float StraightPath::advance(const glm::vec3 & pos, const float dist) const {
if (!isOnPath(pos)) {
LOG_WARNING("pos not on path");
return -1.f;
}
const auto newPos = pos + dist * glm::normalize(m_b - m_a);
return glm::length(newPos - m_a) / glm::length(m_b - m_a);
}
QVector<QPointF> ArtisticTextShape::calculateAbstractCharacterPositions()
{
const int totalTextLength = plainText().length();
QVector<QPointF> charPositions;
// one more than the number of characters for position after the last character
charPositions.resize(totalTextLength+1);
// the character index within the text shape
int globalCharIndex = 0;
QPointF charPos(0, 0);
QPointF advance(0, 0);
const bool attachedToPath = isOnPath();
foreach(const ArtisticTextRange &range, m_ranges) {
QFontMetricsF metrics(QFont(range.font(), &m_paintDevice));
const QString textRange = range.text();
const qreal letterSpacing = range.letterSpacing();
const int localTextLength = textRange.length();
const bool absoluteXOffset = range.xOffsetType() == ArtisticTextRange::AbsoluteOffset;
const bool absoluteYOffset = range.yOffsetType() == ArtisticTextRange::AbsoluteOffset;
// set baseline shift
const qreal baselineShift = baselineShiftForFontSize(range, defaultFont().pointSizeF());
for(int localCharIndex = 0; localCharIndex < localTextLength; ++localCharIndex, ++globalCharIndex) {
// apply offset to character
if (range.hasXOffset(localCharIndex)) {
if (absoluteXOffset)
charPos.rx() = range.xOffset(localCharIndex);
else
charPos.rx() += range.xOffset(localCharIndex);
} else {
charPos.rx() += advance.x();
}
if (range.hasYOffset(localCharIndex)) {
if (absoluteYOffset) {
// when attached to a path, absolute y-offsets are ignored
if (!attachedToPath)
charPos.ry() = range.yOffset(localCharIndex);
} else {
charPos.ry() += range.yOffset(localCharIndex);
}
} else {
charPos.ry() += advance.y();
}
// apply baseline shift
charPos.ry() += baselineShift;
// save character position of current character
charPositions[globalCharIndex] = charPos;
// advance character position
advance = QPointF(metrics.width(textRange[localCharIndex])+letterSpacing, 0.0);
charPos.ry() -= baselineShift;
}
}