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
原文链接：http://twaver.servasoft.com/?p=3945
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