QVector<QPointF> vpf;
QPointF pfIn = QPointF(0,0);
QPointF pf = QPointF(-10,-10);
vpf.append(pf);
pf = QPointF(10,-10);
vpf.append(pf);
pf = QPointF(10,10);
vpf.append(pf);
pf = QPointF(-10,10);
vpf.append(pf);
QPolygonF pol(vpf);
qDebug()<<"pol:"<<pol;
if(pol.contains(pfIn))
{
qDebug()<<"pol contains ptIn";
}
if(pol.containsPoint(pfIn,Qt::WindingFill))
{
qDebug()<<"pol containsPoint ptIn WindingFill";
}
执行结果为，用containsPoint能判定到在区域内，而用contains则不行。
一般这种需求都是在mousepress函数内使用的，我的例程如下
void mygraphicCaliperitem::mousePressEvent(QGraphicsSceneMouseEvent *event)
```
```
{
```
```
QList<QGraphicsItem *> items = scene()->items();
```
```
for(int i = 0;i<items.count();i++)
```
```
{
```
```
((mygraphicCaliperitem*)items[i])->m_bSelected = false;
```
```
}
```
```
this->m_bSelected=true;
```
```
if(event->button()== Qt::LeftButton)
```
```
{
```
```
//setSelected(true);
```
```
m_startPos = event->pos();//鼠标左击时，获取当前鼠标在图片中的坐标，
```
```
if(m_ShapeType == CALIPER_RECT)//矩形卡尺
```
```
{
```
```
if(m_tCaliRect.m_RECT_Rotate_Pol.containsPoint(m_startPos,Qt::WindingFill))//旋转矩形
```
```
{
```
```
m_StateFlag = CALIPER_STATE_FLAG::CALI_RECT_ROTATE;
```
```
setCursor(Qt::PointingHandCursor);
```
```
}
```
```
else if(m_tCaliRect.m_RECT_BR_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_RECT_BR;//标记当前为用户按下矩形的右下角顶点矩形区域
```
```
setCursor(Qt::SizeAllCursor);
```
```
}
```
```
else if(m_tCaliRect.m_RECT_Shear_Pol.containsPoint(m_startPos,Qt::WindingFill))//在矩形内框区域时按下鼠标，则可拖动图片
```
```
{
```
```
m_StateFlag = CALIPER_STATE_FLAG::CALI_RECT_SHEAR;//标记当前为鼠标拖动图片移动状态
```
```
setCursor(Qt::PointingHandCursor); //改变光标形状,手指的形状
```
```
}
```
```
else if(m_tCaliRect.m_RECT_Inside_Pol.containsPoint(m_startPos,Qt::WindingFill))//在矩形内框区域时按下鼠标，则可拖动图片
```
```
{
```
```
m_StateFlag = CALIPER_STATE_FLAG::CALI_RECT_MOVE;//标记当前为鼠标拖动图片移动状态
```
```
setCursor(Qt::ClosedHandCursor); //改变光标形状,手的形状
```
```
}
```
```
else
```
```
{
```
```
m_StateFlag = CALI_DEFAULT;
```
```
}
```
```
}
```
```
else if(m_ShapeType == CALIPER_LINE)//直线卡尺
```
```
{
```
```
int nCount = m_tCaliRectLst.count();
```
```
for(int i=0;i<nCount;i++)
```
```
{
```
```
if((nCount+1)/2-1==i)//让中间那个矩形控制所有矩形的变换
```
```
{
```
```
if(m_tCaliRectLst[i].m_RECT_Rotate_Pol.containsPoint(m_startPos,Qt::WindingFill))//旋转矩形
```
```
{
```
```
m_StateFlag = CALIPER_STATE_FLAG::CALI_RECT_ROTATE;
```
```
setCursor(Qt::PointingHandCursor);
```
```
return;
```
```
}
```
```
else if(m_tCaliRectLst[i].m_RECT_BR_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_RECT_BR;//标记当前为用户按下矩形的右下角顶点矩形区域
```
```
setCursor(Qt::SizeAllCursor);
```
```
return;
```
```
}
```
```
else if(m_tCaliRectLst[i].m_RECT_Shear_Pol.containsPoint(m_startPos,Qt::WindingFill))//在矩形内框区域时按下鼠标，则可拖动图片
```
```
{
```
```
m_StateFlag = CALIPER_STATE_FLAG::CALI_RECT_SHEAR;//标记当前为切变状态
```
```
setCursor(Qt::PointingHandCursor); //改变光标形状,手指的形状
```
```
return;
```
```
}
```
```
}
```
```
}
```
```
if(m_LineBodyPol.containsPoint(m_startPos,Qt::WindingFill))//拖动直线
```
```
{
```
```
m_StateFlag = CALI_LINE_MOVE;//标记当前为直线卡尺的拖动
```
```
setCursor(Qt::ClosedHandCursor); //改变光标形状,手的形状
```
```
}
```
```
else if(m_LineP1Pol.containsPoint(m_startPos,Qt::WindingFill))//移动直线顶点1
```
```
{
```
```
m_StateFlag =CALI_LINE_PT1_MOVE;
```
```
setCursor(Qt::SizeAllCursor);//变换鼠标形状
```
```
}
```
```
else if(m_LineP2Pol.containsPoint(m_startPos,Qt::WindingFill))//移动直线顶点1
```
