void CPlotData::setLimits()
{
if(lines.size() == 0 || badData)
{
return;
}
QList<line_t>::const_iterator line = lines.begin();
if(line == lines.end()) return;
QPolygonF::const_iterator p = line->points.begin();
xmin = p->x();
xmax = p->x();
ymin = p->y();
ymax = p->y();
while(line != lines.end())
{
QPolygonF::const_iterator p = line->points.begin();
while(p != line->points.end())
{
if(p->x() > xmax) xmax = p->x();
if(p->x() < xmin) xmin = p->x();
if(p->y() > ymax) ymax = p->y();
if(p->y() < ymin) ymin = p->y();
++p;
}
++line;
}
xaxis->setLimits(xmin,xmax);
yaxis->setLimits(ymin,ymax);
}
void QgsMarkerLineSymbolLayerV2::renderPolylineCentral( const QPolygonF& points, QgsSymbolV2RenderContext& context )
{
if ( points.size() > 0 )
{
// calc length
qreal length = 0;
QPolygonF::const_iterator it = points.constBegin();
QPointF last = *it;
for ( ++it; it != points.constEnd(); ++it )
{
length += sqrt(( last.x() - it->x() ) * ( last.x() - it->x() ) +
( last.y() - it->y() ) * ( last.y() - it->y() ) );
last = *it;
}
// find the segment where the central point lies
it = points.constBegin();
last = *it;
qreal last_at = 0, next_at = 0;
QPointF next;
int segment = 0;
for ( ++it; it != points.constEnd(); ++it )
{
next = *it;
next_at += sqrt(( last.x() - it->x() ) * ( last.x() - it->x() ) +
( last.y() - it->y() ) * ( last.y() - it->y() ) );
if ( next_at >= length / 2 )
break; // we have reached the center
last = *it;
last_at = next_at;
segment++;
}
// find out the central point on segment
MyLine l( last, next ); // for line angle
qreal k = ( length * 0.5 - last_at ) / ( next_at - last_at );
QPointF pt = last + ( next - last ) * k;
// draw the marker
double origAngle = mMarker->angle();
if ( mRotateMarker )
mMarker->setAngle( origAngle + l.angle() * 180 / M_PI );
mMarker->renderPoint( pt, context.feature(), context.renderContext(), -1, context.selected() );
if ( mRotateMarker )
mMarker->setAngle( origAngle );
}
}
void
ViewerGL::Implementation::drawCheckerboardTexture(const QPolygonF& polygon)
{
///We divide by 2 the tiles count because one texture is 4 tiles actually
QPointF topLeft, btmRight;
double screenW, screenH;
{
QMutexLocker l(&zoomCtxMutex);
topLeft = zoomCtx.toZoomCoordinates(0, 0);
screenW = zoomCtx.screenWidth();
screenH = zoomCtx.screenHeight();
btmRight = zoomCtx.toZoomCoordinates(screenW - 1, screenH - 1);
}
double xTilesCountF = screenW / (checkerboardTileSize * 4); //< 4 because the texture contains 4 tiles
double yTilesCountF = screenH / (checkerboardTileSize * 4);
GLuint savedTexture;
GL_GPU::glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&savedTexture);
{
GLProtectAttrib<GL_GPU> a(GL_ENABLE_BIT);
GL_GPU::glEnable(GL_TEXTURE_2D);
GL_GPU::glBindTexture(GL_TEXTURE_2D, checkerboardTextureID);
GL_GPU::glBegin(GL_POLYGON);
for (QPolygonF::const_iterator it = polygon.begin();
it != polygon.end();
++it) {
GL_GPU::glTexCoord2d( xTilesCountF * ( it->x() - topLeft.x() ) / ( btmRight.x() - topLeft.x() ),
yTilesCountF * ( it->y() - btmRight.y() ) / ( topLeft.y() - btmRight.y() ) );
GL_GPU::glVertex2d( it->x(), it->y() );
}
GL_GPU::glEnd();
//glDisable(GL_SCISSOR_TEST);
} // GLProtectAttrib a(GL_SCISSOR_BIT | GL_ENABLE_BIT);
GL_GPU::glBindTexture(GL_TEXTURE_2D, savedTexture);
glCheckError(GL_GPU);
}