瞧咱办公室的拓扑图

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Swing thread 数据结构互联网编程

前几天的《Swing版小小网管》让我想起前阵子做过的一个企业网管项目。客户是一个工厂，搞生产制造的。人并不多，四、五十人，多数是车间工人。办公室的也就二十多人，网络结构并不复杂：ADSL宽带接入，加上几个AP进行信号扩展；台式机、服务器、笔记本电脑，加上零星的手机上网，仅此而已。大伙知道：做企业网管是比较艰难的，工作量大，吃力不讨好，竞争激烈，卖不了几个钱，不容易啊！但是为了能够在项目中多点筹码，界面还是要做的精益求精才行。

先到工厂详细调研了网络结构图，并绘制了一个简单的草图结构（不好意思，写字越来越难看了，还不如我小学时候的水平，都是电脑键盘给害的哈）：

其中ADSL和几个无线AP是网络主干，各个办公室的结构都是星形结构，通过网线进行汇聚，通过AP进行互联。我问工厂的车间主任为啥这样搞，他说使用AP的原因是工厂正在进行改造，几个办公室之间距离较远，隔着一个大院子，网线铺设不便；另外几个车间里头也有电脑需要联网，在嘈杂混乱火星直冒的车间里头，弄网线就更麻烦了。

要在网管里面呈现和监控这个网络，对俺来说不算难事。不过我需要一个好看一点的流量监控的图表。首先通过SNMP获取AP中的iftable中的端口，并获取其实时流量，然后放置在拓扑图的link对象中。为了不给网络造成太多负担，网管默认每5秒钟获取一次数值，并存储连续100个数值，多余的抛弃。

绘制chart的图并不复杂，整个chart呈一个长矩形状，分为三段（老、中、轻），用不同的颜色进行渲染。

Java代码

public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2d = (Graphics2D) g;
Rectangle bounds = getBounds();
g2d.setColor(background);
g2d.fill(bounds);
Point location = bounds.getLocation();
int startX = location.x;
int startY = location.y + chartHeight;
GeneralPath path = new GeneralPath();
path.moveTo(startX, startY);
int[] values = getChartDataValues();
for (int i = 0; i < values.length; i++) {
path.lineTo(startX + i, startY - values[i]);
}
path.lineTo(startX + chartWidth, startY);
path.closePath();
g2d.setColor(chartColor1);
g2d.fill(path);
//clip center part, paint with color2.
Shape oldClip = g2d.getClip();
Rectangle clip = new Rectangle(bounds.x + chartWidth / 4, bounds.y, chartWidth / 2, chartHeight);
g2d.setClip(clip);
g2d.setColor(chartColor2);
g2d.fill(path);
g2d.setClip(oldClip);
g2d.setColor(Color.lightGray);
g2d.draw(bounds);
g2d.setColor(Color.darkGray);
g2d.setFont(font);
int textX = location.x + 5;
int textY = location.y + chartHeight / 2 + font.getSize() / 2;
g2d.drawString("Sum", textX, textY);
int speed = 100;
if (getElementUI().getElement() instanceof MyLink) {
speed = ((MyLink) getElementUI().getElement()).getSpeed();
}
String text = NumberFormat.getInstance().format(speed) + " kbit/s";
Rectangle2D textBounds = g2d.getFontMetrics().getStringBounds(text, g2d);
textX = (int) (location.x + chartWidth - textBounds.getWidth() - 5);
g2d.drawString(text, textX, textY);
}

public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2d = (Graphics2D) g;

    Rectangle bounds = getBounds();

    g2d.setColor(background);
    g2d.fill(bounds);

    Point location = bounds.getLocation();
    int startX = location.x;
    int startY = location.y + chartHeight;
    GeneralPath path = new GeneralPath();
    path.moveTo(startX, startY);

    int[] values = getChartDataValues();

    for (int i = 0; i < values.length; i++) {
        path.lineTo(startX + i, startY - values[i]);
    }
    path.lineTo(startX + chartWidth, startY);
    path.closePath();

    g2d.setColor(chartColor1);
    g2d.fill(path);

