bool Clipping::clip(Object* obj){
switch(obj->getType()){
case ObjType::OBJECT:
break;
case ObjType::POINT:
return clipPoint(obj->getNCoord(0));
case ObjType::LINE:
return clipLine(obj->getNCoord(0), obj->getNCoord(1));
case ObjType::POLYGON:
return clipPolygon(obj);
case ObjType::BEZIER_CURVE:
case ObjType::BSPLINE_CURVE:
return clipCurve(obj);
case ObjType::OBJECT3D:{
Object3D *obj3d = (Object3D*) obj;
bool draw = false;
for(auto &face : obj3d->getFaceList()){
bool tmp = clipPolygon(&face);
if(!tmp){ face.getNCoords().clear(); }
draw |= tmp;
}
return draw;
}case ObjType::BEZIER_SURFACE:
case ObjType::BSPLINE_SURFACE:{
Surface *surf = (Surface*) obj;
bool draw = false;
for(auto &curve : surf->getCurveList()){
bool tmp = clipCurve(&curve);
if(!tmp){ curve.getNCoords().clear(); }
draw |= tmp;
}
return draw;
}}
return false;
}
GeoDataDocument *VectorClipper::clipTo(const GeoDataLatLonBox &tileBoundary, int zoomLevel)
{
bool const useBaseClipper = false;
if (useBaseClipper) {
return clipToBaseClipper(tileBoundary);
}
bool const filterSmallAreas = zoomLevel > 10 && zoomLevel < 17;
GeoDataDocument* tile = new GeoDataDocument();
auto const clip = clipPath(tileBoundary, zoomLevel);
GeoDataLinearRing ring;
ring << GeoDataCoordinates(tileBoundary.west(), tileBoundary.north());
ring << GeoDataCoordinates(tileBoundary.east(), tileBoundary.north());
ring << GeoDataCoordinates(tileBoundary.east(), tileBoundary.south());
ring << GeoDataCoordinates(tileBoundary.west(), tileBoundary.south());
qreal const minArea = filterSmallAreas ? 0.01 * area(ring) : 0.0;
foreach (GeoDataPlacemark const * placemark, potentialIntersections(tileBoundary)) {
GeoDataGeometry const * const geometry = placemark ? placemark->geometry() : nullptr;
if (geometry && tileBoundary.intersects(geometry->latLonAltBox())) {
if(geometry->nodeType() == GeoDataTypes::GeoDataPolygonType) {
clipPolygon(placemark, clip, minArea, tile);
} else if (geometry->nodeType() == GeoDataTypes::GeoDataLineStringType) {
clipString<GeoDataLineString>(placemark, clip, minArea, tile);
} else if (geometry->nodeType() == GeoDataTypes::GeoDataLinearRingType) {
clipString<GeoDataLinearRing>(placemark, clip, minArea, tile);
} else {
tile->append(new GeoDataPlacemark(*placemark));
}
}
}
bool Clipping::clip(Object* obj){
switch(obj->getType()){
case ObjType::POINT:
return clipPoint(obj->getNCoord(0));
case ObjType::LINE:
return clipLine(obj->getNCoord(0), obj->getNCoord(1));
case ObjType::POLYGON:
return clipPolygon(obj);
case ObjType::BEZIER_CURVE:
return clipCurve(obj);
default:
return false;
}
}
// A succession of move and vector is gathered in a single polygon
// to make drawing faster
void QtGnuplotScene::flushCurrentPolygon()
{
if (m_currentPolygon.size() < 2) {
m_currentPolygon.clear();
return;
}
clipPolygon(m_currentPolygon);
QPainterPath path;
path.addPolygon(m_currentPolygon);
QGraphicsPathItem *pathItem;
pathItem = addPath(path, m_currentPen, Qt::NoBrush);
pathItem->setZValue(m_currentZ++);
m_currentPolygon.clear();
if (!m_inKeySample)
m_currentGroup.append(pathItem);
}
// A succession of move and vector is gathered in a single polygon
// to make drawing faster
void QtGnuplotScene::flushCurrentPolygon()
{
if (m_currentPolygon.size() < 2) {
m_currentPolygon.clear();
return;
}
clipPolygon(m_currentPolygon);
if (!m_inKeySample)
m_currentPointsItem->addPolygon(m_currentPolygon, m_currentPen);
else
{
flushCurrentPointsItem();
// Including the polygon in a path is necessary to avoid closing the polygon
QPainterPath path;
path.addPolygon(m_currentPolygon);
QGraphicsPathItem *pathItem;
pathItem = addPath(path, m_currentPen, Qt::NoBrush);
pathItem->setZValue(m_currentZ++);
}
m_currentPolygon.clear();
}
void display( void ) {
glClear( GL_COLOR_BUFFER_BIT );
/*
** Begin by drawing all the clip regions in black
** using a solid line of width 1
*/
glColor3f( 0.0, 0.0, 0.0 );
glLineStipple( 1, 0xffff );
glLineWidth( 1.0 );
print_poly( 4, clip1 );
