在mpld3中如何使红线可拖动？

问题描述

我正在尝试使用鼠标指针在垂直方向上向右和向左拖动红色垂直线，并且在释放时我想打印 x 轴值。我无法将 line_a 与 DragPlugin 类连接。我按照 https://mpld3.github.io/examples/drag_points.html 这段代码作为参考。

"""
Draggable Points Example
========================
This example shows how a D3 plugin can be created to make plot elements
draggable.  A stopPropagation command is used to allow the drag behavior
and pan/zoom behavior to work in tandem.
"""
import numpy as np
import matplotlib.pyplot as plt
import matplotlib as mpl

import mpld3
from matplotlib import lines
from mpld3 import plugins,utils


class DragPlugin(plugins.PluginBase):
    JAVASCRIPT = r"""
    mpld3.register_plugin("drag",DragPlugin);
    DragPlugin.prototype = Object.create(mpld3.Plugin.prototype);
    DragPlugin.prototype.constructor = DragPlugin;
    DragPlugin.prototype.requiredProps = ["id"];
    DragPlugin.prototype.defaultProps = {}
    function DragPlugin(fig,props){
        mpld3.Plugin.call(this,fig,props);
        mpld3.insert_css("#" + fig.figid + " path.dragging",{"fill-opacity": "1.0 !important","stroke-opacity": "1.0 !important"});
    };

    DragPlugin.prototype.draw = function(){
        var obj = mpld3.get_element(this.props.id);

        var drag = d3.drag()
            .on("drag",dragged)

        obj.elements()
           .data(obj.offsets)
           .style("cursor","default")
           .call(drag);

        function dragstarted(d) {
          d3.event.sourceEvent.stopPropagation();
          d3.select(this).classed("dragging",true);
        }

        function dragged(d,i) {
          d[0] = obj.ax.x.invert(d3.event.x);
          d[1] = obj.ax.y.invert(d3.event.y);
          d3.select(this)
            .attr("transform","translate(" + [d3.event.x,d3.event.y] + ")");
        }

        function dragended(d) {
          d3.select(this).classed("dragging",false);
        }
    }
    """

    def __init__(self,points):
        if isinstance(points,mpl.lines.Line2D):
            suffix = "pts"
        else:
            suffix = None

        self.dict_ = {"type": "drag","id": utils.get_id(points,suffix)}


fig,ax = plt.subplots()
np.random.seed(0)
points = ax.plot(np.random.normal(size=20),np.random.normal(size=20),'or',alpha=0.5,markersize=50,markeredgewidth=1)
line_a = lines.Line2D((0.5,0.5),(-3,3),pickradius=5,color="r",linewidth=2)
ax.add_line(line_a)
ax.set_title("Click and Drag",fontsize=18)

plugins.connect(fig,DragPlugin(points[0]))
plugins.connect(fig,DragPlugin(line_a))

mpld3.show()

请指导我如何实现用户可以使用鼠标指针垂直拖动红线标记并在释放鼠标时获取其位置的代码？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

django matplotlib mpld3 python