float s, sNorm, lineY, squareX, squareSize;
color Clr;
float mouseXNorm = 0;

void setup(){
size(400,200);
noFill();
rectMode(CENTER);
lineY=height;
squareSize=20;
Clr=color(255,0,0);
}

void draw(){
background(0);
int jump = 8*mouseX/width;
squareX =width/16+jump*width/8;
rect(squareX,100,squareSize,squareSize);
stroke(Clr);
line(mouseX,0,mouseX,lineY);
stroke(255,80);
int i;
for(i=0; i<width; i+=50){
line(i,30,i,lineY-30);
}
}