Description of draw_labels

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draw_labels

PURPOSE

draw_labels(g) --- add labels to a drawing of g

SYNOPSIS

function draw_labels(g,offset)

DESCRIPTION

 draw_labels(g) --- add labels to a drawing of g
 assuming g has already been drawn in a figure window (with draw or cdraw)
 add labels to the drawing. 
 Note: draw(g); add_labels(g) is tantamount to ldraw(g)
 If the drawing already has vertex numbers, this might make a mess.

 An optional second argument gives an offset of the label away from the
 vertex: draw_labels(g, [dx, dy]) moves the label dx to the right and dy
 up. Suggested offset: [0.1, -0.1]

CROSS-REFERENCE INFORMATION

This function calls:

• get_label get_label(g) or get_label(g,v) --- get vertex label(s)
• getxy getxy(g) --- give g's embedding (or [] if g doesn't have one)
• is_labeled is_labeled(g) --- determine if there are labels on vertices.
• label Assign labels to vertices of g
• nv nv(g) --- number of vertices in g

This function is called by:

• ldraw ldraw(g,line_style) --- draw a graph with vertices marked with their labels

SOURCE CODE

0001 function draw_labels(g,offset)
0002 % draw_labels(g) --- add labels to a drawing of g
0003 % assuming g has already been drawn in a figure window (with draw or cdraw)
0004 % add labels to the drawing.
0005 % Note: draw(g); add_labels(g) is tantamount to ldraw(g)
0006 % If the drawing already has vertex numbers, this might make a mess.
0007 %
0008 % An optional second argument gives an offset of the label away from the
0009 % vertex: draw_labels(g, [dx, dy]) moves the label dx to the right and dy
0010 % up. Suggested offset: [0.1, -0.1]
0011 
0012 if (~is_labeled(g))
0013     label(g)
0014 end
0015 
0016 if nargin == 1
0017     offset = [0 0];
0018 end
0019 
0020 xy = getxy(g);
0021 n = nv(g);
0022 
0023 for v=1:n
0024     x = xy(v,1) + offset(1);
0025     y = xy(v,2) + offset(2);
0026     text(x,y,get_label(g,v)); 
0027 end

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