The library appears to have functions to draw shapes and lines
From DMD2.h
void drawLine(int x1, int y1, int x2, int y2, DMDGraphicsMode mode=GRAPHICS_ON);
void drawCircle(unsigned int xCenter, unsigned int yCenter, int radius, DMDGraphicsMode mode=GRAPHICS_ON);
void drawBox(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, DMDGraphicsMode mode=GRAPHICS_ON);
void drawFilledBox(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, DMDGraphicsMode mode=GRAPHICS_ON);
void drawTestPattern(DMDTestPattern pattern);
but before you go any further you need to think about how practical it is to draw an analogue clock on a display with such a limited number of pixels. Sketch out on squared paper how you expect it to look