如下用processing实现图片切换，改天在raspberry pi运行下看看效果
int numFrames = 5;
PImage [] images = new PImage[numFrames];
int currentFrame = 1;
void setup(){
size(440,360);
for(int i=1;i<images.length;i++){
String imageName = "frame-"+ nf(i,4)+".png";
images[i-1] = loadImage(imageName);
}
frameRate(1); //每贞一秒钟
}
void draw(){
int s = second();
// println(s);
if(s%3==0){ //每隔3秒钟换图一次
changePic();
}
}
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