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我想让一组数组淡出，直到添加了该组中的最后一个数组对象。我使用millis() 使每三个对象以较慢的速度淡出！所以我创建了一个名为的函数boolean timelag(int time, int number)，每次我将时间和序列号传递给它，并期望它会在每三个对象创建后 2 秒后淡出，但似乎什么也没发生

void draw() {
  background(255, 255, 255);

  for (int i=0; i<zoog.length; i++) {
    zoog[i].jiggle();
    zoog[i].display();
    if(i%3 ==0 && i>=3){
       time = millis();
       timelag(time,i);
    }    
  }
  if(fadeout){
      zoog[thatnumber].disappear();
      zoog[thatnumber-1].disappear();
      zoog[thatnumber-2].disappear(); 
    }
}

我的延时功能：

boolean timelag(int time, int number){
  int thattime = time;
  if(millis()-thattime>2000){
    thatnumber = number;
    fadeout = true;
  }
  else 
   fadeout = false;


  return fadeout;
}

整个代码在这里

Zoog[]zoog = new Zoog[1];
float count=0;
int xpos =0;
int ypos =0;
String message="haha";
int ntextsize = 20;
int nopacity =200;
int thistime = 0;
int thiscount = 0;
int time =0;
int number =0;
boolean fadeout = false;
int thatnumber=0;


//Zoog zoog;

void setup() {
  size(400, 400);
  xpos = int(random(width/2-200, width/2+40));
  ypos = int(random(height/2, height/2-40));
  zoog[0] = new Zoog(xpos, ypos, message, nopacity);
}

void draw() {
  background(255, 255, 255);

  for (int i=0; i<zoog.length; i++) {
    zoog[i].jiggle();
    zoog[i].display();
    if(i%3 ==0 && i>=3){
       time = millis();
       timelag(time,i);
    }    
  }
  if(fadeout){
      zoog[thatnumber].disappear();
      zoog[thatnumber-1].disappear();
      zoog[thatnumber-2].disappear(); 
    }
}


void mousePressed() {
  count = count + 1;
  // int thiscount = 0;
  if (count%3 ==0) {
    xpos=int(random(30, width-30));
    ypos=int(random(10, height-10));
  }
  else {
    ypos = ypos+50;
  }


nopacity = int(random(100, 255));
// text(message, xpos, ypos);
Zoog b = new Zoog(xpos, ypos, message, nopacity);
zoog =(Zoog[]) append(zoog, b);

}

boolean timelag(int time, int number){
  int thattime = time;
  if(millis()-thattime>2000){
    thatnumber = number;
    fadeout = true;
  }
  else 
   fadeout = false;


  return fadeout;
}

class Zoog {
  int x;
  int y;
  String thatmessage;

  int opaci =0;

  Zoog(int xpo, int ypo, String thismessage, int opa) {
    x = xpo;
    y = ypo;
    thatmessage = thismessage;

    opaci = opa;
  }

  void jiggle() {

    x = x+int(random(-2, 2));
    y = y+int(random(-2, 2));
  }

  void display() {

    fill(0, opaci);
    text(thatmessage, x, y);
    print("x position is "+ x);
    print("y position is "+y);
  }

  void disappear() {
    for (int j=0; j<255; j++) {
      opaci = opaci -j;
    }
  }
}
4

2 回答 2

2

我假设当你写...

if(fadeout) { ... }

你的意思是...

if(timelag()) { ... }

在您的 timelag 函数中，仅从函数返回 true 或 false 而不是返回变量更具可读性和更快（即使是微小的），除非在整个项目中一遍又一遍地需要该变量，这看起来不像是，如果它是更改的函数，则通常不需要返回值，除非您正在检查更改是否发生的布尔值。

boolean timelag(int time, int number){
  //int thattime = time; //You also don't need to create this you 
  //can simply use the time you're getting in the boolean statement
  if(millis()-time>2000){
    thatnumber = number;
    return true;
  }
  else {
    return false;
  }
}

此外，如果您尝试修复每个zoog 淡出所需的时间，您需要给它们一个数字，然后在每次调用消失函数时减少该数字。将 for 循环从消失中取出，让它在绘制循环中的每次调用中减去一个单位。

void disappear() {
   opacity -= somenumber //somenumber is usually something small and you can tweak it. 
   if (opacity == 0) {
      dead = true;
   }
}

您可以将绘图循环视为您的 for 循环。如果你嵌入了太多的单数 for 循环，它会减慢程序的运行速度。现在，您可能甚至没有看到它们逐渐消失，并且您可能不会以现在编写代码的方式摆脱它们。

当你测试它时，你可以调整这个数字，直到找到最佳位置。如果你想对所有这些概念有一个惊人的概述，你可以看看这里。Shiffman 深入探讨了我们在这里讨论的各个方面，而且阅读起来既简短又有趣。

于 2013-05-15T23:36:00.230 回答
1

我第一次阅读另一篇文章时，我误解了你的目标。无论如何，我已经对您的代码进行了一些调整，这可能会帮助您理解要走的路。但是我没有将它移动到 ArrayList，所以下面的这段代码，有点糟糕......它只能帮助你把事情弄清楚......

Zoog[]zoog = new Zoog[1];
float count=0;
int xpos =0;
int ypos =0;
String message="haha";
int ntextsize = 20;
int nopacity =200;
int thistime = 0;
int thiscount = 0;
//Zoog zoog;

void setup() {
  size(400, 400);
  xpos = int(random(width/2-200, width/2+40));
  ypos = int(random(height/2, height/2-40));
  zoog[0] = new Zoog(xpos, ypos, message, nopacity);
}

void draw() {
  background(255);

  for (int i=0; i<zoog.length; i++) {
    zoog[i].jiggle();
    zoog[i].display();  }
}




void mousePressed() {
  count = count + 1;
  // int thiscount = 0;
  if (count%3 ==0) {
    xpos=int(random(30, width-30));
    ypos=int(random(10, height-10));
  }
  else {
    ypos = ypos+50;
    //   thiscount = thiscount +1;
    //   thistime = millis();
    //  }
  }


  nopacity = int(random(100, 255));
  text(message, xpos, ypos);
  Zoog b = new Zoog(mouseX, mouseY, message, nopacity);
  zoog = (Zoog[]) append(zoog, b);

  zoog[zoog.length -2].disappear = true;
}





class Zoog {
  int x;
  int y;
  String thatmessage;
  boolean disappear;

  int opaci =0;

  Zoog(int xpo, int ypo, String thismessage, int opa) {
    x = xpo;
    y = ypo;
    thatmessage = thismessage;

    opaci = opa;
  }

  void jiggle() {

    x = x+int(random(-2, 2));
    y = y+int(random(-2, 2));
  }

  void display() {
    if(disappear)
    disappear();
    fill(0, opaci);
    text(thatmessage, x, y);
  }

  void disappear() {

    opaci-=0.5;

  }
}
于 2013-05-15T22:16:19.733 回答