edu.hws.jcm.draw
Class DrawString

java.lang.Object
  |
  +--edu.hws.jcm.draw.Drawable
        |
        +--edu.hws.jcm.draw.DrawString

All Implemented Interfaces:

Computable, java.io.Serializable

public class DrawString

extends Drawable

implements Computable

A DrawString object displays a string, possibly multi-line, in a DisplayCanvas, inside the rectangular region of a CoordinateRect. The location of the string can be specified in two ways. First, by giving the coordinates of a reference point together with a constant that says how the string is positioned with respect to that reference point. The coordintes are given as Value objects and the values are interepreted in the coordinate system of the CoordinateRect. The positioning object is one of the constants TOP_LEFT, TOP_CENTER, ..., BOTTOM_RIGHT defined in this class. This says where the REFERENCE POINT is -- at the top left of the string, at the top center, etc.

The second way to specify the position of the string is to set the reference point coordinates to null. In that case, the postioning constant gives the location of the STRING in the CorrdinateRect. A value of TOP_LEFT says that the string is in the top left corner of the rect, etc.

An array of Value objects can be specified to be displayed in the string. Their values are substituted for #'s in the string. (A double # in the string, however, is displayed as a literal single #.)

It is possible to set the color, font and justification of the string.

A DisplayString implements the Computable interface, so it can be added to a Controller. The values of the Value objects used by the string are recomputed only when its compute() method is called.

See Also:

Serialized Form

Field Summary

protected java.awt.Color	backgroundColor If backgroundColor is non-null, then a rectangle of this color is filled as a background for the string;
protected java.lang.String	baseString String, possibly with \n and #'s.
static int	BOTTOM_CENTER Specify string location in rect
static int	BOTTOM_LEFT Specify string location in rect
static int	BOTTOM_RIGHT Specify string location in rect
static int	CENTER For specifying justification of lines in multiline strings.
static int	CENTER_CENTER Specify string location in rect
static int	CENTER_LEFT Specify string location in rect
static int	CENTER_RIGHT Specify string location in rect
protected boolean	clamp If true, the string is clamped to lie within the CoordinateRect.
protected java.awt.Color	color Color of string.
protected java.awt.Font	font Font for drawing string.
protected java.awt.Color	frameColor If frameWidth is greate than zero, then a frame is drawn around the string in this color.
protected int	frameWidth If frameWidth is greater than zero, then a frame of this width is drawn around the string in the color given by frameColor.
protected int	justification Left, right, or center justification of lines in the text.
static int	LEFT For specifying justification of lines in multiline strings.
protected int	numSize Maximum number of characters desired in numbers; actual number might actually be larger.
protected int	offset If absolute positioning is used, then this gives a gap between the string and edge of rect.
protected int	position one of the constants defined in this class for specifying position
static int	RIGHT For specifying justification of lines in multiline strings.
protected java.lang.String[]	strings The actual lines to draw, derived from baseString.
static int	TOP_CENTER Specify string location in rect
static int	TOP_LEFT Specify string location in rect
static int	TOP_RIGHT Specify string location in rect
protected Value[]	values Values to be substituted for #'s in the baseString.
protected Value	xPos xy-coords for drawing the string.
protected Value	yPos xy-coords for drawing the string.

Fields inherited from class edu.hws.jcm.draw.Drawable

canvas, coords

Constructor Summary

DrawString()
Create a DrawString object that initially has no string to draw.

DrawString(java.lang.String str)
Create a DrawString for drawing a black string in the top left corner of the coordinate rect.

DrawString(java.lang.String str, int pos)
Create a DrawString for drawing a black string in the position specified.

DrawString(java.lang.String str, int pos, Value[] values)
Create a DrawString for drawing a black string in the specified position.

DrawString(java.lang.String str, int pos, Value xPos, Value yPos, Value[] values)
Create a string that is displayed at the reference point (xPos,yPos); The positioning constant, pos, gives the positioning relative to this point, if xPos or yPos is non-null.

