randomized drawing tool.(stroke set between .5 and 15)
includes the following features:
if mousePressed = black stroke
if no mousePressed = whitestroke
if(key=='3') = small triangles
if(key=='s') = SAVE
if(key=='c') = ClEAR
if(key=='b') = BLUR
if(key=='t') =THRESHOLD);
if(key=='i')= INVERT
if(key=='e') = ERODE
if(key=='d') = DILATE
if(key=='p') = POSTERIZE,12;
if(key=='o') = OPAQUE
if(key=='r') = random background (clear)