int align, int colour, char *text) {}
void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}
void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) {}
+void draw_thick_line(drawing *dr, float thickness,
+ float x1, float y1, float x2, float y2, int colour) {}
void draw_polygon(drawing *dr, int *coords, int npoints,
int fillcolour, int outlinecolour) {}
void draw_circle(drawing *dr, int cx, int cy, int radius,