一硝:(HHV(HIGH,9) LLV(LOW,9))/2,COLORMAGENTA,LINETHICK2;
二黃:(HHV(HIGH,26) LLV(LOW,26))/2,COLORYELLOW,LINETHICK2;
硝酸鉀:=MA(C,3);
硫磺:=MA(硝酸鉀,5);
木炭:=MA(硝酸鉀,60);
三木炭:=3*木炭-2*硫磺;
AA:=CROSS(二黃,三木炭);
BB:=CROSS(一硝,二黃);
DRAWTEXT(BB,二黃,'火'),COLORRED;
DRAWTEXT(AA,二黃,'黑火藥'),COLORGREEN;
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