fill(255, 0, 0, 100);
noStroke();
float maxSize = map(map.getZoomLevel(), 0, 6, 4, 40);
for (Feature feature : features) {
PointFeature pf = (PointFeature) feature;
ScreenPosition pos = map.getScreenPosition(pf.getLocation());
float magnitude = (Float) feature.getProperty("magnitude");
float s = map(magnitude, 4, 8, 4, maxSize);
beginShape(QUAD);
vertex(pos.x, pos.y, 5);
vertex(pos.x + s, pos.y, 5);