在2d阵列网格中绘制JLabel之间的线
我正在尝试在JLabel但未能获得坐标的单元格之间绘制线条。 这些行必须遵循从startPoint到endPoint的路径。
在我的View类中，下面的代码创建了网格：
void createGrid(int rows, int cols) {
MyMouseListener listener = new MyMouseListener();
setRows(rows);
mainPanel.setLayout(new GridLayout(rows, cols, 1, 1));
mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
mainPanel.setBackground(Color.DARK_GRAY);
grid = new JLabel[rows][cols];
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JLabel(iconMap.get(Token.VIDE));
grid[r][c].addMouseListener(listener);
grid[r][c].setOpaque(true);
grid[r][c].setBackground(Color.WHITE);
//grid[r][c].setPreferredSize(new Dimension(ICON_W, ICON_W));
mainPanel.add(grid[r][c]);
}
}
}
虽然这个创建了图标：
private Icon createIcon(Color color) {
BufferedImage img = new BufferedImage(ICON_W, ICON_W, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(color);
g2.fillOval(1, 1, ICON_W - 2, ICON_W - 2); // int ICON_W = 20;
g2.dispose();
return new ImageIcon(img);
}
View类的完整代码：https://pastebin.com/sgyn6rSR 路径算法代码：https://pastebin.com/Gcw9YVMF
我尝试了类似下面的内容，但无效
Graphics2D g2d = (Graphics2D) g.create();
for (JLabel[] grid : cells) {
g2d.setColor(Color.BLUE);
Point startPoint = grid[0].getLocation();
Point endPoint = grid[1].getLocation();
startPoint.x += (grid[0].getWidth() / 2);
startPoint.y += (grid[1].getHeight()/ 2);
endPoint.x += (grid[0].getWidth() / 2);
endPoint.y += (grid[1].getHeight()/ 2);
if(startPoint != null){
g2d.draw(new Line2D.Double(startPoint, endPoint));
}
startPoint = endPoint;
}
4 个答案:
答案 0 :(得分：2)
覆盖您添加标签的面板的paintComponent()方法。
基本代码是：
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
for (int i = 0; i < getComponentCount() - 1; i++)
{
Component component1 = getComponent(i);
Point point1 = component1.getLocation();
Component component2 = getComponent(i + 1);
Point point2 = component2.getLocation();
g.drawLine(point1.x, point1.y, point2.x, point2.y);
}
}
一旦你完成这项工作，你可以修改逻辑，从每个组件的从/到中心绘制线。
答案 1 :(得分：1)
花了很长时间。抱歉，我原始问题有很多背景信息，包括基本View和Path代码：P
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeListener;
import java.util.ArrayList;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import java.util.StringJoiner;
import javax.swing.BorderFactory;
import javax.swing.DebugGraphics;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class View extends JPanel {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
DrawLines drawLines = new DrawLines();
JFrame frame = new JFrame();
frame.setGlassPane(drawLines);
frame.add(new View(20, 20, drawLines));
frame.getGlassPane().setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
enum Token {
VIDE, CERCLE_BLEU, CERCLE_ROUGE
}
private static final int ICON_W = 20;
public static final String CELL_SELECTION = "cell selection";
private int rows;
private Token[][] tokens;
private JLabel[][] grid;
private Map<Token, Icon> iconMap = new EnumMap<>(Token.class);
private int selectedRow;
private int selectedCol;
//a collection of cells representing a path
private ArrayList<Cell> path;
private DrawLines drawLines;
View(int rows, int cols, DrawLines drawLines) {
this.drawLines = drawLines;
iconMap.put(Token.VIDE, createIcon(new Color(0, 0, 0, 0)));
iconMap.put(Token.CERCLE_BLEU, createIcon(Color.BLUE));
iconMap.put(Token.CERCLE_ROUGE, createIcon(Color.RED));
