2D.Double(i * major * dunit, 0, i * major * dunit, h - fontSize));
                        if (i < (to - from) / major && minor > 0) {
                            for (int j = 1; j < major / minor; j++) {
                                g2.draw(new Line2D.Double((i * major + j * minor) * dunit, 0, (i * major + j * minor) * dunit, (h - fontSize) / 2));
                            }
                        }
                    }
                    if (value.length() > 0) {
                        double val = toDouble(value);
                        GeneralPath p = new GeneralPath();
                        p.moveTo((val - from) * dunit, (h - fontSize) / 2);
                        p.lineTo((val - from) * dunit - 4, h - fontSize);
                        p.lineTo((val - from) * dunit + 4, h - fontSize);
                        p.closePath();
                        g2.fill(p);
                    }
                } else {
                    int max = (int) Math.max(getStrBounds(g2, format(from)).getWidth(), getStrBounds(g2, format(to)).getWidth());
                    double dunit = h / (to - from);
                    for (int i = 0; i <= (to - from) / major; i++) {
                        g2.draw(new Line2D.Double(0, h - i * major * dunit, w - max, h - i * major * dunit));
                        if (i < (to - from) / major && minor > 0) {
                            for (int j = 1; j < major / minor; j++) {
                                g2.draw(new Line2D.Double(0, h - (i * major + j * minor) * dunit, (w - max) / 2, h - (i * major + j * minor) * dunit));
                            }
                        }
                    }
                    if (value.length() > 0) {
                        double val = toDouble(value);
                        GeneralPath p = new GeneralPath();
                        p.moveTo((w - max) / 2, h - (val - from) * dunit);
                        p.lineTo(w - max, h - (val - from) * dunit - 4);
                        p.lineTo(w - max, h - (val - from) * dunit + 4);
                        p.closePath();
                        g2.fill(p);
                    }
                }
            }
        }
        if (to > from) {
            if (major > 0) {
                if (type.startsWith("ring") || type.equals("circle")) {
                    double angle;
                    double angleStart;
                    if (type.equals("circle")) {
                        angle = 360;
                        angleStart = Math.PI / 2;
                    } else {
                        angle = toDouble(type.substring(4));
                        angleStart = (180 + (angle - 180) / 2) / 180 * Math.PI;
                    }
                    double r = angle <= 180 ? Math.min(w / 2, h) : Math.min(w / 2, h / 2);
                    double voff = angle <= 180 ? 0 : r;
                    double dunit = (angle / 180 * Math.PI) / (to - from);
                    int xoff = 0;
                    int yoff = 0;
                    double strAngle;
                    for (int i = type.equals("circle") ? 1 : 0; i <= (to - from) / major; i++) {
                        String str;
                        str = format(from + i * major);
                        strAngle = (angleStart - i * major * dunit + Math.PI * 2) % (Math.PI * 2);
                        xoff = 0;
                        yoff = 0;
                        if (strAngle >= 0 && strAngle < Math.PI * 0.25) {
                            xoff = (int) -getStrBounds(g2, str).getWidth();
                            yoff = fontSize / 2;
                            if (strAngle == 0 && angle == 180) {
                                yoff = 0;
                            }
                        } else if (near(strAngle, Math.PI * 0.5)) {
                            xoff = (int) -getStrBounds(g2, str).getWidth() / 2;
                            yoff = fontSize;
                        } else if (strAngle >= Math.PI * 0.25 && strAngle < Math.PI * 0.5) {
                            xoff = (int) -getStrBounds(g2, str).getWidth();
                            yoff = fontSize;
                        } else if (strAngle >= Math.PI * 0.5 && strAngle < Math.PI * 0.75) {
                            yoff = fontSize;
                        } else if (strAngle >= Math.PI * 0.75 && strAngle < Math.PI) {
                            yoff = fontSize / 2;
                        } else if (near(strAngle, Math.PI)) {
                            xoff = 1;
                            yoff = fontSize / 2;
                            if (angle == 180) {
                                yoff = 0;
                            }
                        } else if (strAngle >= Math.PI && strAngle < Math.PI * 1.25) {
                            yoff = fontSize / 4;
                        } else if (near(strAngle, Math.PI * 1.5)) {
                            xoff = (int) -getStrBounds(g2, str).getWidth() / 2;
                        } else if (strAngle >= Math.PI * 1.5 && strAngle < Math.PI * 2) {
                            xoff = (int) -getStrBounds(g2, str).getWidth();
                        }
                        g2.drawString(str, (int) (Math.cos(strAngle) * r * 0.75 + w / 2) + xoff, (int) (h - voff - Math.sin(strAngle) * r * 0.75) + yoff);
                    }
                    g2.setFont(new Font("", Font.BOLD, VALUE_FONT_SIZE));
                    if (value.length() > 0) {
                        voff = angle <= 180 ? 10 : r - fontSize / 2;
                        drawValue(g2, value + unit, (int) (w / 2 - getStrBounds(g2, value).getWidth() / 2), (int) (h - voff));
                    }
                } else {
                    if (w > h) {
                        double dunit = w / (to - from);
                        int off = 0;
                        String str;
                        for (int i = 0; i <= (to - from) / major; i++) {
                            str = format(from + i * major);
