Embedding FrAid
Introduction
Qutie a few languages nowadays allow Java to be used in an interactive scripting environment. These include Groovy, BeanShell, Jython to name just a few. Here is how you can use FrAid from such an environment (the examples are tested with Groovy but they should run on any of the listed above languages or Java itself).
Note
Some of the mentioned scripting environments use custom class loaders which have problem loading FrAid if the installation contains
more than one jar file. If you get any such errors use the single jar FrAid installation.
Uses
| Comment: | Plot a function: | Execute a function: | FrAid script required: |
|---|---|---|---|
| Execute it as a FrAid script |
import org.fraid.Scripting
s = new Scripting()
s.exec("plot(sin);")
Result:
|
print new org.fraid.Scripting().exec("sin(2);")
Result: (0.9092974268256817 - 0.0i) |
Yes |
| Pass a subclass of ComplexFunction |
import org.fraid.graphics.functions.*
import org.fraid.complex.functions.*
new plot().exec(sin)
Result:
|
Result: |
No |
| Pass a instance of a subclass of ComplexFunction |
import org.fraid.graphics.functions.*
import org.fraid.complex.functions.*
new plot().exec(new sin())
Result:
|
import org.fraid.complex.functions.*
print new sin().exec(2)
Result: (0.9092974268256817 - 0.0i) |
No |
| Get it from the symbol table |
import org.fraid.Scripting
import org.fraid.graphics.functions.*
import org.fraid.complex.functions.*
s = new Scripting()
new plot().exec(s.get_f("sin"))
Result:
|
print org.fraid.Scripting.get_f("sin").exec(2)
Result: (0.9092974268256817 - 0.0i) |
No |
| Define your own function |
import org.fraid.Scripting
import org.fraid.graphics.functions.*
import org.fraid.complex.functions.*
s = new Scripting()
my_f = s.def_f("f(x)=sin(x)^cos(x);")
new plot().exec(sin, my_f)
Result:
|
print new org.fraid.Scripting().def_f("f(x)=sin(x)^cos(x);").exec(2)
Result: (1.0403617660940427 + 0.0i) |
Yes |
| Define and get your own function from the symbol table |
import org.fraid.Scripting
import org.fraid.graphics.functions.*
import org.fraid.complex.functions.*
s = new Scripting()
s.def_f("f(x)=sin(x)^cos(x);")
new plot().exec(sin, s.get_f("f"))
Result:
|
s = new org.fraid.Scripting()
s.def_f("f(x)=sin(x)^cos(x);")
print s.get_f("f").exec(2)
Result: (1.0403617660940427 + 0.0i) |
Yes |
| Define your own function within the scripting environment |
import org.fraid.function.*
import org.fraid.complex.functions.*
import org.fraid.graphics.functions.*
import org.netlib.math.complex.Complex
class MyFun extends ComplexFunction{
MyFun(){ super(1); }
Complex invoke( Complex[] args ){
return args[0].sin().pow(args[0].cos());
}
}
new plot().exec( sin, new MyFun() )
Result:
|
import org.fraid.function.*
import org.fraid.complex.functions.*
import org.netlib.math.complex.Complex
class MyFun extends ComplexFunction{
MyFun(){ super(1); }
Complex invoke( Complex[] args ){
return args[0].sin().pow(args[0].cos());
}
}
print new MyFun().exec(2)
Result: (1.0403617660940427 + 0.0i) |
No |
Other useful functions in org.fraid.Scripting and org.fraid.ScriptingGraphics
| Description | Script | FrAid script required |
|---|---|---|
| Query the symbol table for all functions whith names starting wiht "si". |
print org.fraid.Scripting.query_f("si")
Result:[sinh:1, sin:1, sign:1] |
No |
| Query the symbol table, select a function from the result and invoke it. |
s = new org.fraid.Scripting()
q=s.query_f("si")
for( k in q ){
if( k == "sin" ){
print s.get_f( k ).
exec(2)
}
}
Result: (0.9092974268256817 - 0.0i) |
No |
| Plot some graphics and then close all the windows. |
s = new org.fraid.Scripting()
s.exec("plot(sin);\
f(x,r)=r*x*(1-x);\
orbit(f);")
print org.fraid.ScriptingGraphics.close_w( org.fraid.ScriptingGraphics.query_w() )
Result: 2 //number of windows closed |
Yes |
| - Open a window; - Plot something in it; - Change the color, span and size of the window; - Repaint. |
import org.fraid.complex.functions.*
import org.fraid.graphics.functions.*
s = new org.fraid.Scripting()
my_win = org.fraid.ScriptingGraphics.new_w()
new plot().exec( my_win, sin )
p = s.get_p(my_win)
p.backgroundColor = new java.awt.Color(100,0,100)
p.upperLeft = new org.fraid.math.DoublePoint( -10, 10 )
p.bottomRight = new org.fraid.math.DoublePoint( 10, -10 )
org.fraid.ScriptingGraphics.size_w(my_win,300,300)
org.fraid.ScriptingGraphics.paint_w(my_win)
Result: |
No |
| - Open a FrAid Console and work with the interpreter directly. |
prog = "plot(sin);"
org.fraid.ScriptingConsole.console( prog ) //prog can be empty ("")
Result: |
Yes |