Blazor Sankey Diagram: Printing and Exporting

16 Dec 202415 minutes to read

This guide explains how to print and export the Blazor Sankey Diagram using its built-in functionalities. These features allow you to generate high-quality output for presentations, reports, or further analysis.

Printing the Sankey Diagram

The Sankey Diagram offers a convenient way to print its contents directly from the browser. The PrintAsync method triggers the browser’s print dialog, allowing users to select printing options and target printers. Note that the availability and appearance of print options depend on the user’s browser and operating system.

RAZOR

@using Syncfusion.Blazor;
@using Syncfusion.Blazor.Sankey;

<div style="background-color: @_backgroundColor; padding: 20px;">
    <div>
        <SfSankey @ref="sankey" BackgroundColor="@_backgroundColor" Nodes=@Nodes Links=@Links>
            <SankeyNodeSettings Color="#1c3f60" Width="10" Padding="20"></SankeyNodeSettings>
            <SankeyLinkSettings Color="#afc1d0" Opacity="0.2"></SankeyLinkSettings>
            <SankeyLabelSettings Color="#FFFFFF" FontWeight="400"></SankeyLabelSettings>
            <SankeyLegendSettings Visible="false"></SankeyLegendSettings>
        </SfSankey>
    </div>
    <div>
        <button class="btn btn-secondary" @onclick="PrintSankey">Print Sankey</button>
    </div>
</div>
@code {
    SfSankey sankey;
    string _backgroundColor = "#0b1320";
    public List<SankeyDataNode> Nodes = new List<SankeyDataNode>();
    public List<SankeyDataLink> Links = new List<SankeyDataLink>();        

    private async Task PrintSankey()
    {
        await sankey.PrintAsync();
    }
    protected override void OnInitialized()
    {
        Nodes = new List<SankeyDataNode>()
        {
            new SankeyDataNode() { Id = "Solar", Label = new SankeyDataLabel() { Text = "Solar" } },
            new SankeyDataNode() { Id = "Wind", Label = new SankeyDataLabel() { Text = "Wind" } },
            new SankeyDataNode() { Id = "Hydro", Label = new SankeyDataLabel() { Text = "Hydro" } },
            new SankeyDataNode() { Id = "Nuclear", Label = new SankeyDataLabel() { Text = "Nuclear" } },
            new SankeyDataNode() { Id = "Coal", Label = new SankeyDataLabel() { Text = "Coal" } },
            new SankeyDataNode() { Id = "Natural Gas", Label = new SankeyDataLabel() { Text = "Natural Gas" } },
            new SankeyDataNode() { Id = "Oil", Label = new SankeyDataLabel() { Text = "Oil" } },
            new SankeyDataNode() { Id = "Electricity", Label = new SankeyDataLabel() { Text = "Electricity" } },
            new SankeyDataNode() { Id = "Heat", Label = new SankeyDataLabel() { Text = "Heat" } },
            new SankeyDataNode() { Id = "Fuel", Label = new SankeyDataLabel() { Text = "Fuel" } },
            new SankeyDataNode() { Id = "Residential", Label = new SankeyDataLabel() { Text = "Residential" } },
            new SankeyDataNode() { Id = "Commercial", Label = new SankeyDataLabel() { Text = "Commercial" } },
            new SankeyDataNode() { Id = "Industrial", Label = new SankeyDataLabel() { Text = "Industrial" } },
            new SankeyDataNode() { Id = "Transportation", Label = new SankeyDataLabel() { Text = "Transportation" } },
            new SankeyDataNode() { Id = "Energy Services", Label = new SankeyDataLabel() { Text = "Energy Services" } },
            new SankeyDataNode() { Id = "Losses", Label = new SankeyDataLabel() { Text = "Losses" } }
        };

        Links = new List<SankeyDataLink>()
        {
            // Energy Sources to Carriers
            new SankeyDataLink() { SourceId = "Solar", TargetId = "Electricity", Value = 100 },
            new SankeyDataLink() { SourceId = "Wind", TargetId = "Electricity", Value = 120 },
            new SankeyDataLink() { SourceId = "Hydro", TargetId = "Electricity", Value = 80 },
            new SankeyDataLink() { SourceId = "Nuclear", TargetId = "Electricity", Value = 90 },
            new SankeyDataLink() { SourceId = "Coal", TargetId = "Electricity", Value = 200 },
            new SankeyDataLink() { SourceId = "Natural Gas", TargetId = "Electricity", Value = 130 },
            new SankeyDataLink() { SourceId = "Natural Gas", TargetId = "Heat", Value = 80 },
            new SankeyDataLink() { SourceId = "Oil", TargetId = "Fuel", Value = 250 },

