[RESOLVED]Java draw circles on image

[jlbovo]

hello, i found the answer to my last post finally. now i have a new task to implement. I need to draw a circle or oval when a point on an image is clicked. For instance if you were to click on the eye of a person in a image in a jpanel, i need to draw a red circle of where i just clicked. i am researdhing and figured out this, and i can post more of my code when i have more time, for i am pressed right now...


some thing laong the lines of...

        setColor(red);
	fillCircle(newX,newY, 20);

my only question now si what does the 20 mean ?

remind you i am very new to java, but i will sit down later with my manual to try to implement. I'm sure it would be more helpful if i posted my code, but If anyone knows of what along the lines I am trying to do you willingness to help would be appercaited thanks. justin

[ComputerJy]

I'm almost sure you didn't write any of the code, because if you did. You'd know that fillCircle is not Java built-in method. And since you are not calling it from any other object then I'd take a wild guess and say the body of the method is in your class so take another look and tell us what does it look like!!

[jlbovo]

i know, it not mine at all, i was just running thru a manual trying to get an idea of what i'm going for, just so other know. here's my code....

private class mouseImgEventHandler implements MouseListener, MouseMotionListener {

      //empty body of methods.
      public void mousePressed(MouseEvent e) {}
      public void mouseReleased(MouseEvent e) {}
      public void mouseEntered(MouseEvent e) {}
      public void mouseExited(MouseEvent e) {}
      public void mouseMoved(MouseEvent e) {}
      public void mouseDragged(MouseEvent e) {}

      //get X-Y location when mouse is clicked.
      public void mouseClicked(MouseEvent e) {
         int currentX = e.getX();
         int currentY = e.getY();

         //display X-Y on the message board.
         if(panelID == 1)
            parent.leftDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
         if(panelID == 2)
            parent.rightDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
         if(panelID == 3)
            parent.resultDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
         //repaint();
      }
   }

i just put that up the as an example of what i am tryign to do.

based on the x/y coordinates i get when i click the mouse, I want to draw circles..

 public void paintComponent(Graphics graphics) {
       Graphics2D g = (Graphics2D)graphics.create();
       // eyes
       g.setColor(Color.red);
       g.fillOval(30, 30, 8, 8);
       g.fillOval(62, 30, 8, 8);

.but how do i pass the mouse coordnates to the drawing of the oval ?

     if(panelID == 1)
            parent.leftDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
       // eyes
       g.setColor(Color.red);
       g.fillOval(30, 30, 8, 8);
       g.fillOval(62, 30, 8, 8);

and where would i incldue a line like this

public void paintComponent(Graphics graphics) {
       Graphics2D g = (Graphics2D)graphics.create();

...at the begginign of my mouse handler, or some where else ?



does that clear my idea more, i thanks you again for stopping to help. justin

[ComputerJy]

but how do i pass the mouse coordnates to the drawing of the oval ?

Are you serious??

         int currentX = e.getX();
         int currentY = e.getY();

and where would i incldue a line like this

Anywhere you want, just make sure you declare the object before you start using it
And BTW it's

Graphics2D g = (Graphics2D)graphics;

[jlbovo]

i'm sorry so sorry, like i say i am a begginer. No formal learning/training in this.

so....

       if(panelID == 1)
       parent.leftDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
       // eyes
       g.setColor(Color.red);
       g.fillOval(currentX, currentY, 8, 8);

i think thats what i'm going for, will that draw a small oval on the spot that i click ??
thanks again - justin

[jlbovo]

here's my code

// mouse event handler, as an inner class of ImagePanel class.
   // 
   private class mouseImgEventHandler implements MouseListener, MouseMotionListener {

      //empty body of methods.
      public void mousePressed(MouseEvent e) {}
      public void mouseReleased(MouseEvent e) {}
      public void mouseEntered(MouseEvent e) {}
      public void mouseExited(MouseEvent e) {}
      public void mouseMoved(MouseEvent e) {}
      public void mouseDragged(MouseEvent e) {}

      //get X-Y location when mouse is clicked.
      public void mouseClicked(MouseEvent e) {
         int currentX = e.getX();
         int currentY = e.getY();
	Graphics2D g = (Graphics2D)graphics;

         //display X-Y on the message board.
         if(panelID == 1)
            parent.leftDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
		// eyes
       		g.setColor(Color.red);
       		g.fillOval(currentX, currentY, 8, 8);
         if(panelID == 2)
            parent.rightDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
         if(panelID == 3)
            parent.resultDisplay.setText("X:  " + currentX + ",   Y:  " + currentY);
         //repaint();
      }
   }

here's my errors...

UIDDemo1.java:349: cannot find symbol
symbol : variable graphics
location: class ImagePanel.mouseImgEventHandler
Graphics2D g = (Graphics2D)graphics;
^
1 error

.....i will continue working on this code and i'm on my way to work. i thanks you for all your time and effort !!! justin

[ComputerJy]

replace

Graphics2D g = (Graphics2D)graphics;

with

Graphics2D g = (Graphics2D)this.getGraphics();

[jlbovo]

thaks again but i keep gettin an error...

UIDDemo1.java:350: cannot find symbol
symbol  : method getGraphics()
location: class ImagePanel.mouseImgEventHandler
        Graphics2D g = (Graphics2D)this.getGraphics();
                                   ^
1 error

..do i need to import something at the begging of the file so i can call Graphics ? -justin

[ComputerJy]

Does your class extend "JFrame, JPanel, Panel, Applet or ...etc"? This method "getGraphics" is inherited from the component class

[jlbovo]

it's a class that uses jpanel..

class ImagePanel extends JPanel {

[ComputerJy]

remove the "this", just use the "getGraphics();"

[jlbovo]

awesome dude, thansk for all your help man. it works, it draws the circles !! i am so thanksful, I have learned alot from you over this. Thanks again for helping...I'm sure i'll have more questions, but now this topics is resolved. if i need more info i'll be sure to ask again ! - justin