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Class figPac.fEnv

java.lang.Object
   |
   +----figPac.fEnv

public class fEnv

extends Object

implements fElement, fInteractive, ItemListener

Name:		bgColor        
Type of value:	Color       
Default value:	Color.white         
Significance:	Screen background color

Name:		fgColor
Type of value:	Color       
Default value:	Color.black         
Significance:	Screen foreground color

Name:		fillColor
Type of value:	Color       
Default value:	Color.black         
Significance:	Color used to fill polygons etc on screen

Name:		arrowHeadColor
Type of value:	Color       
Default value:	Color.black         
Significance:	Color used to fill arrowheads on screen

Name:		psFillGray
Type of value:	Double       
Default value:	0         
Significance:	Controls density of fill for polygons etc. in postscript  (0=black, 1=white)

Name:		useColorPs
Type of value:	String       
Default value:	false         
Significance:	Determines whether colour or grayscale fill is used in PostScript

Name:		arrowHeadGray
Type of value:	Double       
Default value:	0         
Significance:	Controls density of fill for arrowheads in postscript 

Name:		headHalfWidth
Type of value:	Double       
Default value:	2         
Significance:	Half the width of arrowheads in points 

Name:		headLength
Type of value:	Double       
Default value:	6         
Significance:	Length of arrowheads in points 

Name:		lineWidth
Type of value:	Double       
Default value:	0
Significance:	Width of lines drawn in points

Name:		font
Type of value:	Font       
Default value:	Font("Lucidasanstypewriter",Font.PLAIN, 14)         
Significance:	The font used by labels on the screen
                                 
Name:		psFont
Type of value:	String       
Default value:	"Helvetica 10"          
Significance:	The font and font size (in points) used in postscript labels. 

key

keys

A list of standard keys.

value

fEnv()

fEnv(Object, double)

Puts an Double wrapper on the value and then creates the pair (key, Double(value) ).

fEnv(Object, int)

Puts an Integer wrapper on the value and then creates the pair (key, Integer(value) ) or, if key is known to be of type double, (key, Double(value) ).

fEnv(Object, Object)

Creates the pair (key,value).

configure(String, double)

configure(String, double[])

configure(String, String)

drawgfx(Figure, Hashtable, V2V)

Inserts the pair (key,value) into the hash table env.

drawps(Figure, Hashtable, V2V)

Inserts the pair (key,value) into the hash table env.

endEdit()

endEditAndDelete()

itemStateChanged(ItemEvent)

startEdit(figEdit)

toColor(String)

Converts a String to a Color.

toDouble(String)

toFont(String)

toString()

 public Object key

 public Object value

 public String keys[]

A list of standard keys.

 public fEnv()

 public fEnv(Object key,
             Object value)

Creates the pair (key,value).

 public fEnv(Object key,
             int value)

Puts an Integer wrapper on the value and then creates the pair (key, Integer(value) ) or, if key is known to be of type double, (key, Double(value) ). Entries in hash tables must be objects (i.e. classes) not primitive data types. Java has built in a class, called Integer, to mirror the primitive data type int.

 public fEnv(Object key,
             double value)

Puts an Double wrapper on the value and then creates the pair (key, Double(value) ). Entries in hash tables must be objects (i.e. classes) not primitive data types. Java has built in a class, called Double, to mirror the primitive data type double.

 public void drawgfx(Figure fig,
                     Hashtable env,
                     V2V usr2pxl)

Inserts the pair (key,value) into the hash table env. Where appropriate, it also tells the Graphics controller gfx of the Figure fig to change its drawing environment. Here is are three typical statements that are extracting values from the table env

Color fillColor = (Color)( env.get("fillColor") );
double lineWidth = ((Double)( env.get("lineWidth") )).doubleValue();
int arrowMode = ((Integer)( env.get("arrowMode") )).intValue();

The output of env.get() is always of class Object (the superclass of all classes in Java). It has to be cast to whatever class the value is really supposed to represent. That is the role of (Color) in the first example and (Double) in the second. The method doubleValue() in the second example converts the object of class Double to the primitive data type double, that you actually want to compute with. Similarly, The method intValue() in the third example converts the object of class Integer to the primitive data type int.

 public String drawps(Figure fig,
                      Hashtable env,
                      V2V usr2ps)

Inserts the pair (key,value) into the hash table env. Where appropriate, it also returns the string of postscript that makes the corresponding change in the postscript drawing environment.

 public void startEdit(figEdit applet)

 public void endEdit()

 public void endEditAndDelete()

 public void configure(String name,
                       String Value)

 public void configure(String name,
                       double Value)

 public void configure(String name,
                       double Value[])

 public Color toColor(String color)

Converts a String to a Color. If the string is not a standard color (e.g. black) and is not a sequence of three integers in the range 0-255 (e.g. 20 0 255) and is not of the standard java form (e.g. java.awt.Color[r=30,g=40,b=50]) Color.white is returned.

 public Font toFont(String font)

 public Double toDouble(String number)

 public void itemStateChanged(ItemEvent e)

 public String toString()

Overrides:

toString in class Object

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