createGrid(rows, cols);
}
private Icon createIcon(Color color) {
BufferedImage img = new BufferedImage(ICON_W, ICON_W, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(color);
g2.fillOval(1, 1, ICON_W - 2, ICON_W - 2);
g2.dispose();
return new ImageIcon(img);
}
void createGrid(int rows, int cols) {
tokens = new Token[rows][cols];
MyMouseListener listener = new MyMouseListener();
setRows(rows);
setLayout(new GridLayout(rows, cols, 1, 1));
setBorder(BorderFactory.createLineBorder(Color.BLACK));
setBackground(Color.DARK_GRAY);
grid = new JLabel[rows][cols];
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JLabel(iconMap.get(Token.VIDE));
grid[r][c].addMouseListener(listener);
grid[r][c].setOpaque(true);
grid[r][c].setBackground(Color.WHITE);
grid[r][c].setPreferredSize(new Dimension(ICON_W, ICON_W));
add(grid[r][c]);
}
}
set(6, 6, Token.CERCLE_ROUGE);
set(6, 7, Token.CERCLE_ROUGE);
set(6, 8, Token.CERCLE_ROUGE);
set(6, 9, Token.CERCLE_ROUGE);
set(7, 9, Token.CERCLE_ROUGE);
set(8, 9, Token.CERCLE_ROUGE);
set(9, 9, Token.CERCLE_ROUGE);
set(10, 9, Token.CERCLE_ROUGE);
set(10, 6, Token.CERCLE_ROUGE);
set(10, 7, Token.CERCLE_ROUGE);
set(10, 8, Token.CERCLE_ROUGE);
set(10, 9, Token.CERCLE_ROUGE);
set(7, 6, Token.CERCLE_ROUGE);
set(8, 6, Token.CERCLE_ROUGE);
set(9, 6, Token.CERCLE_ROUGE);
//
// set(7, 6, Token.CERCLE_ROUGE);
// set(7, 7, Token.CERCLE_BLEU);
// set(7, 8, Token.CERCLE_BLEU);
//
// set(8, 6, Token.CERCLE_ROUGE);
// set(8, 7, Token.CERCLE_ROUGE);
// set(8, 8, Token.CERCLE_ROUGE);
//
// set(5, 7, Token.CERCLE_ROUGE);
// set(5, 8, Token.CERCLE_ROUGE);
// set(5, 9, Token.CERCLE_ROUGE);
// set(6, 9, Token.CERCLE_ROUGE);
// set(7, 9, Token.CERCLE_ROUGE);
Path path = new Path(tokens);
if (path.findPath(new int[]{6, 6})) {
setPath(path.getPath());
}
}
void set(int row, int col, Token token) {
grid[row][col].setIcon(iconMap.get(token));
tokens[row][col] = token;
}
int getSelectedRow() {
return selectedRow;
}
int getSelectedCol() {
return selectedCol;
}
void setCell(Token token, int row, int col) {
grid[row][col].setIcon(iconMap.get(token));
}
int getRows() {
return rows;
}
void setRows(int rows) {
this.rows = rows;
}
//added to each cell to listen to mouse clicks
//fires property change with cell index
private class MyMouseListener extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
JLabel selection = (JLabel) e.getSource();
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
if (selection == grid[r][c]) {
selectedRow = r;
selectedCol = c;
int index = (r * grid[r].length) + c;
selection.setIcon(iconMap.get(Token.CERCLE_BLEU));
tokens[selectedRow][selectedCol] = Token.CERCLE_BLEU;
System.out.println(c + "x" + r + " = " + index);
firePropertyChange(CELL_SELECTION, -1, index);
Path path = new Path(tokens);
if (path.findPath(new int[]{selectedRow, selectedCol})) {
setPath(path.getPath());
}
}
}
}
}
}
//add listener to listen to property changes fired by MyMouseListener
public void addPropertyChangeListener(PropertyChangeListener viewListener) {
addPropertyChangeListener(viewListener);
}
void setPath(ArrayList<Cell> path) {
this.path = path;
if (path != null) {
drawPath();
}
}
//highlight path by changing background color.
