void LegendMarker::drawVector(QPainter *p, int x, int y, int l, int curveIndex) const
{
Graph *g = (Graph *)d_plot->parent();
if (!g)
return;
VectorCurve *v = (VectorCurve*)g->curve(curveIndex);
if (!v)
return;
p->save();
QPen pen(v->color(), v->width(), Qt::SolidLine);
p->setPen(pen);
QwtPainter::drawLine(p, x, y, x + l, y);
p->translate(x+l, y);
double pi=4*atan(-1.0);
int headLength = v->headLength();
int d=qRound(headLength*tan(pi*(double)v->headAngle()/180.0));
QPolygon endArray(3);
endArray[0] = QPoint(0, 0);
endArray[1] = QPoint(-headLength, d);
endArray[2] = QPoint(-headLength, -d);
if (v->filledArrowHead())
p->setBrush(QBrush(pen.color(), Qt::SolidPattern));
QwtPainter::drawPolygon(p,endArray);
p->restore();
}
void LegendWidget::drawVector(PlotCurve *c, QPainter *p, int x, int y, int l)
{
if (!c)
return;
VectorCurve *v = (VectorCurve*)c;
p->save();
if (d_plot->antialiasing())
p->setRenderHints(QPainter::Antialiasing);
QPen pen(v->color(), v->width(), Qt::SolidLine);
p->setPen(pen);
p->drawLine(x, y, x + l, y);
p->translate(x + l, y);
double pi=4*atan(-1.0);
int headLength = v->headLength();
int d=qRound(headLength*tan(pi*(double)v->headAngle()/180.0));
QPolygon endArray(3);
endArray[0] = QPoint(0, 0);
endArray[1] = QPoint(-headLength, d);
endArray[2] = QPoint(-headLength, -d);
if (v->filledArrowHead())
p->setBrush(QBrush(pen.color(), Qt::SolidPattern));
p->drawPolygon(endArray);
p->restore();
}
