/*
* Calculates flat path points for current segment of the source shape.
*
* Line segment is flat by itself. Flatness of quad and cubic curves evaluated by getFlatnessSq() method.
* Curves subdivided until current flatness is bigger than user defined and subdivision limit isn't exhausted.
* Single source segment translated to series of buffer points. The less flatness the bigger serries.
* Every currentSegment() call extract one point from the buffer. When series completed evaluate() takes next source shape segment.
*/
void evaluate()
{
if (bufEmpty)
{
bufType = p.currentSegment(coords);
}
switch (bufType)
{
case PathIteratorConstants.SEG_MOVETO:
case PathIteratorConstants.SEG_LINETO:
px = coords[0];
py = coords[1];
break;
case PathIteratorConstants.SEG_QUADTO:
if (bufEmpty)
{
bufIndex -= 6;
buf[bufIndex + 0] = px;
buf[bufIndex + 1] = py;
java.lang.SystemJ.arraycopy(coords, 0, buf, bufIndex + 2, 4);
bufSubdiv = 0;
}
while (bufSubdiv < bufLimit)
{
if (QuadCurve2D.getFlatnessSq(buf, bufIndex) < flatness2)
{
break;
}
// Realloc buffer
if (bufIndex <= 4)
{
double[] tmp = new double[bufSize + BUFFER_CAPACITY];
java.lang.SystemJ.arraycopy(
buf, bufIndex,
tmp, bufIndex + BUFFER_CAPACITY,
bufSize - bufIndex);
buf = tmp;
bufSize += BUFFER_CAPACITY;
bufIndex += BUFFER_CAPACITY;
}
QuadCurve2D.subdivide(buf, bufIndex, buf, bufIndex - 4, buf, bufIndex);
bufIndex -= 4;
bufSubdiv++;
}
bufIndex += 4;
px = buf[bufIndex];
py = buf[bufIndex + 1];
bufEmpty = (bufIndex == bufSize - 2);
if (bufEmpty)
{
bufIndex = bufSize;
bufType = PathIteratorConstants.SEG_LINETO;
}
break;
case PathIteratorConstants.SEG_CUBICTO:
if (bufEmpty)
{
bufIndex -= 8;
buf[bufIndex + 0] = px;
buf[bufIndex + 1] = py;
java.lang.SystemJ.arraycopy(coords, 0, buf, bufIndex + 2, 6);
bufSubdiv = 0;
}
while (bufSubdiv < bufLimit)
{
if (CubicCurve2D.getFlatnessSq(buf, bufIndex) < flatness2)
{
break;
}
// Realloc buffer
if (bufIndex <= 6)
{
double [] tmp = new double[bufSize + BUFFER_CAPACITY];
java.lang.SystemJ.arraycopy(
buf, bufIndex,
tmp, bufIndex + BUFFER_CAPACITY,
bufSize - bufIndex);
buf = tmp;
bufSize += BUFFER_CAPACITY;
bufIndex += BUFFER_CAPACITY;
}
CubicCurve2D.subdivide(buf, bufIndex, buf, bufIndex - 6, buf, bufIndex);
bufIndex -= 6;
bufSubdiv++;
}
bufIndex += 6;
px = buf[bufIndex];
py = buf[bufIndex + 1];
bufEmpty = (bufIndex == bufSize - 2);
if (bufEmpty)
{
bufIndex = bufSize;
bufType = PathIteratorConstants.SEG_LINETO;
}
break;
}
}
