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#include "tikzscene.h"
#include <QPen>
#include <QBrush>
TikzScene::TikzScene(Graph *graph, QObject *parent) :
QGraphicsScene(parent), _graph(graph)
{
}
Graph *TikzScene::graph() const
{
return _graph;
}
void TikzScene::setGraph(Graph *graph)
{
_graph = graph;
graphReplaced();
}
void TikzScene::graphReplaced()
{
foreach (NodeItem *ni, nodeItems) {
removeItem(ni);
delete ni;
}
nodeItems.clear();
QPen blackPen(Qt::black);
QBrush redBrush(Qt::red);
foreach (Node *n, _graph->nodes()) {
NodeItem *ni = new NodeItem(n);
nodeItems << ni;
addItem(ni);
}
}
void TikzScene::drawBackground(QPainter *painter, const QRectF &rect)
{
// draw the grid
int step = 10;
QPen pen;
pen.setWidth(2);
pen.setCosmetic(true);
pen.setColor(QColor(245,245,255));
painter->setPen(pen);
for (int x = step; x < rect.right(); x += step) {
if (x % (step * 8) != 0) {
painter->drawLine(x, rect.top(), x, rect.bottom());
painter->drawLine(-x, rect.top(), -x, rect.bottom());
}
}
for (int y = step; y < rect.bottom(); y += step) {
if (y % (step * 8) != 0) {
painter->drawLine(rect.left(), y, rect.right(), y);
painter->drawLine(rect.left(), -y, rect.right(), -y);
}
}
pen.setColor(QColor(240,240,245));
painter->setPen(pen);
for (int x = step*8; x < rect.right(); x += step*8) {
painter->drawLine(x, rect.top(), x, rect.bottom());
painter->drawLine(-x, rect.top(), -x, rect.bottom());
}
for (int y = step*8; y < rect.bottom(); y += step*8) {
painter->drawLine(rect.left(), y, rect.right(), y);
painter->drawLine(rect.left(), -y, rect.right(), -y);
}
pen.setColor(QColor(230,230,240));
painter->setPen(pen);
painter->drawLine(rect.left(), 0, rect.right(), 0);
painter->drawLine(0, rect.top(), 0, rect.bottom());
}
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