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Backend API
@model IEnumerable<DevExtreme.NETCore.Demos.Models.MedalAnnotationInfo>
@(Html.DevExtreme().PieChart()
.ID("pie")
.Palette(VizPalette.Vintage)
.Title("Ice Hockey World Championship Gold Medal Winners")
.CommonAnnotationSettings(ca => ca
.Type(AnnotationType.Image)
.PaddingLeftRight(0)
.PaddingTopBottom(0)
.TooltipTemplate(@<text>
<div class='medal-tooltip'>
<div class='country-name'>
<%- data.Country %><% if(data.OldCountryName) { %>
<br /><%- data.OldCountryName %>
<% } %>
</div>
<div class='gold'>
<span class='caption'>Gold</span>: <%- data.Gold %>
</div>
<div class='silver'>
<span class='caption'>Silver</span>: <%- data.Silver %>
</div>
<div class='bronze'>
<span class='caption'>Bronze</span>: <%- data.Bronze %>
</div>
</div>
</text>)
.Image(i => i
.Height(60)
.Width(90)
)
)
.Annotations(a => {
foreach(var annotation in Model) {
a.Add()
.Argument(annotation.Country)
.Image(annotation.Image)
.Data(annotation.Data)
.Location(annotation.Location)
.OffsetX(new JS(annotation.OffsetX.HasValue
? annotation.OffsetX.Value.ToString()
: JS.Undefined.ToString()))
.OffsetY(new JS(annotation.OffsetY.HasValue
? annotation.OffsetY.Value.ToString()
: JS.Undefined.ToString()))
.Color(annotation.Color)
.Border(b => b.Color(annotation.BorderColor))
.Shadow(s => s.Opacity(
new JS(annotation.ShadowOpacity.HasValue
? annotation.ShadowOpacity.Value.ToString()
: JS.Undefined.ToString())));
}
})
.Series(s =>
s.Add()
.ArgumentField("Country")
.ValueField("Gold")
.Label(l => l
.Visible(true)
.Position(PieChartLabelPosition.Inside)
.RadialOffset(83)
.BackgroundColor("transparent")
.Font(f => f
.Size(16)
.Weight(600)
)
)
)
.Tooltip(t => t
.PaddingLeftRight(12)
.PaddingTopBottom(10)
)
.Legend(l => l.Visible(false))
.DataSource(Model.Select(d => d.Data))
)
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.NETCore.Demos.Models;
using DevExtreme.NETCore.Demos.Models.SampleData;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Controllers {
public class ChartsController : Controller {
public ActionResult PieWithAnnotations() {
return View(SampleData.GetAnnotationsInfo());
}
}
}
using System.Collections.Generic;
namespace DevExtreme.NETCore.Demos.Models.SampleData {
public partial class SampleData {
public static readonly IEnumerable<MedalistData> IceHockeyGoldMedalistsData = new[] {
new MedalistData {
Country = "Russia",
OldCountryName = "Soviet Union",
Gold = 27,
Silver = 10,
Bronze = 10
},
new MedalistData {
Country = "Canada",
Gold = 26,
Silver = 15,
Bronze = 9
},
new MedalistData {
Country = "Czech Republic",
OldCountryName = "Czechoslovakia",
Gold = 12,
Silver = 13,
Bronze = 21
},
new MedalistData {
Country = "Sweden",
Gold = 11,
Silver = 19,
Bronze = 17
},
new MedalistData {
Country = "Finland",
Gold = 3,
Silver = 8,
Bronze = 3
},
new MedalistData {
Country = "United States",
Gold = 2,
Silver = 9,
Bronze = 8
},
new MedalistData {
Country = "Great Britain",
Gold = 1,
Silver = 2,
Bronze = 2
},
new MedalistData {
Country = "Slovakia",
Gold = 1,
Silver = 2,
Bronze = 1
}
};
}
}
using System;
using DevExtreme.AspNet.Mvc;
namespace DevExtreme.NETCore.Demos.Models {
public class MedalAnnotationInfo {
public string Country { get; set; }
public string Image { get; set; }
public object Data { get; set; }
