Moving Items Around
Once an item has
been created on the Canvas, use move
or
coords
to move it around. The
move
method takes a tag or ID to indicate which
items to move and the amounts to add to the x and y coordinates:
$canvas->move(tag/id, xdistance, ydistance
);
For instance, the following code moves items with the
"blue"
tag 100 pixels in the x direction and 100
pixels in the y direction:
$canvas->move("blue", 100, 100);
To move an
item in the negative direction, simply specify a negative value for
the xdistance
and/or
ydistance
. The other method,
coords
, allows you to specify a new x and y
location for the first item found that is identified by the tag or
ID:
$canvas->coords(tag/id
,newx
,newy
);
If the item requires more than one set of (x, y) coordinates, you simply continue to specify them:
$canvas->coords(tag/id
,newx1
,newy1
,newx2
,newy2...
);
To find where an item currently is in the Canvas, use
coords
without specifying the x or y coordinates:
@coords_list = $canvas->coords(tag/id
);
Remember, the coords
method only applies to the
first item it finds that matches the given tag or ID.
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