com.approximatrix.charting
Class Axis

java.lang.Object
  com.approximatrix.charting.Axis

public class Axis
extends java.lang.Object

The CoordSystem contains two or possibly three Axis objects for the x-axis and the at most two y-axis.

Version:

1.0

Author:

mueller

Field Summary

private int	align The axis' alignment.
(package private) ChartDataModelConstraints	constraints
static int	HORIZONTAL Defines a horizontal x-axis.
(package private) int	length
static int	LINEAR Defines a linear scale.
static int	LOGARITHMIC Defines a logarithmic scale.
static int	VERTICAL Defines a vertical y-axis.

Constructor Summary

Axis(int align, ChartDataModelConstraints c)
Creates new Axis.

Method Summary

int	getAlignment() Returns the alignment of the axis.
int	getLength() Returns length of the axis in pixels.
double	getPixelForValue(double value) Returns the point on the axis for a specific value.
double	getPointToPixelRatio() Returns the ratio between a value unit and the screen pixels.
void	setLength(int length) Sets the Pixel length of the axis.

Methods inherited from class java.lang.Object

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

Field Detail

HORIZONTAL

public static final int HORIZONTAL

Defines a horizontal x-axis.

See Also:

Constant Field Values

VERTICAL

public static final int VERTICAL

Defines a vertical y-axis.

See Also:

Constant Field Values

LOGARITHMIC

public static final int LOGARITHMIC

Defines a logarithmic scale.

See Also:

Constant Field Values

LINEAR

public static final int LINEAR

Defines a linear scale.

See Also:

Constant Field Values

align

private int align

The axis' alignment.

constraints

ChartDataModelConstraints constraints

length

int length

Constructor Detail

Axis

public Axis(int align,
            ChartDataModelConstraints c)

Creates new Axis.

Parameters:

align - the alignment of the axis.

c - the ChartDataModelConstraints

Method Detail

getAlignment

public int getAlignment()

Returns the alignment of the axis.

Returns:

the alignment constant: Axis.VERTICAL or Axis.HORIZONTAL

setLength

public void setLength(int length)

Sets the Pixel length of the axis.

Parameters:

length - the length in pixel

getLength

public int getLength()

Returns length of the axis in pixels.

Returns:

the length in pixels

getPixelForValue

public double getPixelForValue(double value)

Returns the point on the axis for a specific value. If the axis is a x-axis and the column values are not numeric, this isn't needed since then the axis can be divided into equally long parts. This is a relative pixel distance to the starting pixel of the axis.

Parameters:

value - the double value to compute the pixel distance for

Returns:

the pixel distance for the given value relative to the start of the axis

getPointToPixelRatio

public double getPointToPixelRatio()

Returns the ratio between a value unit and the screen pixels. This is only useful for linear scales.

Returns:

the ratio points / pixel length for the axis.