//It can be changed to draw lines between cells
private void drawPath() {
if (path != null) {
List<JLabel> labels = new ArrayList<>(25);
for (Cell cell : path) {
JLabel label = grid[cell.y][cell.x];
label.setBackground(Color.YELLOW);
labels.add(label);
}
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
if (!path.contains(new Cell(c, r))) {
grid[r][c].setBackground(Color.WHITE);
}
}
}
drawLines.setPath(labels);
}
}
void refresh() {
repaint();
}
//This is what I added to try drawing lines
public static class DrawLines extends JLabel {
List<JLabel> path;
public void setPath(List<JLabel> path) {
this.path = new ArrayList<>(path);
this.path.add(path.get(0));
repaint();
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (path != null) {
Graphics2D g2d = (Graphics2D) g.create();
Point startPoint = null;
for (JLabel label : path) {
g2d.setColor(Color.DARK_GRAY);
Point endPoint = label.getLocation();
endPoint.x += (label.getWidth() / 2);
endPoint.y += (label.getHeight() / 2);
if (startPoint != null) {
g2d.draw(new Line2D.Float(startPoint, endPoint));
}
startPoint = endPoint;
}
g2d.dispose();
}
}
}
class Cell {
private int x, y;
public Cell(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
@Override
public int hashCode() {
int hash = 7;
return hash;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Cell other = (Cell) obj;
if (this.x != other.x) {
return false;
}
if (this.y != other.y) {
return false;
}
return true;
}
@Override
public String toString() {
return x + "x" + y;
}
}
class Path extends Stack<Cell> {
private Token[][] grid;
//a path shorter than min can not surround any cell
private static final int MIN_PATH_LEGTH = 3;
//a collection of cells that has been tested
private ArrayList<Cell> checked;
//represents the cell where the search starts from
Cell origin;
//represents the token of the origin
Token originToken;
private int rows;
private int cols;
Path(Token[][] grid) {
this.grid = grid;
rows = grid.length;
cols = grid[0].length;
}
//search for a path
boolean findPath(int[] origin) {
int row = origin[0], col = origin[1];
this.origin = new Cell(col, row);
//represents the token of the origin
originToken = grid[row][col];
//initialize list of checked items
checked = new ArrayList<>();
boolean found = findPath(row, col);
if (found) {
printPath();
} else {
System.out.println("No path found");
}
return found;
}
//recursive method to find path. a cell is represented by its row, col
//returns true when path was found
private boolean findPath(int row, int col) {
//check if cell has the same token as origin
if (grid[row][col] != originToken) {
return false;
}
Cell cell = new Cell(col, row);
//check if this cell was tested before to avoid checking again
if (checked.contains(cell)) {
return false;
}
//get cells neighbors
ArrayList<Cell> neighbors = getNeighbors(row, col);
//check if solution found. If path size > min and cell
//neighbors contain the origin it means that path was found
if ((size() >= MIN_PATH_LEGTH) && neighbors.contains(origin)) {
add(cell);
return true;
}
//add cell to checked list
checked.add(cell);
//add cell to path
add(cell);
//if path was not found check cell neighbors
for (Cell neighbor : neighbors) {
boolean found = findPath(neighbor.getY(), neighbor.getX());
if (found) {
return true;
}
}
//path not found
pop(); //remove last element from stack
return false;
}
//return a list of all neighbors of cell row, col
private ArrayList<Cell> getNeighbors(int row, int col) {
ArrayList<Cell> neighbors = new ArrayList<Cell>();
for (int colNum = col - 1; colNum <= (col + 1); colNum += 1) {
for (int rowNum = row - 1; rowNum <= (row + 1); rowNum += 1) {
if (!((colNum == col) && (rowNum == row))) {
if (withinGrid(rowNum, colNum)) {
neighbors.add(new Cell(colNum, rowNum));
}
}
}
}
return neighbors;
}
private boolean withinGrid(int colNum, int rowNum) {
if ((colNum < 0) || (rowNum < 0)) {
return false;
}
if ((colNum >= cols) || (rowNum >= rows)) {
return false;
}
return true;
}
//use for testing
private void printPath() {
StringJoiner sj = new StringJoiner(",", "Path: ", "");
for (Cell cell : this) {
sj.add(cell.toString());
}
System.out.println(sj);
}
public ArrayList<Cell> getPath() {
ArrayList<Cell> cl = new ArrayList<>();
cl.addAll(this);
return cl;
}
}
}
但这些线条并没有重新粉刷。有没有办法拯救他们？
DrawLines将绘制您传递的路径。要提供“历史记录”，您需要维护所有路径中的List个，例如......
