static inline SplineStore qwtSplinePathX(
const QwtSplineC1 *spline, const QPolygonF &points )
{
SplineStore store;
const int n = points.size();
const QVector<double> m = spline->slopesX( points );
if ( m.size() != n )
return store;
const QPointF *pd = points.constData();
const double *md = m.constData();
store.init( m.size() - 1 );
store.start( pd[0].x(), pd[0].y() );
for ( int i = 0; i < n - 1; i++ )
{
const double dx3 = ( pd[i+1].x() - pd[i].x() ) / 3.0;
store.addCubic( pd[i].x() + dx3, pd[i].y() + md[i] * dx3,
pd[i+1].x() - dx3, pd[i+1].y() - md[i+1] * dx3,
pd[i+1].x(), pd[i+1].y() );
}
return store;
}
static SplineStore qwtSplinePathPleasing( const QPolygonF &points,
bool isClosed, Param param )
{
const int size = points.size();
const QPointF *p = points.constData();
SplineStore store;
store.init( isClosed ? size : size - 1 );
store.start( p[0] );
const QPointF &p0 = isClosed ? p[size-1] : p[0];
double d13 = param(p[0], p[2]);
const QwtSplineCardinalG1::Tension t0 = qwtTension(
param(p0, p[1]), param(p[0], p[1]), d13, p0, p[0], p[1], p[2] );
const QPointF vec0 = ( p[1] - p0 ) * 0.5;
QPointF vec1 = ( p[2] - p[0] ) * 0.5;
store.addCubic( p[0] + vec0 * t0.t1, p[1] - vec1 * t0.t2, p[1] );
for ( int i = 1; i < size - 2; i++ )
{
const double d23 = param(p[i], p[i+1]);
const double d24 = param(p[i], p[i+2]);
const QPointF vec2 = ( p[i+2] - p[i] ) * 0.5;
const QwtSplineCardinalG1::Tension t =
qwtTension( d13, d23, d24, p[i-1], p[i], p[i+1], p[i+2] );
store.addCubic( p[i] + vec1 * t.t1, p[i+1] - vec2 * t.t2, p[i+1] );
d13 = d24;
vec1 = vec2;
}
const QPointF &pn = isClosed ? p[0] : p[size-1];
const double d24 = param( p[size-2], pn );
const QwtSplineCardinalG1::Tension tn = qwtTension(
d13, param( p[size-2], p[size-1] ), d24, p[size-3], p[size-2], p[size-1], pn );
const QPointF vec2 = 0.5 * ( pn - p[size-2] );
store.addCubic( p[size-2] + vec1 * tn.t1, p[size-1] - vec2 * tn.t2, p[size-1] );
if ( isClosed )
{
const double d34 = param( p[size-1], p[0] );
const double d35 = param( p[size-1], p[1] );
const QPointF vec3 = 0.5 * ( p[1] - p[size-1] );
const QwtSplineCardinalG1::Tension tn =
qwtTension( d24, d34, d35, p[size-2], p[size-1], p[0], p[1] );
store.addCubic( p[size-1] + vec2 * tn.t1, p[0] - vec3 * tn.t2, p[0] );
}
return store;
}
//! Wrapper for QPainter::drawPolyline()
void QwtPainter::drawPolyline( QPainter *painter, const QPolygonF &polygon )
{
QRectF clipRect;
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
QPolygonF cpa = polygon;
if ( deviceClipping )
cpa = QwtClipper::clipPolygonF( clipRect, cpa );
qwtDrawPolyline<QPointF>( painter,
cpa.constData(), cpa.size(), d_polylineSplitting );
}
/*!
\fn QPolygonF QMatrix::map(const QPolygonF &polygon) const
\overload
Creates and returns a QPolygonF object that is a copy of the given
\a polygon, mapped into the coordinate system defined by this
matrix.
