示例#1
0
    @Override
    public void mouseDragged(MouseEvent e) {
      last = e.getPoint(); // Save cursor position

      if (buttonState == MouseEvent.BUTTON1) {
        if (tempElement == null) { // Is there an element?
          tempElement =
              Element.createElement( // No, so create one
                  theApp.getWindow().getElementType(),
                  theApp.getWindow().getElementColor(),
                  start,
                  last);
        } else {
          tempElement.draw(g2D); // Yes – draw to erase it
          tempElement.modify(start, last); // Now modify it
        }
        tempElement.draw(g2D); // and draw it
      }
    }