[英]How do i keep track of elapsed time in Java's 3rd party API “LibGDX”?
[英]How to keep track of the elapsed time in a tick method?
在tick()方法中,不能有一个int startTime = System.nanoTime(),因为它将不断更新它。
我需要在tick方法中找到经过的时间 ,以便每2秒产生一个新对象。
public void tick() {
long startTime = System.nanoTime();
// wave 1
if (wave == 1) {
float k = System.nanoTime() - startTime;
/* won't work because "startTime" is constantly updating */
if (k >= 2 && k <= 3) {
handler.addObject(new BasicEnemy());
} else if (k >= 4 && k <= 5) {
handler.addObject(new BasicObject());
} else if (k >= 6 && k <= 7) {
handler.addObject(new BasicEnemy());
}
}
// wave 2
if (wave == 2) {
float k = System.nanoTime() - startTime;
/* won't work because "startTime" is constantly updating */
if (k >= 2 && k <= 3) {
handler.addObject(new BasicEnemy());
} else if (k >= 4 && k <= 5) {
handler.addObject(new BasicObject());
} else if (k >= 6 && k <= 7) {
handler.addObject(new BasicEnemy());
}
}
}
}
上面是代码的一小段。 我该如何在tick方法中找到经过的时间,并让它重新开始每个if语句的计数?
谢谢您的帮助 :)
您将需要在tick()
方法外部保存timeAtLastAccept
,如下所示:
long timeAtLastAccept = System.nanoTime();
public void tick(){
if(System.nanoTime()-timeAtLastAccept >threshold) {
//Spawn your objects!
timeAtLastAccept = System.nanoTime();
}
//do ticky things
}
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