    //clip center part, paint with color2.
    Shape oldClip = g2d.getClip();
    Rectangle clip = new Rectangle(bounds.x + chartWidth / 4, bounds.y, chartWidth / 2, chartHeight);
    g2d.setClip(clip);
    g2d.setColor(chartColor2);
    g2d.fill(path);
    g2d.setClip(oldClip);

    g2d.setColor(Color.lightGray);
    g2d.draw(bounds);

    g2d.setColor(Color.darkGray);
    g2d.setFont(font);

    int textX = location.x + 5;
    int textY = location.y + chartHeight / 2 + font.getSize() / 2;
    g2d.drawString("Sum", textX, textY);

    int speed = 100;
    if (getElementUI().getElement() instanceof MyLink) {
        speed = ((MyLink) getElementUI().getElement()).getSpeed();
    }
    String text = NumberFormat.getInstance().format(speed) + " kbit/s";
    Rectangle2D textBounds = g2d.getFontMetrics().getStringBounds(text, g2d);
    textX = (int) (location.x + chartWidth - textBounds.getWidth() - 5);
    g2d.drawString(text, textX, textY);
}

显示效果如下：

另外，对连线的效果也进行了一些处理。用直线连接无疑太土气了，来点曲线增加一点趣味。曲线用一个对称的抛物线来处理，根据不同的角度进行自动调整：

Java代码

public GeneralPath getPath() {
Point from = this.getFromPoint();
Point to = this.getToPoint();
Point middle = new Point((from.x + to.x) / 2, (from.y + to.y) / 2);
boolean wider = (Math.abs(from.x - to.x) > Math.abs(from.y - to.y));
GeneralPath myPath = new GeneralPath();
myPath.moveTo(from.x, from.y);
if (wider) {
myPath.quadTo(middle.x, from.y, middle.x, middle.y);
myPath.quadTo(middle.x, to.y, to.x, to.y);
} else {
myPath.quadTo(from.x, middle.y, middle.x, middle.y);
myPath.quadTo(to.x, middle.y, to.x, to.y);
}
return myPath;
}

public GeneralPath getPath() {
    Point from = this.getFromPoint();
    Point to = this.getToPoint();
    Point middle = new Point((from.x + to.x) / 2, (from.y + to.y) / 2);
    boolean wider = (Math.abs(from.x - to.x) > Math.abs(from.y - to.y));
    GeneralPath myPath = new GeneralPath();
    myPath.moveTo(from.x, from.y);
    if (wider) {
        myPath.quadTo(middle.x, from.y, middle.x, middle.y);
        myPath.quadTo(middle.x, to.y, to.x, to.y);
    } else {
        myPath.quadTo(from.x, middle.y, middle.x, middle.y);
        myPath.quadTo(to.x, middle.y, to.x, to.y);
    }

    return myPath;
}

其实我发现，虽然咱写程序的号称数学都必须很非常贼NB，可是真正的几何和数学真的都忘的差不多了，不知道你还能不能随手写下二次方程的根，椭圆的几何方程，或者球体的面积公式？反正我是不行了。

不管咋说，俺还是九牛二虎之下整出了几个花里胡哨的path出来。毫无技术含量，你可别被俺忽悠了：

接下来，再把SNMP获得的数据放入link中的chart呈现。为了避免泄密的麻烦，附件的demo俺去掉了这些业务代码，用一个thread模拟代替了：

Java代码

Thread thread = new Thread() {
private Vector links = null;
private Vector getLinks() {
if (links == null) {
links = new Vector();
Iterator it = network.getDataBox().iterator();
while (it.hasNext()) {
Object o = it.next();
if (o instanceof MyLink) {
MyLink link = (MyLink) o;
links.add(link);
}
}
}
return links;
}
@Override
public void run() {
while (true) {
Iterator it = getLinks().iterator();
while (it.hasNext()) {
Object o = it.next();
if (o instanceof MyLink) {
MyLink link = (MyLink) o;
createRandomValue(link);
if (TWaverUtil.getRandomInt(10) == 1) {
link.setSpeed(TWaverUtil.getRandomInt(10000));
}
}
}
try {
Thread.sleep(100);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
private void createRandomValue(MyLink link) {
int value = link.getLastChartValue();
int change = TWaverUtil.getRandomInt(3) - 1;
value = value + change;
value = Math.min(value, 100);
value = Math.max(value, 0);
link.addChartValue(value);
}
};
thread.start();