                            if (i == 0) {
                                str += unit;
                                off = 0;
                            } else if (i == (to - from) / major) {
                                off = (int) -getStrBounds(g2, str).getWidth();
                            } else {
                                off = (int) (-getStrBounds(g2, str).getWidth() / 2);
                            }
                            g2.drawString(str, (int) (i * major * dunit) + off, (int) (h - 2));
                        }
                        if (value.length() > 0) {
                            double val = toDouble(value);
                            value = format(val);
                            if (val == from) {
                                off = 0;
                            } else if (val == to) {
                                off = (int) -getStrBounds(g2, value + unit).getWidth();
                            } else {
                                off = (int) (-getStrBounds(g2, value + unit).getWidth() / 2);
                            }
                            if ((h - fontSize) / 2 >= fontSize) {
                                drawValue(g2, value + unit, (int) ((val - from) * dunit) + off, (int) ((h - fontSize) / 2));
                            } else {
                                drawValue(g2, value + unit, (int) ((val - from) * dunit) + off, fontSize);
                            }
                        }
                    } else {
                        double dunit = h / (to - from);
                        int max = (int) Math.max(getStrBounds(g2, format(from)).getWidth(), getStrBounds(g2, format(to)).getWidth());
                        int off = 0;
                        for (int i = 0; i <= (to - from) / major; i++) {
                            if (i == 0) {
                                off = 0;
                            } else if (i == (to - from) / major) {
                                off = fontSize;
                            } else {
                                off = fontSize / 2;
                            }
                            g2.drawString(format(from + i * major), (int) (w - max + 1), (int) (h - i * major * dunit) + off);
                        }
                        if (unit.length() > 0) {
                            g2.drawString(unit, (int) ((w - max) / 2 + 1), (int) (h - fontSize));
                        }
                        if (value.length() > 0) {
                            double val = toDouble(value);
                            value = format(val);
                            if (val == 0) {
                                off = 0;
                            } else if (val == to) {
                                off = VALUE_FONT_SIZE;
                            } else {
                                off = VALUE_FONT_SIZE / 2;
                            }
                            drawValue(g2, value + unit, (int) ((w - getStrBounds(g2, value + unit).getWidth()) / 2), (int) (h - (val - from) * dunit + off));
                        }
                    }
                }
            }
        }
    }
    private void drawValue(Graphics2D g2, String value, int x, int y) {
        g2.setFont(new Font(Font.SERIF, Font.BOLD, VALUE_FONT_SIZE));
        g2.drawString(value, x, y);
    }
    private String format(double d) {
        if ((int) d == d) {
            return String.valueOf((int) d);
        } else {
            return String.valueOf(d);
        }
    }
    private double toDouble(String string) {
        try {
            return Double.valueOf(string);
        } catch (Exception e) {
            return 0;
        }
    }
    private boolean near(double d1, double d2) {
        return Math.round(d1 * 1000000) == Math.round(d2 * 1000000);
    }
    private static Rectangle2D getStrBounds(Graphics2D g, String str) {
        Font f = g.getFont();
        Rectangle2D rect = f.getStringBounds(str, g.getFontRenderContext());
        if (rect.getHeight() < f.getSize()) {
            rect.setFrame(rect.getX(), rect.getY(), rect.getWidth(), f.getSize() + 1);
        }
        return rect;
    }
    public static void main(String[] args) {
        try {
            JFrame f = new JFrame("刻度盘测试");
            Container p = f.getContentPane();
            Tick tick;
            tick = new Tick();
            tick.setType(Tick.LINE);
            tick.setValue("3");
            tick.setUnit("CM");
            p.add(tick, BorderLayout.NORTH);
            tick = new Tick();
            tick.setType(Tick.LINE);
            p.add(tick, BorderLayout.WEST);
            JPanel panel = new JPanel(new GridLayout(2, 2));
            tick = new Tick();
            tick.setForeground(Color.BLUE);
            tick.setType(Tick.RING_120);
            tick.setValue("3.5");
            tick.setUnit("A");
            panel.add(tick);
            tick = new Tick();
            tick.setType(Tick.RING_180);
            tick.setValue("6");
            tick.setUnit("V");
            panel.add(tick);
            tick = new Tick();
            tick.setType(Tick.RING_240);
            tick.setValue("3");
            tick.setUnit("Kg");
            panel.add(tick);
            tick = new Tick();
            tick.setType(Tick.CIRCLE);
            tick.setValue("3");
            tick.setUnit("Kg");
            tick.setBackground(Color.BLACK);
            tick.setForeground(Color.WHITE);
            panel.add(tick);
            p.add(panel, BorderLayout.CENTER);
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setSize(640, 480);
            f.setVisible(true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

虽然很简单，但放入XDoc中小虫就变小龙了，看看在XDoc中的表现吧：

效果很不错，背景似乎太单调了。

小虫就变小龙 确实变了

建议背景搞一张仪表盘的图片

这个组件先对来说还是比较简单，可以加些代码美化一下，比如：修改线的颜色，增加填充，加背景图等

好想法

如果配合上数据，显示效果就出来了

怎么把代码调整后运行得到后面那么漂亮的图形啊。
有XDoc，但是不知怎么加入。请求楼主回答。

看看图吧：

 

要把四个表重叠到一起，或者大表套小表怎么弄呢？有解决方案吗？