Constructor Detail

• Mapper

  Mapper(RrdGraphDef gdef,
         ImageParameters im)

  Creates a new mapper for the specified graph definition and image parameters.

  Parameters:

  gdef - the graph definition containing scaling information

  im - the image parameters with dimensions and ranges

Method Detail

• xtr

  int xtr(double mytime)

  Converts time coordinate to pixel x-coordinate.

  Parameters:

  mytime - timestamp in seconds

  Returns:

  x pixel position

• ytr

  int ytr(double value)

  Converts value coordinate to pixel y-coordinate. Handles both linear and logarithmic scaling with rigid bounds.

  Parameters:

  value - data value to convert

  Returns:

  y pixel position