我正在尝试为时间序列图创建一个mpld3鼠标位置插件,其x轴上的日期时间与此example类似。
但是,我在控制台中一直收到以下错误:
TypeError ax.x.invert is not a function
x = ax.x.invert(pos[0])
以下是一个例子:
import matplotlib.pyplot as plt
import mpld3
from datetime import datetime
class MousePositionDatePlugin(mpld3.plugins.PluginBase):
"""Plugin for displaying mouse position with a datetime x axis."""
JAVASCRIPT = """
mpld3.register_plugin("mousepositiondate", MousePositionDatePlugin);
MousePositionDatePlugin.prototype = Object.create(mpld3.Plugin.prototype);
MousePositionDatePlugin.prototype.constructor = MousePositionDatePlugin;
MousePositionDatePlugin.prototype.requiredProps = [];
MousePositionDatePlugin.prototype.defaultProps = {
fontsize: 12,
xfmt: "%Y-%m-%d %H:%M:%S",
yfmt: ".3g"
};
function MousePositionDatePlugin(fig, props) {
mpld3.Plugin.call(this, fig, props);
}
MousePositionDatePlugin.prototype.draw = function() {
var fig = this.fig;
var xfmt = d3.format(this.props.xfmt);
var yfmt = d3.format(this.props.yfmt);
var coords = fig.canvas.append("text").attr("class", "mpld3-coordinates").style("text-anchor", "end").style("font-size", this.props.fontsize).attr("x", this.fig.width - 5).attr("y", this.fig.height - 5);
for (var i = 0; i < this.fig.axes.length; i++) {
var update_coords = function() {
var ax = fig.axes[i];
return function() {
var pos = d3.mouse(this);
x = ax.x.invert(pos[0]);
y = ax.y.invert(pos[1]);
coords.text("(" + xfmt(x) + ", " + yfmt(y) + ")");
};
}();
fig.axes[i].baseaxes.on("mousemove", update_coords).on("mouseout", function() {
coords.text("");
});
}
};
"""
def __init__(self, fontsize=14, xfmt="%Y-%m-%d %H:%M:%S", yfmt=".3g"):
self.dict_ = {"type": "mousepositiondate",
"fontsize": fontsize,
"xfmt": xfmt,
"yfmt": yfmt}
fig, ax = plt.subplots()
dates = [datetime(2015, 9, 10), datetime(2015, 9, 11), datetime(2015, 9, 12), datetime(2015, 9, 13)]
values = [2, 4, 6, 8]
points = plt.plot(dates, values, marker="o", markerfacecolor="none")
mpld3.plugins.connect(fig, MousePositionDatePlugin())
mpld3.save_html(fig, "./mpld3_mousepositiondateplugin.html")
关于如何让插件正常工作的任何想法?
答案 0 :(得分:1)
显然,当轴包含python datetime对象而不是浮点数或整数时,轴的x轴属性没有反转函数。解决方案是使用ax.xdom
和ax.ydom
代替ax.x
和ax.y
,并使用d3.time.format()
而不是d3.format()
格式化日期字符串。< / p>
以下是解决方案的示例:
import matplotlib.pyplot as plt
import mpld3
from datetime import datetime
class MousePositionDatePlugin(mpld3.plugins.PluginBase):
"""Plugin for displaying mouse position with a datetime x axis."""
JAVASCRIPT = """
mpld3.register_plugin("mousepositiondate", MousePositionDatePlugin);
MousePositionDatePlugin.prototype = Object.create(mpld3.Plugin.prototype);
MousePositionDatePlugin.prototype.constructor = MousePositionDatePlugin;
MousePositionDatePlugin.prototype.requiredProps = [];
MousePositionDatePlugin.prototype.defaultProps = {
fontsize: 12,
xfmt: "%Y-%m-%d %H:%M:%S",
yfmt: ".3g"
};
function MousePositionDatePlugin(fig, props) {
mpld3.Plugin.call(this, fig, props);
}
MousePositionDatePlugin.prototype.draw = function() {
var fig = this.fig;
var xfmt = d3.time.format(this.props.xfmt);
var yfmt = d3.format(this.props.yfmt);
var coords = fig.canvas.append("text").attr("class", "mpld3-coordinates").style("text-anchor", "end").style("font-size", this.props.fontsize).attr("x", this.fig.width - 5).attr("y", this.fig.height - 5);
for (var i = 0; i < this.fig.axes.length; i++) {
var update_coords = function() {
var ax = fig.axes[i];
return function() {
var pos = d3.mouse(this);
x = ax.xdom.invert(pos[0]);
y = ax.ydom.invert(pos[1]);
coords.text("(" + xfmt(x) + ", " + yfmt(y) + ")");
};
}();
fig.axes[i].baseaxes.on("mousemove", update_coords).on("mouseout", function() {
coords.text("");
});
}
};
"""
def __init__(self, fontsize=14, xfmt="%Y-%m-%d %H:%M:%S", yfmt=".3g"):
self.dict_ = {"type": "mousepositiondate",
"fontsize": fontsize,
"xfmt": xfmt,
"yfmt": yfmt}
fig, ax = plt.subplots()
dates = [datetime(2015, 9, 10), datetime(2015, 9, 11), datetime(2015, 9, 12), datetime(2015, 9, 13)]
values = [2, 4, 6, 8]
points = plt.plot(dates, values, marker="o", markerfacecolor="none")
mpld3.plugins.connect(fig, MousePositionDatePlugin())
mpld3.save_html(fig, "./mpld3_mousepositiondateplugin.html")
希望其他人觉得有用。