Kendo Ui-动态设置图表中的颜色答案

【问题标题】：Kendoui- set color in chart dynamicallyKendo Ui-动态设置图表中的颜色
【发布时间】：2016-02-01 20:52:51
【问题描述】：

当我们使用 KendoUI 时，我们需要指定图表的背景颜色。像这样：

{
      category: "Latin America",
      value: 16.3,
      color: "#068c35"
}

请参阅下面的完整代码或示例here。我想知道，不是为每个组件指定背景色，而是可以设置基色，然后 kendoui 将使用基色的变化并为剩余组件设置背景色。

<!DOCTYPE html>
<html>
<head>
    <base href="http://demos.telerik.com/kendo-ui/donut-charts/index">
    <style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
    <title></title>
    <link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.common-material.min.css" />
    <link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.material.min.css" />

    <script src="//kendo.cdn.telerik.com/2016.1.112/js/jquery.min.js"></script>
    <script src="//kendo.cdn.telerik.com/2016.1.112/js/kendo.all.min.js"></script>
</head>
<body>
<div id="example">
    <div class="demo-section k-content wide">
        <div id="chart" style="background: center no-repeat url('../content/shared/styles/world-map.png');"></div>
    </div>
    <script>
        function createChart() {
            $("#chart").kendoChart({
                title: {
                    position: "bottom",
                    text: "Share of Internet Population Growth"
                },
                legend: {
                    visible: false
                },
                chartArea: {
                    background: ""
                },
                seriesDefaults: {
                    type: "donut",
                    startAngle: 150
                },
                series: [{
                    name: "2011",
                    data: [{
                        category: "Asia",
                        value: 30.8,
                        color: "#9de219"
                    },{
                        category: "Europe",
                        value: 21.1,
                        color: "#90cc38"
                    },{
                        category: "Latin America",
                        value: 16.3,
                        color: "#068c35"
                    },{
                        category: "Africa",
                        value: 17.6,
                        color: "#006634"
                    },{
                        category: "Middle East",
                        value: 9.2,
                        color: "#004d38"
                    },{
                        category: "North America",
                        value: 4.6,
                        color: "#033939"
                    }]
                }, {
                    name: "2012",
                    data: [{
                        category: "Asia",
                        value: 53.8,
                        color: "#9de219"
                    },{
                        category: "Europe",
                        value: 16.1,
                        color: "#90cc38"
                    },{
                        category: "Latin America",
                        value: 11.3,
                        color: "#068c35"
                    },{
                        category: "Africa",
                        value: 9.6,
                        color: "#006634"
                    },{
                        category: "Middle East",
                        value: 5.2,
                        color: "#004d38"
                    },{
                        category: "North America",
                        value: 3.6,
                        color: "#033939"
                    }],
                    labels: {
                        visible: true,
                        background: "transparent",
                        position: "outsideEnd",
                        template: "#= category #: \n #= value#%"
                    }
                }],
                tooltip: {
                    visible: true,
                    template: "#= category # (#= series.name #): #= value #%"
                }
            });
        }

        $(document).ready(createChart);
        $(document).bind("kendo:skinChange", createChart);
    </script>
</div>


</body>
</html>

【问题讨论】：

标签： kendo-ui dojo telerik kendo-chart

【解决方案1】：

根据@ademar 的回答，我更新了solution

这就是GetColor 函数的样子

 var color = "#2b577011";
      var percent = -20;
      function GetColor(val)
      {
            var R = parseInt(color.substring(1,3),16);
            var G = parseInt(color.substring(3,5),16);
            var B = parseInt(color.substring(5,7),16);

            R = parseInt(R * (100 + percent) / 100);
            G = parseInt(G * (100 + percent) / 100);
            B = parseInt(B * (100 + percent) / 100);

