final processing code
int val = 0;
PImage img1; PImage img2; PImage img3; PImage img4;
void setup() { size(displayWidth,displayHeight); background(241,238,251); noStroke(); img1 = loadImage("3-01.png"); img2 = loadImage("11-01.png"); img3 = loadImage("11-01-01.png"); img4 = loadImage("11-01-01-01.png"); }
void draw(){ switch(val){
case 0: background(0); break;
case 1: image(img1,0,0,width,height); break;
case 2: image(img2,0,0,width,height); break;
case 3: image(img3,0,0,width,height); break;
case 4: image(img4,0,0,width,height); break; } }
void keyPressed(){ if (key == 'D'){ val = val + 1; if(val > 4){ val = 0;
println(val);
} } }




















