/**
* Computes a series of bounding boxes (PDRectangle) from a list of TextPositions. It will create
* a new bounding box if the vertical tolerance is exceeded
*
* @param positions
* @throws IOException
*/
public List<PDRectangle> getTextBoundingBoxes(final List<TextPosition> positions) {
final List<PDRectangle> boundingBoxes = new ArrayList<PDRectangle>();
float lowerLeftX = -1, lowerLeftY = -1, upperRightX = -1, upperRightY = -1;
boolean first = true;
for (int i = 0; i < positions.size(); i++) {
final TextPosition position = positions.get(i);
if (position == null) {
continue;
}
final Matrix textPos = position.getTextPos();
final float height = position.getHeight() * getHeightModifier();
if (first) {
lowerLeftX = textPos.getXPosition();
upperRightX = lowerLeftX + position.getWidth();
lowerLeftY = textPos.getYPosition();
upperRightY = lowerLeftY + height;
first = false;
continue;
}
// we are still on the same line
if (Math.abs(textPos.getYPosition() - lowerLeftY) <= getVerticalTolerance()) {
upperRightX = textPos.getXPosition() + position.getWidth();
upperRightY = textPos.getYPosition() + height;
} else {
final PDRectangle boundingBox =
boundingBox(lowerLeftX, lowerLeftY, upperRightX, upperRightY);
boundingBoxes.add(boundingBox);
// new line
lowerLeftX = textPos.getXPosition();
upperRightX = lowerLeftX + position.getWidth();
lowerLeftY = textPos.getYPosition();
upperRightY = lowerLeftY + height;
}
}
if (!(lowerLeftX == -1 && lowerLeftY == -1 && upperRightX == -1 && upperRightY == -1)) {
final PDRectangle boundingBox = boundingBox(lowerLeftX, lowerLeftY, upperRightX, upperRightY);
boundingBoxes.add(boundingBox);
}
return boundingBoxes;
}
