diff options
| -rw-r--r-- | src/opengl/gl2paintengineex/qtriangulatingstroker_p.h | 146 |
1 files changed, 97 insertions, 49 deletions
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h index a0117d5..412e239 100644 --- a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h +++ b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h @@ -43,6 +43,7 @@ #define QTRIANGULATINGSTROKER_P_H #include <private/qdatabuffer_p.h> +#include <qvarlengtharray.h> #include <private/qvectorpath_p.h> #include <private/qbezier_p.h> #include <private/qnumeric_p.h> @@ -68,7 +69,7 @@ private: inline void join(const qreal *pts); inline void normalVector(float x1, float y1, float x2, float y2, float *nx, float *ny); inline void endCap(const qreal *pts); - inline void arc(float x, float y); + inline void arcPoints(float cx, float cy, float fromX, float fromY, float toX, float toY, QVarLengthArray<float> &points); void endCapOrJoinClosed(const qreal *start, const qreal *cur, bool implicitClose, bool endsAtStart); @@ -149,43 +150,73 @@ inline void QTriangulatingStroker::emitLineSegment(float x, float y, float vx, f m_vertices.add(y - vy); } - - -// We draw a full circle for any round join or round cap which is a -// bit of overkill... -inline void QTriangulatingStroker::arc(float x, float y) +inline void QTriangulatingStroker::arcPoints(float cx, float cy, float fromX, float fromY, float toX, float toY, QVarLengthArray<float> &points) { - float dx = m_width; - float dy = 0; - for (int i=0; i<=m_roundness; ++i) { - float tmpx = dx * m_cos_theta - dy * m_sin_theta; - float tmpy = dx * m_sin_theta + dy * m_cos_theta; - dx = tmpx; - dy = tmpy; - emitLineSegment(x, y, dx, dy); + float dx1 = fromX - cx; + float dy1 = fromY - cy; + float dx2 = toX - cx; + float dy2 = toY - cy; + + // while more than 180 degrees left: + while (dx1 * dy2 - dx2 * dy1 < 0) { + float tmpx = dx1 * m_cos_theta - dy1 * m_sin_theta; + float tmpy = dx1 * m_sin_theta + dy1 * m_cos_theta; + dx1 = tmpx; + dy1 = tmpy; + points.append(cx + dx1); + points.append(cy + dy1); } -} + // while more than 90 degrees left: + while (dx1 * dx2 + dy1 * dy2 < 0) { + float tmpx = dx1 * m_cos_theta - dy1 * m_sin_theta; + float tmpy = dx1 * m_sin_theta + dy1 * m_cos_theta; + dx1 = tmpx; + dy1 = tmpy; + points.append(cx + dx1); + points.append(cy + dy1); + } + + // while more than 0 degrees left: + while (dx1 * dy2 - dx2 * dy1 > 0) { + float tmpx = dx1 * m_cos_theta - dy1 * m_sin_theta; + float tmpy = dx1 * m_sin_theta + dy1 * m_cos_theta; + dx1 = tmpx; + dy1 = tmpy; + points.append(cx + dx1); + points.append(cy + dy1); + } + // remove last point which was rotated beyond [toX, toY]. + if (!points.isEmpty()) + points.resize(points.size() - 2); +} -inline void QTriangulatingStroker::endCap(const qreal *pts) +inline void QTriangulatingStroker::endCap(const qreal *) { switch (m_cap_style) { case Qt::FlatCap: break; - case Qt::SquareCap: { - float dx = m_cx - *(pts - 2); - float dy = m_cy - *(pts - 1); - - float len = m_width / sqrt(dx * dx + dy * dy); - dx = dx * len; - dy = dy * len; - - emitLineSegment(m_cx + dx, m_cy + dy, m_nvx, m_nvy); - break; } - case