Wrong Mouse Positions

[Steven Joost]

Hello guys, I need help, because another problem appeared:

If I move the JFrame I'm drawing in, the MousePositions are moving weirdly in the direction, i'm moving the jframe

how can I get the positions Correct, even if I move the JFrame?

[Tony Docherty]

Sorry but your question makes no sense to me. You say another problem has appeared, does this mean this relates to an earlier post you have made? if so can you provide a link to the other thread.
Also can you show some code that demonstrates the problem you are describing along with instructions on how to make the issue appear.

[Steve Luke]

Well, of course we know what you are doing, what mouse listener code you have, how you move the JFrame and what you mean by drawing. Oh, and we also know what behaving weirdly means.

I jest of course. We have no idea how to fix your issue because you don't show us anything. Be could make a guess but 99.99% chance that the guess would be unrelated to your code.

Why don't you write a small SSCCE (<-click) which shows the problem you are having and explain what is actually behaving incorrectly (i.e. what you expect to happen and the difference between that and what is happening).

[Randall Twede]

i agree. not enough information.

however, you don't draw in a JFrame

[Steven Joost]

package ingame;

import java.awt.AWTException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.PrintStream;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;



  public class Main extends JPanel
  {


  int X = 200; int Y = 200;
  boolean links = false;
  boolean oben = false;
  int BarY = 800;
  int BarY2;
  int BarX = 20;
  int fx=500;
  int fy=500;
  boolean clicked,pause;
int q,w;



    Image splash;
    Dimension size;

    public Main()
    {
    	addMouseListener(new aaa());
    	this.size = new Dimension();
      this.splash = new ImageIcon(getClass().getResource("tree5.png")).getImage();
      this.size.width = 50;
      this.size.height = 50;
      setPreferredSize(this.size);
    }
@Override
    public void paint(Graphics x) {
	super.paint(x);
      for (int i = 0; i < 1; i++) {
    	  

	x.setColor(new Color(0,0,255,10));
	x.fillRect(0,0,1000,1000);
	

    	  
    	  
        x.drawImage(this.splash, X, Y, null);
        x.setColor(new Color(0, 122, 250));
if(clicked){
    	PointerInfo a = MouseInfo.getPointerInfo();
    	Point b = a.getLocation();
    	int MX = (int) b.getX();
    	int MY = (int) b.getY();

q = MX-9/100;w=MY-30;
}
        if ((X != fx - 100) && (!links)) { X += 1; 
        } else if ((X == fx - 100) && (!links)) { links = true; }
        if (links) { X -= 1;}
        if ((X == 1) && (links)) {X += 1;links = false;
        }
        if ((Y != fy - 201) && (!oben)) {Y += 1; repaint();
        } else if ((this.Y == fy - 201) && (!oben)) { oben = true; }
        if (oben) { Y -= 1;}
        if ((Y == 1) && (oben)) { Y += 1; oben = false; }
        x.fillRect(q,w,50,50);
        try
        {
          Thread.sleep(10L); } catch (Exception ex) { ex.printStackTrace(); }
        repaint();
      }
    }
  

  public class aaa implements MouseListener
  {
    public aaa()
    {
    }

    public void mouseEntered(MouseEvent arg0)
    {
    }

    public void mouseExited(MouseEvent arg0) {
    }
@Override
    public void mousePressed(MouseEvent e) {
	clicked = true;
	//if ((MX >X - 9) && (MX <X - 9 + 100) && (MY > Y + 30) && (MY < Y + 30 + 100)) { System.out.println("ULL");BarY -= 25;}
      
      
    }

    public void mouseReleased(MouseEvent arg0)
    {
    	clicked = false;
    }

    public void mouseClicked(MouseEvent e)
    {
    }
  }
  

  
  }

own defined:

package ingame;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;

public class Display extends JFrame{

	public Display() {
		setSize(600,600);
		setVisible(true);
		add(new Main());
		setDefaultCloseOperation(3);
		
	}


	public static void main(String[] args) {
		new Display();
	}

}

You have to resize the frame once.
In the beginning, the blue square is on my cursor, but if I move the JFrame it's drawn anywhere.

[Steven Joost]

if i remove the /100 at the q variable in the paint method, i dont work either

[Randall Twede]

for one thing, in a JPanel, you do not overide paint(),rather you override paintComponent()

and call super.paintComponent() instead of super.paint()

[Tony Docherty]

The problem is MouseInfo.getPointerInfo(); returns the mouse position relative to the top left of the screen whereas the graphics drawing methods draw relative to the top left of the component you are drawing in. You need to subtract the location of the component from the mouse position to get the correct relative value.

[Darryl Burke]

You need to subtract the location of the component from the mouse position to get the correct relative value.

Or better still, use the information that can be gleaned from the MouseEvent.

[Steven Joost]

Tony Docherty wrote:The problem is MouseInfo.getPointerInfo(); returns the mouse position relative to the top left of the screen whereas the graphics drawing methods draw relative to the top left of the component you are drawing in. You need to subtract the location of the component from the mouse position to get the correct relative value.

And how Im doing this?

[Darryl Burke]

Have you read the API for MouseEvent? There are two methods that return a Point. One of those is what you need.