PImage a;
void setup() {
a=loadImage("a.jpg");
size(200,200);
}
void draw()
{
background(255,255,255);
image(a,mouseX-100, mouseY-100);
if(mousePressed == true) {
fill(200);
rect(mouseX-100,mouseY-100,200,200);
}else{
image(a,mouseX-100, mouseY-100);
}
}