java.awt.Graphics

[Tao <tx11 at cornell dot edu>]

Hi:
        i am a graduate in Cornell University.

        I download the gcj 2.96-22-i386.rpm for my redhat linux 7.0 from
the Update agent.  If I type gcj --help, it gave me the instruction.  I
have a set of files which runs fine in Windows Codeworrier.  When I put
them on my linux box terminal like this:

         gcj --main=<the main file>  -o  rs  file1.java  file2.javai

this is my comand:

gcj  --main=CUCSGraphicsApplication.java  -o rs  Mars.java
CUCSDrawing.java Robot.java


and these are the error message,  here below:

Mars.java: In class `Mars':
Mars.java: In method `myGraphics()':
Mars.java:147: Can't find method `translate(II)' in type
`java.awt.Graphics'.
  g.translate(d.getInsets().left-pen,d.getInsets().top-pen);
                 ^
Mars.java: In method `paintCell(java.awt.Graphics,int,int)':
Mars.java:213: Can't find method `setColor(Ljava/awt/Color;)' in type
`java.awt.Graphics'.
   g.setColor(unknown && i == bumpy && j == bumpx ?
                         ^
Mars.java:215: Can't find method `fillRect(IIII)' in type
`java.awt.Graphics'.
   g.fillRect(x,y,pen,pen);
                         ^
Mars.java:217: Can't find method `clearRect(IIII)' in type
`java.awt.Graphics'.
    g.clearRect(x+2,y+2,pen-4,pen-4);
                                 ^
Mars.java: In method `erase(java.awt.Graphics,int,int)':
Mars.java:235: Can't find method `clearRect(IIII)' in type
`java.awt.Graphics'.
  g.clearRect(j*pen,i*pen,pen,pen);
                 ^
Mars.java: In method `drawGnat(java.awt.Graphics)':
Mars.java:241: Can't find method `clearRect(IIII)' in type
`java.awt.Graphics'.
  g.clearRect(x,y,pen,pen);
                 ^
Mars.java:242: Can't find method `setColor(Ljava/awt/Color;)' in type
`java.awt.Graphics'.
  g.setColor(Color.black);
                 ^
Mars.java:243: Can't find method `fillOval(IIII)' in type
`java.awt.Graphics'.
  g.fillOval(x+1,y+1,pen-2,pen-2);
                 ^
Mars.java: In method `drawRobot(java.awt.Graphics)':
Mars.java:249: Can't find method `clearRect(IIII)' in type
`java.awt.Graphics'.
  g.clearRect(x,y,pen,pen);
                 ^
Mars.java:250: Can't find method `setColor(Ljava/awt/Color;)' in type
`java.awt.Graphics'.
  g.setColor(Color.blue);
                 ^
Mars.java:251: Can't find method `drawOval(IIII)' in type
`java.awt.Graphics'.
  g.drawOval(x+1,y+1,pen-2,pen-2);
                 ^
Mars.java:252: Can't find method `drawOval(IIII)' in type
`java.awt.Graphics'.
  g.drawOval(x+2,y+2,pen-4,pen-4);
                 ^
Mars.java: In method `drawPlan(java.awt.Graphics,boolean)':
Mars.java:313: Can't find method `setColor(Ljava/awt/Color;)' in type
`java.awt.Graphics'.
  g.setColor(erase ? Color.white : Color.black);
                 ^
Mars.java:314: Can't find method `translate(II)' in type
`java.awt.Graphics'.
  g.translate(pen/2,pen/2);
                 ^
Mars.java:316: Can't find method `drawLine(IIII)' in type
`java.awt.Graphics'.
   g.drawLine(plan[i][1]*pen, plan[i][0]*pen,
                         ^
Mars.java:318: Can't find method `translate(II)' in type
`java.awt.Graphics'.
   g.translate(-pen/2,-pen/2);
                         ^
Mars.java: In method `moveRobot()':
Mars.java:349: Can't find method `translate(II)' in type
`java.awt.Graphics'.
    g.translate(tx,ty); paint(g);
                                 ^
Mars.java:350: Can't find method `translate(II)' in type
`java.awt.Graphics'.
    g.translate(-tx, -ty); paint(g);
                                 ^
18 errors

*************************************************************************



It looks like the reason is  in Mars.java, I declared a variable

        Graphics g=myGraphics();    and uses

        g.translate(x, y)   et al,  which are supposed to be existed in
the java.awt.Graphics class.

        myGraphics()   is a method which come from my subclass of  the
java.awt.Frame class by getGraphics() and return it.

         and I import the java.awt.*  class on all my classes.  Is
something wrong with me?  or the

         java.awt.Graphics in libgcj  does not contain those methods
such as setColor, fillOval, which should be there?

         Looking forward to your help.

        thank you.