org.PingOO.DLAI.lib.graph
Class RTextLine

java.lang.Object
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  +--org.PingOO.DLAI.lib.graph.TextLine
        |
        +--org.PingOO.DLAI.lib.graph.RTextLine

public class RTextLine

extends TextLine

This class is an extension of the TextLine Class that allows text to be rotated. To rotate the text the Component.createImage method is used. This means that this class needs to know the component that will receive the text. If the component is not known the text cannot be rotated and the class will fall back to the TextLine.draw method.

The text is rotated by running the image through an ImageFilter. This filter can easily be modified to rotate text through an arbitrary angle but unless the text is large the integer mapping will blur the text. Also positioning of arbitrarily rotated text becomes problematic.

Version:

$Revision: 1.5 $, $Date: 1996/10/23 03:13:45 $

Author:

Leigh Brookshaw

Inner Class Summary

protected class

RTextLine.RotateTextFilter This is an extension to the ImageFilter class that will rotate an image a multiple of 90 degrees.

Inner classes inherited from class org.PingOO.DLAI.lib.graph.TextLine

TextLine.TextState

Field Summary

protected int	angle Rotation Angle of text in degrees
private java.awt.Component	component
private double	cos
private double	sin

Fields inherited from class org.PingOO.DLAI.lib.graph.TextLine

ALGEBRAIC, ascent, background, CENTER, color, descent, font, fontname, fontsize, fontstyle, height, justification, leading, LEFT, lg, list, maxAscent, maxDescent, MINIMUM_SIZE, parse, RIGHT, SCIENTIFIC, script_fraction, sub_offset, sup_offset, text, width

Constructor Summary

RTextLine()
Instantiate the class

RTextLine(java.awt.Component c)
Instantiate the class.

RTextLine(java.awt.Font f, java.awt.Color c, int j)
Instantiate the class

RTextLine(java.awt.Font f, java.awt.Color c, int j, int a)
Instantiate the class

RTextLine(java.lang.String s)
Instantiate the class.

RTextLine(java.lang.String s, java.awt.Color c)
Instantiate the class

RTextLine(java.lang.String s, java.awt.Font f)
Instantiate the class

RTextLine(java.lang.String s, java.awt.Font f, java.awt.Color c, int j)
Instantiate the class

Method Summary

void	copyState(RTextLine t) Copy the state of the parsed Textline into the existing object.
void	draw(java.awt.Component comp, java.awt.Graphics g, int x, int y) Parse the text, rotate it then draw it to the screen.
void	draw(java.awt.Graphics g, int x, int y) Parse the text then draw it.
void	draw(java.awt.Graphics g, int x, int y, int j) Parse the text then draw it.
int	getBottomEdge(java.awt.Graphics g) Return the bottom edge of the rotated text.
int	getBottomEdge(java.awt.Graphics g, int j) Return the bottom edge of the rotated text.
java.awt.Component	getComponent()
int	getLeftEdge(java.awt.Graphics g) Return the left edge of the rotated text.
int	getLeftEdge(java.awt.Graphics g, int j) Return the left edge of the rotated text.
int	getRHeight(java.awt.Graphics g) The height of the text after it has been rotated.
int	getRightEdge(java.awt.Graphics g) Return the right edge of the rotated text.
int	getRightEdge(java.awt.Graphics g, int j) Return the right edge of the rotated text.
int	getRotation()
int	getRWidth(java.awt.Graphics g) The width of the text after it has been rotated.
int	getTopEdge(java.awt.Graphics g) Return the top edge of the rotated text.
int	getTopEdge(java.awt.Graphics g, int j) Return the top edge of the rotated text.
void	setDrawingComponent(java.awt.Component c) Set the Component the text will be drawn into.
void	setRotation(int angle) Set the text rotation angle.
void	setRotation(int angle, java.awt.Component c) Set the Rotation and the Component that will be drawn into

Methods inherited from class org.PingOO.DLAI.lib.graph.TextLine

charWidth, copyState, copyState, getAscent, getBackground, getColor, getDescent, getFM, getFont, getFontName, getFontSize, getFontStyle, getHeight, getJustification, getLeading, getMaxAscent, getMaxDescent, getScriptFont, getText, getWidth, isNull, parseDouble, parseDouble, parseDouble, parseText, rebuildFont, setBackground, setColor, setFont, setFontName, setFontSize, setFontStyle, setJustification, setText

Methods inherited from class java.lang.Object

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

Field Detail

angle

protected int angle

Rotation Angle of text in degrees

cos

private double cos

sin

private double sin

component

private java.awt.Component component

Constructor Detail

RTextLine

public RTextLine()

Instantiate the class

RTextLine

public RTextLine(java.lang.String s)

Instantiate the class.

Parameters:

s - String to parse.

RTextLine

public RTextLine(java.awt.Component c)

Instantiate the class.