*/
QPolygonF QMatrix::map(const QPolygonF &a) const
{
int size = a.size();
int i;
QPolygonF p(size);
const QPointF *da = a.constData();
QPointF *dp = p.data();
for(i = 0; i < size; i++) {
MAPDOUBLE(da[i].xp, da[i].yp, dp[i].xp, dp[i].yp);
}
return p;
}
void QgsCoordinateTransform::transformPolygon( QPolygonF &poly, TransformDirection direction ) const
{
if ( !d->mIsValid || d->mShortCircuit )
{
return;
}
//create x, y arrays
int nVertices = poly.size();
QVector<double> x( nVertices );
QVector<double> y( nVertices );
QVector<double> z( nVertices );
double *destX = x.data();
double *destY = y.data();
double *destZ = z.data();
const QPointF *polyData = poly.constData();
for ( int i = 0; i < nVertices; ++i )
{
*destX++ = polyData->x();
*destY++ = polyData->y();
*destZ++ = 0;
polyData++;
}
try
{
transformCoords( nVertices, x.data(), y.data(), z.data(), direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( QStringLiteral( "rethrowing exception" ) );
throw;
}
QPointF *destPoint = poly.data();
const double *srcX = x.constData();
const double *srcY = y.constData();
for ( int i = 0; i < nVertices; ++i )
{
destPoint->rx() = *srcX++;
destPoint->ry() = *srcY++;
destPoint++;
}
}
QPolygonF QwtSplineC1::polygonX( int numPoints, const QPolygonF &points ) const
{
if ( points.size() <= 2 )
return points;
QPolygonF fittedPoints;
const QVector<double> m = slopesX( points );
if ( m.size() != points.size() )
return fittedPoints;
const QPointF *p = points.constData();
const double *s = m.constData();
const double x1 = points.first().x();
const double x2 = points.last().x();
const double delta = ( x2 - x1 ) / ( numPoints - 1 );
double x0, y0;
QwtSplinePolynom polynom;
for ( int i = 0, j = 0; i < numPoints; i++ )
{
double x = x1 + i * delta;
if ( x > x2 )
x = x2;
if ( i == 0 || x > p[j + 1].x() )
{
while ( x > p[j + 1].x() )
j++;
polynom = QwtSplinePolynom::fromSlopes( p[j], s[j], p[j + 1], s[j + 1] );
x0 = p[j].x();
y0 = p[j].y();
}
const double y = y0 + polynom.value( x - x0 );
fittedPoints += QPointF( x, y );
}
return fittedPoints;
}
static SplineStore qwtSplinePathG1(
const QwtSplineCardinalG1 *spline, const QPolygonF &points )
{
const int size = points.size();
const int numTensions = spline->isClosing() ? size : size - 1;
const QVector<QwtSplineCardinalG1::Tension> tensions2 = spline->tensions( points );
if ( tensions2.size() != numTensions )
return SplineStore();
const QPointF *p = points.constData();
const QwtSplineCardinalG1::Tension *t = tensions2.constData();
SplineStore store;
store.init( numTensions );
store.start( p[0] );
const QPointF &p0 = spline->isClosing() ? p[size-1] : p[0];
QPointF vec1 = ( p[1] - p0 ) * 0.5;
for ( int i = 0; i < size - 2; i++ )
{
const QPointF vec2 = ( p[i+2] - p[i] ) * 0.5;
store.addCubic( p[i] + vec1 * t[i].t1,
p[i+1] - vec2 * t[i].t2, p[i+1] );
vec1 = vec2;
}
const QPointF &pn = spline->isClosing() ? p[0] : p[size-1];
const QPointF vec2 = 0.5 * ( pn - p[size - 2] );
store.addCubic( p[size - 2] + vec1 * t[size-2].t1,
p[size - 1] - vec2 * t[size-2].t2, p[size - 1] );
if ( spline->isClosing() )
{
const QPointF vec3 = 0.5 * ( p[1] - p[size-1] );
store.addCubic( p[size-1] + vec2 * t[size-1].t1,
p[0] - vec3 * t[size-1].t2, p[0] );
}
return store;
}
void Renderer::drawMesh()
{
// render mesh as a wireframe
QPainter p(&mImage);
p.setRenderHint(QPainter::Antialiasing);
p.setPen(QPen(QBrush(mCfg.mesh.mMeshColor),0.5));
p.setFont(QFont(""));
const Mesh::Elements& elems = mMesh->elements();
for (int i=0; i < elems.count(); ++i)
{
const Element& elem = elems[i];
if( elem.isDummy() )
continue;
// If the element is outside the view of the canvas, skip it
if( elemOutsideView(i) )
continue;
QPolygonF pts = elementPolygonPixel(elem);
p.drawPolyline(pts.constData(), pts.size());
if (mCfg.mesh.mRenderMeshLabels)
{
double cx, cy;
mMesh->elementCentroid(i, cx, cy);
QString txt = QString::number(elem.id());
QRect bb = p.fontMetrics().boundingRect(txt);
QPointF xy = mtp.realToPixel(cx, cy);
bb.moveTo(xy.x() - bb.width()/2.0, xy.y() - bb.height()/2.0);
if (pts.containsPoint(bb.bottomLeft(), Qt::WindingFill) &&
pts.containsPoint(bb.bottomRight(), Qt::WindingFill) &&
pts.containsPoint(bb.topLeft(), Qt::WindingFill) &&
pts.containsPoint(bb.topRight(), Qt::WindingFill))
{
p.drawText(bb, Qt::AlignCenter, txt);
}
}
}
}
static inline QVector<QwtSplineCardinalG1::Tension> qwtTensions(
