Re: math equations in java
Jeremy Watts wrote:
"Jeremy Watts" <jwatts1970@hotmail.com> wrote in message
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Jeremy Watts wrote:
"bugbear" <bugbear@trim_papermule.co.uk_trim> wrote in message
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Jeremy Watts wrote:
is there any kind of font/typeset (sorry for the vagueness) available
in java that allows the expression of equations or algebraic
expressions?
i am meaning something like x^3 + 3x^2 - 5, where here the '3' and the
'2' indices would be raised to the top right of the 'x' symbol so as
to appear as it would be written in a math text book or whatever.
anyone know what i'm on about here :)
Do you mean in java code, in an application coded in Java?
Its for use with an application coded in java, so that its output may be
displayed on a screen to a user in a mathematical format.
So what's wrong with my earlier suggestion?
new JLabel("x\u00B3 + 3x\u00B2 - 5");
Nothing at all, just havent tried it yet :) Many thanks
Actually, just tried the JLabel line you suggested, firstly importing the
"javax.swing.JLabel" class, and then :-
JLabel expression = new JLabel("x\u00B3 + 3x\u00b2 - 5");
How would I now display that? I've tried System.out.println(expression),
but it produces something weird.. Is this thing a graphics thing or
something?
Yes, when you wrote about "font ... available in java" I assumed you
were referring to GUI display of (a limited subset of) mathematical
expressions. JLabel is a Swing component used in graphical user
interfaces of the sort familiar to users of Microsoft Windows applications.
It isn't graphical in the sense of vector line/curve drawing approaches
to the rendering of mathematical expressions.
I can't think of any other interpretation of "font ... available in
java" but presumably there is. I look forward to finding out.
As ever, Andrew is right in saying the same string would work when
output to the console. The console may need to be configured to use an
appropriate font - In many locales the default font may be OK.
----------------------------------- 8< ---------------------------------
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
// GUI version using Java Swing
public class MathExpression {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new MathExpression();
}
});
}
MathExpression() {
JPanel p = new JPanel();
p.add(new JLabel("x\u00B3 + 3x\u00B2 - 5"));
JFrame f = new JFrame("MathExpression");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(p);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
----------------------------------- 8< ---------------------------------
// non-GUI console version
public class MathExpressionConsole {
public static void main(String[] args) {
System.out.println("x\u00B3 + 3x\u00B2 - 5");
}
}
----------------------------------- 8< ---------------------------------
Both the above work for me using Eclipse on Vista.
If you need to display more ambitious mathematical expressions, the
suggestions made by other responders will be more appropriate. In that
case the console is an inadequate medium.
--
RGB