static {
points = Collections.synchronizedList(new ArrayList<DrawObject>());
lines = Collections.synchronizedList(new ArrayList<DrawObject>());
ovals = Collections.synchronizedList(new ArrayList<DrawObject>());
rectangles = Collections.synchronizedList(new ArrayList<DrawObject>());
images = Collections.synchronizedList(new ArrayList<DrawObject>());
labels = Collections.synchronizedList(new ArrayList<DrawObject>());
scribbles = Collections.synchronizedList(new ArrayList<DrawObject>());
eqnLines = Collections.synchronizedList(new ArrayList<DrawObject>());
animPoints = Collections.synchronizedList(new ArrayList<DrawObject>());
animLines = Collections.synchronizedList(new ArrayList<DrawObject>());
animOvals = Collections.synchronizedList(new ArrayList<DrawObject>());
animRectangles = Collections.synchronizedList(new ArrayList<DrawObject>());
animLabels = Collections.synchronizedList(new ArrayList<DrawObject>());
df.setMaximumFractionDigits(4);
}
