_click _initialize addShape backStep cancel click draw dynshape gatherShapes getLastSnappedOriginPoint getLastSnappedPoint getMaxStep getShape getShapeType getSnappedType getStep ignoreStartPoint initialize isDrawingCommand isStepPointAccepted longPress m_flags m_lastSnapped m_shape m_step MgCommandDraw mouseHover setStep setStepPoint snapOptionsForStep snapPoint snapPoint snapPoint snapPointWidhOptions touchBegan touchBeganStep touchEnded touchEndedStep touchMoved touchMovedStep ~MgCommandDraw

backStep() bool MgCommandDraw::backStep ( const MgMotion *  sender ) virtual 回退一步 实现了 MgCommand. 被 MgCmdDrawLines, MgCmdDrawSplines, MgCmdDrawLine, MgCmdDrawFreeLines , 以及 MgCmdDrawRect 重载. 函数调用图: 这是这个函数的调用关系图: