152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
#include "graphicsItem/electricSvgItem.h"
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#include "graphicsItem/itemControlHandle.h"
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#include <QPainter>
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#include <QStyleOption>
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#include <QSvgRenderer>
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#include <QDebug>
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ElectricSvgItem::ElectricSvgItem(const QRect &rect, QGraphicsItem *parent)
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: GraphicsBaseItem(parent),m_pRender(nullptr)
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{
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m_lastBoudingRect = rect;
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m_boundingRect = rect;
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m_dWidth = rect.width();
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m_dHeight = rect.height();
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}
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ElectricSvgItem::~ElectricSvgItem()
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{
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}
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QPainterPath ElectricSvgItem::shape()
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{
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QPainterPath path;
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double dHandleX = 0.0;
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double dHandleY = 0.0;
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path.addRect(m_boundingRect);
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return path;
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}
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void ElectricSvgItem::updateCoordinate() //当执行了resie和editShape函数后，boundingRect发生了变换，需要将item的原点(以中心点为原点)校准至boundingRect.center()
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{
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if (!parentItem())
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{
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QPointF pt1, pt2, delta;
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pt1 = mapToScene(QPointF(0, 0));
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pt2 = mapToScene(m_boundingRect.center());
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delta = pt1 - pt2;
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prepareGeometryChange();
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//将boundingRect设置成中心点和原点（也是默认变换原点），这样三点重合，有助于简化计算
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m_boundingRect = QRectF(-m_dWidth / 2, -m_dHeight / 2, m_dWidth, m_dHeight);
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//setTransformOriginPoint(m_boundingRect.center()); //变换中心默认为item的(0,0)点，所以不执行这句话也没有问题
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//更新bouondingRect后重回会显示位置会有变化，需要做对应的移动
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moveBy(-delta.x(), -delta.y());
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updateHandles();
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}
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m_lastBoudingRect = m_boundingRect;
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}
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void ElectricSvgItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
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{
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if(m_pRender)
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{
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m_pRender->render(painter,m_boundingRect);
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}
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painter->setPen(m_pen);
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painter->setBrush(m_brush);
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if(m_state == S_lineOut)
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{
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painter->setPen(QPen(QColor(255,51,153,180)));
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painter->drawLine(m_beginConnectPoint,m_endConnectPoint);
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}
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if (option->state & QStyle::State_Selected) //是选中状态,绘制选中框
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{
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int nPenWidth = 1;
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painter->setPen(QPen(QColor(135,206,235,180))); //蓝色的外框
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painter->setBrush(QBrush(QColor(135,206,235,180)));
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double dx = m_boundingRect_selected.x();
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double dy = m_boundingRect_selected.y();
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double dWidth = m_boundingRect_selected.width();
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double dHeight = m_boundingRect_selected.height();
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//画弧线0度是3点钟方向
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if(dWidth > dHeight)
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{
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painter->drawRect(m_boundingRect_selected);
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painter->drawChord(dx-dHeight*0.5,dy,dHeight,dHeight,90*16,180*16);
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painter->drawChord(dx+dWidth-dHeight*0.5,dy,dHeight,dHeight,(-90)*16,180*16);
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}
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else if(dWidth < dHeight)
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{
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painter->drawRect(m_boundingRect_selected);
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painter->drawChord(dx,dy-dWidth*0.5,dWidth,dWidth,0*16,180*16);
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painter->drawChord(dx,dy+dHeight-dWidth*0.5,dWidth,dWidth,180*16,180*16);
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//painter->drawChord(dx+dWidth-dHeight*0.5,dy,dHeight,dHeight,(-90)*16,180*16);
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}
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else
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{
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painter->drawEllipse(QPointF(dx+dWidth*0.5,dy+dHeight*0.5),dHeight*0.5,dHeight*0.5);
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}
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//绘制变换原点
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QPointF originPoint = transformOriginPoint();
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//qDebug() << "originPoint:" << originPoint;
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painter->setBrush(Qt::red);
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painter->drawEllipse(originPoint, 4, 4);
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}
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}
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void ElectricSvgItem::loadSvg(const QString& str)
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{
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m_pRender = new QSvgRenderer(str);
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}
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void ElectricSvgItem::resize(int nHandle,double dSX, double dSY, const QPointF& basePoint)
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{
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switch (nHandle)
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{
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case H_left:
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case H_right:
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dSY = 1; //拖拽的是左点右点，为水平缩放，忽略垂直变化
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break;
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case H_top:
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case H_bottom:
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dSX = 1; //拖拽的是顶点底点，为垂直缩放，忽略水平变化
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break;
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default:
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break;
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}
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QTransform trans;
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//缩放是以图元原点（中心）位置为基准，所以每帧都先移动移动到想要的基准点，缩放之后再移回
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trans.translate(basePoint.x(), basePoint.y());
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trans.scale(dSX, dSY);
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trans.translate(-basePoint.x(), -basePoint.y());
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prepareGeometryChange();
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m_boundingRect = trans.mapRect(m_lastBoudingRect);
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m_dWidth = m_boundingRect.width();
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m_dHeight = m_boundingRect.height();
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updateHandles();
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}
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void ElectricSvgItem::move(const QPointF& point)
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{
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moveBy(point.x(), point.y());
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}
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void ElectricSvgItem::editShape(int nHandle,const QPointF& ptMouse)
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{
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prepareGeometryChange();
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updateHandles();
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}
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