Jupyter Notebook中的Google Colabs eval

问题描述

是否有某种方法可以在Jupyter Notebook中获得google.colab.output.eval_js的行为？我有一些使用IPython.display来让用户绘制图像的代码。当按下按钮时，JS将图像的内容另存为data，然后我在Python中使用data = eval_js("data")将这些内容提取到Python中。我正在尝试在Jupyter Notebook中复制该行为。我将完整的代码放在下面。

from IPython.display import HTML,Image
from google.colab.output import eval_js

canvas_html = """
<canvas width=%d height=%d style="background-color:rgb(240,240,240)"=></canvas>
<button>Guess Number</button>
<script>
var canvas = document.querySelector('canvas')
var ctx = canvas.getContext('2d')
ctx.lineWidth = %d
var button = document.querySelector('button')
var mouse = {x: 0,y: 0}
canvas.addEventListener('mousemove',function(e) {
  mouse.x = e.pageX - this.offsetLeft
  mouse.y = e.pageY - this.offsetTop
})
canvas.onmousedown = ()=>{
  ctx.beginPath()
  ctx.moveTo(mouse.x,mouse.y)
  canvas.addEventListener('mousemove',onPaint)
}
canvas.onmouseup = ()=>{
  canvas.removeEventListener('mousemove',onPaint)
}
var onPaint = ()=>{
  ctx.lineTo(mouse.x,mouse.y)
  ctx.stroke()
}
var data = new Promise(resolve=>{
  button.onclick = ()=>{
    resolve(canvas.toDataURL('image/png'))
  }
})
</script>
"""

def draw(filename='drawing.png',w=280,h=280,line_width=20):
  display(HTML(canvas_html % (w,h,line_width)))
  data = eval_js("data")
  # do sth with the variable in python ...

解决方法

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google-colaboratory javascript jupyter-notebook python

Jupyter Notebook中的Google Colabs eval_js？

问题描述

解决方法