Classi PlotFunction e MathFunction

Elenco delle funzioni con commenti estratto dagli header files.

File: plotfun.h - class PlotFunction

PlotFunction

Class representing a plottable function z=f(x,y). A plottable function has a rectangular domain minX <= x <= maxX, minY <= y <= maxY, and a number of rows and columns used to discretize the rectangular domain into a grid. There are functions returning the coordinates of a grid vertex given its indices (i,j) in the grid. This is an abstract class. The algorithm for computing f will be provided in the sub-classes.

Funzioni pubbliche:

• int setDomain(double x0, double y0, double x1, double y1);
  Set the domain limits, provided that x0<=x1 and y0<=y1, return 1 if parameters are ok, otherwise return 0 and do nothing. If parameters are ok also compute the limits of the function range.

• double getMinX(void)   double getMinY(void)
  double getMaxX(void)   double getMaxY(void)
  Return the domain limits.

• double getMinZ(void)   double getMaxZ(void)
  Return the limits of the function range (which have been computed based on the current grid).

• int setRowColNum(int r, int c);
  Set the number of rows and columns for domain discretization, provided that r>0 and c>0. Return 1 if parameters are ok, otherwise return 0 and do nothing. If parameters are ok also compute the limits of the function range.

• int getRowNum(void)   int getColNum(void)
  Return the number of rows and columns for domain discretization.

• double pointZ(double x, double y)
  double vertexZ(int i, int j)
  Abstract functions (not implemented here). Return the function value at a point (x,y) and at a vertex (i,j) of the grid, where i = row index and j = column index, i and j must be >=0 and <= numRow and numCol, respectively, otherwise a run-time error may occur.

• double gridEdgeX(void)   double gridEdgeY(void)
  Return the length of the grid edge on the x and y axis.

• double vertexX(int i, int j)   double vertexY(int i, int j)
  Return the x and y coordinates of vertex (i,j) of the grid, where i = row index and j = column index, i and j must be >=0 and <= numRow and numCol, respectively, otherwise a run-time error may occur.

File: mathfun.h - class MathFunction

MathFunction

Class representing a plottable function z=f(x,y) where f has an analytic expression. There is a pointer to a function returning the function value at a point (x,y) within the domain.

Public functions:

• MathFunction(void)
  Constructor, create a null function with domain = point (0,0) and discretized into 1 rows and 1 columns.

• void setFunction(double (*f) (double,double))
  Set the function, and also compute the limits of the function range based on the current grid.
  The argument is a function of type double f(double x, double y).

• double vertexZ(int i, int j) Implementation of the abstract function from superclass PlotFunction. Return the function value at a vertex (i,j) of the grid.

• double pointZ(double x, double y)
  Implementation of the abstract function from superclass. Return the function value at a point (x,y).