Qt第三方库QCustomPlot——QCustomPlot解读

这个小部件类，对于QCustomPlot的所有方面都有所体现

下面阅读它的函数：

函数组织顺序为: 基本设置---添加图线---删除图线---添加额外Item---层次管理---坐标轴管理----导出图表

QCustomPlot (QWidget *parent=0)

void     setViewport (const QRect &rect)//视口设置，通常就是本部件所在的长宽
void     setBackground (const QPixmap &pm)//在整个视口的最底层绘制图片，用作背景
void     setBackground (const QPixmap &pm, bool scaled, Qt::AspectRatioMode mode=Qt::KeepAspectRatioByExpanding)
void     setBackground (const QBrush &brush)
void     setBackgroundScaled (bool scaled)//设置setBackground 所绘的图是否进行缩放以适应Viewport
void     setBackgroundScaledMode (Qt::AspectRatioMode mode)//有Qt::IgnoreAspectRatio（忽略比例，缩放至适应视口），Qt::KeepAspectRatio（保持长宽比，直到一边最大至视口边缘）Qt::KeepAspectRatioByExpanding（保持长宽比，缩放至充满视口）
void     setAntialiasedElements (const QCP::AntialiasedElements &antialiasedElements)//抗锯齿效果，对于各对象，都有默认设置，可通过本函数，改变默认不抗锯齿的元素，使它也抗。
void     setAntialiasedElement (QCP::AntialiasedElement antialiasedElement, bool enabled=true)//更方便的开关
void     setNotAntialiasedElements (const QCP::AntialiasedElements ¬AntialiasedElements)//设置不抗
void     setNotAntialiasedElement (QCP::AntialiasedElement notAntialiasedElement, bool enabled=true)
void     setAutoAddPlottableToLegend (bool on)//是否自动添加图形到图例，默认是
void     setInteraction (const QCP::Interaction &interaction, bool enabled=true)//设置交互方式，如是否可拖动或缩放轴，是否可选中轴或图例等。
void     setInteractions (const QCP::Interactions &interactions)
void     setSelectionTolerance (int pixels)//选择公差设置，在多少像素中能选中某个元素
void     setNoAntialiasingOnDrag (bool enabled)//拖动时是否也抗锯齿
void     setPlottingHint (QCP::PlottingHint hint, bool enabled=true)//设置其它参数，如快速绘制线（损失质量），缓存轴的lable(提高效率)
void     setPlottingHints (const QCP::PlottingHints &hints)
void     setMultiSelectModifier (Qt::KeyboardModifier modifier)//要多选时的按键，默认Qt::ControlModifier，即ctrl

QRect     viewport () const//与上述大致对应
QPixmap     background () const
bool     backgroundScaled () const
Qt::AspectRatioMode     backgroundScaledMode () const
QCPLayoutGrid *     plotLayout () const
QCP::AntialiasedElements     antialiasedElements () const
QCP::AntialiasedElements     notAntialiasedElements () const
bool     autoAddPlottableToLegend () const
const QCP::Interactions     interactions () const
int     selectionTolerance () const
bool     noAntialiasingOnDrag () const
QCP::PlottingHints     plottingHints () const
Qt::KeyboardModifier     multiSelectModifier () const

QCPAbstractPlottable *     plottable (int index)//所有添加的图线都自动加了索引，按先后顺序
QCPAbstractPlottable *     plottable ()
bool     addPlottable (QCPAbstractPlottable *plottable)//添加除graph线外的其它种类型的曲线或图
bool     removePlottable (QCPAbstractPlottable *plottable)
bool     removePlottable (int index)
int     clearPlottables ()
int     plottableCount () const
QList< QCPAbstractPlottable * >     selectedPlottables () const//返回选中的线
QCPAbstractPlottable *     plottableAt (const QPointF &pos, bool onlySelectable=false) const//返回某个点是否有图线
bool     hasPlottable (QCPAbstractPlottable *plottable) const

QCPGraph *     addGraph (QCPAxis *keyAxis=0, QCPAxis *valueAxis=0)//为Graph线留的特殊接口，因Graph是最常用的
bool     removeGraph (QCPGraph *graph)
bool     removeGraph (int index)
QCPGraph *     graph (int index) const
QCPGraph *     graph () const
int     clearGraphs ()
int     graphCount () const
QList< QCPGraph * >     selectedGraphs () const

bool     addItem (QCPAbstractItem *item)//添加一些附加item，如箭头等
bool     removeItem (QCPAbstractItem *item)
bool     removeItem (int index)
int     clearItems ()
int     itemCount () const
QCPAbstractItem *     item (int index) const
QCPAbstractItem *     item () const
QList< QCPAbstractItem * >     selectedItems () const
QCPAbstractItem *     itemAt (const QPointF &pos, bool onlySelectable=false) const
bool     hasItem (QCPAbstractItem *item) const
QCPLayoutElement *     layoutElementAt (const QPointF &pos) const

QCPLayer *     layer (const QString &name) const//QCustomPlot分层的实现与管理
QCPLayer *     layer (int index) const
QCPLayer *     currentLayer () const
bool     setCurrentLayer (const QString &name)
bool     setCurrentLayer (QCPLayer *layer)
int     layerCount () const
bool     addLayer (const QString &name, QCPLayer *otherLayer=0, LayerInsertMode insertMode=limAbove)
bool     removeLayer (QCPLayer *layer)
bool     moveLayer (QCPLayer *layer, QCPLayer *otherLayer, LayerInsertMode insertMode=limAbove)

QCPAxisRect *     axisRect (int index=0) const
QList< QCPAxisRect * >     axisRects () const
QList< QCPAxis * >     selectedAxes () const
QList< QCPLegend * >     selectedLegends () const
int     axisRectCount () const

bool     savePdf (const QString &fileName, bool noCosmeticPen=false, int width=0, int height=0, const QString &pdfCreator="", const QString &pdfTitle="")//将图表导出成各种格式
bool     savePng (const QString &fileName, int width=0, int height=0, double scale=1.0, int quality=-1)
bool     saveJpg (const QString &fileName, int width=0, int height=0, double scale=1.0, int quality=-1)
bool     saveBmp (const QString &fileName, int width=0, int height=0, double scale=1.0)
bool     saveRastered (const QString &fileName, int width, int height, double scale, const char *format, int quality=-1)
QPixmap     toPixmap (int width=0, int height=0, double scale=1.0)
void     toPainter (QCPPainter *painter, int width=0, int height=0)

//三个槽
Q_SLOT void     replot (QCustomPlot::RefreshPriority refreshPriority=QCustomPlot::rpHint)//重新生成图表
Q_SLOT void     rescaleAxes (bool onlyVisiblePlottables=false)
Q_SLOT void     deselectAll ()//取消选择