Method Summary

void	compute() The compute method sets up the array of strings that is actually displayed.
void	draw(java.awt.Graphics g, boolean coordsChanged) Draws the string.
java.awt.Color	getBackgroundColor() Get the color that is used to fill a rectangle on which the string is drawn.
boolean	getClamp() Returns true if the string is set to be clamped to lie within the CoordinateRect.
java.awt.Color	getColor() Get the non-null color that is used for drawing the string.
java.awt.Font	getFont() Return the font that is used for drawing the string.
java.awt.Color	getFrameColor() Get the color that is used to draw a frame around the string.
int	getFrameWidth() Get the width, in pixels, of the frame that is drawn around the string.
int	getJustification() Get the justification that is used for a multiple-line string.
int	getNumSize() Return the desired maximum number of characters in displayed numbers.
int	getOffset() Get the distance of the bounding box of the string from the reference point where it is drawn.
int	getPositioning() Return the positioning, as set by setPositioning().
java.lang.String	getString() Get a copy of the display string (with \n's #'s, not with substitued values.)
Value[]	getValues() Return the array of values that are substituted for #'s in the string.
Value	getXPos() Return the Value object that gives the x-coordinate of the reference point of this string.
Value	getYPos() Return the Value object that gives the y-coordinate of the reference point of this string.point of this string.
void	setBackgroundColor(java.awt.Color color) Set the color that is used to fill a rectangle on which the string is drawn.
void	setClamp(boolean clamp) Set the "clamp" property of the DrawString.
void	setColor(java.awt.Color c) Set the color for the string.
void	setFont(java.awt.Font f) Set the font that is used for drawing this string.
void	setFrameColor(java.awt.Color color) Set the color that is used to draw a frame around the string.
void	setFrameWidth(int width) Set the width, in pixels, of a frame to draw around the string.
void	setJustification(int j) Set the justification to be used if there are multiple lins in the string.
void	setNumSize(int size) Set the desired maximum number of characters in displayed numbers.
void	setOffset(int b) Set the distance of the bounding box of the string from the reference point where it is drawn.
void	setPositioning(int pos) Set the positioning of the string.
void	setReferencePoint(Value x, Value y) Set the values of the (x,y) coordinates of the reference point for the stirng.
void	setString(java.lang.String str) Set the string that is displayed.
void	setValues(Value[] v) Set the Values that are substituted for (single) #'s in the string.

Methods inherited from class edu.hws.jcm.draw.Drawable

getVisible, needsRedraw, setOwnerData, setVisible

Methods inherited from class java.lang.Object

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

Field Detail

TOP_LEFT

public static final int TOP_LEFT

Specify string location in rect

TOP_CENTER

public static final int TOP_CENTER

Specify string location in rect

TOP_RIGHT

public static final int TOP_RIGHT

Specify string location in rect

CENTER_LEFT

public static final int CENTER_LEFT

Specify string location in rect

CENTER_CENTER

public static final int CENTER_CENTER

Specify string location in rect

CENTER_RIGHT

public static final int CENTER_RIGHT

Specify string location in rect

BOTTOM_LEFT

public static final int BOTTOM_LEFT

Specify string location in rect

BOTTOM_CENTER

public static final int BOTTOM_CENTER

Specify string location in rect

BOTTOM_RIGHT

public static final int BOTTOM_RIGHT

Specify string location in rect

CENTER

public static final int CENTER

For specifying justification of lines in multiline strings. (But can also be used as a synonym for CENTER_CENTER to specify the position of the string).

LEFT

public static final int LEFT

For specifying justification of lines in multiline strings. (But can also be used as a synonym for TOP_LEFT to specify the position of the string).

RIGHT

public static final int RIGHT

For specifying justification of lines in multiline strings. (But can also be used as a synonym for TOP_RIGHT to specify the position of the string).

position

protected int position

one of the constants defined in this class for specifying position

baseString

protected java.lang.String baseString

String, possibly with \n and #'s. This is used as a base to get the actual string that is drawn.

strings

protected java.lang.String[] strings

The actual lines to draw, derived from baseString.

values

protected Value[] values

Values to be substituted for #'s in the baseString.

xPos

protected Value xPos

xy-coords for drawing the string. If non-null then relative positioning is used. If null, then positioning is absolute.

yPos

protected Value yPos

xy-coords for drawing the string. If non-null then relative positioning is used. If null, then positioning is absolute.

color

protected java.awt.Color color

Color of string. If null, black is used as the default.

font

protected java.awt.Font font

Font for drawing string. If null, get font from graphics context.

offset

protected int offset

If absolute positioning is used, then this gives a gap between the string and edge of rect. For relative positioning, this gives an offset from the value of xPos yPos.

clamp

protected boolean clamp

If true, the string is clamped to lie within the CoordinateRect.

justification

protected int justification

Left, right, or center justification of lines in the text.

numSize

protected int numSize

Maximum number of characters desired in numbers; actual number might actually be larger.

backgroundColor

protected java.awt.Color backgroundColor

If backgroundColor is non-null, then a rectangle of this color is filled as a background for the string;

frameWidth

protected int frameWidth

If frameWidth is greater than zero, then a frame of this width is drawn around the string in the color given by frameColor.

frameColor

protected java.awt.Color frameColor

If frameWidth is greate than zero, then a frame is drawn around the string in this color. If the value is null, then the color will be the same as the color of the string.

Constructor Detail

DrawString

public DrawString()

Create a DrawString object that initially has no string to draw.

DrawString

public DrawString(java.lang.String str)

Create a DrawString for drawing a black string in the top left corner of the coordinate rect.

Parameters:

str - The string to draw, which can contain \n's to indicate line breaks.

DrawString

public DrawString(java.lang.String str,
                  int pos)

Create a DrawString for drawing a black string in the position specified.

Parameters:

str - The string to draw, which can contain \n's to indicate line breaks.

pos - The positioning of the string in the coordinate rect. One of the positioning constants such as TOP_LEFT or BOTTOM_RIGHT.

DrawString

public DrawString(java.lang.String str,
                  int pos,
                  Value[] values)

Create a DrawString for drawing a black string in the specified position. The number of #'s in the string should match values.length. The values are computed and substituted for the #'s.

Parameters:

str - The string to draw, which can contain \n's to indicate line breaks and #'s to be replaced by numeric values.

pos - The positioning of the string in the coordinate rect. One of the positioning constants such as TOP_LEFT or BOTTOM_RIGHT.

values - Value objects associated with #'s in the string.

DrawString

public DrawString(java.lang.String str,
                  int pos,
                  Value xPos,
                  Value yPos,
                  Value[] values)

Create a string that is displayed at the reference point (xPos,yPos); The positioning constant, pos, gives the positioning relative to this point, if xPos or yPos is non-null.

Parameters:

str - The string to draw, which can contain \n's to indicate line breaks and #'s to be replaced by numeric values.

pos - The positioning of the string. One of the positioning constants such as TOP_LEFT or BOTTOM_RIGHT. If xPos or yPos is non-nul, this is interpreted relative to their values.

xPos - x-coordinate relative to which the string is drawn (or null for absolute hoizontal positioning).

yPos - y-coordinate relative to which the string is drawn (or null for absolute vertical positioning).

values - Value objects associated with #'s in the string.

Method Detail

setColor

public void setColor(java.awt.Color c)

Set the color for the string. If c is null, Color.black is used.

getColor

public java.awt.Color getColor()

Get the non-null color that is used for drawing the string.

setFont

public void setFont(java.awt.Font f)

Set the font that is used for drawing this string. If f is null, then the font is obtained from the Graphics context in which the string is drawn.

getFont

public java.awt.Font getFont()

Return the font that is used for drawing the string. If the return value is null, then the font is taken from the Graphics context.

setValues

public void setValues(Value[] v)

Set the Values that are substituted for (single) #'s in the string. If the array of Values is null, then no substitution is done. The length of the array should match the number of #'s, but it is not an error if they do not match. Extra values will be ignored; extra #'s will be shown as "undefined".

getValues

public Value[] getValues()

Return the array of values that are substituted for #'s in the string.

