[英]Using timer to repaint
我有一个迷宫,机器人可以四处走动和探索。 我正在尝试使用计时器在机器人移动时进行重新绘制,但是由于某些原因计时器没有启动。 它没有延迟程序,所以我看不到重新绘制过程。 这是我的代码:
public void updateDrawing(Maze maze) {
// 1000 millisecond delay
Timer t = new Timer(1000, new TimerListener(maze));
t.start();
}
private class TimerListener implements ActionListener {
private Maze maze;
public TimerListener(Maze maze) {
super();
this.maze = maze;
}
public void actionPerformed(ActionEvent e) {
maze.repaint();
}
}
public void explore (int id, Maze maze) {
visited.add(maze.getCell(row, col));
//Loop until we find the cavern
outerloop: //Label the outerloop for breaking purposes
while(!foundCavern){
//Move to a Cell
Cell validCell = chooseValidCell(maze);
//If validCell is null then we have to backtrack till it's not
if(validCell == null){
while(chooseValidCell(maze) == null){
//Go back in route till we find a valid cell
Cell lastCell = route.pollLast();
if(lastCell == null){ //Implies we didn't find cavern, leave route empty
break outerloop;
}
this.row = lastCell.getRow();
this.col = lastCell.getCol();
updateDrawing(maze); // <- this calls repaint using timer
}
//Add back the current location to the route
route.add(maze.getCell(row, col));
validCell = chooseValidCell(maze);
}
this.row = validCell.getRow();
this.col = validCell.getCol();
updateDrawing(maze); // <- this calls repaint using timer
//Add to the route
route.add(validCell);
//Add to visited
visited.add(validCell);
//Check if we're at the cavern
if(row == targetCavern.getRow() && col == targetCavern.getCol()){
foundCavern = true;
}
}
}
谁能告诉我为什么? 谢谢!
尝试不使用** updateDrawing(maze)**,而是使用以下方法:
void updateMaze(){
EventQueue.invokeLater(()->updateDrawing(maze));
}
这是制作基本计时器的方法。
计算显示时间所需要做的就是记录计时器启动的时间:
long startTime = System.currentTimeMillis();
以后,当您要显示时间量时,只需从当前时间中减去。
long elapsedTime = System.currentTimeMillis() - startTime;
long elapsedSeconds = elapsedTime / 1000;
long secondsDisplay = elapsedSeconds % 60;
long elapsedMinutes = elapsedSeconds / 60;
//put here code to format and display the values
您可以让程序等到elapsedSeconds ==您想要的任何值。
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