print_poly( 4, clip2 );
/*
** For each polygon, print the polygon before and after
** clipping in a polygon-specific color; print the original
** using a dotted line of width 2, and the clipped using a
** solid line of width 3
*/
/*
** first polygon: entirely within region
*/
wl = 0;
glColor3f( 1.0, 0.0, 0.0 ); /* red */
glLineStipple( 1, 0x0f0f ); glLineWidth( 2.0 );
print_poly( 4, quad1 );
clipPolygon( 4, quad1, &wl, w,
clip1[0][0], clip1[0][1], clip1[2][0], clip1[2][1] );
glLineStipple( 1, 0xffff ); glLineWidth( 3.0 );
print_poly( wl, w );
/*
** second polygon: entirely outside region
*/
wl = 0;
glColor3f( 0.0, 1.0, 0.0 ); /* green */
glLineStipple( 1, 0x0f0f ); glLineWidth( 2.0 );
print_poly( 4, quad2 );
clipPolygon( 4, quad2, &wl, w,
clip1[0][0], clip1[0][1], clip1[2][0], clip1[2][1] );
/* shouldn't draw anything! */
if( wl > 0 ) {
glLineStipple( 1, 0xffff ); glLineWidth( 3.0 );
print_poly( wl, w );
}
/*
** third polygon: triangle, one point outside region
*/
wl = 0;
glColor3f( 0.0, 1.0, 1.0 ); /* cyan */
glLineStipple( 1, 0x0f0f ); glLineWidth( 2.0 );
print_poly( 3, tri1 );
clipPolygon( 3, tri1, &wl, w,
clip2[0][0], clip2[0][1], clip2[2][0], clip2[2][1] );
glLineStipple( 1, 0xffff ); glLineWidth( 3.0 );
print_poly( wl, w );
/*
** fourth polygon: part outside on right
*/
wl = 0;
glColor3f( 1.0, 0.0, 1.0 ); /* magenta */
glLineStipple( 1, 0x0f0f ); glLineWidth( 2.0 );
print_poly( 4, quad4 );
clipPolygon( 4, quad4, &wl, w,
clip1[0][0], clip1[0][1], clip1[2][0], clip1[2][1] );
glLineStipple( 1, 0xffff ); glLineWidth( 3.0 );
print_poly( wl, w );
/*
** fifth polygon: halfway outside on left
*/
wl = 0;
glColor3f( 0.0, 0.0, 1.0 ); /* blue */
glLineStipple( 1, 0x0f0f ); glLineWidth( 2.0 );
print_poly( 4, quad3 );
clipPolygon( 4, quad3, &wl, w,
clip2[0][0], clip2[0][1], clip2[2][0], clip2[2][1] );
glLineStipple( 1, 0xffff ); glLineWidth( 3.0 );
print_poly( wl, w );
/*
** Ensure that everything is displayed
*/
glFlush();
}
void display( void ) {
int i;
/*
* Clear window
*/
glClearColor( 1.0, 1.0, 1.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT );
/*
* Set the viewWindow
*/
glMatrixMode( GL_PROJECTION );
glLoadIdentity( );
gluOrtho2D( 0, 300, 0, 300 );
/*
* Set the viewport to match the viewWindow
*/
glViewport( 0, 0, 299, 299 );
/*
* first polygon: entirely within region
*/
wl = 0;
clipPolygon( 4, quad1x, quad1y, &wl, wx, wy, 10, 10, 50, 50 );
glColor3f( 1.0, 0.0, 0.0 ); /* red */
print_loop( 4, quad1x, quad1y );
print_poly( wl, wx, wy );
/*
* second polygon: entirely outside region
*/
wl = 0;
clipPolygon( 4, quad2x, quad2y, &wl, wx, wy, 10, 10, 50, 50 );
/* shouldn't draw anything! */
if( wl > 0 ) {
glColor3f( 0.0, 1.0, 0.0 ); /* green */
print_loop( 4, quad2x, quad2y );
print_poly( wl, wx, wy );
}
/*
* third polygon: halfway outside on left
*/
wl = 0;
clipPolygon( 4, quad3x, quad3y, &wl, wx, wy, 30, 10, 70, 80 );
glColor3f( 0.0, 0.0, 1.0 ); /* blue */
print_loop( 4, quad3x, quad3y );
print_poly( wl, wx, wy );
/*
* fourth polygon: part outside on right
*/
wl = 0;
clipPolygon( 4, quad4x, quad4y, &wl, wx, wy, 10, 10, 50, 50 );
glColor3f( 1.0, 0.0, 1.0 ); /* magenta */
print_loop( 4, quad4x, quad4y );
print_poly( wl, wx, wy );
/*
* fifth polygon: enclosing
*/
wl = 0;
clipPolygon( 5, pent1x, pent1y, &wl, wx, wy, 90, 20, 100, 30 );
glColor3f( 0.5, 0.5, 1.0 ); /* reddish-greenish-blue ? */
print_loop( 5, pent1x, pent1y );
print_poly( wl, wx, wy );
/*
* sixth polygon: outside on left and bottom
*/
wl = 0;
clipPolygon( 5, pent1x, pent1y, &wl, wx, wy, 90, 34, 120, 60 );
glColor3f( 1.0, 0.5, 1.0 ); /* red-greenish-blue ? */
print_loop( 5, pent1x, pent1y );
print_poly( wl, wx, wy );
/*
* seventh polygon: outside on top, right, and bottom
*/
wl = 0;
clipPolygon( 7, hept1x, hept1y, &wl, wx, wy, 90, 80, 130, 110 );
glColor3f( 0.0, 0.0, 0.0 ); /* black */
print_loop( 7, hept1x, hept1y );
print_poly( wl, wx, wy );
/*
* Flushs OpenGL commands to display
*/
glFlush();
}
