java - 尝试记录按键时长时调用什么函数？ (加工)

Question

例如，如果我想记录我按下了 b 键并想记录按下该键的时间长度，我该怎么做？

Answer 1

处理起来 super 简单。看看keyPressed()和 keyReleased() .

// create a variable to store the time
int t = 0;

void setup() {
  // whatever you need to do here
}

void draw() {
  // do other stuff here
}

// when 'b' key is pressed, store the current
// time in milliseconds since the program started
void keyPressed() {
  if (key == 'b') {
    t = millis();    
  }
}

// when the 'b' key is released, subtract the start
// time from the current time to get the duration
void keyReleased() {
  if (key == 'b') {
    t = millis() - t;
    println("b key held for " + t + " milliseconds");
  } 
}