PImage img,img1;
int x = 0;
int d = 1;
 
void setup() {
size(1200, 800);
img1 = loadImage("1.png");
img= loadImage("2.png");
}
void draw() {
image(img, 0, 0, width, height);
image(img1, x, 375, 450, 250);
if( x < 850 && d == 1)
{x = x + 10 ;}
else
{ d = 2 ;}
if (x > 0 && d == 2)
{x = x - 10;}
else {d = 1 ;}
}