Table 37-12. Operations on a canvas widget
$c addtag tag above $t | Adds tag to the item just above $t in the display list. |
$c addtag tag all | Adds tag to all objects in the canvas. |
$c addtag tag below $t | Adds tag to the item just below $t in the display list. |
$c addtag tag closest x y ?halo? ?start? | Adds tag to the item closest to the x y position. If more than one object is the same distance away, or if more than one object is within halo pixels, then the last one in the display list (uppermost) is returned. If start is specified, the closest object after start in the display list is returned. |
$c addtag tag enclosed x1 y1 x2 y2 | Adds tag to the items completely enclosed in the specified region. x1 <= x2, y1 <= y2. |
$c addtag tag overlapping x1 y1 x2 y2 | Adds tag to the items that overlap the specified region. x1 <= x2, y1 <= y2. |
$c addtag tag withtag $t | Adds tag to the items identified by $t. |
$c bbox $t ?tag tag ...? | Returns the bounding box of the items identified by the tag(s) in the form x1 y1 x2 y2 |
$c bind $t ?sequence? ?command? | Sets or queries the bindings of canvas items. |
$c canvasx screenx ?grid? | Maps from the X screen coordinate screenx to the X coordinate in canvas space, rounded to multiples of grid if specified. |
$c canvasy screeny ?grid? | Maps from screen Y to canvas Y. |
$c cget option | Returns the value of option for the canvas. |
$c configure ... | Queries or updates the attributes of the canvas. |
$c coords $t ?x1 y1 ...? | Queries or modifies the coordinates of the item. As of Tk 8.3, a list of coordinates can be provided as a single argument. |
$c create type x y ?x2 y2 ...? ?opt value ...? | Creates a canvas object of the specified type at the specified coordinates. As of Tk 8.3, a list of coordinates can be provided as a single argument. |
$c delete $t ?tag ...? | Deletes the item(s) specified by the tag(s) or ID(s). |
$c dtag $t ?deltag? | Removes the specified tags from the items identified by $t. If deltag is omitted, it defaults to $t. |
$c find addtagSearch ... | Returns the IDs of the tags that match the addtag search specification: above, all, below, closest, enclosed, overlapping and withtag. |
$c gettags $t | Returns the tags associated with the first item identified by $t. |
$c itemcget $t option | Returns the value of option for item $t. |
$c itemconfigure $t ... | Queries or reconfigures item $t. |
$c lower $t ?belowThis? | Moves the items identified by $t to the beginning of the display list, or just before belowThis. |
$c move $t dx dy | Moves $t by the specified amount. |
$c postscript ... | Generates Postscript. Table 37-13 lists options. |
$c raise $t ?aboveThis? | Moves the items identified by $t to the end of the display list, or just after aboveThis. |
$c scale $t x0 y0 xS yS | Scales the coordinates of the items identified by $t. The distance between x0 and a given X coordinate changes by a factor of xS. Similarly for Y. |
$c scan mark x y | Sets a mark for a scrolling operation. |
$c scan dragto x y | Scrolls the canvas from the previous mark. |
$c type $t | Returns the type of the first item identified by $t. |
$t xview | Returns two fractions between zero and one that describes the amount of the canvas off-screen to the left and the amount of the canvas displayed. |
$t xview moveto fraction | Positions the canvas so that fraction of the scroll region is off screen to the left. |
$t xview scroll num what | Scrolls num of what, which is units or pages. |
$t yview | Returns two fractions between zero and one that describes the amount of the canvas off screen to the top and the amount of the canvas displayed. |
$t yview moveto fraction | Positions the text so that fraction of the canvas scroll region is off screen toward the top. |
$t yview scroll num what | Scrolls num of what, which is units or pages. |