```
{
```
```
m_StateFlag =CALI_LINE_PT2_MOVE;
```
```
setCursor(Qt::SizeAllCursor);//变换鼠标形状
```
```
}
```
```
for(int i=0;i<nCount;i++)
```
```
{
```
```
if(m_tCaliRectLst[i].m_RECT_Inside_Pol.containsPoint(m_startPos,Qt::WindingFill))//在矩形内框区域时按下鼠标，则可拖动图片
```
```
{
```
```
m_StateFlag = CALI_LINE_MOVE;//标记当前为直线卡尺的拖动
```
```
setCursor(Qt::ClosedHandCursor); //改变光标形状,手的形状
```
```
}
```
```
}
```
```
}
```
```
else if(m_ShapeType == CALIPER_CIRCLE)
```
```
{
```
```
QPolygonF CirclePoly = QPolygonF(m_CircleRect);
```
```
QPolygonF FillCircleP1Poly = QPolygonF(m_FillCircleP1Rect);
```
```
QPolygonF FillCircleP3Poly = QPolygonF(m_FillCircleP3Rect);
```
```
int nCount = m_tCaliRectLst.count();
```
```
for(int i=0;i<nCount;i++)
```
```
{
```
```
if((nCount+1)/2-1==i)//让中间那个矩形控制所有矩形的变换
```
```
{
```
```
if(m_tCaliRectLst[i].m_RECT_BR_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_RECT_BR;//标记当前为用户按下矩形的右下角顶点矩形区域
```
```
setCursor(Qt::SizeAllCursor);
```
```
return;
```
```
}
```
```
}
```
```
}
```
```
if(m_CircleP1Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_PT1_MOVE;
```
```
setCursor(Qt::SizeAllCursor);//变换鼠标形状
```
```
return;
```
```
}
```
```
else if(m_CircleP2Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_PT2_MOVE;
```
```
setCursor(Qt::SizeAllCursor);//变换鼠标形状
```
```
return;
```
```
}
```
```
else if(m_CircleP3Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_PT3_MOVE;
```
```
setCursor(Qt::SizeAllCursor);//变换鼠标形状
```
```
return;
```
```
}
```
```
else if(FillCircleP1Poly.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_FillP1;
```
```
setCursor(Qt::PointingHandCursor);//变成手指形状
```
```
return;
```
```
}
```
```
else if(FillCircleP3Poly.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_FillP3;
```
```
setCursor(Qt::PointingHandCursor);//变成手指形状
```
```
return;
```
```
}
```
```
else if(CirclePoly.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_MOVE;
```
```
setCursor(Qt::ClosedHandCursor);//鼠标变成抓取的样式
```
```
return;
```
```
}
```
```
for(int i=0;i<nCount;i++)
```
```
{
```
```
if(m_tCaliRectLst[i].m_RECT_Inside_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CALI_CIRCLE_MOVE;//移动圆形卡尺
```
```
setCursor(Qt::ClosedHandCursor);
```
```
return;
```
```
}
```
```
}
```
```
}
```
```
else if(m_ShapeType == C_CIRCLE)//圆形
```
```
{
```
```
if(m_tCircle.m_RECT_BR_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CIRCLE_SCALE;
```
```
setCursor(Qt::SizeAllCursor);//鼠标变成上下左右箭头
```
```
return;
```
```
}
```
```
else if(m_tCircle.m_RECT_Pol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = CIRCLE_MOVE;
```
```
setCursor(Qt::ClosedHandCursor);
```
```
}
```
```
}
```
```
else if(m_ShapeType == C_ELLIPSE)//椭圆
```
```
{
```
```
if(m_tEllipse.m_RECT_Rotate_Pol.containsPoint(m_startPos,Qt::WindingFill))//旋转矩形
```
```
{
```
```
m_StateFlag = ELLIPSE_ROTATE;
```
```
setCursor(Qt::PointingHandCursor);
```
```
}
```
```
else if(m_tEllipse.m_leftPolygon.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = ELLIPSE_LEFT_MOVE;
```
```
setCursor(Qt::PointingHandCursor);//鼠标变成上下左右箭头
```
```
}
```
```
else if(m_tEllipse.m_topPolygon.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = ELLIPSE_TOP_MOVE;
```
```
setCursor(Qt::PointingHandCursor);//鼠标变成上下左右箭头
```
```
}
```
```
else if(m_tEllipse.m_rightPolygon.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = ELLIPSE_RIGHT_MOVE;
```
```
