我试图用Java设计一种OrCad，到目前为止，我决定使用不同颜色的线来表示每个组件。我通过绘制线来测试我的代码并且它有效（点击并拖动然后在绘制新线时重新绘制）但是我不知道为什么它现在不再工作了我正在尝试绘制我的组件而不是简单的Line2D。
我有一个类组件和一些基本的派生组件，每个组件都有一个Line2D字段和一个颜色字段。 绘图是通过弹出菜单完成的（用户右键单击以选择组件），然后当他们开始单击并拖动时，会创建一个组件对象并将其添加到一个总是重新绘制的数组中。
这是主要课程：
public class Main {
private static String checked;
public static void main(String[] args)
{
createAndShowGUI();
}
private static void createAndShowGUI()
{
DrawingArea drawingArea = new DrawingArea();
PopUpMenu popup = new PopUpMenu();
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.getContentPane().add(drawingArea);
frame.getContentPane().add(popup);
frame.setSize(900, 500);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
static class PopUpMenu extends JPanel {
public PopUpMenu()
{
setBackground(Color.BLACK);
JPopupMenu pmenu = new JPopupMenu();
JMenuItem resistance = new JMenuItem("Add Resitance");
JMenuItem wire = new JMenuItem("Add Wire");
JMenuItem capacitor = new JMenuItem("Add Capacitor");
JMenuItem source = new JMenuItem("Add Source");
pmenu.add(resistance);
pmenu.add(wire);
pmenu.add(capacitor);
pmenu.add(source);
resistance.addActionListener( new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
checked = "R";
}
});
wire.addActionListener( new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
checked = "W";
}
});
capacitor.addActionListener( new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
checked = "C";
}
});
source.addActionListener( new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
checked = "S";
}
});
addMouseListener( new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if(e.getButton() == MouseEvent.BUTTON3)
{
pmenu.show(e.getComponent(),e.getX(),e.getY());
}
}
});
}
}
static class DrawingArea extends JPanel
{
private ArrayList<Component> lines = new ArrayList<Component>();
private Component shape;
public DrawingArea()
{
setBackground(Color.BLACK);
MyMouseListener ml = new MyMouseListener();
addMouseListener(ml);
addMouseMotionListener(ml);
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
//g2d.setColor( Color.RED );
g2d.setStroke(new BasicStroke(3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
for (Component aux : lines)
{
g2d.setColor(aux.getCul());
g2d.drawLine((int)aux.getLine().getX1(), (int)aux.getLine().getY1(), (int)aux.getLine().getX2(), (int)aux.getLine().getY2());
}
if (shape != null)
{
g2d.draw( shape.getLine() );
}
}
class MyMouseListener extends MouseInputAdapter
{
private Point startPoint;
private Point endPoint;
public void mousePressed(MouseEvent e)
{
startPoint = e.getPoint();
switch(checked)
{
case "W": shape = new Wire();
break;
case "R": shape = new Resistance();
break;
case "C": shape = new Capacitor();
break;
case "S": shape = new Source();
break;
}
lines.add(shape);
}
public Line2D el = null;
public void mouseDragged(MouseEvent e)
{
endPoint = e.getPoint();
el.setLine(startPoint.x, startPoint.y, endPoint.x, endPoint.y);
shape.setLine(el);
repaint();
}
public void mouseReleased(MouseEvent e) {
endPoint = e.getPoint();
el.setLine(startPoint.x, startPoint.y, endPoint.x, endPoint.y);
shape.setLine(el);
repaint();
}
}
}
}
这些是我的组件（我只添加了一个派生类）。
public class Component {
protected double value;
protected Line2D line;
protected int ID;
protected Color cul;
protected String type;
public Component()
{
}
public String getType() {
return type;
}
public Line2D getLine() {
return line;
}
public void setLine(Line2D line) {
this.line = line;
}
public int getID() {
return ID;
}
public void setID(int iD) {
ID = iD;
}
public Color getCul() {
return cul;
}
public int returnX1() {
return (int)line.getP1().getX();
}
public int returnY1() {
return (int)line.getP1().getY();
}
public int returnX2() {
return (int)line.getP2().getX();
}
public int returnY2() {
return (int)line.getP2().getY();
}
}
public class Capacitor扩展Component {
private double value;
private Line2D line;
private int ID;
private Color cul = Color.ORANGE;
private String type = "C";
public Capacitor(){
super();
}
@Override
public String getType() {
// TODO Auto-generated method stub
return type;
}
@Override
public Line2D getLine() {
// TODO Auto-generated method stub
return super.getLine();
}
@Override
public void setLine(Line2D line) {
// TODO Auto-generated method stub
super.setLine(line);
}
@Override
public int getID() {
// TODO Auto-generated method stub
return super.getID();
}
@Override
public void setID(int iD) {
// TODO Auto-generated method stub
super.setID(iD);
}
@Override
public Color getCul() {
// TODO Auto-generated method stub
return cul;
}
@Override
public int returnX1() {
// TODO Auto-generated method stub
return super.returnX1();
}
@Override
public int returnY1() {
// TODO Auto-generated method stub
return super.returnY1();
}
@Override
public int returnX2() {
// TODO Auto-generated method stub
return super.returnX2();
}
@Override
public int returnY2() {
// TODO Auto-generated method stub
return super.returnY2();
}
}
我觉得它与我在鼠标拖放方法中复制线条的方式有关。