 |  |
9.12. 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.
|  | |
| 9.11. Translating Coordinates |  | 9.13. Changing the Display List |
Copyright © 2002 O'Reilly & Associates. All rights reserved.