org.rrd4j.graph

Class Mapper

java.lang.Object

org.rrd4j.graph.Mapper

class Mapper
extends Object

Maps data coordinates to pixel coordinates for RRD graph rendering. Handles conversion between time/value coordinates and screen pixel positions.

Constructor Summary

Constructors

Constructor and Description
Mapper(RrdGraphDef gdef, ImageParameters im) Creates a new mapper for the specified graph definition and image parameters.

Method Summary

Modifier and Type	Method and Description
(package private) int	xtr(double mytime) Converts time coordinate to pixel x-coordinate.
(package private) int	ytr(double value) Converts value coordinate to pixel y-coordinate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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