setCursor(Qt::PointingHandCursor);//鼠标变成上下左右箭头
```
```
}
```
```
else if(m_tEllipse.m_bottomPolygon.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = ELLIPSE_BOTTOM_MOVE;
```
```
setCursor(Qt::PointingHandCursor);//鼠标变成上下左右箭头
```
```
}
```
```
else if(m_tEllipse.m_RECT_Inside_Pol.containsPoint(m_startPos,Qt::WindingFill))//在矩形内框区域时按下鼠标，则可拖动图片
```
```
{
```
```
m_StateFlag = ELLIPSE_MOVE;//标记当前为鼠标拖动图片移动状态
```
```
setCursor(Qt::ClosedHandCursor); //改变光标形状,手的形状
```
```
}
```
```
else
```
```
{
```
```
m_StateFlag = CALI_DEFAULT;
```
```
}
```
```
}
```
```
else if(m_ShapeType==C_LINE)//直线
```
```
{
```
```
QPolygonF pol1 = QPolygonF(QRectF(m_Line.p1().x()-5,m_Line.p1().y()-5,10,10));
```
```
QPolygonF pol2 = QPolygonF(QRectF(m_Line.p2().x()-5,m_Line.p2().y()-5,10,10));
```
```
if(pol1.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = LINE_PT1_MOVE;
```
```
setCursor(Qt::SizeAllCursor);
```
```
}
```
```
else if(pol2.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = LINE_PT2_MOVE;
```
```
setCursor(Qt::SizeAllCursor);
```
```
}
```
```
else if(m_LinePol.containsPoint(m_startPos,Qt::WindingFill))
```
```
{
```
```
m_StateFlag = LINE_MOVE;
```
```
setCursor(Qt::SizeAllCursor);
```
```
}
```
```
}
```
```
else if(m_ShapeType == C_POLYGON)//多边形
```
```
{
```
```
m_nPolygonMovePointIndex = GetIndexOfMovePointInPolygon(m_startPos);
```
```
if(m_nPolygonMovePointIndex>-1 && m_nPolygonMovePointIndex<m_oldPolygon.count())
```
```
{
```
```
m_StateFlag = POLYGON_POINT_MOVE;//移动多边形的某个点
```
```
setCursor(Qt::PointingHandCursor);//设置鼠标形状
```
```
}
```
```
else if(m_oldPolygon.containsPoint(m_startPos,Qt::WindingFill))//如果在多边形内
```
```
{
```
```
m_StateFlag = POLYGON_MOVE;//移动多边形
```
```
setCursor(Qt::ClosedHandCursor); //改变光标形状,手的形状
```
```
}
```
```
}
```
```
else if(m_ShapeType== C_MASK)
```
```
{
```
```
if(m_bStartMask)
```
```
{
```
```
m_vPoints.clear();
```
```
m_vPoints.append(m_startPos);
```
```
}
```
```
}
```
```
}
```
```
else if(event->button()== Qt::RightButton)
```
```
{
```
```
m_startPos = event->pos();
```
```
if(m_ShapeType==C_POLYGON)
```
```
{
```
```
m_nPolyRemoveIndex = GetIndexOfMovePointInPolygon(m_startPos);
```
```
if(m_nPolyRemoveIndex>-1&&m_nPolyRemoveIndex<m_oldPolygon.count())//说明在顶点附近右击
```
```
{
```
```
//弹出的菜单只显示 删除顶点
```
```
pMenu->actions()[0]->setVisible(false);
```
```
pMenu->actions()[1]->setVisible(true);
```
```
pMenu->exec(event->screenPos());//弹出菜单
```
```
}
```
```
else//说明不在顶点附近右击，弹出的菜单只显示 增加顶点
```
```
{
```
```
m_MinDis = 9999999;
```
```
m_MapDis2Line.clear();
```
```
for(int i = 0;i<m_oldPolygon.count();i++)
```
```
{
```
```
QLineF line;
```
```
if(i<m_oldPolygon.count()-1)
```
```
{
```
```
line = QLineF(QPointF(m_oldPolygon[i]),QPointF(m_oldPolygon[i+1]));
```
```
}
```
```
else
```
```
{
```
```
line = QLineF(QPointF(m_oldPolygon[i]),QPointF(m_oldPolygon[0]));
```
```
}
```
```
qreal dis = CalDis(m_startPos.x(),m_startPos.y(),line.x1(),line.y1(),line.x2(),line.y2());
```
```
if(m_MinDis>dis)
```
```
m_MinDis = dis;//找到离那条线段距离最近距离
```
```
m_MapDis2Line.insert(dis,i);
```
```
}
```
```
pMenu->actions()[0]->setVisible(true);
```
```
pMenu->actions()[1]->setVisible(false);
```
```
pMenu->exec(event->screenPos());//弹出菜单 只显示增加顶点
```
```
}
```
```
```
```
}
```
```
}
```
```
else
```
```
{
```
```
QGraphicsItem::mousePressEvent(event);
```
```
}
```
```
scene()->update();
```
```
}
