echarts_example.pyΒΆ

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"""
Example demonstrating how to integrate famous eChart into flexx.
"""

# By Scott_Huang@qq.com   at 2020-02-29

from flexx import flx

# # use local assests, I download the echarts.min.js and put in local folder
# import os
#
# BASE_DIR = os.getcwd()
# with open(BASE_DIR + "/static/echarts/echarts.min.js", encoding="utf-8") as f:
#     script = f.read()
# flx.assets.associate_asset(__name__, "echart_script.js", script)

# or use the online CDN. For desktop app, would better use local assets
flx.assets.associate_asset(
    __name__,
    "https://cdnjs.cloudflare.com/ajax/libs/echarts/4.6.0/echarts.min.js",
)


class EchartWidget(flx.Widget):
    echart_id = flx.StringProp(
        "_echart_id",
        settable=True,
        doc="""The unique id to distinguish this echart from other echarts""",
    )
    echart_options = flx.DictProp(
        {}, settable=True, doc="""the echarts options"""
    )
    echart_div_style = flx.StringProp(
        "width: 800px;height:400px;",
        settable=True,
        doc="""The style for the div which contain echart""",
    )

    def get_options(self):
        global window
        myChart = f"myChart_{self.echart_id}"
        return window[myChart]

    @flx.action
    def update_options(self, my_option):
        myChart = self.get_options()
        self._mutate_echart_options(my_option)
        myChart.setOption(self.echart_options)

    @flx.action
    def show_chart(self):
        myChart = self.get_options()
        myChart.setOption(self.echart_options)

    def _render_dom(self):
        global window
        node = [
            flx.create_element(
                "div",
                {"id": self.echart_id, "style": self.echart_div_style},
                "",
            ),
            flx.create_element(
                "script",
                {"type": "text/javascript"},
                f"""
                    // based on prepared DOM, initialize echarts instance
                    var myChart_{self.echart_id} = echarts.init(
                        document.getElementById('{self.echart_id}'));
                """,
            ),
        ]
        self.show_chart()
        return node


if __name__ == "__main__":

    class MyApp(flx.Widget):

        option1 = {
            "title": {"text": "ECharts entry example"},
            "tooltip": {},
            "legend": {"data": ["Sales"]},
            "xAxis": {
                "data": [
                    "shirt",
                    "cardign",
                    "chiffon",
                    "pants",
                    "heels",
                    "socks",
                ]
            },
            "yAxis": {},
            "series": [
                {"name": "Sales", "type": "bar", "data": [5, 2, 3, 1, 10, 8]}
            ],
        }

        option2 = {
            "series": [
                {
                    "name": "Customer Source",
                    "type": "pie",
                    "radius": "55%",
                    "data": [
                        {"value": 235, "name": "Video Ad."},
                        {"value": 274, "name": "Alignment Ad."},
                        {"value": 310, "name": "Email Marketing"},
                        {"value": 335, "name": "Direct"},
                        {"value": 400, "name": "Search Engine"},
                    ],
                    "roseType": "angle",
                    "itemStyle": {
                        "normal": {
                            # "shadowBlur": 200,
                            "shadowColor": "rgba(0, 0, 0, 0.5)",
                        }
                    },
                }
            ]
        }

        option3 = {
            "tooltip": {"formatter": "{a} <br/>{b} : {c}%"},
            "toolbox": {"feature": {"restore": {}, "saveAsImage": {}}},
            "series": [
                {
                    "name": "Business KPI",
                    "type": "gauge",
                    "detail": {"formatter": "{value}%"},
                    "data": [{"value": 50, "name": "Complete Rate"}],
                }
            ],
        }

        @flx.reaction("btn_change_chart.pointer_click")
        def change_chart(self):
            print("click button")
            # print(self.echart)
            # print(self.echart2)
            my_option = self.option1
            my_option["series"][0]["data"] = [1, 2, 3, 4, 5, 6]
            self.echart[0].update_options(my_option)

        def tick(self):
            global Math, window

            my_option2 = self.option2
            option2_value = (Math.random() * 400).toFixed(2) - 0
            my_option2["series"][0]["data"][0]["value"] = option2_value
            option2_value = (Math.random() * 400).toFixed(2) - 0
            my_option2["series"][0]["data"][1]["value"] = option2_value
            option2_value = (Math.random() * 400).toFixed(2) - 0
            my_option2["series"][0]["data"][3]["value"] = option2_value
            self.echart2[0].update_options(my_option2)

            option3_value = (Math.random() * 100).toFixed(2) - 0
            print("tick...", option3_value)
            my_option3 = self.option3
            my_option3["series"][0]["data"][0]["value"] = option3_value
            self.echart3[0].update_options(my_option3)

            window.setTimeout(self.tick, 1000)

        def init(self):
            super().init()
            with self:
                with flx.VBox():
                    self.echart = (
                        EchartWidget(
                            echart_id="any_unique_id",
                            echart_options=self.option1,
                        ),
                    )
                    with flx.HBox():
                        self.btn_change_chart = flx.Button(
                            text="Change Chart1"
                        )
                    with flx.HBox():
                        self.echart2 = (
                            EchartWidget(
                                echart_id="any_unique_id_2",
                                echart_div_style="width: 400px;height:400px;",
                                echart_options=self.option2,
                            ),
                        )
                        self.echart3 = (
                            EchartWidget(
                                echart_id="any_unique_id_3",
                                echart_div_style="width: 400px;height:400px;",
                                echart_options=self.option3,
                            ),
                        )
            # to dynamic change
            self.tick()

    app = flx.App(MyApp)
    # export to static SPA JS with a fiew files
    # app.export('c:/xampp/htdocs/demo/myapp/index.html')
    app.launch("chrome-app")
    flx.run()