Parameters:

c - the Component the text will be drawn into.

RTextLine

public RTextLine(java.lang.String s,
                 java.awt.Font f)

Instantiate the class

Parameters:

s - String to parse.

f - Font to use.

RTextLine

public RTextLine(java.lang.String s,
                 java.awt.Font f,
                 java.awt.Color c,
                 int j)

Instantiate the class

Parameters:

s - String to parse.

f - Font to use.

c - Color to use

j - Justification

RTextLine

public RTextLine(java.lang.String s,
                 java.awt.Color c)

Instantiate the class

Parameters:

s - String to parse.

c - Color to use

RTextLine

public RTextLine(java.awt.Font f,
                 java.awt.Color c,
                 int j,
                 int a)

Instantiate the class

Parameters:

f - Font to use.

c - Color to use

j - Justification

a - Rotation angle in degrees

RTextLine

public RTextLine(java.awt.Font f,
                 java.awt.Color c,
                 int j)

Instantiate the class

Parameters:

f - Font to use.

c - Color to use

j - Justification

Method Detail

copyState

public void copyState(RTextLine t)

Copy the state of the parsed Textline into the existing object.

Parameters:

t - The TextLine to get the state information from.

setRotation

public void setRotation(int angle)

Set the text rotation angle. Only multiples of 90 degrees are accepted

Parameters:

angle - The angle to rotate the text

setDrawingComponent

public void setDrawingComponent(java.awt.Component c)

Set the Component the text will be drawn into. This is required to rotate the text. if it is not set the text will not be rotated.

Parameters:

c - The drawing component

setRotation

public void setRotation(int angle,
                        java.awt.Component c)

Set the Rotation and the Component that will be drawn into

Parameters:

angle - The angle to rotate the text

c - The drawing component

getRotation

public int getRotation()

Returns:

the Rotation angle in degrees.

getComponent

public java.awt.Component getComponent()

Returns:

the Component that will receive the text.

getRWidth

public int getRWidth(java.awt.Graphics g)

The width of the text after it has been rotated.

Parameters:

g - Graphics context.

Returns:

the width of the parsed text after it has been rotated.

getRHeight

public int getRHeight(java.awt.Graphics g)

The height of the text after it has been rotated.

Parameters:

g - Graphics context.

Returns:

the height of the parsed text after it has been rotated.

getLeftEdge

public int getLeftEdge(java.awt.Graphics g)

Return the left edge of the rotated text. This is dependent on the justification of the text.

Parameters:

g - Graphics context.

Returns:

the Left edge of the rotated text

getRightEdge

public int getRightEdge(java.awt.Graphics g)

Return the right edge of the rotated text. This is dependent on the justification of the text.

Parameters:

g - Graphics context.

Returns:

the Right edge of the rotated text

getTopEdge

public int getTopEdge(java.awt.Graphics g)

Return the top edge of the rotated text. This is dependent on the justification of the text.

Parameters:

g - Graphics context.

Returns:

the Top edge of the rotated text

getBottomEdge

public int getBottomEdge(java.awt.Graphics g)

Return the bottom edge of the rotated text. This is dependent on the justification of the text.

Parameters:

g - Graphics context.

Returns:

the Bottom edge of the rotated text

getLeftEdge

public int getLeftEdge(java.awt.Graphics g,
                       int j)

Return the left edge of the rotated text.

Parameters:

g - Graphics context.

j - Text justification

Returns:

the Left edge of the rotated text

getRightEdge

public int getRightEdge(java.awt.Graphics g,
                        int j)

Return the right edge of the rotated text.

Parameters:

g - Graphics context.

j - Text justification

Returns:

the Right edge of the rotated text

getTopEdge

public int getTopEdge(java.awt.Graphics g,
                      int j)

Return the top edge of the rotated text.

Parameters:

g - Graphics context.

j - Text justification

Returns:

the Top edge of the rotated text

getBottomEdge

public int getBottomEdge(java.awt.Graphics g,
                         int j)

Return the bottom edge of the rotated text.

Parameters:

g - Graphics context.

j - Text justification

Returns:

the Bottom edge of the rotated text

draw

public void draw(java.awt.Graphics g,
                 int x,
                 int y)

Parse the text then draw it.

Parameters:

g - Graphics context

x - pixel position of the text

y - pixel position of the text

Overrides:

draw in class TextLine

draw

public void draw(java.awt.Graphics g,
                 int x,
                 int y,
                 int j)

Parse the text then draw it.

Parameters:

g - Graphics context

x - pixel position of the text

y - pixel position of the text

j - justification of the text

Overrides:

draw in class TextLine

draw

public void draw(java.awt.Component comp,
                 java.awt.Graphics g,
                 int x,
                 int y)

Parse the text, rotate it then draw it to the screen.

Parameters:

g - Graphics context

x - pixel position of the text

y - pixel position of the text