public static class DrawLines extends JLabel {
private List<List<JLabel>> history;
public DrawLines() {
history = new ArrayList<>(25);
}
public void setPath(List<JLabel> path) {
List<JLabel> copy = new ArrayList<>(path);
copy.add(path.get(0));
history.add(copy);
repaint();
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Point startPoint = null;
for (List<JLabel> path : history) {
for (JLabel label : path) {
g2d.setColor(Color.DARK_GRAY);
Point endPoint = label.getLocation();
endPoint.x += (label.getWidth() / 2);
endPoint.y += (label.getHeight() / 2);
if (startPoint != null) {
g2d.draw(new Line2D.Float(startPoint, endPoint));
}
startPoint = endPoint;
}
}
g2d.dispose();
}
}
答案 2 :(得分：1)
这是修改的View类，用于按要求添加行。
请查看并查看评论：
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeListener;
import java.util.EnumMap;
import java.util.Map;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class View {
public static final String CELL_SELECTION = "cell selection";
private final static int GAP = 2;
private static int iconWidth;
private int rows;
private JPanel mainPanel;
private JLabel[][] grid;
private Map<Token, Icon> iconMap = new EnumMap<>(Token.class);
private int selectedRow;
private int selectedCol;
//a collection of cells representing a path
private CellsList path;
//a pane to hold two panels one on top of the other
JPanel layeredPanel;
View() {
mainPanel = new JPanel();
//add layerd pane to hold two panels one on top of the other
layeredPanel = new JPanel();
//set GridBagLayout to allow placing two components one on top of the other
layeredPanel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
//add main panel to layered panel
layeredPanel.add(mainPanel, gbc);
//create and add a drawing panel
DrawJPanel drawPanel = new DrawJPanel();
drawPanel.setOpaque(false); //set if to transparent so it does not
//hide mainPanel under it
layeredPanel.add(drawPanel, gbc);
//set z-order (depth) of two panels
layeredPanel.setComponentZOrder(mainPanel,1);
layeredPanel.setComponentZOrder(drawPanel,0);
}
void createGrid(int rows, int cols) {
MyMouseListener listener = new MyMouseListener();
setRows(rows);
setIcons();
mainPanel.setLayout(new GridLayout(rows, cols, 1, 1));
mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
mainPanel.setBackground(Color.BLACK);
grid = new JLabel[rows][cols];
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JLabel(iconMap.get(Token.VIDE));
grid[r][c].addMouseListener(listener);
grid[r][c].setOpaque(true);
grid[r][c].setBackground(Color.WHITE);
mainPanel.add(grid[r][c]);
}
}
layeredPanel.setPreferredSize(mainPanel.getPreferredSize());
}
int getSelectedRow() {
return selectedRow;
}
int getSelectedCol() {
return selectedCol;
}
void setCell(Token token, int row, int col) {
grid[row][col].setIcon(iconMap.get(token));
}
int getRows() {
return rows;
}
void setRows(int rows) {
this.rows = rows;
}
//added to each cell to listen to mouse clicks
//fires property change with cell index
private class MyMouseListener extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
JLabel selection = (JLabel) e.getSource();
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
if (selection == grid[r][c]) {
selectedRow = r;
selectedCol = c;
int index = (r * grid[r].length) + c;
mainPanel.firePropertyChange(CELL_SELECTION, -1, index);
}
}
}
}
}
void start() {
JFrame frame = new JFrame("MVC Pha");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(layeredPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
//add listener to listen to property changes fired by MyMouseListener
void addPropertyChangeListener(PropertyChangeListener viewListener) {
mainPanel.addPropertyChangeListener(viewListener);
}
void setPath(CellsList path) {
this.path = path;
if(path != null) {
drawPath();
}
}
//highlight path by changing background color.
