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MouseDragged & MouseMoved does not work in Java applet

I am currently working on a map creation program for the game being created, and therefore I am trying to change individual fragments on the map with the mouse. I successfully implemented the ability to click on a tile and change its value (from a 4-dimensional tile to a 2-sided tile), but I had problems working with mouseDragged. According to the Java docs, I have implemented the correct implementation of the mouseDragged interface in my MouseEventHandler, but when I drag the mouse and move the mouse around none of these events, I drop the println text that I have, Now. If anyone could shed light on why this is not working for me, I would love it. Thanks!

Question: if someone has better methods for creating such a map, or any (presumably something better than what I did), other methods for detecting a single mouse. While on the tile, I would like to hear It. This is only my first time working with such things, so I am completely inexperienced and would like some advice.

As for the code itself:

File 1: OneQuestMapgen.java

package OneQuestMapgen; import java.awt.Graphics; import java.util.ArrayList; import javax.swing.*; import tiles.Tile; import tiles.TileSet; public class OneQuestMapgen extends JApplet{ /** * */ public static OneQuestMapgen instance; ArrayList<ArrayList<Tile>> map = new ArrayList<ArrayList<Tile>>(); TileSet tileSet = new TileSet(); public void init(){ this.setSize(950,600); } public void start(){ this.addMouseListener(new MouseEventListener(this)); int tileSize = tileSet.get("grasslands")[1].getHeight(); for (int i = 0; i < getHeight(); i += tileSize) { ArrayList<Tile> temp = new ArrayList<Tile>(); for (int j = 0; j < getWidth(); j += tileSize) { temp.add(new Tile(j, i, tileSize, tileSet.get("grasslands"))); } map.add(temp); } } public void paint(Graphics g){ for (int i = 0; i < map.size(); i++){ for(int j = 0; j < map.get(i).size(); j++){ map.get(i).get(j).render(g); } } } public void stop(){ } public void destroy(){ } public ArrayList<ArrayList<Tile>> getMap(){ return map; } }

File 2: MouseEventListener.java

 package OneQuestMapgen; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.util.ArrayList; import tiles.Tile; public class MouseEventListener implements MouseListener, MouseMotionListener { OneQuestMapgen instance; ArrayList<ArrayList<Tile>> map; public MouseEventListener(OneQuestMapgen instance) { this.instance = instance; } @Override public void mouseClicked(MouseEvent e) { System.out.println(e.getX() + " , " + e.getY()); map = instance.getMap(); for (int i = 0; i < map.size(); i++) { for (int j = 0; j < map.get(i).size(); j++) if (map.get(i).get(j).bounds(e)) { map.get(i).get(j).onClicked(instance.getGraphics()); } } } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mousePressed(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseDragged(MouseEvent arg0) { System.out.println("Mouse Dragged: " + arg0.getX() + " , " + arg0.getY()); } @Override public void mouseMoved(MouseEvent arg0) { // TODO Auto-generated method stub System.out.println("Mouse Moved: " + arg0.getX() + " , " + arg0.getY()); } }

File 3: Tile.java

 package tiles; import java.awt.Graphics; import java.awt.event.MouseEvent; import java.awt.image.BufferedImage; @SuppressWarnings("serial") public class Tile extends Square { BufferedImage[] tiles; int tileValue = 0; public Tile (int x, int y, int size, BufferedImage[] tileSet){ super(x,y,size); tiles = tileSet; } public void render(Graphics g) { g.drawImage(tiles[tileValue], getX(), getY(), getDimension(), getDimension(), null); } public void onClicked(Graphics g) { tileValue++; System.out.println(tileValue); g.drawImage(tiles[tileValue], getX(), getY(), getDimension(), getDimension(), null); } public boolean bounds(MouseEvent e){ if (e.getX() <= getX() + getDimension() && e.getX() >= getX() && e.getY() <= getY() + getDimension() && e.getY() >= getY()) return true; return false; } }

File 4: TileSet.java

 package tiles; import java.awt.image.BufferedImage; import java.net.URL; import java.util.concurrent.ConcurrentHashMap; import javax.imageio.ImageIO; public final class TileSet { ConcurrentHashMap<String, BufferedImage[]> container = new ConcurrentHashMap<String, BufferedImage[]>(11); BufferedImage[] grasslands = new BufferedImage[11]; public TileSet(){ boolean toAdd = true; try { grasslands[0] = ImageIO.read(new URL("http://i675.photobucket.com/albums/vv118/va023/OneQuest/GrassBlank_zpse99de845.png")); grasslands[1] = ImageIO.read(new URL("http://i675.photobucket.com/albums/vv118/va023/OneQuest/4WayTile_zps49ebbeea.png")); grasslands[2] = ImageIO.read(new URL("http://i675.photobucket.com/albums/vv118/va023/OneQuest/LineHorizontal_zpsc7bd45d5.png")); grasslands[3] = ImageIO.read(new URL("http://i675.photobucket.com/albums/vv118/va023/OneQuest/LineVertical_zps9719b63f.png")); grasslands[4] = ImageIO.read(new URL("http://i675.photobucket.com/albums/vv118/va023/OneQuest/TShapeTop_zpsa4b2aaa1.png")) } catch (Exception e) { System.out.println("Unable to load resources for Grasslands"); } for (int i = 0; i < grasslands.length; i++) if (grasslands[i].getWidth() != grasslands[i].getHeight()) { System.out.println("Error, tiles are not square. Grasslands has not been added."); toAdd = false; } if (toAdd) { container.put("grasslands".toLowerCase(), grasslands); } } public BufferedImage[] get(String s) { return container.get(s.toLowerCase()); } }

File 5: Square.java

 package tiles; import javax.swing.JLabel; public abstract class Square extends JLabel{ /** * */ private static final long serialVersionUID = 1L; private int x; private int y; private int dimension; public Square(int x, int y, int dimension){ this.x = x; this.y = y; this.dimension = dimension; } public int getX(){ return x; } public int getY(){ return y; } public int getDimension(){ return dimension; } }

Note. If you want to pull everything from github, I added a link to my github repository for this project below:

URL: https://github.com/vagrawal1/OneQuestMapgen

HTTPS: https://github.com/vagrawal1/OneQuestMapgen.git

SSH: git @ github.com: vagrawal1 / OneQuestMapgen.git

Git Read only: git: //github.com/vagrawal1/OneQuestMapgen.git

Thanks again for your help and thank you for taking the time to read this.

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1 answer

You need to add a MouseMotionListener to drag and drop to work. You just add a MouseListener.

i.e.,

 public void start() { MouseEventListener myMouseEventListener = new MouseEventListener(this); addMouseListener(myMouseEventListener); addMouseMotionListener(myMouseEventListener); //this.addMouseListener(new MouseEventListener(this));

Also, according to my comments, the getX () and getY () methods of the Square class override the same JLabel methods, and if you are not careful with them and use them correctly, they can completely ruin the placement of your components in the GUI. I myself make great efforts to avoid overriding these methods. Consider changing your names if redefinition was not your intention.

In addition, I prefer mousePressed(...) according to the mouseClicked(...) method, since the former will respond to the press even if you click the mouse.

Edit: another mistake! You almost never have to get your Graphics instance by calling getGraphics() on the component, since the returned Graphics object disappears and may soon become null. Instead, either draw a BufferedImage that displays in the JComponent or JPanel paintComponent(...) , or simply draw paintComponent(...) .

Edit 2: why redefine paint(...) ? This seems a little dangerous to me, especially since you do not call the super method, and especially since there is no need to do such things.

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Source: https://habr.com/ru/post/1484544/

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