how to add mouseClicked to script

问题

I have floodfill algorithm and I want add to this mouseClicked, but I dont know how becouse I have many errors.

Here is my code. I want get the x,y possition from mouseClicked and give it to "floodFill(image,x,y, yellow);"

Can anyone help me? thanks

import java.awt.Point;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

class AnimationFiller
{
 // draw a black square with a pen width of 1 pixels
  static void drawSquare(BufferedImage image)
  {
    java.awt.Graphics2D gr=(java.awt.Graphics2D) image.getGraphics(); 

    gr.setColor(new java.awt.Color(0,0,0));  // black
    gr.setStroke(new java.awt.BasicStroke(1));  // set pen width to 1 pixel
    gr.drawRect(0, 0, 296, 264);  // (x,y,w,h);
  }
  // implements the flood fill algorithm
  public static void floodFill(BufferedImage image, int x,int y, int fillColor)
  {
    java.util.ArrayList<Point> examList=new java.util.ArrayList<>();

    int initialColor=image.getRGB(x,y);
    examList.add(new Point(x,y));

    while (examList.size()>0)
    {
      Point p = examList.remove(0);  // get and remove the first point in the list
      if (image.getRGB(p.x,p.y)==initialColor) 
      {
        x = p.x;  y = p.y;
        image.setRGB(x, y, fillColor);  // fill current pixel

        examList.add(new Point(x-1,y));        // check west neighbor
        examList.add(new Point(x+1,y));        // check east neighbor
        examList.add(new Point(x,y-1));        // check north neighbor
        examList.add(new Point(x,y+1));        // check south neighbor
      }
    }

  }

  public static int packRgb(int r,int g,int b)
  {
    return (r*256+g)*256+b;
  }

  static JLabel _imageLabel;
  public static void main(String[] args) throws Exception
  {
    // read bmp image from file
    final BufferedImage image = ImageIO.read(new File("picture.bmp"));

    drawSquare(image);
    final JLabel imageLabel = new JLabel();
    _imageLabel = imageLabel;  // make it global
    imageLabel.setIcon(new ImageIcon(image));


    javax.swing.JFrame window = new javax.swing.JFrame();
    window.setResizable(false);
    window.setTitle("Kolorowanka");
    window.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);

    window.add(imageLabel);

    window.pack();
    window.setVisible(true);

    // fill the image with yellow color
    final int yellow = packRgb(255,255,0);
    imageLabel.addMouseListener(new MouseListener() {
    @Override
    public void mouseReleased(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        floodFill(image, e.getX(), e.getY(), yellow);
        imageLabel.setIcon(new ImageIcon(image));
    }
});

  }
}

回答1:

You can add mouseClicked event in this way:

imageLabel.addMouseListener(new MouseListener() {
    @Override
    public void mouseReleased(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        floodFill(image, e.getX(), e.getY(), yellow);
    }
});

If you want use some fields from outside of the anonymous class you have to define it as final. For example:

final BufferedImage image = ...

And

final int yellow = packRgb(255, 255, 0);

Please, read about final field before writing next parts of your project. Example sources:

• Use final liberally
• What is final in Java? Final variable , Method and Class Example
• Thread-safety with the Java final keyword
• Java theory and practice: Is that your final answer?

回答2:

This is a implementation of a scanline flood fill algorithm which I wrote a couple of months ago.

boundaries is a stack, startX , startY are the cordinates of the starting point. pixels array contain the rgb value of all the pixels in the in the image. The array was obtained using PixelGrabber on the source image.

The use of all other variables are implied.

boundaries.push(new Point(startX,startY));
//Now we have the starting positions for coloring in the above and lower lines
//coloring is done in right directions only

while(!boundaries.isEmpty()) //Loop as many times till no starting positions are found
{
    //Now begin coloring
    Point pt=boundaries.pop();
    //This is the starting point for coloring towards right direction
    int x=pt.x;
    int y=pt.y;

    //First go as far left as possible until a different colored pixel is found
    while(x>=0)
    {
        if(pixels[y*WIDTH+x]!=pickPointPreviousColor) break;
        x--;
    }
    x++;

    //Now extend right
    while (x<=WIDTH)
    {
        if(pixels[y*WIDTH+x]==pickPointPreviousColor)
            pixels[y*WIDTH+x]=colorToFill;
        else
        {
            upperLineCountingStarted = false;
            lowerLineCountingStarted=false;
            break;
        }

        if(y>0 && upperLineCountingStarted==false && pixels[(y-1)*WIDTH+x]==pickPointPreviousColor)
        {
            boundaries.push(new Point(x,y-1));
            upperLineCountingStarted=true;
        }

        else if(y>0 && upperLineCountingStarted==true && pixels[(y-1)*WIDTH+x]!=pickPointPreviousColor)
            upperLineCountingStarted=false;

        if(y<HEIGHT && lowerLineCountingStarted==false && pixels[(y+1)*WIDTH+x]==pickPointPreviousColor)
        {
            boundaries.push(new Point(x,y+1));
            lowerLineCountingStarted=true;
        }
        else if(y<HEIGHT && lowerLineCountingStarted==true && pixels[(y+1)*WIDTH+x]!=pickPointPreviousColor)
            lowerLineCountingStarted=false;

        x++;
    }
}

来源：https://stackoverflow.com/questions/14672861/how-to-add-mouseclicked-to-script