randsburg
Class GraphMethods

java.lang.Object
  |
  +--randsburg.GraphMethods

public class GraphMethods

extends java.lang.Object

static methods for graph classes

Field Summary

static int	HIGH
static int	HORIZONTAL
static int	LOW
static int	VERTICAL

Constructor Summary

GraphMethods()

Method Summary

static float[]	findGrid(double lowValue, double highValue, int graphPixels) Find good grid values for scales and grid lines
static void	paintScale(java.awt.Graphics g, GraphInfo gi, int direction, boolean labelAxes) static method to paint a reasonable scale on a graph grid should be found be a call to findGrid above
static void	paintVerticalGrid(java.awt.Graphics g, double[] scaledVGrid, int offsetLeft, int graphWidth, java.awt.Color gridColor) Before using the grid to paint a vertical grid, need to scale locally
protected static int	scale(double value, double lowValue, double highValue, int direction, int offset, int graphSize)
static int	setMaxFractionDigits(double max, double min) try to determine a reasonable number of decimal places to show in labels

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

See Also:

Constant Field Values

VERTICAL

public static final int VERTICAL

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Constant Field Values

LOW

public static final int LOW

See Also:

Constant Field Values

HIGH

public static final int HIGH

See Also:

Constant Field Values

Constructor Detail

GraphMethods

public GraphMethods()

Method Detail

setMaxFractionDigits

public static int setMaxFractionDigits(double max,
                                       double min)

try to determine a reasonable number of decimal places to show in labels

findGrid

public static float[] findGrid(double lowValue,
                               double highValue,
                               int graphPixels)

Find good grid values for scales and grid lines

Parameters:

lowValue - The lower endpoint of the scale

highValue - iThe upper endpoint of the scale

graphPixels - The dimension of the scale in pixel space

Returns:

an array of floats to draw the grid at

paintVerticalGrid

public static void paintVerticalGrid(java.awt.Graphics g,
                                     double[] scaledVGrid,
                                     int offsetLeft,
                                     int graphWidth,
                                     java.awt.Color gridColor)

Before using the grid to paint a vertical grid, need to scale locally

paintScale

public static void paintScale(java.awt.Graphics g,
                              GraphInfo gi,
                              int direction,
                              boolean labelAxes)

static method to paint a reasonable scale on a graph grid should be found be a call to findGrid above

Parameters:

g - the Graphics object of the graph

gi - GraphInfo object

direction - one of VERTICAL or HORIZONTAL

labelAxes - whether to label axes

scale

protected static int scale(double value,
                           double lowValue,
                           double highValue,
                           int direction,
                           int offset,
                           int graphSize)