Java でタイル ベースのプラットフォーマー ゲームを作成しています。2 次元配列に格納されているマップをレンダリングしますが、この配列が非常に大きいと、ゲームが遅くなり始めます。マップの表示可能な部分のみをレンダリングする必要があることに気付きました。そうしようとしましたが、部分的にしか機能しない非常にハッキーなコードを書いたので、削除しました。どうすればこれを適切に行うことができますか？これが私のコードです（ハックなものはありません）。System.nanoTime()また、ではなくどのように使用できSystem.currentTimeMillis()ますか？
package sexy_robot_from_another_dimension;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.TexturePaint;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class Game extends JPanel
{
int playerX = 50;
int playerY = 50;
static boolean up = false;
static boolean down = false;
static boolean right = false;
static boolean left = false;
int playerSpeed = 1;
String[][] map;
int blockSize = 20;
int jumpLoop = 0;
int maxJumpLoop = 280;
static BufferedImage block, player;
int playerWidth = 20;
int playerHeight = 35;
int cameraX = 0;
int cameraY = 0;
long nextSecond = System.currentTimeMillis() + 1000;
int frameInLastSecond = 0;
int framesInCurrentSecond = 0;
public Game()
{
super();
try
{
map = load("/maps/map1.txt");
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Timer timer = new Timer();
TimerTask task = new TimerTask()
{
@Override
public void run()
{
if(up)
{
if((!playerIsOnBlock(playerX, playerY).equals("0")) || (!playerIsOnBlock(playerX + (playerWidth - 1), playerY).equals("0")))
{
timeToJump();
}
}
if(down)
{
}
if(right)
{
if((playerIsLeftBlock(playerX, playerY).equals("0")) && (playerIsLeftBlock(playerX, playerY + (playerHeight/2 - 1)).equals("0")) && (playerIsLeftBlock(playerX, playerY + (playerHeight - 1)).equals("0")))
{
playerX += playerSpeed;
}
}
if(left)
{
if((playerIsRightBlock(playerX, playerY).equals("0")) && (playerIsRightBlock(playerX, playerY + (playerHeight/2 - 1)).equals("0")) && (playerIsRightBlock(playerX, playerY + (playerHeight - 1)).equals("0")))
{
playerX -= playerSpeed;
}
}
repaint();
}
};
timer.scheduleAtFixedRate(task, 0, 10);
Timer timerGrav = new Timer();
TimerTask taskGrav = new TimerTask()
{
@Override
public void run()
{
if((playerIsOnBlock(playerX, playerY).equals("0")) && (playerIsOnBlock(playerX + (playerWidth - 1), playerY).equals("0")))
{
playerY += playerSpeed;
repaint();
}
}
};
timerGrav.scheduleAtFixedRate(taskGrav, 0, 6);
}
void timeToJump()
{
if(jumpLoop == 0)
{
jumpLoop = 1;
Timer timer = new Timer();
TimerTask task = new TimerTask()
{
@Override
public void run()
{
if((playerIsBelowBlock(playerX, playerY).equals("0")) && (playerIsBelowBlock(playerX + (playerWidth - 1), playerY).equals("0")))
{
playerY -= playerSpeed;
jumpLoop++;
repaint();
}
else
{
jumpLoop = maxJumpLoop;
}
if(jumpLoop == maxJumpLoop)
{
jumpLoop = 0;
cancel();
}
}
};
timer.scheduleAtFixedRate(task, 0, 3);
}
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
long currentTime = System.currentTimeMillis();
if (currentTime > nextSecond)
{
nextSecond += 1000;
frameInLastSecond = framesInCurrentSecond;
framesInCurrentSecond = 0;
}
framesInCurrentSecond++;
g.drawString(frameInLastSecond + " fps", 10, 20);
cameraX = -playerX + getWidth()/2;
cameraY = -playerY + getHeight()/2;
g.translate(cameraX, cameraY);
for (int x = 0; x < map.length; x++)
{
for (int y = 0; y < map[0].length; y++)
{
switch(map[x][y])
{
case "0":
break;
case "1":
if(block != null)
{
TexturePaint tp0 = new TexturePaint(block, new Rectangle(0, 0, blockSize, blockSize));
g2.setPaint(tp0);
}
g.fillRect(y*blockSize, x*blockSize, 20, 20);
break;
}
}
}
g.setColor(Color.BLACK);
if(player != null)
{
TexturePaint tp0 = new TexturePaint(player, new Rectangle(playerX, playerY, playerWidth, playerHeight));
g2.setPaint(tp0);
}
g.fillRect(playerX, playerY, playerWidth, playerHeight);
g.setColor(Color.black);
g.setFont(new Font("Droid Sans Mono", Font.PLAIN, 12));
g.drawString("Sexy!", playerX - 5, playerY - 10);
}
boolean outOfMap(int x, int y)
{
y -= blockSize - 1;
x -= blockSize - 1;
if((y/blockSize <= map.length - 2) && (y/blockSize >= 0) && (x/blockSize <= map[0].length-2) && (x/blockSize >= 0))
{
return false;
}
return true;
}
String playerIsOnBlock(int x, int y)
{
y += playerHeight;
if(!outOfMap(x, y))
{
if(map[y/blockSize][x/blockSize] != "0")
{
return map[y/blockSize][x/blockSize];
}
}
return "0";
}
String playerIsBelowBlock(int x, int y)
{
y -= playerSpeed;
if(!outOfMap(x, y))
{
if(map[y/blockSize][x/blockSize] != "0")
{
return map[y/blockSize][x/blockSize];
}
}
return "0";
}
String playerIsLeftBlock(int x, int y)
{
x += playerWidth;
if(!outOfMap(x, y))
{
if(map[y/blockSize][x/blockSize] != "0")
{
return map[y/blockSize][x/blockSize];
}
}
return "0";
}
String playerIsRightBlock(int x, int y)
{
x -= playerSpeed;
if(!outOfMap(x, y))
{
if(map[y/blockSize][x/blockSize] != "0")
{
return map[y/blockSize][x/blockSize];
}
}
return "0";
}
String[][] load(String file) throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(file)));
int lines = 1;
int length = br.readLine().split(" ").length;
while (br.readLine() != null) lines++;
br.close();
br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(file)));
String[][] map = new String[lines][length];
for (int i = 0; i < lines; i++)
{
String line = br.readLine();
String[] parts = line.split(" ");
for (int y = 0; y < length; y++)
{
map[i][y] = parts[y];
}
}
br.close();
return map;
}
}
ありがとうございました！