摘要:使用Draw2d ,画图,连线,可拖动图像,连线跟着移动。
1,代码:
public class Connection {
public static void main(String args[]) {
Shell shell = new Shell();
shell.setSize(350, 350);
shell.open();
shell.setText("Connection Demo");
LightweightSystem lws = new LightweightSystem(shell);
IFigure panel = new Figure();
lws.setContents(panel);
// 创建两个四边形的图形实例
RectangleFigure node1 = new RectangleFigure(), node2 = new RectangleFigure();
// 设置node1的背景色
node1.setBackgroundColor(ColorConstants.red);
// 设置node1的大小和位置
node1.setBounds(new Rectangle(30, 30, 64, 36));
// 设置node2的背景色
node2.setBackgroundColor(ColorConstants.blue);
// 设置node2的大小和位置
node2.setBounds(new Rectangle(100, 100, 64, 36));
// 创建一个连线的实例
PolylineConnection conn = new PolylineConnection();
// 设置连线起点的锚点
conn.setSourceAnchor(new ChopboxAnchor(node1));
// 设置连线目标的锚点
conn.setTargetAnchor(new ChopboxAnchor(node2));
// 设置连线目标的装饰器
conn.setTargetDecoration(new PolygonDecoration());
Label label = new Label("Midpoint");
label.setOpaque(true);
label.setBackgroundColor(ColorConstants.buttonLightest);
label.setBorder(new LineBorder());
// 添加连线的Locator
conn.add(label, new MidpointLocator(conn, 0));
// 在底层Figure中添加子Figure
panel.add(node1);
panel.add(node2);
panel.add(conn);
// 添加node1拖动的监听器
new Dragger(node1);
// 添加node2拖动的监听器
new Dragger(node2);
Display display = Display.getDefault();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
}
static class Dragger extends MouseMotionListener.Stub implements MouseListener{
private Point last;
public Dragger(IFigure figure) {
figure.addMouseMotionListener(this);
figure.addMouseListener(this);
}
public void mouseDoubleClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
last = e.getLocation();
}
public void mouseReleased(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
Point p = e.getLocation();
Dimension delta = p.getDifference(last);
last = p;
Figure f = (Figure) e.getSource();
//设置拖动的Figure的位置
f.setBounds(f.getBounds().getTranslated(delta.width,delta.height));
}
}
}
图像: