/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package samples.websocket.undertow.snake;
import java.awt.Color;
import java.util.Iterator;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
public class SnakeWebSocketHandler extends TextWebSocketHandler {
public static final int PLAYFIELD_WIDTH = 640;
public static final int PLAYFIELD_HEIGHT = 480;
public static final int GRID_SIZE = 10;
private static final AtomicInteger snakeIds = new AtomicInteger(0);
private static final Random random = new Random();
private final int id;
private Snake snake;
public static String getRandomHexColor() {
float hue = random.nextFloat();
// sat between 0.1 and 0.3
float saturation = (random.nextInt(2000) + 1000) / 10000f;
float luminance = 0.9f;
Color color = Color.getHSBColor(hue, saturation, luminance);
return '#' + Integer.toHexString((color.getRGB() & 0xffffff) | 0x1000000)
.substring(1);
}
public static Location getRandomLocation() {
int x = roundByGridSize(random.nextInt(PLAYFIELD_WIDTH));
int y = roundByGridSize(random.nextInt(PLAYFIELD_HEIGHT));
return new Location(x, y);
}
private static int roundByGridSize(int value) {
value = value + (GRID_SIZE / 2);
value = value / GRID_SIZE;
value = value * GRID_SIZE;
return value;
}
public SnakeWebSocketHandler() {
this.id = snakeIds.getAndIncrement();
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
this.snake = new Snake(this.id, session);
SnakeTimer.addSnake(this.snake);
StringBuilder sb = new StringBuilder();
for (Iterator<Snake> iterator = SnakeTimer.getSnakes().iterator(); iterator
.hasNext();) {
Snake snake = iterator.next();
sb.append(String.format("{id: %d, color: '%s'}",
Integer.valueOf(snake.getId()), snake.getHexColor()));
if (iterator.hasNext()) {
sb.append(',');
}
}
SnakeTimer
.broadcast(String.format("{'type': 'join','data':[%s]}", sb.toString()));
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message)
throws Exception {
String payload = message.getPayload();
if ("west".equals(payload)) {
this.snake.setDirection(Direction.WEST);
}
else if ("north".equals(payload)) {
this.snake.setDirection(Direction.NORTH);
}
else if ("east".equals(payload)) {
this.snake.setDirection(Direction.EAST);
}
else if ("south".equals(payload)) {
this.snake.setDirection(Direction.SOUTH);
}
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status)
throws Exception {
SnakeTimer.removeSnake(this.snake);
SnakeTimer.broadcast(
String.format("{'type': 'leave', 'id': %d}", Integer.valueOf(this.id)));
}
}