float a, a_abs, v, dt;
float v1, v2;
float fps;
float pos, diff;
boolean drag;

void setup() {
	size(1250, 150);
	fps = 60;
	a_abs = 200;
	pos = width/2;
	v = v1 = v2 = 0;
	a = 0;
	drag = false;

	background(0);
	stroke(255);
	noFill();
	frameRate(fps);
}

void draw() {
	dt = 1 / frameRate;
	if(drag){
		v2 = v1;
		v1 = (mouseX - pmouseX) / dt;
		v = (v1 + v2)/2;
		pos = mouseX - diff;
	}
	if( !drag ){
		if(v != 0) a = -1 *  v / abs(v) * a_abs;
		v += a * dt;
		pos += v * dt;
		if( pos < -50 ) pos += width+50;
		else if( pos > width ) pos -= width+50;
		if( abs(v) < 10 ){
			v = 0;
			a = 0;
		}
	}
	background(0);
	translate(pos, height/2-25);
	noFill();
	ellipse(0, 0, 50, 50);
	line(25,0,100,0);
	line(50,0,50,50);
	line(100,0,100,50);
	line(100,50,150,50);
}

void mousePressed(){
	if( pos-25 < mouseX && mouseX < pos+150
	&& height/2-50 < mouseY && mouseY < height/2+40){
		drag = true;
		v = v1 = v2 = 0;
		a = 0;
		diff = mouseX - pos;
	}
}

void mouseReleased(){
	if(drag){
		drag = false;
	}
}