Perl Graphics Programming

Attributes of GD::Graph Objects

GD::Graph has several attributes that you can set to control the layout, color, and labels on your graph. Some of these attributes are applicable only to certain types of graphs; for example, the pie_height attribute should be set only for graphs of type GD::Graph::pie. These attributes are relegated to their own sections later in this chapter. The following section describes the attributes shared by all graphs.

Attributes of All Graphs

b_margin=>integert_margin=>integerl_margin=>integerr_margin=>integer

These attributes allow you to set the bottom, top, left, and right margins, respectively. The margin is defined as the blank space between the bounding box of the graph and the edge of the PNG graphic. The default margins are 0 pixels.

width=>integerheight=>integer

The dimensions of the final image, including margins.

transparent=>boolean

If the transparent attribute is set to true, the background color (set with the bgclr attribute) is marked as transparent. The default value is true.

interlaced=>boolean

The interlaced attribute allows you to indicate whether the graph is stored as an interlaced PNG. The default value is true.

bgclr=>colornamefgclr=>colornameboxcolor=>colornametextclr=>colornamelabelclr=>colornameaxislabelclr=>colornamelegendclr=>colornamevaluesclr=>colornameaccentclr=>colornameshadowclr=>colorname

These attributes set the colors of the various aspects of the graph: the background, foreground, graph box, text, label, axis label, legend, value ...