By Michael Sweet, Craig P. Earls, and Bill Spitzak
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Extra info for FLTK 1.1.7 programming manual.Rev7
The advantage over using fl_arc with floating point coordinates is that they are faster because they often use the hardware, and they draw much nicer small circles, since the small sizes are often hard-coded bitmaps. If a complete circle is drawn it will fit inside the passed bounding box. The two angles are measured in degrees counterclockwise from 3'oclock and are the starting and ending angle of the arc, a2 must be greater or equal to a1. fl_arc() draws a series of lines to approximate the arc.
The function should measure the size of the label and set w and h to the size it will occupy. 7 Programming Manual #define XYZ_LABEL FL_FREE_LABELTYPE Fl::set_labeltype(XYZ_LABEL, xyz_draw, xyz_measure); The label type number n can be any integer value starting at the constant FL_FREE_LABELTYPE. Once you have added the label type you can use the labeltype() method to select your label type. The Fl::set_labeltype method can also be used to overload an existing label type such as FL_NORMAL_LABEL.
Note: You must call fl_pop_clip() once for every time you call fl_push_clip(). If you return to FLTK with the clip stack not empty unpredictable results occur. int fl_not_clipped(int x, int y, int w, int h) Returns non-zero if any of the rectangle intersects the current clip region. If this returns 0 you don't have to draw the object. Note: Under X this returns 2 if the rectangle is partially clipped, and 1 if it is entirely inside the clip region. 7 Programming Manual int fl_clip_box(int x, int y, int w, int h, int &X, int &Y, int &W, int &H) Intersect the rectangle x,y,w,h with the current clip region and returns the bounding box of the result in X,Y,W,H.