Rulers, mouse position
Hi,
I am working on a GUI that also features rulers at the top and on the left side; I have followed the tutorial at http://java.sun.com/docs/books/tutorial/uiswing/components/scrollpane.html -> "How a Scroll Pane Works"; I am not using a scrollpane but a JPanel; my two rulers are JPanels as well. This works perfectly.
Now I would like to draw a vertical / horizontal line in the rulers when I move the mouse in my JPanel - like it's done in various graphics programs.
Here is my code for the rulers:
publicclass Rulersextends JComponent{
privatestaticfinallong serialVersionUID = 1;
privatestaticfinalint SIZE = 20;
publicstaticfinalint HORIZONTAL = 0;
publicstaticfinalint VERTICAL = 1;
privateint tickHeight = 8;
privateint orientation;
public Rulers(int o){
orientation = o;
}
protectedvoid paintComponent(Graphics g){
super.paintComponent(g);
setBorder(BorderFactory.createLineBorder(Color.BLACK));
Graphics2D g2 = (Graphics2D) g;
if (isOpaque()){
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, getWidth(), getHeight());
}
g2.setFont(new Font("SansSerif", Font.PLAIN, 10));
g2.setColor(Color.BLACK);
if (orientation == HORIZONTAL){
for (int i = 0; i < 700; i += 200){
g2.drawLine(i, SIZE, i, SIZE - tickHeight);
}
}else{
for (int i = 0; i < 500; i += 200){
g2.drawLine(SIZE, i, SIZE - tickHeight, i);
}
}
}
}
My main JPanel:
publicclass PlayerMgmtextends JComponentimplements MouseMotionListener{
privatestaticfinallong serialVersionUID = 1;
private List <Point2D>playerAllCoordinatesList =new ArrayList<Point2D>();
private Point2D playerCurrentPosition, playerLastPosition;
private Rectangle2D playerStartPosition =new Rectangle2D.Double(100, 100, 20, 20);
privatefinalint ELLIPSE_WIDTH = 20;
privatefinalint ELLIPSE_HEIGHT = 20;
privatefinalint ELLIPSE_WH_OFFSET = 10;
private Line2D connectingLine;
public PlayerMgmt(){
addMouseListener(new MouseAdapter(){
publicvoid mouseClicked(MouseEvent evt){
if (SwingUtilities.isLeftMouseButton(evt)){
playerAllCoordinatesList.add(new Point2D.Double(evt.getX(), evt.getY()));
}
if (SwingUtilities.isRightMouseButton(evt)){
if (playerAllCoordinatesList.size() > 0) playerAllCoordinatesList.remove(playerAllCoordinatesList.size() - 1);
}
repaint();
}
});
}
protectedvoid paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (isOpaque()){
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, getWidth(), getHeight());
}
if (playerAllCoordinatesList.size() == 0){
playerAllCoordinatesList.add(new Point2D.Double(100.0, 100.0));
}
g2.setColor(Color.GREEN);
g2.draw(playerStartPosition);
g2.setColor(Color.BLACK);
for(int i=1 ; i < playerAllCoordinatesList.size(); i++){
playerCurrentPosition = playerAllCoordinatesList.get(i);
playerLastPosition = playerAllCoordinatesList.get(i-1);
connectingLine =new Line2D.Double(playerLastPosition.getX(), playerLastPosition.getY(), playerCurrentPosition.getX(), playerCurrentPosition.getY());
g2.draw(new Ellipse2D.Double(playerCurrentPosition.getX()-ELLIPSE_WH_OFFSET, playerCurrentPosition.getY()-ELLIPSE_WH_OFFSET, ELLIPSE_WIDTH, ELLIPSE_HEIGHT));
g2.draw(connectingLine);
}
}
publicvoid mouseDragged(MouseEvent arg0){
// TODO Auto-generated method stub
}
publicvoid mouseMoved(MouseEvent arg0){
// TODO Auto-generated method stub
}
}
My first problem is that I don't find a way how I can read the mouse coordinates in my class "Rulers". Do I later have to use threads to update the mouse position (and draw it) at every mouse move?
Thanks a lot!