            R = (R<255)?R:255;  
            G = (G<255)?G:255;  
            B = (B<255)?B:255;  

            var RR = ((R.toString(16).length==1)?"0"+R.toString(16):R.toString(16));
            var GG = ((G.toString(16).length==1)?"0"+G.toString(16):G.toString(16));
            var BB = ((B.toString(16).length==1)?"0"+B.toString(16):B.toString(16));

            color = "#"+RR+GG+BB;
            return color;
      }

这里是完整的代码：

<!DOCTYPE html>
<html>
<head>
    <base href="http://demos.telerik.com/kendo-ui/donut-charts/index">
    <style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
    <title></title>
    <link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.common-material.min.css" />
    <link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.material.min.css" />

    <script src="//kendo.cdn.telerik.com/2016.1.112/js/jquery.min.js"></script>
    <script src="//kendo.cdn.telerik.com/2016.1.112/js/kendo.all.min.js"></script>
</head>
<body>
<div id="example">
    <div class="demo-section k-content wide">
        <div id="chart" style="background: center no-repeat url('../content/shared/styles/world-map.png');"></div>
    </div>
    <script>
        function createChart() {
            $("#chart").kendoChart({
                title: {
                    position: "bottom",
                    text: "Share of Internet Population Growth"
                },
                legend: {
                    visible: false
                },
                chartArea: {
                    background: ""
                },
                seriesDefaults: {
                    type: "donut",
                    startAngle: 150
                },
                series: [{
                    name: "2012",
                    data: [{
                        category: "Asia",
                        value: 53.8,
                        color: GetColor
                    },{
                        category: "Europe",
                        value: 16.1,
                        color: GetColor
                    },{
                        category: "Latin America",
                        value: 11.3,
                        color: GetColor
                    },{
                        category: "Africa",
                        value: 9.6,
                        color: GetColor
                    },{
                        category: "Middle East",
                        value: 5.2,
                        color:GetColor
                    },{
                        category: "North America",
                        value: 3.6,
                        color: GetColor
                    }],
                    labels: {
                        visible: true,
                        background: "transparent",
                        position: "outsideEnd",
                        template: "#= category #: \n #= value#%"
                    }
                }],
                tooltip: {
                    visible: true,
                    template: "#= category # (#= series.name #): #= value #%"
                }
            });
        }

        $(document).ready(createChart);
        $(document).bind("kendo:skinChange", createChart);

      var color = "#63C6FF";
      var percent = -20;
      function GetColor(val)
      {

            var R = parseInt(color.substring(1,3),16);
            var G = parseInt(color.substring(3,5),16);
            var B = parseInt(color.substring(5,7),16);

            R = parseInt(R * (100 + percent) / 100);
            G = parseInt(G * (100 + percent) / 100);
            B = parseInt(B * (100 + percent) / 100);

            R = (R<255)?R:255;  
            G = (G<255)?G:255;  
            B = (B<255)?B:255;  

            var RR = ((R.toString(16).length==1)?"0"+R.toString(16):R.toString(16));
            var GG = ((G.toString(16).length==1)?"0"+G.toString(16):G.toString(16));
            var BB = ((B.toString(16).length==1)?"0"+B.toString(16):B.toString(16));

            color = "#"+RR+GG+BB;
            return color;
      }
    </script>
</div>


</body>
</html>

【讨论】：

这段代码对我来说毫无意义——GetColor 方法采用了一个参数val，它莫名其妙地从未使用过

【解决方案2】：

你可以在那里使用js函数和逻辑。

{
    category: "Africa",
    value: 17.6,
    color: GetColor
}

example here

这就是你要找的吗？

【讨论】：

它接近我想要的，但我希望只指定一种基色。并且基于该颜色，系统应该为剩余的组件选择颜色。目前您已经指定了多种颜色（红色、蓝色、绿色）。如果您能解释这是如何工作的，那就太好了。投票选出有用的答案！！
好吧，它是如何工作的：有一个带颜色的数组（索引 0,1 和 2）。每次调用它时，我都会执行 3 的模运算（因此它总是会在数组的边界返回数字）以返回一个值和递增变量。正如您在问题帖子中发布的那样，可以在字符串中指定剑道中的颜色属性。所以函数只是返回 kendo 可接受的字符串中的颜色......对于你的基本颜色功能：我不明白你的意思。指定例如绿色，然后为每个“馅饼的一部分”生成更少的绿色和更少的绿色？基于价值还是随机？