setPositioning

public void setPositioning(int pos)

Set the positioning of the string. The parameter should be one of the positioning contstants defined in this class, such as TOP_LEFT. (If it is not, TOP_LEFT is used by default.)

getPositioning

public int getPositioning()

Return the positioning, as set by setPositioning().

setReferencePoint

public void setReferencePoint(Value x,
                              Value y)

Set the values of the (x,y) coordinates of the reference point for the stirng. If a value is null, absolute positioning is used. If a value is undefined, the string is not drawn.

getXPos

public Value getXPos()

Return the Value object that gives the x-coordinate of the reference point of this string.

getYPos

public Value getYPos()

Return the Value object that gives the y-coordinate of the reference point of this string.point of this string.

setString

public void setString(java.lang.String str)

Set the string that is displayed. Note that it can include '\n' to represent a line break, and it can contain #'s which will be replaced by computed values.

getString

public java.lang.String getString()

Get a copy of the display string (with \n's #'s, not with substitued values.)

setOffset

public void setOffset(int b)

Set the distance of the bounding box of the string from the reference point where it is drawn. The default value is 3.

getOffset

public int getOffset()

Get the distance of the bounding box of the string from the reference point where it is drawn.

setClamp

public void setClamp(boolean clamp)

Set the "clamp" property of the DrawString. If set to true, the string will be clamped to lie entirely within the CoordinateRect (unless it doens't fit -- then it can stick out on the right and bottom). The default value is true.

getClamp

public boolean getClamp()

Returns true if the string is set to be clamped to lie within the CoordinateRect.

setJustification

public void setJustification(int j)

Set the justification to be used if there are multiple lins in the string. Possible value are DrawString.LEFT, DrawString.RIGHT, and DrawString.CENTER.

getJustification

public int getJustification()

Get the justification that is used for a multiple-line string. The value is one of the constants DrawString.LEFT, DrawString.RIGHT, or DrawString.CENTER

setNumSize

public void setNumSize(int size)

Set the desired maximum number of characters in displayed numbers. Actual size might be larger. Value is clamped to the range 6 to 25.

getNumSize

public int getNumSize()

Return the desired maximum number of characters in displayed numbers.

getBackgroundColor

public java.awt.Color getBackgroundColor()

Get the color that is used to fill a rectangle on which the string is drawn. Null indicates that no rectangle is filled so the stuff in back of the string shows though. The default value is null.

setBackgroundColor

public void setBackgroundColor(java.awt.Color color)

Set the color that is used to fill a rectangle on which the string is drawn. If the value is null, no rectangle is filled and the string just overlays whatever is in back of it on the canvas.

getFrameColor

public java.awt.Color getFrameColor()

Get the color that is used to draw a frame around the string. This is only done if the frameWidth property is greater than zero. If the value is null, the frame is the same color as the string.

setFrameColor

public void setFrameColor(java.awt.Color color)

Set the color that is used to draw a frame around the string. This is only done if the frameWidth property is greater than zero. If the value is null, the frame is the same color as the string.

getFrameWidth

public int getFrameWidth()

Get the width, in pixels, of the frame that is drawn around the string. The default width is zero. The largest possible value is 25.

setFrameWidth

public void setFrameWidth(int width)

Set the width, in pixels, of a frame to draw around the string. If the value is zero, no frame is drawn. The default value is zero. The the value is clamped to the range 0 to 25.

compute

public void compute()

The compute method sets up the array of strings that is actually displayed. This is required by the Computable interface and is usually called by a Controller rather than directly.

Specified by:

compute in interface Computable

draw

public void draw(java.awt.Graphics g,
                 boolean coordsChanged)

Draws the string.

Overrides:

draw in class Drawable

Following copied from class: edu.hws.jcm.draw.Drawable

Parameters:

g - The graphics context in which the Drawble is to be drawn. (The drawing can change the color in g, but should not permanently change font, painting mode, etc. Thus, every drawable is responsible for setting the color it wants to use.)

coordsChanged - Indicates whether the CoordinateRect has changed.