    Thread thread = new Thread() {

        private Vector links = null;

        private Vector getLinks() {
            if (links == null) {
                links = new Vector();
                Iterator it = network.getDataBox().iterator();
                while (it.hasNext()) {
                    Object o = it.next();
                    if (o instanceof MyLink) {
                        MyLink link = (MyLink) o;
                        links.add(link);
                    }
                }
            }
            return links;
        }

        @Override
        public void run() {
            while (true) {
                Iterator it = getLinks().iterator();
                while (it.hasNext()) {
                    Object o = it.next();
                    if (o instanceof MyLink) {
                        MyLink link = (MyLink) o;
                        createRandomValue(link);
                        if (TWaverUtil.getRandomInt(10) == 1) {
                            link.setSpeed(TWaverUtil.getRandomInt(10000));
                        }
                    }
                }
                try {
                    Thread.sleep(100);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }

        private void createRandomValue(MyLink link) {
            int value = link.getLastChartValue();
            int change = TWaverUtil.getRandomInt(3) - 1;
            value = value + change;

            value = Math.min(value, 100);
            value = Math.max(value, 0);

            link.addChartValue(value);
        }
    };
    thread.start();
}

再到google上物色几个清爽的图标。

对了，在结束之际，突然想起一件事：AP上的晃悠悠的电线丝，可不是icon的一部反，而是咱draw上去的！这个小亮点咱得说说：主要思路就是new一个path，模拟其曲线的路径，然后在Swing的paint时候给附加上去。代码如下：

Java代码

@Override
public void paintBody(Graphics2D g2d) {
super.paintBody(g2d);
if (((MyNode) getElement()).isWireVisible()) {
Object oldValue = g2d.getRenderingHint(RenderingHints.KEY_ANTIALIASING);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(wireColor);
g2d.setStroke(TWaverConst.BASIC_STROKE);
g2d.draw(createWireShape());
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, oldValue);
}
}
private Shape createWireShape() {
Point point = this.getHotspot();
int x = point.x - 25;
int y = point.y + 23;
GeneralPath path = new GeneralPath();
path.moveTo(x, y);
path.curveTo(x + 20, y - 20, x + 50, y - 10, x + 48, y);
path.curveTo(x + 48, y + 15, x + 10, y + 10, x + 12, y - 5);
path.curveTo(x + 12, y - 20, x + 50, y - 20, x + 53, y);
path.quadTo(x + 53, y + 3, x + 51, y + 5);
return path;
}

    @Override
    public void paintBody(Graphics2D g2d) {
        super.paintBody(g2d);

        if (((MyNode) getElement()).isWireVisible()) {
            Object oldValue = g2d.getRenderingHint(RenderingHints.KEY_ANTIALIASING);
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setColor(wireColor);
            g2d.setStroke(TWaverConst.BASIC_STROKE);
            g2d.draw(createWireShape());
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, oldValue);
        }
    }

    private Shape createWireShape() {
        Point point = this.getHotspot();
        int x = point.x - 25;
        int y = point.y + 23;

        GeneralPath path = new GeneralPath();
        path.moveTo(x, y);
        path.curveTo(x + 20, y - 20, x + 50, y - 10, x + 48, y);
        path.curveTo(x + 48, y + 15, x + 10, y + 10, x + 12, y - 5);
        path.curveTo(x + 12, y - 20, x + 50, y - 20, x + 53, y);
        path.quadTo(x + 53, y + 3, x + 51, y + 5);
        return path;
    }

这下终于完整了。看看“晃悠悠的铁丝”效果：

接下来，在程序里面整合一下，整个效果就出来了：