Kendo Angular 条形图自定义应用渐变色

Question

我是 Kendo UI angular 的新手，我必须自定义一个条形图，其中每个条形图都有多种颜色渐变。 剑道可以达到吗？ 我的条形图是在融合中开发的，但我发现用剑道实现同样的效果并不困难。

附上了我需要实现的图像以及我在剑道中的代码是什么。

我在剑道中的代码

<kendo-chart style="height: 317px;">
    <kendo-chart-axis-defaults [majorGridLines]="{ visible : false}">
      </kendo-chart-axis-defaults>
      <kendo-chart-series-defaults type="bar">
          <kendo-chart-series-defaults-labels format="">
          </kendo-chart-series-defaults-labels>
      </kendo-chart-series-defaults>
    <kendo-chart-category-axis >
        <kendo-chart-category-axis-item [categories]="['jan','feb','mar','apr','may','jun','aug','set','oct','nov','dec']">
        </kendo-chart-category-axis-item>
    </kendo-chart-category-axis>
  <kendo-chart-series>                  
      <kendo-chart-value-axis>
          <kendo-chart-value-axis-item [line]="{visible:false}" labels="false">
          </kendo-chart-value-axis-item>
      </kendo-chart-value-axis>
    <kendo-chart-series-item 
      type="column"
      [color]="pointColor"
      [gap]="10"
      [stack]="true" 
      [data]="['1000','0','200','2000','1500','1000','0','200','2000','1500','3500','25']"
      >
      <kendo-chart-series-item-labels [content]="labelContent" rotation="90" [position]="end" >
        </kendo-chart-series-item-labels>
    </kendo-chart-series-item>
  </kendo-chart-series>
</kendo-chart>

Answer 1

要获得渐变效果，可以使用series属性overlay 。

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
    <kendo-chart>
      <kendo-chart-title text="Units sold"></kendo-chart-title>
      <kendo-chart-category-axis>
          <kendo-chart-category-axis-item [categories]="['Q1', 'Q2', 'Q3', 'Q4']">
          </kendo-chart-category-axis-item>
      </kendo-chart-category-axis>
      <kendo-chart-series>
        <kendo-chart-series-item type="bar" [gap]="2" [spacing]=".25" [data]="[100, 123, 234, 343]" [overlay]="{gradient: 'roundedBevel'}">
        </kendo-chart-series-item>
        <kendo-chart-series-item type="bar" [data]="[120, 67, 231, 196]" [overlay]="{gradient: 'glass'}" >
        </kendo-chart-series-item>
        <kendo-chart-series-item type="bar" [data]="[45, 124, 189, 143]" [overlay]="{gradient: 'none'}">
        </kendo-chart-series-item>
        <kendo-chart-series-item type="bar" [data]="[87, 154, 210, 215]" [overlay]="{gradient: 'sharpBevel'}">
        </kendo-chart-series-item>
      </kendo-chart-series>
    </kendo-chart>
  `
})
export class AppComponent {}

还遇到了这个演示 ，用于创建自定义线性渐变。 请参考下面的代码，我以创建线性梯度柱形图为例。

import { Component } from '@angular/core';
import { Surface, Path, Text, Group, Layout, LinearGradient, GradientOptions, ShapeOptions } from '@progress/kendo-drawing';
import { Arc as DrawingArc, GradientStop } from '@progress/kendo-drawing';
import { Arc, Rect, ArcOptions } from '@progress/kendo-drawing/geometry';
function createColumn(rect, color) {
            const origin = rect.origin;
            const bottomRight = rect.bottomRight();
            const gradient = new LinearGradient(<GradientOptions>{
                stops: [new GradientStop(0, "#98FB98", 1),
                        new GradientStop(0.5, color, 1)]
            });

              const path = Path.fromRect(rect, <ShapeOptions>{
                    fill: gradient,
                    stroke: {
                        color: color,
                        width: 1
                    }
                });

            const group = new Group();
            group.append(path);
            return group;
        }

@Component({
  selector: 'my-app',
  template: `
    <kendo-chart [seriesDefaults]="chartConfig.seriesDefaults" >
      <kendo-chart-title text="Units sold"></kendo-chart-title>
      <kendo-chart-category-axis>
          <kendo-chart-category-axis-item [categories]="['Q1', 'Q2', 'Q3', 'Q4']">
          </kendo-chart-category-axis-item>
      </kendo-chart-category-axis>
      <kendo-chart-series>
        <kendo-chart-series-item type="bar" [gap]="2" [spacing]=".25" [data]="[100, 123, 234, 343]" color="#008852">
        </kendo-chart-series-item>
      </kendo-chart-series>
    </kendo-chart>
  `
})
export class AppComponent {
public chartConfig = {
      seriesDefaults: {
          type: 'column',
          visual: function (e) {
              return createColumn(e.rect, e.options.color);
          }
      }
  };

