void GraphicsItemEdge::paint(QPainter * painter, const QStyleOptionGraphicsItem *, QWidget *)
{
double edgeWidth = g_settings->edgeWidth;
QColor penColour;
if (isSelected())
penColour = g_settings->selectionColour;
else
penColour = g_settings->edgeColour;
QPen edgePen(QBrush(penColour), edgeWidth, Qt::SolidLine, Qt::RoundCap);
painter->setPen(edgePen);
painter->drawPath(path());
}
// Construct a view showing problem/solution from the given input stream.
View::View(std::istream &in, Options options, QGraphicsScene *scene, QWidget *parent) :
QGraphicsView(scene, parent),
m_legPen(Qt::black, 1.0),
m_currentLegPen(QColor(Qt::green).darker(), 1.0),
m_currentLeg(0),
m_hudFont("Courier", 10),
m_labelFont("Courier", 6),
m_solutionLength(0),
m_options(options)
{
resize(900, 600);
setRenderHints(QPainter::Antialiasing);
setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
setDragMode(QGraphicsView::ScrollHandDrag);
setViewportUpdateMode(QGraphicsView::FullViewportUpdate); // :(
setBackgroundBrush(Qt::white);
m_legPen.setCosmetic(true);
m_currentLegPen.setCosmetic(true);
// Read points.
int numPoints;
in >> numPoints;
m_points.resize(numPoints);
float minX = std::numeric_limits<float>::max();
float minY = std::numeric_limits<float>::max();
float maxX = std::numeric_limits<float>::lowest();
float maxY = std::numeric_limits<float>::lowest();
double sumX = 0;
double sumY = 0;
for (int i = 0; i < numPoints; ++i) {
float x, y;
in >> x >> y;
m_points[i].setX(x);
m_points[i].setY(y);
minX = qMin(minX, x);
minY = qMin(minY, y);
maxX = qMax(maxX, x);
maxY = qMax(maxY, y);
sumX += x;
sumY += y;
Vertex *item;
if (numPoints < 100) {
// If we have less than 100 vertices, we label them.
item = new Vertex(x, y, 8, i, Vertex::ShowLabel);
} else {
// We just draw them as dots.
item = new Vertex(x, y, 2, i, Vertex::NoLabel);
}
scene->addItem(item);
item->setZValue(1); // On top of edges.
}
if (m_options & CompleteGraph) {
// Add the complete set of edges.
QPen edgePen(Qt::gray);
edgePen.setCosmetic(true);
for (int i = 0; i < numPoints; ++i) {
for (int j = 0; j < numPoints; ++j) {
if (i == j)
continue;
float x1 = m_points[i].x();
float y1 = m_points[i].y();
float x2 = m_points[j].x();
float y2 = m_points[j].y();
QGraphicsLineItem *edgeItem = scene->addLine(x1, y1, x2, y2, edgePen);
m_edges.append(edgeItem);
if (m_options & ShowLengths) {
addLengthLabel(x1, y1, x2, y2);
}
}
}
}
// Read solution, if any.
if (m_options & PointPairs) {
readPointPairs(in);
} else {
readPointSequence(in);
}
// Center view on mean coordinate and zoom to fit entire scene.
const float margin = qAbs(maxX - minX) / 30;
setSceneRect(minX - margin, minY - margin, maxX - minX + 2*margin, maxY - minY + 2*margin);
centerOn(QPointF(sumX / numPoints, sumY / numPoints));
fitInView(sceneRect(), Qt::KeepAspectRatio);
}