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line.cpp
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line.cpp
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#include "line.h"
#include <QSGGeometry>
#include <QSGGeometryNode>
#include <QSGFlatColorMaterial>
Line::Line()
{
setFlag(QQuickItem::ItemHasContents, true);
m_relativeX = 0;
m_relativeY = 0;
}
QSGNode *Line::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
QSGGeometryNode *node = nullptr;
QSGGeometry *geometry = nullptr;
if (!oldNode) {
node = new QSGGeometryNode;
geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
geometry->setLineWidth(1);
geometry->setDrawingMode(QSGGeometry::DrawLineStrip);
node->setGeometry(geometry);
node->setFlag(QSGNode::OwnsGeometry);
auto *material = new QSGFlatColorMaterial;
material->setColor(QColor(0, 0, 0));
node->setMaterial(material);
node->setFlag(QSGNode::OwnsMaterial);
} else {
node = static_cast<QSGGeometryNode *>(oldNode);
geometry = node->geometry();
geometry->allocate(2);
}
QSGGeometry::Point2D *vertices = geometry->vertexDataAsPoint2D();
vertices[0].set(0, 0);
vertices[1].set(relativeX(), relativeY());
node->markDirty(QSGNode::DirtyGeometry);
setScenePos(mapToScene(position()));
return node;
}
float Line::relativeX() const
{
return m_relativeX;
}
void Line::setRelativeX(float newRelativeX)
{
if (qFuzzyCompare(m_relativeX, newRelativeX)) {
return;
}
m_relativeX = newRelativeX;
emit relativeXChanged();
update();
}
float Line::relativeY() const
{
return m_relativeY;
}
void Line::setRelativeY(float newRelativeY)
{
if (qFuzzyCompare(m_relativeY, newRelativeY)) {
return;
}
m_relativeY = newRelativeY;
emit relativeYChanged();
update();
}
QPointF Line::scenePos() const
{
return m_scenePos;
}
void Line::setScenePos(QPointF newScenePos)
{
if (m_scenePos == newScenePos) {
return;
}
m_scenePos = newScenePos;
emit scenePosChanged();
}