//It can be changed to draw lines between cells
private void drawPath() {
for (int row = 0; row < grid.length; row++) {
for (int col = 0; col < grid[row].length; col++) {
if((path != null) && path.contains(new int[] {row,col})) {
grid[row][col].setBackground(Color.YELLOW);
} else {
grid[row][col].setBackground(Color.WHITE);
}
}
}
}
//receives rectangle and returns its center point
private Point getComponentCenter(Rectangle bounds) {
int xCenter = (int) ((bounds.getX()+ bounds.getMaxX())/2);
int yCenter = (int) ((bounds.getMinY()+ bounds.getMaxY())/2);
return new Point(xCenter, yCenter);
}
void refresh() {
layeredPanel.repaint();
}
private void setIcons() {
if(rows <= 20) {
iconWidth = 24;
} else if( rows <= 40 ) {
iconWidth = 20;
} else if( rows <= 60 ) {
iconWidth = 15;
} else if( rows <= 80 ) {
iconWidth = 12;
} else {
iconWidth = 8;
}
iconMap.put(Token.VIDE, createIcon(new Color(0, 0, 0, 0)));
iconMap.put(Token.CERCLE_BLEU, createIcon(Color.BLUE));
iconMap.put(Token.CERCLE_ROUGE, createIcon(Color.RED));
}
private Icon createIcon(Color color) {
BufferedImage img = new BufferedImage(iconWidth, iconWidth, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(color);
g2.fillOval(1, 1, iconWidth - GAP, iconWidth - GAP);
g2.dispose();
return new ImageIcon(img);
}
//a panel to draw line on
class DrawJPanel extends JPanel {
@Override
protected void paintComponent(Graphics g){
super.paintComponent(g);
if((path == null) || path.isEmpty() ) {
return;
}
//calculate points to construct line along the path
Point[] polygon = new Point[path.size()];
int i=0;
for(int[] address : path) { //iterate over path
//get cell location (row / col)
int row = address[0]; int col = address[1];
//get label in that location
JLabel lable = grid[row][col];
//add center of label as a point in polygon
polygon[i++] = getComponentCenter(lable.getBounds());
}
//draw points in polygon
g.setColor(Color.CYAN); //set line color and width
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(2));
int j;
for (j = 0; j < (polygon.length -1); j++) {
Point point1 = polygon[j];
Point point2 = polygon[j+1];
g2.draw(new Line2D.Float(point1, point2));
}
//add line to connect last point to first
g2.draw(new Line2D.Float(polygon[j], polygon[0]));
}
}
}
答案 3 :(得分：1)
以下答案提供与我之前的answer相同的解决方案。
为了所有人（其他用户，那些试图回答的人以及海报）的利益，我认为这个问题应该被问到并以mcve作为答案：
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class View {
private static final String WHITE = "white";
private static final String BLUE = "blue";
private final static int GAP = 2;
private static final int iconWidth = 24;
private Map<String, Icon> iconMap = new HashMap<>();
private JPanel mainPanel;
private JLabel[][] grid;
//a collection of cells representing a path
private ArrayList<int[]> path;
//a pane to hold two panels one on top of the other
JPanel layeredPanel;
View(int rows) {
JFrame frame = new JFrame("Line between JLabels");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainPanel = new JPanel();
//add layered pane to hold two panels one on top of the other
layeredPanel = new JPanel();
//set GridBagLayout to allow placing two components one on top of the other
layeredPanel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
//add main panel to layered panel