Qt::RoundCap: - arc(m_cx, m_cy); + case Qt::SquareCap: + emitLineSegment(m_cx + m_nvy, m_cy - m_nvx, m_nvx, m_nvy); break; + case Qt::RoundCap: { + QVarLengthArray<float> points; + int count = m_vertices.size(); + arcPoints(m_cx, m_cy, m_vertices.at(count - 2), m_vertices.at(count - 1), m_vertices.at(count - 4), m_vertices.at(count - 3), points); + int front = 0; + int end = points.size() / 2; + while (front != end) { + m_vertices.add(points[2 * end - 2]); + m_vertices.add(points[2 * end - 1]); + --end; + if (front == end) + break; + m_vertices.add(points[2 * front + 0]); + m_vertices.add(points[2 * front + 1]); + ++front; + } + break; } default: break; // to shut gcc up... } } @@ -214,31 +245,37 @@ void QTriangulatingStroker::moveTo(const qreal *pts) } break; case Qt::SquareCap: { - float dx = x2 - m_cx; - float dy = y2 - m_cy; - float len = m_width / sqrt(dx * dx + dy * dy); - dx = dx * len; - dy = dy * len; - float sx = m_cx - dx; - float sy = m_cy - dy; + float sx = m_cx - m_nvy; + float sy = m_cy + m_nvx; if (invisibleJump) { m_vertices.add(sx + m_nvx); m_vertices.add(sy + m_nvy); } emitLineSegment(sx, sy, m_nvx, m_nvy); break; } - case Qt::RoundCap: - if (invisibleJump) { - m_vertices.add(m_cx + m_nvx); - m_vertices.add(m_cy + m_nvy); + case Qt::RoundCap: { + QVarLengthArray<float> points; + arcPoints(m_cx, m_cy, m_cx + m_nvx, m_cy + m_nvy, m_cx - m_nvx, m_cy - m_nvy, points); + m_vertices.resize(m_vertices.size() + points.size() + 2 * int(invisibleJump)); + int count = m_vertices.size(); + int front = 0; + int end = points.size() / 2; + while (front != end) { + m_vertices.at(--count) = points[2 * end - 1]; + m_vertices.at(--count) = points[2 * end - 2]; + --end; + if (front == end) + break; + m_vertices.at(--count) = points[2 * front + 1]; + m_vertices.at(--count) = points[2 * front + 0]; + ++front; } - // This emitLineSegment is not needed for the arc, but we need - // to start where we put the invisibleJump vertex, otherwise - // we'll have visible triangles between subpaths. - emitLineSegment(m_cx, m_cy, m_nvx, m_nvy); - arc(m_cx, m_cy); - break; + if (invisibleJump) { + m_vertices.at(count - 1) = m_vertices.at(count + 1); + m_vertices.at(count - 2) = m_vertices.at(count + 0); + } + break; } default: break; // ssssh gcc... } emitLineSegment(m_cx, m_cy, m_nvx, m_nvy); @@ -289,10 +326,21 @@ void QTriangulatingStroker::join(const qreal *pts) // what some other graphics API's do. break; } - case Qt::RoundJoin: - arc(m_cx, m_cy); - break; - + case Qt::RoundJoin: { + QVarLengthArray<float> points; + int count = m_vertices.size(); + float prevNvx = m_vertices.at(count - 2) - m_cx; + float prevNvy = m_vertices.at(count - 1) - m_cy; + if (m_nvx * prevNvy - m_nvy * prevNvx < 0) { + arcPoints(0, 0, m_nvx, m_nvy, -prevNvx, -prevNvy, points); + for (int i = points.size() / 2; i > 0; --i) + emitLineSegment(m_cx, m_cy, points[2 * i - 2], points[2 * i - 1]); + } else { + arcPoints(0, 0, -prevNvx, -prevNvy, m_nvx, m_nvy, points); + for (int i = 0; i < points.size() / 2; ++i) + emitLineSegment(m_cx, m_cy, points[2 * i + 0], points[2 * i + 1]); + } + break; } default: break; // gcc warn-- } |