📌  相关文章
📜  Tk-画布小部件

📅  最后修改于: 2020-10-16 06:34:28             🧑  作者: Mango

画布用于提供绘图区域。 canvas小部件的语法如下所示-

canvas canvasName options

选件

下表中列出了画布小部件可用的选项-

Sr.No. Syntax & Description
1

-background color

Used to set background color for widget.
2

-closeenough distance

Sets the closeness of mouse cursor to a displayable item. The default is 1.0 pixel. This value may be a fraction and must be positive.
3

-scrollregion boundingBox

The bounding box for the total area of this canvas.
4

-height number

Used to set height for widget.
5

-width number

Sets the width for widget.
6

-xscrollincrement size

The amount to scroll horizontally when scrolling is requested.
7

-yscrollincrement size

The amount to scroll vertically when scrolling is requested.

画布小部件的一个简单示例如下所示-

#!/usr/bin/wish

canvas .myCanvas -background red -width 100 -height 100 
pack .myCanvas

当我们运行上面的程序时，我们将获得以下输出-

画布小部件示例

画布中的绘图小部件

下面列出了可在画布中绘制的可用小部件的列表-

Sr.No. Widget & Description
1 Line

Draws a line.
2 Arc

Draws an arc.
3 Rectangle

Draws a rectangle.
4 Oval

Draws an oval.
5 Polygon

Draws a polygon.
6 Text

Draws a text.
7 Bitmap

Draws a bitmap.
8 Image

Draws an image.

下面显示了一个使用不同画布小部件的示例-

#!/usr/bin/wish

canvas .myCanvas -background red -width 200 -height 200 
pack .myCanvas
.myCanvas create arc 10 10 50 50 -fill yellow
.myCanvas create line 10 30 50 50 100 10 -arrow both -fill yellow -smooth true
   -splinesteps 2
.myCanvas create oval 50 50 100 80 -fill yellow
.myCanvas create polygon 50 150 100 80 120 120 100 190 -fill yellow -outline green
.myCanvas create rectangle 150 150 170 170  -fill yellow
.myCanvas create text 170 20 -fill yellow -text "Hello" -font {Helvetica -18 bold}
.myCanvas create bitmap 180 50 -bitmap info

当我们运行上面的程序时，我们将获得以下输出-

画布小部件示例2