layeredPanel.add(mainPanel, gbc);
//create and add a drawing panel
DrawJPanel drawPanel = new DrawJPanel();
drawPanel.setOpaque(false); //set if to transparent so it does not
//hide mainPanel under it
layeredPanel.add(drawPanel, gbc);
//set z-order (depth) of two panels
layeredPanel.setComponentZOrder(mainPanel,1);
layeredPanel.setComponentZOrder(drawPanel,0);
path = new ArrayList<>();
setTestData();
createGrid(rows,rows);
frame.getContentPane().add(layeredPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
void createGrid(int rows, int cols) {
setIcons();
mainPanel.setLayout(new GridLayout(rows, cols, 1, 1));
mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
mainPanel.setBackground(Color.BLACK);
grid = new JLabel[rows][cols];
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
if(isInPath(new int[] {r,c})) {
grid[r][c] = new JLabel(iconMap.get(BLUE));
} else {
grid[r][c] = new JLabel(iconMap.get(WHITE));
}
grid[r][c].setOpaque(true);
grid[r][c].setBackground(Color.WHITE);
mainPanel.add(grid[r][c]);
}
}
layeredPanel.setPreferredSize(mainPanel.getPreferredSize());
}
//receives rectangle and returns its center point
private Point getComponentCenter(Rectangle bounds) {
int xCenter = (int) ((bounds.getX()+ bounds.getMaxX())/2);
int yCenter = (int) ((bounds.getMinY()+ bounds.getMaxY())/2);
return new Point(xCenter, yCenter);
}
private void setIcons() {
iconMap.put(WHITE, createIcon(new Color(0, 0, 0, 0)));
iconMap.put(BLUE, createIcon(Color.BLUE));
}
private Icon createIcon(Color color) {
BufferedImage img = new BufferedImage(iconWidth, iconWidth, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(color);
g2.fillOval(1, 1, iconWidth - GAP, iconWidth - GAP);
g2.dispose();
return new ImageIcon(img);
}
private boolean isInPath(int[] cell) {
if((path == null) || path.isEmpty() ) {
return false;
}
for(int[] p : path) {
if((cell[0]== p[0]) && (cell[1] == p[1])) {
return true;
}
}
return false;
}
//a panel to draw line on
class DrawJPanel extends JPanel {
@Override
protected void paintComponent(Graphics g){
super.paintComponent(g);
if((path == null) || path.isEmpty() ) {
return;
}
//calculate points to construct line along the path
Point[] polygon = new Point[path.size()];
int i=0;
for(int[] address : path) { //iterate over path
//get cell location (row / col)
int row = address[0]; int col = address[1];
//get label in that location
JLabel lable = grid[row][col];
//add center of label as a point in polygon
polygon[i++] = getComponentCenter(lable.getBounds());
}
//draw points in polygon
g.setColor(Color.CYAN); //set line color and width
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(2));
int j;
for (j = 0; j < (polygon.length -1); j++) {
Point point1 = polygon[j];
Point point2 = polygon[j+1];
g2.draw(new Line2D.Float(point1, point2));
}
//add line to connect last point to first
g2.draw(new Line2D.Float(polygon[j], polygon[0]));
}
}
public static void main(String[] args) {
new View(10);
}
private void setTestData() {
path.add(new int[] {3,3});
path.add(new int[] {3,4});
path.add(new int[] {3,5});
path.add(new int[] {4,6});
path.add(new int[] {5,5});
path.add(new int[] {5,4});
path.add(new int[] {5,3});
path.add(new int[] {4,4});
}
}
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