boolean notWorkable;
StringBuilder result = new StringBuilder();
for (int i = 0; i < 7; i++) {
notWorkable = calendar.getCapacityOn(PartialDay.wholeDay(day))
.isZero();
day = day.plusDays(1);
result.append(notWorkable ? i * WEEK_LEVEL_SHADE_WIDTH
: -WEEK_LEVEL_SHADE_WIDTH);
result.append("px 0");
if (i != 6) {
result.append(",");