}

Answer 2

查看您的图表，我认为可以通过100％堆叠的柱形图来实现，您可以获得彩色和灰色部分的数据。 然后使用可以显示并旋转的label属性。

<script>
$("#chart").kendoChart({
  series: [ {
    labels: {
      visible: true,
      position: "outsideEnd",
      rotation: 270 
    },
    data: [1, 2, 3]
  }]
});
</script>

尝试使用径向渐变和100％堆叠的条形图获得类似的条形图外观

import { Component } from '@angular/core';
import { Surface, Path, Text, Group, Layout, LinearGradient, RadialGradient, GradientOptions, ShapeOptions } from '@progress/kendo-drawing';
import { Arc as DrawingArc, GradientStop } from '@progress/kendo-drawing';
import { Arc, Rect, ArcOptions } from '@progress/kendo-drawing/geometry';
function createColumn(rect, color) {
            const origin = rect.origin;
            const bottomRight = rect.bottomRight();

            const radialgradient = new RadialGradient(<GradientOptions>{
               center:[0.5, 0],
                stops: [new GradientStop(0.5, color, 1),
                        new GradientStop(1, "#98FB98", 1)]
            });

            const path = Path.fromRect(rect, <ShapeOptions>{
                    fill: radialgradient,
                    stroke: {
                        color: color,
                        width: 1
                    }
                });

              const path1 = Path.fromRect(rect, <ShapeOptions>{
                    fill: {color: color},
                    stroke: {
                        color: color,
                        width: 1
                    }
                });

            const group = new Group();
            if(color == "#eee"){
                group.append(path1);
            }
            else{
                group.append(path);
            }

            return group;
        }

@Component({
  selector: 'my-app',
  template: `
    <kendo-chart [seriesDefaults]="chartConfig.seriesDefaults" >
      <kendo-chart-title text="Units sold"></kendo-chart-title>
      <kendo-chart-category-axis>
          <kendo-chart-category-axis-item [categories]="['Q1', 'Q2', 'Q3', 'Q4']">
          </kendo-chart-category-axis-item>
      </kendo-chart-category-axis>
      <kendo-chart-series>
        <kendo-chart-series-item type="column" [stack]="{ type: '100%' }" [gap]="2" [spacing]=".25" [data]="[100, 120, 250, 345]" color="#008852">
        </kendo-chart-series-item>
         <kendo-chart-series-item type="column" [data]="[400, 380, 250, 155]" color="#eee">
        </kendo-chart-series-item>
      </kendo-chart-series>
    </kendo-chart>
  `
})
export class AppComponent {
public chartConfig = {
      seriesDefaults: {
          visual: function (e) {
              return createColumn(e.rect, e.options.color);
          }
      }
  };

}

Answer 3

我发现它们公开了允许您控制每个条的呈现方式的钩子。 使用seriesDefaults<\/code> -chart 上的seriesDefaults<\/code>属性，您可以提供自己的visual()<\/code>方法。 脚步：

1. 在您的模板中，绑定到 seriesDefaults：<\/li><\/ol>

   在您的组件中，在 seriesDefaults 上提供自定义可视化方法：<\/li><\/ol>
    seriesDefaults: SeriesDefaults = { type: 'column', visual: (e: SeriesVisualArgs) => createColumn(e.rect, e.options.color, e.dataItem), };<\/code><\/pre>
                        
                 
    
                  
    自定义方法可能看起来像这样。 可选地，我在每个栏上方添加了一个文本项以显示 dataItem 值（这很粗糙，我正在假设它的 x\/y 位置）：<\/li><\/ol>
    export function createColumn(rect: geometry.Rect, color: string, dataItem: number): Group { const gradient = new LinearGradient(<GradientOptions>{ stops: [new GradientStop(0, color, 0.7), new GradientStop(0.4, color, 1)], }); gradient.start([0.5, 0]); gradient.end([0.5, 1]); \/\/ Turn the rect into a path and reference the gradient const path = Path.fromRect(rect, <ShapeOptions>{ fill: gradient, stroke: { color: '#777', width: 1, }, }); \/\/ Add the dataItem value above the bar const position = rect.topLeft(); position.y -= 13; position.x += (rect.width() \/ 2) - 10; const text = new Text(dataItem + '', position); const group = new Group(); group.append(path); group.append(text); return group; } ``` [![Results][1]][1] [1]: https:\/\/i.stack.imgur.com\/wVOmQ.png<\/code><\/pre>"