canvas_gradient - Canvas with a gradient background
NAME SYNOPSIS DESCRIPTION API OPTIONS EXAMPLE BUGS, IDEAS, FEEDBACK KEYWORDS COPYRIGHT______________________________________________________________________________
NAME
canvas::gradient − Canvas with a gradient background
SYNOPSIS
package require Tcl 8.5
package require Tk 8.5
package require canvas::gradient ?0.2?
::canvas::gradient pathName ?options?... ______________________________________________________________________________
DESCRIPTION
This package provides a command to set background gradients on canvases.
NOTE! This package reserves the canvas tag canvas::gradient for its use.
API
::canvas::gradient pathName ?options?...
Creates a background gradient on the canvas pathName. An existing gradient is replaced by the new definition.
The set of available options is decribed below, in section Options.
OPTIONS
-direction direction
The value for this option specifies the direction of the gradient. If not specified the system defaults to x, a horizontal gradient. The package supports five directions:
|
x |
for a horizontal gradient (default). Color changes along the x-axis, with the start color at the left. | ||
|
y |
for a vertical gradient. Color changes along the y-axis, with the start color at the top. | ||
|
d1 |
for a diagonal gradient from left+top to bottom+right. Color changes along the diagonal. with the start color at left+top. | ||
|
d2 |
for a diagonal gradient from left+bottom to top+right. Color changes along the diagonal. with the start color at left+bottom. | ||
|
r |
for a radial gradient around the center of the viewport Color changes from the center outward, with the start color at the center. |
-color1 color
The value for this option specifies the starting color of the gradient. If not specified it defaults to red.
-color2 color
The value for this option specifies the ending color of the gradient. If not specified it defaults to green.
-type type
The value for this option specifies how the gradient is calculated. The package currently supports on ly one method, which is the default, naturally:
|
linear |
for linear interpolation between the start and end colors (default). |
EXAMPLE
package require canvas::gradient
|
canvas .c | ||
|
canvas::gradient .c -direction x -color1 yellow -color2 blue | ||
|
pack .c -fill both -expand 1 |
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category canvas of the Tklib Trackers [http://core.tcl.tk/tklib/reportlist]. Please also report any ideas for enhancements you may have for either package and/or documentation.
KEYWORDS
background, canvas, color gradient, gradients, image, widget background
COPYRIGHT
Copyright (c)
2013 Jarek Lewandowski, MaxJarek
Copyright (c) Origin http://wiki.tcl.tk/6100
Copyright (c) Origin http://wiki.tcl.tk/37242
Copyright (c) Origin http://wiki.tcl.tk/9079