如何制作渐隐渐现的幻灯片切换效果呢？求问

[fengenjoy]

如题，如何在切换图片时候加入一个渐隐渐现的效果呢，下面是一个普通的幻灯片代码

程序代码

String[] filenames = {"feng1.jpg", "feng2.jpg", "feng3.jpg", "feng4.jpg" , "feng5.jpg"}; // fotos im data ordner
 
 
PImage[] images = new PImage[filenames.length];
int imageIndex = 0;
 
//Timer
int savedTime;
int totalTime = 30000;
 
  
void setup() {
  size(467,400); //angegebene größe aus unterricht
  //background (0);
   
  
 //Timer
savedTime = millis();
    
  for(int i = 0; i<filenames.length; i++)
  { images[i] = loadImage(filenames[i]);    
  } 
 
 
}
  
void draw() {
  background(255);  
   
  //timer
  int passedTime = millis() - savedTime;
   
  image(images[imageIndex],0,0,width,height); 
   
   
  if (passedTime > totalTime) {
  println ("30 seconds have passed!");
  imageIndex++;
  savedTime = millis();
  }
   
  if (imageIndex>filenames.length-1)
  imageIndex = 0;
 
 
}

[RavenKwok]

建立一个空白的PImage 对象。http://processing.org/reference/createImage_.html

然后遍历操作每个像素的颜色变化。http://processing.org/reference/lerpColor_.html

当然你也可以直接绘制两个图片，用tint() 来操作它们的透明图变化。http://processing.org/reference/tint_.html