如何用Swing去绘制电力系统图

TWaver作为一款专业的图形界面控件，可以应用在各行各业中。本文我们就来详细介绍一下TWaver如何绘制出电力系统的界面。我们现在看看几张电力系统的图： 

某变电站设备接线图一

某变电所的接线图二

当然这些是我在网上搜索的一些资源，那么TWaver是否能实现这样的界面呢？回答是肯定的，我们先来分析一下，电力电气系统中这些界面都是由很多电气元素组成的，比如变压器，刀闸，开关，接地开关，电容器，发电机等。 接下来我们看看如何去扩展这些电气元素，先整个简单的刀闸，刀闸一般有两种状态，打开关闭，因此我们可以定义一个刀闸的类，继承于ResizableNode,添加turnOn的属性来控制开关状态

public class Switch extends ResizableNode{
	private boolean turnOn = true;

	public Switch() {
		super();
		init();
	}

	public Switch(Object id){
		super(id);
		init();
	}

	private void init(){
		this.setSize(5,30);
		this.putBorderColor(Color.black);
		this.putBorderInsets(12);
	}

	 public String getUIClassID() {
        return SwitchUI.class.getName();
    }

	 public boolean isTurnOn() {
		return turnOn;
	}

	 public void setTurnOn(boolean turnOn) {
		if(this.turnOn != turnOn){
			boolean oldValue = this.turnOn;
			this.turnOn = turnOn;
			this.firePropertyChange("turnOn", oldValue, this.turnOn);
		}
	}
}

接着需要在UI上需要根据turnOn的属性来绘制开关的形状，下面贴一下主要的paint方法

public void paintBody(Graphics2D g) {
	g.setStroke(TWaverConst.DOUBLE_WIDTH_STROKE);

	Switch switzh = (Switch)this.getElement();

	//get position
	final Point location = switzh.getLocation();
	final Dimension size = switzh.getSize();
	boolean trunOn = switzh.isTurnOn();
	final int x = location.x;
	final int y = location.y;
	final int width = size.width;
	final int height = size.height;

	//draw color frame
	g.setColor(new Color(170,0,225));
	g.drawOval(x, y, width, width);
	g.drawOval(x, y+height-width, width, width);

	if(trunOn){
		g.drawLine(x+width/2, y+height-width, x+height/2,y+width);
	}else{
		g.drawLine(x+width/2, y+height-width, x+width/2, y+width);
	}
}

通过一个main来运行看看扩展出来的效果：

这是简单的刀闸元素，扩展起来还是比较容易的。接下来来个稍微复杂一点的--接地开关，同样它和刀闸一样，也有两种状态 

这个例子中我们给接地开关设置了几个不同的方向，同样上面的也可以这么做一下处理，我们来看看如何绘制这个接地开关的

public void paintBody(Graphics2D g) {
	g.setStroke(TWaverConst.BASIC_STROKE);
	g.setColor(Color.black)

	EarthingSwitch earthingSwitch = (EarthingSwitch)this.getElement();
	final Point location = earthingSwitch.getLocation();

	boolean turnOn = earthingSwitch.isTurnOn();
	int position = earthingSwitch.getSwitchPosition();
	final int x = location.x;
	final int y = location.y;
	int width = earthingSwitch.getWidth();
	int height = earthingSwitch.getHeight();
	//draw body
	if(turnOn){
		if(position == Utils.SWITCH_POSITION_TOP){
			g.drawLine(x+width/4, y, x+width/4*3, y);
			g.drawLine(x+width/6, y+2, x+width/6*5, y+2);
			g.drawLine(x, y+4, x+width, y+4);
			g.drawLine(x+width/2, y+4, x+width/2, y+7);
			g.drawLine(x+width/2, y+7, x+width, y+height-10);
			g.drawLine(x+width/2, y+height-3, x+width/2, y+height);
		}else if(position == Utils.SWITCH_POSITION_LEFT){
			//transfer width and height
			int middle = width;
			width = height;
			height = middle;

