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Add help line for assist alignement of element

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git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@3591 bfdf4180-ca20-0410-9c96-a3a8aa849046
This commit is contained in:
blacksun
2015-01-07 19:21:17 +00:00
parent 16e17438d2
commit ceb2b9bcfd
6 changed files with 242 additions and 28 deletions
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155
sources/qetgraphicsitem/terminal.cpp
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@@ -78,8 +78,10 @@ void Terminal::init(QPointF pf, Qet::Orientation o, QString number, QString name
*/
Terminal::Terminal(QPointF pf, Qet::Orientation o, Element *e) :
QGraphicsItem(e),
parent_element_(e),
hovered_color_(Terminal::neutralColor)
m_draw_help_line(false),
m_help_line (nullptr),
parent_element_ (e),
hovered_color_ (Terminal::neutralColor)
{
init(pf, o, "_", "_", false);
}
@@ -94,8 +96,10 @@ Terminal::Terminal(QPointF pf, Qet::Orientation o, Element *e) :
*/
Terminal::Terminal(qreal pf_x, qreal pf_y, Qet::Orientation o, Element *e) :
QGraphicsItem(e),
parent_element_(e),
hovered_color_(Terminal::neutralColor)
m_draw_help_line (false),
m_help_line (nullptr),
parent_element_ (e),
hovered_color_ (Terminal::neutralColor)
{
init(QPointF(pf_x, pf_y), o, "_", "_", false);
}
@@ -267,10 +271,91 @@ void Terminal::paint(QPainter *p, const QStyleOptionGraphicsItem *options, QWidg
p -> setRenderHint(QPainter::Antialiasing, true);
p -> drawEllipse(QRectF(c.x() - 2.5, c.y() - 2.5, 5.0, 5.0));
} else p -> drawPoint(c);
//Draw help line if needed, only if there isn't conductor
//docked to this terminal
if (m_draw_help_line && conductors().isEmpty())
{
if (!m_help_line)
m_help_line = new QGraphicsLineItem(this);
QLineF line(HelpLine());
Terminal *t = alignedWithTerminal();
if (t)
{
line.setP2(t -> dockConductor());
m_help_line -> setPen(QPen (Qt::darkGreen));
}
else
{
m_help_line -> setPen(QPen (Qt::darkBlue));
}
//Map the line (in scene coordinate) to help_line coordinate
line.setP1(m_help_line -> mapFromScene(line.p1()));
line.setP2(m_help_line -> mapFromScene(line.p2()));
m_help_line -> setLine(line);
}
p -> restore();
}
/**
* @brief Terminal::drawHelpLine
* @param draw : true, display the help line
* false, hide it.
*/
void Terminal::drawHelpLine(bool draw)
{
if (m_draw_help_line == draw) return;
m_draw_help_line = draw;
if (!draw && m_help_line)
{
delete m_help_line;
m_help_line = nullptr;
}
//update();
}
/**
* @brief Terminal::HelpLine
* @return a line with coordinate P1 the dock point of conductor
* and P2 the border of diagram, according to the orientation of terminal
* The line is in scene coordinate;
*/
QLineF Terminal::HelpLine() const
{
QPointF scene_dock = dockConductor();
QRectF rect = diagram() -> drawingRect();
QLineF line(scene_dock , QPointF());
//Set te second point of line to the edge of diagram,
//according with the orientation of this terminal
switch (orientation())
{
case Qet::North:
line.setP2(QPointF(scene_dock.x(), rect.top()));
break;
case Qet::East:
line.setP2(QPointF(rect.right() , scene_dock.y()));
break;
case Qet::South:
line.setP2(QPointF(scene_dock.x(), rect.bottom()));
break;
case Qet::West:
line.setP2(QPointF(rect.left(), scene_dock.y()));
break;
}
return line;
}
/**
@return Le rectangle (en precision flottante) delimitant la borne et ses alentours.
*/
@@ -289,6 +374,68 @@ QRectF Terminal::boundingRect() const {
return(*br_);
}
/**
* @brief Terminal::alignedWithTerminal
* If this terminal is aligned with an other terminal
* and is orientation is opposed return the other terminal
* else return nullptr
* @return
*/
Terminal* Terminal::alignedWithTerminal() const
{
QLineF line(HelpLine());
QPainterPath path;
path.moveTo(line.p1());
path.lineTo(line.p2());
//Get all QGraphicsItem in the alignement of this terminal
QList <QGraphicsItem *> qgi_list = diagram() -> items(path);
//Remove all terminals of the parent element
foreach (Terminal *t, parent_element_ -> terminals())
qgi_list.removeAll(t);
if (qgi_list.isEmpty()) return nullptr;
//Get terminals only if orientation is opposed with this terminal
QList <Terminal *> available_terminals;
foreach (QGraphicsItem *qgi, qgi_list)
{
if (Terminal *tt = qgraphicsitem_cast <Terminal *> (qgi))
{
//Call QET::lineContainsPoint to be sure the line intersect
//the dock point and not an other part of terminal
if (Qet::isOpposed(orientation(), tt -> orientation()) &&
QET::lineContainsPoint(line, tt -> dockConductor()))
{
available_terminals << tt;
}
}
}
if (available_terminals.isEmpty()) return nullptr;
if (available_terminals.size() == 1) return (available_terminals.first());
//Available_terminals have several terminals, we get the nearest terminal
line.setP2(available_terminals.first() -> dockConductor());
qreal current_lenght = line.length();
Terminal *nearest_terminal = available_terminals.takeFirst();
//Search the nearest terminal to this one
foreach (Terminal *terminal, available_terminals)
{
line.setP2(terminal -> dockConductor());
if (line.length() < current_lenght)
{
current_lenght = line.length();
nearest_terminal = terminal;
}
}
return nearest_terminal;
}
/**
Gere l'entree de la souris sur la zone de la Borne.
*/