A triangle, for example, might have vertices of (0,0), (10,10), and (10,0).
getPt(index), setPt(index,x,y), and deletePt(index)
getPt() returns the point corresponding to the vertex at a given
setPt()enables you to modify the vertex at
index to contain the new point
deletePt() deletes a vertex from the polygon.
length() and vertices()
length()returns the number of vertices in the polygon, and
vertices()returns a list of those vertices. The list returned by
vertices() contains references to arrays containing the
(x,y) coordinates of each vertex.
bounds()method returns the smallest bounding rectangle of the polygon specified as the list
($left,$top,$right,$bottom), where each of these variables is a reference to an array specifying the
(x,y) coordinate values.
offset(dx,dy) method enables you to move a polygon by a specified offset of
dy. Each vertex is offset by these amounts. This method is useful for the animation of a polygon.
map(srcL,srcT,srcR,srcB,destL,destT,destR,destB) method maps a polygon from a source rectangle to an equivalent position within a destination rectangle. The polygon is moved and resized according to the mapping between the two rectangles. You can use the bounding box of the polygon itself as the
As I mentioned previously, four fonts are available for use within the
GD module. These fonts are specified as constants and are exported into your namespace when you load the
GD module. This class additionally provides methods for querying the font.
nchars() returns the number of glyphs contained in the font,
offset() returns the ASCII value of the first character in the font, and
height() return the width and height of the font.
Currently, you cannot create your own fonts or manipulate the predefined fonts. Perhaps this support will be added to the GD library one day.
You can find the latest
GD module in your nearest CPAN location, along with a more complete reference of the functionality. For more information on the GD library, refer to