            // Energy Carriers to Sectors
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Residential", Value = 170 },
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Commercial", Value = 160 },
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Industrial", Value = 210 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Residential", Value = 40 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Commercial", Value = 20 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Industrial", Value = 20 },
            new SankeyDataLink() { SourceId = "Fuel", TargetId = "Transportation", Value = 200 },
            new SankeyDataLink() { SourceId = "Fuel", TargetId = "Industrial", Value = 50 },

            // Sectors to End Use and Losses
            new SankeyDataLink() { SourceId = "Residential", TargetId = "Energy Services", Value = 180 },
            new SankeyDataLink() { SourceId = "Commercial", TargetId = "Energy Services", Value = 150 },
            new SankeyDataLink() { SourceId = "Industrial", TargetId = "Energy Services", Value = 230 },
            new SankeyDataLink() { SourceId = "Transportation", TargetId = "Energy Services", Value = 150 },
            new SankeyDataLink() { SourceId = "Residential", TargetId = "Losses", Value = 30 },
            new SankeyDataLink() { SourceId = "Commercial", TargetId = "Losses", Value = 30 },
            new SankeyDataLink() { SourceId = "Industrial", TargetId = "Losses", Value = 50 },
            new SankeyDataLink() { SourceId = "Transportation", TargetId = "Losses", Value = 50 }
        };
        base.OnInitialized();
    }
}

Exporting the Sankey Diagram

The Sankey Diagram can be exported to various image formats, including PNG, JPEG, SVG, and PDF. The ExportAsync method handles the export process. You provide the desired file name and format as arguments. The exported image will reflect the current state of the chart, including any customizations or user interactions.

RAZOR

@using Syncfusion.Blazor;
@using Syncfusion.Blazor.Sankey;

<div style="background-color: @_backgroundColor; padding: 20px;">
    <div>
        <SfSankey @ref="sankey" BackgroundColor="@_backgroundColor" Nodes=@Nodes Links=@Links>
            <SankeyNodeSettings Color="#1c3f60" Width="10" Padding="20"></SankeyNodeSettings>
            <SankeyLinkSettings Color="#afc1d0" Opacity="0.2"></SankeyLinkSettings>
            <SankeyLabelSettings Color="#FFFFFF" FontWeight="400"></SankeyLabelSettings>
            <SankeyLegendSettings Visible="false"></SankeyLegendSettings>
        </SfSankey>
    </div>
    <div>
        <button class="btn btn-secondary" @onclick="ExportSankey">Export Sankey</button>
    </div>
</div>
@code {
    SfSankey sankey;
    string _backgroundColor = "#0b1320";
    public List<SankeyDataNode> Nodes = new List<SankeyDataNode>();
    public List<SankeyDataLink> Links = new List<SankeyDataLink>();  

