Hi there,

I have a very simply tracking task in which people track a ball with their mouse. Currently the ball bounces off the edges of the screen, however I would like it to follow along a smooth curve (basically so that accuracy is not impeded by the bounce movement. Any help would be much appreciated!

This is the tracking task:

```
PrintWriter out;
void setup() {
fullScreen();
//size(640, 360);
noStroke();
frameRate(30);
fill(0,0,400);
ellipseMode(RADIUS);
// Set the starting position of the shape
xpos = width/2;
ypos = height/2;
out = createWriter("M:\\Tracking_Taskworking\\accuracy.csv");
}
int rad = 12; // Width of the shape
//float xpos, ypos; // Starting position of shape
float xpos, ypos; // Starting position of shape
float xspeed = 3; // Speed of the shape
float yspeed = 3; // Speed of the shape
int xdirection = 1; // Left or Right
int ydirection = 1; // Top to Bottom
double dist; //distance between cursor and moving target
void draw()
{
background(1);
// Update the position of the shape
xpos = xpos + ( xspeed * xdirection );
ypos = ypos + ( yspeed * ydirection );
// Test to see if the shape exceeds the boundaries of the screen
// If it does, reverse its direction by multiplying by -1
if (xpos > width-rad || xpos < rad) {
xdirection *= -1;
}
if (ypos > height-rad || ypos < rad) {
ydirection *= -1;
}
// Draw the shape
ellipse(xpos, ypos, rad, rad);
// Calculate distance between cursor and moving target
dist = (Math.sqrt((xpos-mouseX)*(xpos-mouseX) + ((ypos-mouseY)*(ypos-mouseY))));
out.println((int)dist+","+(int)millis());
out.flush();
}
```