public PieChartAnnotationLocation Location { get; set; }
public double? OffsetX { get; set; }
public double? OffsetY { get; set; }
public string Color { get; set; }
public string BorderColor { get; set; }
public double? ShadowOpacity { get; set; }
public MedalAnnotationInfo ShallowCopy() {
return (MedalAnnotationInfo)this.MemberwiseClone();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using DevExtreme.AspNet.Mvc;
namespace DevExtreme.NETCore.Demos.Models.SampleData {
public partial class SampleData {
public static readonly MedalAnnotationInfo[] AnnotationItems = new[] {
new MedalAnnotationInfo {
Country = "Russia",
OffsetX = 15,
OffsetY = 5
},
new MedalAnnotationInfo {
Country = "Canada",
OffsetY = 10
},
new MedalAnnotationInfo {
Country = "Czech Republic",
OffsetX = -5,
OffsetY = -35
},
new MedalAnnotationInfo {
Country = "Sweden",
OffsetX = 20,
OffsetY = -25
},
new MedalAnnotationInfo {
Country = "Finland",
Location = PieChartAnnotationLocation.Edge,
OffsetX = 45,
OffsetY = -85
},
new MedalAnnotationInfo {
Country = "United States",
Location = PieChartAnnotationLocation.Edge,
OffsetX = 85,
OffsetY = -45
},
new MedalAnnotationInfo {
Country = "Great Britain",
Location = PieChartAnnotationLocation.Edge,
OffsetX = 81,
OffsetY = 15
},
new MedalAnnotationInfo {
Country = "Slovakia",
Location = PieChartAnnotationLocation.Edge,
OffsetX = 45,
OffsetY = 80
}
};
public static IEnumerable<MedalAnnotationInfo> GetAnnotationsInfo() {
int annotationsCount = AnnotationItems.Count();
MedalAnnotationInfo[] annotations = new MedalAnnotationInfo[annotationsCount];
for(int i = 0; i < annotationsCount; i++) {
MedalAnnotationInfo newAnnotation = AnnotationItems[i].ShallowCopy();
string country = newAnnotation.Country;
bool isEdgePosition = newAnnotation.Location == PieChartAnnotationLocation.Edge;
MedalistData championData = IceHockeyGoldMedalistsData.First(m => m.Country == country);
newAnnotation.Image = string.Format("../../images/flags/3x2/{0}.svg", country.Replace(" ", String.Empty));
newAnnotation.Data = new {
championData.Country,
championData.OldCountryName,
championData.Gold,
championData.Silver,
championData.Bronze
};
newAnnotation.Color = isEdgePosition ? "#aaaaaa" : "transparent";
newAnnotation.BorderColor = isEdgePosition ? "#aaaaaa" : "transparent";
if(isEdgePosition) {
newAnnotation.ShadowOpacity = 0.3;
}
annotations[i] = newAnnotation;
}
return annotations;
}
}
}
using System;
namespace DevExtreme.NETCore.Demos.Models {
public class MedalistData {
public string Country { get; set; }
public string OldCountryName { get; set; }
public int Gold { get; set; }
public int Silver { get; set; }
public int Bronze { get; set; }
}
}
#pie {
height: 440px;
}
.medal-tooltip {
font-size: 12px;
}
.medal-tooltip .country-name {
font-size: 14px;
font-weight: 700;
margin: 5px 0px 10px 0px;
}
.medal-tooltip .caption {
font-weight: 600;
}
You can set each annotation type property to "text", "image", or "custom". In this demo, the type used for all annotations is "image".
Annotations can deliver more information if you add tooltips. A tooltip appears when users hover the mouse pointer over an annotation. This demo illustrates how you can implement a tooltip with custom content via the tooltipTemplate property.
For more information on annotation settings, refer to the annotations[] help topic.