void CCPointList::addPoints(CCPointList& plist) {
while(m_count + plist.getCount() >= m_capacity) {
m_capacity *= 2;
m_buffer = (CCPoint*)realloc(m_buffer, m_capacity * sizeof(CCPoint));
}
memcpy(m_buffer + m_count, plist.getBuffer(), plist.getCount() * sizeof(CCPoint));
m_count += plist.getCount();
}
void CCCatmullRomSprite::populatePoints(const CCPointList& controlPoints, CCPointList& points) {
// clear
points.clear();
m_segmentPointIndices.clear();
// populate points segment by segment
int totalSeg = controlPoints.getCount() - 1;
for(int curSeg = 0; curSeg < totalSeg; curSeg++) {
// add start index of segment
m_segmentPointIndices.push_back(points.getCount());
// four control points
CCPoint cp0 = controlPoints.getPointAt(curSeg - 1);
CCPoint cp1 = controlPoints.getPointAt(curSeg);
CCPoint cp2 = controlPoints.getPointAt(curSeg + 1);
CCPoint cp3 = controlPoints.getPointAt(curSeg + 2);
// segment length, desired points
float curSegLen = ccpLength(ccpSub(cp2, cp1));
int curSegPoints = (int)ceilf(curSegLen / m_patternLength) + 1;
float step = 1.0f / (curSegPoints - 1);
// populate points for this segments
float lt = 0;
while(lt < 1) {
CCPoint pos = ccCardinalSplineAt(cp0, cp1, cp2, cp3, m_tension, lt);
points.addPoint(pos);
lt += step;
}
}
// last point
points.addPoint(controlPoints.getPointAt(controlPoints.getCount() - 1));
// last placeholder
m_segmentPointIndices.push_back(points.getCount());
}
