Oi pessoal,
To com o seguinte problema...Tenho uma applet que é atualizada de 1 em 1 segundo, só que cada vez que ela é atualizada a tela pisca pq ele apaga e pinta de novo. Eu tentei aplicar o Double Buffer nela só que não funcionou. Será que voces sabem o que fiz de errado ou algum jeito pra parar de piscar? Valeu.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import javax.swing.JApplet;
import javax.swing.Timer;
public class TempoReal extends JApplet implements ActionListener {
private static final long serialVersionUID = 1L;
Image campo;
// The object we will use to write with instead of the standard screen graphics
Graphics bufferGraphics;
public void init()
{
setBackground(new Color(0,130,0));
campo = createImage(600,400);
bufferGraphics = campo.getGraphics();
}
public TempoReal() {
super();
setSize(600,400);
setVisible(true);
final Timer timer = new Timer(1000, this);
timer.start();
}
public void actionPerformed(final ActionEvent e) {
repaint();
}
public void paint(final Graphics g) {
Connection connection = null;
Statement statement = null;
super.paint(g);
int comprimento = 0;
int largura = 0;
int col = 0;
int linha = 0;
int row = largura;
String sessao="";
final int ambiente = Integer.parseInt(getParameter("ambiente"));
try {
Class.forName("org.postgresql.Driver");
} catch (ClassNotFoundException cnfe) {
System.out.println("Error loading driver: " + cnfe);
}
Properties userInfo = new Properties();
userInfo.put("user", "postgres");
userInfo.put("password", "postgres");
try {
connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", userInfo);
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {statement = connection.createStatement();} catch (SQLException e) {e.printStackTrace();}
String query = "SELECT MAX(\"SESS_SEQUENCIAL\") FROM \"SISTRACK_SESSAO\"";
ResultSet result = null;
try {result = statement.executeQuery(query);} catch (SQLException e) {e.printStackTrace();}
try {
result.next();
sessao = result.getString(1);
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
query = "SELECT \"AMBI_LARGURA_M\",\"AMBI_COMPRIMENTO_M\" FROM \"SISTRACK_AMBIENTE\" WHERE \"AMBI_ID\"="+ambiente;
try {
result = statement.executeQuery(query);
result.next();
largura = result.getInt(1);
comprimento = result.getInt(2);
} catch (SQLException e) {e.printStackTrace();}
bufferGraphics.clearRect(0,0,600,400);
//Pinta campo de verde
bufferGraphics.setColor(new Color(0,130,0));
bufferGraphics.fillRect(0, 0, comprimento*5+20, largura*5+30);
//bufferGraphics.setStroke(new BasicStroke(1.5f));
//Desenha as linhas
bufferGraphics.setColor(new Color(255,255,255));
//Desenha as laterais
bufferGraphics.drawRect(17, 17, (comprimento-3)*5, (largura-1)*5);
//Desenha o meio campo
bufferGraphics.drawLine((comprimento/2)*5-5,largura*5+10,(comprimento/2)*5-5,17);
//Desenha as grandes áreas
bufferGraphics.drawRect(17, ((largura-35)*5)/2, 17*5, 41*5);
bufferGraphics.drawRect((comprimento-17)*5+2, ((largura-35)*5)/2, 17*5, 41*5);
//Desenha as pequenas áreas
bufferGraphics.drawRect(17, ((largura-12)*5)/2, 6*5, 18*5);
bufferGraphics.drawRect((comprimento-6)*5+2, ((largura-12)*5)/2, 6*5, 18*5);
//Desenha marca do penalti
bufferGraphics.fillOval(17+(11*5), (largura*5)/2+13, 3, 3);
bufferGraphics.fillOval(comprimento*5-(11*5), (largura*5)/2+13, 3, 3);
//Desenha os semicírculos
//bufferGraphics.setStroke(new BasicStroke(2.0f));
bufferGraphics.drawArc(85, ((largura-40)*5)/2+79, 39, 70, 270, 180);
bufferGraphics.drawArc((comprimento-17)*5-20, ((largura-39)*5)/2+79, 40, 70, 90, 180);
//Desenha o círculo central
bufferGraphics.drawOval((comprimento*5)/2-50, (largura*5)/2-30, 90, 90);
bufferGraphics.drawOval((comprimento*5)/2-6, (largura*5)/2+15, 3, 3);
//Desenha corners
bufferGraphics.drawArc(14, 14, 10, 10, 0, -90);
bufferGraphics.drawArc(14, largura*5+5, 10, 10, 0, 90);
bufferGraphics.drawArc(comprimento*5-5, 14, 10, 10, 180, 90);
bufferGraphics.drawArc(comprimento*5-5, largura*5+5, 10, 10, 180, -90);
query = "SELECT \"TAG_NUMERO_CAMISA\", \"LOCA_COORDE_X\", \"LOCA_COORDE_Y\""+
"FROM \"SISTRACK_LOCALIZACAO\" LOCA1, \"SISTRACK_TAG\""+
"WHERE \"LOCA_TIMESTAMP\" = (SELECT MAX(\"LOCA_TIMESTAMP\") "+
"FROM \"SISTRACK_LOCALIZACAO\" LOCA2 "+
"WHERE LOCA2.\"LOCA_TAG_ID\" = LOCA1.\"LOCA_TAG_ID\")"+
"AND \"LOCA_TAG_ID\" = \"TAG_ID\"" +
"AND \"LOCA_TIMESTAMP\" BETWEEN (SELECT \"SESS_INICIO\" FROM \"SISTRACK_SESSAO\" WHERE \"SESS_SEQUENCIAL\"=1)"+
"AND (SELECT \"SESS_FIM\" FROM \"SISTRACK_SESSAO\" WHERE \"SESS_SEQUENCIAL\"=1)"+
"ORDER BY 2,3";
try {result = statement.executeQuery(query);} catch (SQLException e) {e.printStackTrace();}
bufferGraphics.setColor(new Color(255,255,255));
bufferGraphics.setFont(new Font("Sans Serif",Font.BOLD,11));
try {
while(result.next()){
bufferGraphics.setColor(new Color(255,255,255));
bufferGraphics.fillOval((result.getInt(2)-3)*5-3, (largura-result.getInt(3)-2)*5, 15, 15);
bufferGraphics.setColor(new Color(0,0,0));
if(result.getInt(1)<10){
bufferGraphics.drawString(String.valueOf(result.getInt(1)), (result.getInt(2)-3)*5+2, (largura-result.getInt(3))*5+1);
}else{
bufferGraphics.drawString(String.valueOf(result.getInt(1)), (result.getInt(2)-3)*5-2, (largura-result.getInt(3))*5+1);
}
}
}
catch (SQLException e) {
e.printStackTrace();
}
g.drawImage(campo,0,0,this);
}
public void update(Graphics g)
{
paint(g);
}
public static void main(final String[] args) {
final TempoReal tr = new TempoReal();
}
}