			g.drawLine(x,y+height/4, x, y+height/4*3);
			g.drawLine(x+2, y+height/6, x+2, y+height/6*5);
			g.drawLine(x+4, y, x+4, y+height);
			g.drawLine(x+4, y+height/2, x+7, y+height/2);
			g.drawLine(x+7, y+height/2, x+width-10, y);
			g.drawLine(x+width-3, y+height/2, x+width, y+height/2);
		}else if(position == Utils.SWITCH_POSITION_BOTTOM){
			g.drawLine(x+width/4, y+height, x+width/4*3, y+height);
			g.drawLine(x+width/6, y+height-2, x+width/6*5, y+height-2);
			g.drawLine(x, y+height-4, x+width, y+height-4);
			g.drawLine(x+width/2, y+height-4, x+width/2, y+height-7);
			g.drawLine(x+width/2, y+height-7, x, y+10);
			g.drawLine(x+width/2, y+3, x+width/2, y);
		}else if(position == Utils.SWITCH_POSITION_RIGHT){
			//transfer width and height
			int middle = width;
			width = height;
			height = middle;

			g.drawLine(x+width,y+height/4, x+width, y+height/4*3);
			g.drawLine(x+width-2, y+height/6, x+width-2, y+height/6*5);
			g.drawLine(x+width-4, y, x+width-4, y+height);
			g.drawLine(x+width-4, y+height/2, x+width-7, y+height/2);
			g.drawLine(x+width-7, y+height/2, x+10, y);
			g.drawLine(x+3, y+height/2, x, y+height/2);
		}
	}else{
		if(position == Utils.SWITCH_POSITION_TOP){
			g.drawLine(x+width/4, y, x+width/4*3, y);
			g.drawLine(x+width/6, y+2, x+width/6*5, y+2);
			g.drawLine(x, y+4, x+width, y+4);
			g.drawLine(x+width/2, y+4, x+width/2, y+7);
			g.drawLine(x+width/2, y+7, x+width/2, y+height-3);
			g.drawLine(x+width/2, y+height-3, x+width/2, y+height);
		}else if(position == Utils.SWITCH_POSITION_LEFT){
			//transfer width and height
			int middle = width;
			width = height;
			height = middle;

			g.drawLine(x,y+height/4, x, y+height/4*3);
			g.drawLine(x+2, y+height/6, x+2, y+height/6*5);
			g.drawLine(x+4, y, x+4, y+height);
			g.drawLine(x+4, y+height/2, x+7, y+height/2);
			g.drawLine(x+7, y+height/2, x+width-3, y+height/2);
			g.drawLine(x+width-3, y+height/2, x+width, y+height/2);
		}else if(position == Utils.SWITCH_POSITION_BOTTOM){
			g.drawLine(x+width/4, y+height, x+width/4*3, y+height);
			g.drawLine(x+width/6, y+height-2, x+width/6*5, y+height-2);
			g.drawLine(x, y+height-4, x+width, y+height-4);
			g.drawLine(x+width/2, y+height-4, x+width/2, y+height-7);
			g.drawLine(x+width/2, y+height-7, x+width/2, y+3);
			g.drawLine(x+width/2, y+3, x+width/2, y);
		}else if(position == Utils.SWITCH_POSITION_RIGHT){
			//transfer width and height
			int middle = width;
			width = height;
			height = middle;

			g.drawLine(x+width,y+height/4, x+width, y+height/4*3);
			g.drawLine(x+width-2, y+height/6, x+width-2, y+height/6*5);
			g.drawLine(x+width-4, y, x+width-4, y+height);
			g.drawLine(x+width-4, y+height/2, x+width-7, y+height/2);
			g.drawLine(x+width-7, y+height/2, x+3, y+height/2);
			g.drawLine(x+3, y+height/2, x, y+height/2);
		}
	}
}

还有一些其他的元素，比如开关，发电机，变压器这些可以直接通过TWaver提供的customDraw很容易的配置出来，这些就比较简单了，此处代码省略100字，直接上图了 

有了这些基础的元素，那么来绘制电力系统界面就显得不是那么复杂了，我们通过上面扩展的这些电力元素用twaver的工具画出了一个电力系统图，如下：

最后我们可以在界面上加上交互，比如双击打开关闭刀闸开关，然后添加自己的业务，这样一个简单的电力系统界面就完成了

network.addElementDoubleClickedActionListener(new ActionListener(){
	public void actionPerformed(ActionEvent e) {
		Element ele = network.getSelectionModel().lastElement();
		if(ele instanceof Switch){
			boolean turnOn = ((Switch)ele).isTurnOn();
			((Switch)ele).setTurnOn(!turnOn);
		}
	}
});

同样最先贴出来的两张变电所的图是不是也就很容易的做出来呢!最后再附上TWaver做的另一张电力界面图