This sketch is created with an older version of Processing,
and doesn't work on browsers anymore.
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import lmu.*;
float lm;
void setup() {
size(400, 400);
}
void draw() {
fill(255, 10);
rect(0, 0, width, height);
translate(width/2, height/2);
lm = LmuTracker.getLMURight() / 10000f * 4;
fill(0, 0, 255);
ellipse(0, 0, lm, lm);
}