[ENH] 添加用户自定义图片并与铰链绑定的功能建议 Add Custom Image Binding to Joints with Transparency Options

[H1W0XXX]

建议内容Suggestion：
中文：
我建议为平面连杆机构仿真软件添加以下功能：

允许用户向画布添加自定义图片。
提供将图片绑定到特定铰链的选项。
在模拟运动时，图片会跟随铰链移动。
为运动轨迹添加透明度调节功能，可以分别调整：
a. 绑定图片的透明度
b. 铰链本身的透明度
提供显示/隐藏绑定图片的选项。

English：
I suggest adding the following features to the planar linkage mechanism simulation software:

Allow users to add custom images to the canvas.
Provide an option to bind images to specific joints.
During motion simulation, the images will move along with the joints.
Add transparency adjustment functionality for motion trajectories, with separate controls for:
a. The transparency of bound images
b. The transparency of joints themselves
Offer options to show/hide bound images.

practical use cases实际使用举例 https://space.bilibili.com/3546571889183027