A CESSNA 177RG MADE AN INADVERTENT INCURSION INTO RESTR AIRSPACE CAUSED BY LACK OF AWARENESS IN MONITORING THE AUTOPLT PERFORMANCE.

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I DEPARTED YYY AT APPROX XA20 PM ON SATURDAY NIGHT; 11/SAT/01. I PLANNED A VFR FLT AT 11500 FT DIRECT TO XXX; DIRECT TO WWW; DIRECT TO YZZ. THIS WOULD ALLOW FOR AN ACCEPTABLE DISTANCE FROM THE RESTR AREA AROUND XZZ; EVEN IF IT WENT TO 8 MI; WHILE I WAS FLYING; VS THE STANDARD 5 MI. BETWEEN XXX AND WWW; I WAS TALKING WITH MY STUDENT; AUTOPLT ON; WHEN I LOOKED DOWN AND NOTICED THAT I WAS PROBABLY TOO CLOSE TO ZZZ. THE GPS COURSE I HAD SET TOLD ME TO CORRECT 12 DEGS TO THE R. I IMMEDIATELY TURNED TO A SOUTHERLY HEADING TO GET BACK ON COURSE. A FEW MINS LATER; I WAS INTERCEPTED BY A MILITARY ACFT; I'M NOT SURE WHAT TYPE. HE FLEW FROM L TO R; DIRECTLY UNDERNEATH ME; WITH AN IMMEDIATE TURN TO THE L AND AHEAD OF ME. I TUNED TO 121.5 TO SEE IF HE WAS TRYING TO CONTACT ME. I THEN TUNED ON MY OTHER RADIO TO CONTACT ZZZ APCH TO LET THEM KNOW WHAT WAS HAPPENING. I PLANNED TO CONTACT THEM SOON ANYWAY; SINCE I NEEDED TO DESCEND DOWN THROUGH THE CLASS B. I COULD NOT GET A REPLY FROM ZZZ APCH. I THEN CALLED XYZ APCH; THEY GAVE ME A DIFFERENT FREQ FOR ZZZ APCH. I DON'T REMEMBER WHAT FREQ IT WAS; BUT I GOT A REPLY AND A TRANSPONDER CODE. BY THIS TIME THE MILITARY ACFT HAD ALREADY FLOWN BY FROM L TO R; DIRECTLY UNDERNEATH ME; FOR THE SECOND TIME; BUT THEN WENT OUT-OF-SIGHT. I CONTINUED MY DIRECT PATH TO YZZ WITH CLRNC FROM ZZZ APCH TO DESCEND INTO THE ENHANCED CLASS B. UPON RPTING 'ARPT IN SIGHT' HE HAD A PHONE NUMBER FOR ME TO CALL ZZZ CTR. AFTER EXPLAINING WHAT HAPPENED TO THE DESK WATCH ON DUTY; HE TOOK MY NAME AND NUMBER AND SAID THAT HE WOULD FORWARD IT TO THE MILITARY AND THEY MIGHT CALL ME.