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Backend API
@(Html.DevExtreme().PieChart()
.ID("pie")
.CustomizePoint("customizePoint")
.Series(s => s.Add()
.ValueField("Value")
.ArgumentField("Type")
.Label(l => l
.Visible(true)
.Connector(c => c
.Visible(true)
)
.CustomizeText("customizeText")
)
)
.Export(e => e.Enabled(true))
.DataSource(new[] {
new { Type = "Stripes", Value = 1 },
new { Type = "Grid", Value = 1 },
new { Type = "Linear Gradient", Value = 1 },
new { Type = "Radial Gradient", Value = 1 },
new { Type = "Image", Value = 1 }
})
)
<script>
var registerGradient = DevExpress.common.charts.registerGradient;
var registerPattern = DevExpress.common.charts.registerPattern;
var imagePatternSize = 12;
var shapePatternSize = 6;
function customizeText(info) {
return info.argument;
}
function customizePoint(point) {
var color = point.series.getPointsByArg(point.argument)[0].getColor();
var fillId;
switch (point.argument) {
case 'Stripes':
fillId = getStrokePattern(color);
break;
case 'Grid':
fillId = getSquarePattern(color);
break;
case 'Linear Gradient':
fillId = getLinearGradient(color);
break;
case 'Radial Gradient':
fillId = getRadialGradient(color);
break;
case 'Image':
fillId = getPatternImage(color);
break;
default:
break;
}
return { color: { fillId } };
}
function hexToRgb(hex, opacity = 1) {
const hexColorParts = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return `rgba(${parseInt(hexColorParts[1], 16)}, ${parseInt(hexColorParts[2], 16)}, ${parseInt(hexColorParts[3], 16)}, ${opacity})`;
}
function getGradient(type, color1, color2) {
return registerGradient(type, {
colors: [{
offset: '20%',
color: color1,
}, {
offset: '90%',
color: color2,
}],
});
}
function getLinearGradient(color) { return getGradient('linear', color, hexToRgb(color, 0.5)); }
function getRadialGradient(color) { return getGradient('radial', hexToRgb(color, 0.5), color); }
function getPatternImage(color) {
return registerPattern({
width: imagePatternSize,
height: imagePatternSize,
template: (container) => {
const rect = createRect(imagePatternSize, color);
const image = document.createElementNS('http://www.w3.org/2000/svg', 'image');
image.setAttribute('x', 0);
image.setAttribute('y', 0);
image.setAttribute('width', imagePatternSize);
image.setAttribute('height', imagePatternSize);
image.setAttribute('href', '../../Content/images/Charts/PieWithCustomStyles/diamond.svg');
image.setAttribute('opacity', '0.6');
container.appendChild(rect);
container.appendChild(image);
},
});
}
function getStrokePattern(color) {
return registerPattern({
width: shapePatternSize,
height: shapePatternSize,
template: (container) => {
const halfSize = shapePatternSize / 2;
const oneAndAHalfSize = shapePatternSize * 1.5;
const d = `M ${halfSize} ${-halfSize} L ${-halfSize} ${halfSize} M 0 ${shapePatternSize} L ${shapePatternSize} 0 M ${oneAndAHalfSize} ${halfSize} L ${halfSize} ${oneAndAHalfSize}`;
const path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
path.setAttribute('stroke', color);
path.setAttribute('stroke-width', 2);
path.setAttribute('d', d);
container.appendChild(path);
},
});
}
function getSquarePattern(color) {
return registerPattern({
width: shapePatternSize,
height: shapePatternSize,
template: (container) => {
const rect = createRect(shapePatternSize, null, color, 2);
container.appendChild(rect);
},
});
}
function createRect(size, fill, stroke, strokeWidth) {
const rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
rect.setAttribute('x', 0);
rect.setAttribute('y', 0);
rect.setAttribute('width', size);
rect.setAttribute('height', size);
rect.setAttribute('fill', fill);
rect.setAttribute('stroke', stroke);
rect.setAttribute('stroke-width', strokeWidth);
return rect;
}
</script>
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.MVC.Demos.Models.SampleData;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
namespace DevExtreme.MVC.Demos.Controllers {
public class ChartsController : Controller {
public ActionResult PieWithCustomStyles() {
return View();
}
}
}
#pie {
height: 440px;
}
Gradient
Call the registerGradient() method to obtain a gradient ID. Specify method arguments as follows:
-
type
This method supports two gradient types: 'linear' and 'radial'. -
options
An object for gradient options.-
colors
An array of gradient colors. Each color is an object that includescolorandoffsetfields. Theoffsetfield specifies the starting point for each color. -
rotationAngle(linear gradients only)
You can use this option to rotate linear gradients.
-
Pattern
To obtain a pattern ID, call the registerPattern() method. Specify method arguments as follows:
-
options
An object with pattern options.-
height
Template height. -
width
Template width. -
template
A repeating SVG-based template that creates the required pattern.
-
Fill the PieChart
To fill all slices with the same pattern or gradient, assign a pattern ID to series.color.fillId. If you want to customize each slice individually, implement the customizePoint function (review this demo for more information).
Custom patterns and gradients are not limited to the PieChart. The following DevExtreme components support the use of patterns/gradients: