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=={{header|Java}}==
{{works with|Java|8}}
<lang java>import java.awt.*;
import static java.awt.BasicStroke.*;
import java.awt.event.*;
import static java.lang.Math.abs;
import static java.lang.String.format;
import java.util.Random;
import javax.swing.*;
See [[Robots/Java]].
public class Robots extends JPanel {
enum Grid {
Player("@"), Robot("+"), Scrap("*"), Mark("~");
Grid(String s) {
symbol = s;
}
final String symbol;
}
final static int[][] dirs = {{-1, 1}, {0, 1}, {1, 1}, {-1, 0}, {1, 0},
{-1, -1}, {0, -1}, {1, -1}};
final static Random rand = new Random();
final int nRows;
final int nCols;
Grid[][] grid;
int playerRow, playerCol, score, hiScore, level;
boolean gameOver = true;
Stroke dash;
public Robots() {
setPreferredSize(new Dimension(800, 650));
setBackground(Color.white);
setForeground(Color.lightGray);
setFont(new Font("SansSerif", Font.PLAIN, 18));
setFocusable(true);
nRows = 38;
nCols = 50;
dash = new BasicStroke(2.0f, CAP_BUTT, JOIN_MITER, 10.0f,
new float[]{5.0f}, 0.0f);
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
if (gameOver) {
startNewGame();
repaint();
}
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (gameOver) return; // disable keystrokes until game starts
int keyCode = e.getKeyCode();
if (keyCode == KeyEvent.VK_NUMPAD5) {
teleport();
} else {
int k = keyCode - KeyEvent.VK_NUMPAD1;
if (k >= 0 && k < 9) {
move(k > 4 ? --k : k);
}
}
repaint();
}
});
}
void startNewGame() {
level = 1;
if (score > hiScore)
hiScore = score;
score = 0;
initGrid();
gameOver = false;
}
void initGrid() {
grid = new Grid[nRows][nCols];
teleport();
int numRobots = 7 * level;
for (int i = 0; i < numRobots;) {
int r = rand.nextInt(nRows);
int c = rand.nextInt(nCols);
if (grid[r][c] == null) {
grid[r][c] = Grid.Robot;
i++;
}
}
}
boolean movePlayer(int r, int c) {
if (grid[r][c] != null) {
gameOver = true;
} else {
grid[playerRow][playerCol] = null;
playerRow = r;
playerCol = c;
grid[r][c] = Grid.Player;
}
return !gameOver;
}
void move(int d) {
int c = playerCol + dirs[d][0];
int r = playerRow + dirs[d][1];
if (!withinBounds(r, c))
return;
if (!movePlayer(r, c))
return;
for (int rr = 0; rr < nRows; rr++)
for (int cc = 0; cc < nCols; cc++) {
if (grid[rr][cc] == Grid.Robot) {
// calc new r and c based on dx + cc and dy + rr
int nc = (c == cc ? 0 : (c - cc) / abs(c - cc)) + cc;
int nr = (r == rr ? 0 : (r - rr) / abs(r - rr)) + rr;
if (!withinBounds(nr, nc))
continue;
grid[rr][cc] = null;
if (grid[nr][nc] == Grid.Player) {
gameOver = true;
return; /* EARLY RETURN */
} else if (grid[nr][nc] != null) {
score++;
if (grid[nr][nc] != Grid.Scrap)
score++;
grid[nr][nc] = Grid.Scrap;
} else {
// avoid processing the same robot twice
grid[nr][nc] = Grid.Mark;
}
}
}
int robotsLeft = 0;
for (int rr = 0; rr < nRows; rr++)
for (int cc = 0; cc < nCols; cc++) {
if (grid[rr][cc] == Grid.Mark)
grid[rr][cc] = Grid.Robot;
if (grid[rr][cc] == Grid.Robot)
robotsLeft++;
}
if (robotsLeft == 0) {
level++;
initGrid();
}
}
void teleport() {
movePlayer(rand.nextInt(nRows), rand.nextInt(nCols));
}
void drawBorder(Graphics2D g) {
g.setStroke(dash);
g.setColor(getForeground());
g.drawRect(22, 20, getWidth() - 41, getHeight() - 72);
}
void drawGrid(Graphics2D g) {
for (int r = 0; r < nRows; r++)
for (int c = 0; c < nCols; c++) {
if (grid[r][c] != null)
g.drawString(grid[r][c].symbol, 24 + c * 15, 36 + r * 15);
}
}
void drawStartScreen(Graphics2D g) {
g.setColor(Color.gray);
g.setFont(new Font("SansSerif", Font.BOLD, 48));
g.drawString("robots", 315, 280);
g.setFont(getFont());
g.drawString("(use numpad to move player)", 270, 350);
g.drawString("(teleport is numpad 5)", 300, 380);
g.drawString("(click to start)", 328, 410);
}
void drawScore(Graphics2D g) {
g.setColor(Color.gray);
g.setFont(getFont());
String s = format("hiscore %s score %s", hiScore, score);
g.drawString(s, 30, getHeight() - 17);
}
boolean withinBounds(int r, int c) {
return c >= 0 && c < nCols && r >= 0 && r < nRows;
}
@Override
public void paintComponent(Graphics gg) {
super.paintComponent(gg);
Graphics2D g = (Graphics2D) gg;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawBorder(g);
drawScore(g);
if (gameOver) {
drawStartScreen(g);
} else {
drawGrid(g);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setTitle("Robots");
f.setResizable(false);
f.add(new Robots(), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}</lang>
=={{header|Kotlin}}==
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