const QPolygonF &points, bool isClosed, Param param )
{
const int size = points.size();
QVector<QwtSplineCardinalG1::Tension> tensions2( isClosed ? size : size - 1 );
const QPointF *p = points.constData();
QwtSplineCardinalG1::Tension *t = tensions2.data();
const QPointF &p0 = isClosed ? p[size-1] : p[0];
double d13 = param(p[0], p[2]);
t[0] = qwtTension( param(p0, p[1]), param(p[0], p[1]),
d13, p0, p[0], p[1], p[2] );
for ( int i = 1; i < size - 2; i++ )
{
const double d23 = param( p[i], p[i+1] );
const double d24 = param( p[i], p[i+2] );
t[i] = qwtTension( d13, d23, d24, p[i-1], p[i], p[i+1], p[i+2] );
d13 = d24;
}
const QPointF &pn = isClosed ? p[0] : p[size-1];
const double d24 = param( p[size-2], pn );
t[size-2] = qwtTension( d13, param( p[size-2], p[size-1] ), d24,
p[size - 3], p[size - 2], p[size - 1], pn );
if ( isClosed )
{
const double d34 = param( p[size-1], p[0] );
const double d35 = param( p[size-1], p[1] );
t[size-1] = qwtTension( d24, d34, d35, p[size-2], p[size-1], p[0], p[1] );
}
return tensions2;
}
QPainterPath QwtSpline::pathP( const QPolygonF &points ) const
{
const int n = points.size();
QPainterPath path;
if ( n == 0 )
return path;
if ( n == 1 )
{
path.moveTo( points[0] );
return path;
}
if ( n == 2 )
{
path.addPolygon( points );
return path;
}
const QVector<QLineF> controlPoints = bezierControlPointsP( points );
if ( controlPoints.size() < n - 1 )
return path;
const QPointF *p = points.constData();
const QLineF *l = controlPoints.constData();
path.moveTo( p[0] );
for ( int i = 0; i < n - 1; i++ )
path.cubicTo( l[i].p1(), l[i].p2(), p[i+1] );
if ( controlPoints.size() >= n )
{
path.cubicTo( l[n-1].p1(), l[n-1].p2(), p[0] );
path.closeSubpath();
}
return path;
}
static SplineStore qwtSplinePathPleasing( const QPolygonF &points,
bool isClosed, Param param )
{
using namespace QwtSplinePleasingP;
const int size = points.size();
const QPointF *p = points.constData();
SplineStore store;
store.init( isClosed ? size : size - 1 );
store.start( p[0] );
double d13;
QPointF vec1;
if ( isClosed )
{
d13 = qwtChordalLength(p[0], p[2]);
const Tension t0 = qwtTensionPleasing(
qwtChordalLength( p[size-1], p[1]), qwtChordalLength(p[0], p[1]),
d13, p[size-1], p[0], p[1], p[2] );
const QPointF vec0 = qwtVectorCardinal<Param>( param, p[size-1], p[0], p[1] );
vec1 = qwtVectorCardinal<Param>( param, p[0], p[1], p[2] );
store.addCubic( p[0] + vec0 * t0.t1, p[1] - vec1 * t0.t2, p[1] );
}
else
{
d13 = qwtChordalLength(p[0], p[2]);
const Tension t0 = qwtTensionPleasing(
qwtChordalLength( p[0], p[1]), qwtChordalLength(p[0], p[1]),
d13, p[0], p[0], p[1], p[2] );
const QPointF vec0 = 0.5 * qwtVector<Param>( param, p[0], p[1] );
vec1 = qwtVectorCardinal<Param>( param, p[0], p[1], p[2] );
store.addCubic( p[0] + vec0 * t0.t1, p[1] - vec1 * t0.t2, p[1] );
}
for ( int i = 1; i < size - 2; i++ )
{
const double d23 = qwtChordalLength( p[i], p[i+1] );
const double d24 = qwtChordalLength( p[i], p[i+2] );
const QPointF vec2 = qwtVectorCardinal<Param>( param, p[i], p[i+1], p[i+2] );
const Tension t = qwtTensionPleasing(
d13, d23, d24, p[i-1], p[i], p[i+1], p[i+2] );
store.addCubic( p[i] + vec1 * t.t1, p[i+1] - vec2 * t.t2, p[i+1] );
d13 = d24;
vec1 = vec2;
}
if ( isClosed )
{
const double d24 = qwtChordalLength( p[size-2], p[0] );
const Tension tn = qwtTensionPleasing(
d13, qwtChordalLength( p[size-2], p[size-1] ), d24,
p[size-3], p[size-2], p[size-1], p[0] );
const QPointF vec2 = qwtVectorCardinal<Param>( param, p[size-2], p[size-1], p[0] );
store.addCubic( p[size-2] + vec1 * tn.t1, p[size-1] - vec2 * tn.t2, p[size-1] );
const double d34 = qwtChordalLength( p[size-1], p[0] );
const double d35 = qwtChordalLength( p[size-1], p[1] );
const Tension tc = qwtTensionPleasing( d24, d34, d35, p[size-2], p[size-1], p[0], p[1] );
const QPointF vec3 = qwtVectorCardinal<Param>( param, p[size-1], p[0], p[1] );
store.addCubic( p[size-1] + vec2 * tc.t1, p[0] - vec3 * tc.t2, p[0] );
}
else
{
const double d24 = qwtChordalLength( p[size-2], p[size-1] );
const Tension tn = qwtTensionPleasing(
d13, qwtChordalLength( p[size-2], p[size-1] ), d24,
p[size-3], p[size-2], p[size-1], p[size-1] );
const QPointF vec2 = 0.5 * qwtVector<Param>( param, p[size-2], p[size-1] );
store.addCubic( p[size-2] + vec1 * tn.t1, p[size-1] - vec2 * tn.t2, p[size-1] );
}
return store;
}