    private async Task ExportSankey()
    {
        await sankey.ExportAsync(SankeyExportType.PNG, $"Sankey{DateTime.Now.Ticks}", null, true, false);
    }
    protected override void OnInitialized()
    {
        Nodes = new List<SankeyDataNode>()
        {
            new SankeyDataNode() { Id = "Solar", Label = new SankeyDataLabel() { Text = "Solar" } },
            new SankeyDataNode() { Id = "Wind", Label = new SankeyDataLabel() { Text = "Wind" } },
            new SankeyDataNode() { Id = "Hydro", Label = new SankeyDataLabel() { Text = "Hydro" } },
            new SankeyDataNode() { Id = "Nuclear", Label = new SankeyDataLabel() { Text = "Nuclear" } },
            new SankeyDataNode() { Id = "Coal", Label = new SankeyDataLabel() { Text = "Coal" } },
            new SankeyDataNode() { Id = "Natural Gas", Label = new SankeyDataLabel() { Text = "Natural Gas" } },
            new SankeyDataNode() { Id = "Oil", Label = new SankeyDataLabel() { Text = "Oil" } },
            new SankeyDataNode() { Id = "Electricity", Label = new SankeyDataLabel() { Text = "Electricity" } },
            new SankeyDataNode() { Id = "Heat", Label = new SankeyDataLabel() { Text = "Heat" } },
            new SankeyDataNode() { Id = "Fuel", Label = new SankeyDataLabel() { Text = "Fuel" } },
            new SankeyDataNode() { Id = "Residential", Label = new SankeyDataLabel() { Text = "Residential" } },
            new SankeyDataNode() { Id = "Commercial", Label = new SankeyDataLabel() { Text = "Commercial" } },
            new SankeyDataNode() { Id = "Industrial", Label = new SankeyDataLabel() { Text = "Industrial" } },
            new SankeyDataNode() { Id = "Transportation", Label = new SankeyDataLabel() { Text = "Transportation" } },
            new SankeyDataNode() { Id = "Energy Services", Label = new SankeyDataLabel() { Text = "Energy Services" } },
            new SankeyDataNode() { Id = "Losses", Label = new SankeyDataLabel() { Text = "Losses" } }
        };

        Links = new List<SankeyDataLink>()
        {
            // Energy Sources to Carriers
            new SankeyDataLink() { SourceId = "Solar", TargetId = "Electricity", Value = 100 },
            new SankeyDataLink() { SourceId = "Wind", TargetId = "Electricity", Value = 120 },
            new SankeyDataLink() { SourceId = "Hydro", TargetId = "Electricity", Value = 80 },
            new SankeyDataLink() { SourceId = "Nuclear", TargetId = "Electricity", Value = 90 },
            new SankeyDataLink() { SourceId = "Coal", TargetId = "Electricity", Value = 200 },
            new SankeyDataLink() { SourceId = "Natural Gas", TargetId = "Electricity", Value = 130 },
            new SankeyDataLink() { SourceId = "Natural Gas", TargetId = "Heat", Value = 80 },
            new SankeyDataLink() { SourceId = "Oil", TargetId = "Fuel", Value = 250 },

            // Energy Carriers to Sectors
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Residential", Value = 170 },
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Commercial", Value = 160 },
            new SankeyDataLink() { SourceId = "Electricity", TargetId = "Industrial", Value = 210 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Residential", Value = 40 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Commercial", Value = 20 },
            new SankeyDataLink() { SourceId = "Heat", TargetId = "Industrial", Value = 20 },
            new SankeyDataLink() { SourceId = "Fuel", TargetId = "Transportation", Value = 200 },
            new SankeyDataLink() { SourceId = "Fuel", TargetId = "Industrial", Value = 50 },

            // Sectors to End Use and Losses
            new SankeyDataLink() { SourceId = "Residential", TargetId = "Energy Services", Value = 180 },
            new SankeyDataLink() { SourceId = "Commercial", TargetId = "Energy Services", Value = 150 },
            new SankeyDataLink() { SourceId = "Industrial", TargetId = "Energy Services", Value = 230 },
            new SankeyDataLink() { SourceId = "Transportation", TargetId = "Energy Services", Value = 150 },
            new SankeyDataLink() { SourceId = "Residential", TargetId = "Losses", Value = 30 },
            new SankeyDataLink() { SourceId = "Commercial", TargetId = "Losses", Value = 30 },
            new SankeyDataLink() { SourceId = "Industrial", TargetId = "Losses", Value = 50 },
            new SankeyDataLink() { SourceId = "Transportation", TargetId = "Losses", Value = 50 }
        };
        base.OnInitialized();
    }
}

Key Considerations

• Print Functionality: The print feature relies on the browser’s print capabilities. Ensure users have the necessary printer drivers and browser settings configured.

• Export Formats: Choose the appropriate export format based on your needs. PNG and JPEG are suitable for raster images, while SVG and PDF are vector formats that offer scalability without loss of quality.

• File Names: Provide meaningful file names to help users organize and identify exported charts.

• Event Handling: The PrintCompleted and ExportCompleted events can be used to notify the user or perform actions after the respective operations finish. See the Events section of the Sankey Diagram documentation for more details.

See also

• Nodes
• Links
• Labels