Heatmap
TsgcHTMLComponent_Heatmap — render a colour-scaled SVG heatmap grid from cell values or a bound dataset, with legend and row/column labels, in Delphi, C++ Builder and .NET.
TsgcHTMLComponent_Heatmap — render a colour-scaled SVG heatmap grid from cell values or a bound dataset, with legend and row/column labels, in Delphi, C++ Builder and .NET.
Set row and column labels, fill cells with SetCell (or bind a dataset), then read the HTML property.
TsgcHTMLComponent_Heatmap
Inline SVG heatmap grid + optional legend (no chart library)
Delphi, C++ Builder, .NET
Populate RowLabels and ColumnLabels, call SetCell(aRow, aCol, aValue) for each data point (or bind a dataset), then read HTML.
uses
sgcHTML_Component_Heatmap;
var
oHeatmap: TsgcHTMLComponent_Heatmap;
begin
oHeatmap := TsgcHTMLComponent_Heatmap.Create(nil);
try
oHeatmap.RowLabels.CommaText := 'Mon,Tue,Wed,Thu,Fri';
oHeatmap.ColumnLabels.CommaText := '9h,12h,15h,18h';
oHeatmap.ShowLegend := True;
oHeatmap.ShowValues := True;
oHeatmap.SetCell(0, 0, 12);
oHeatmap.SetCell(0, 1, 48);
oHeatmap.SetCell(1, 2, 76);
oHeatmap.SetCell(4, 3, 92);
WebModule.Response := oHeatmap.HTML; // SVG grid, min->max colour scale
finally
oHeatmap.Free;
end;
end;
// Or bind it straight to a dataset:
oHeatmap.LoadFromDataSet(qryTraffic, 'DayName', 'HourSlot', 'Visits');// includes: sgcHTML_Component_Heatmap.hpp
TsgcHTMLComponent_Heatmap *oHeatmap = new TsgcHTMLComponent_Heatmap(NULL);
try
{
oHeatmap->RowLabels->CommaText = "Mon,Tue,Wed,Thu,Fri";
oHeatmap->ColumnLabels->CommaText = "9h,12h,15h,18h";
oHeatmap->ShowLegend = true;
oHeatmap->ShowValues = true;
oHeatmap->SetCell(0, 0, 12);
oHeatmap->SetCell(0, 1, 48);
oHeatmap->SetCell(1, 2, 76);
oHeatmap->SetCell(4, 3, 92);
String html = oHeatmap->HTML; // SVG grid, min->max colour scale
}
__finally
{
delete oHeatmap;
}using esegece.sgcWebSockets;
var heatmap = new TsgcHTMLComponent_Heatmap();
heatmap.RowLabels.CommaText = "Mon,Tue,Wed,Thu,Fri";
heatmap.ColumnLabels.CommaText = "9h,12h,15h,18h";
heatmap.ShowLegend = true;
heatmap.ShowValues = true;
heatmap.SetCell(0, 0, 12);
heatmap.SetCell(0, 1, 48);
heatmap.SetCell(1, 2, 76);
heatmap.SetCell(4, 3, 92);
string html = heatmap.HTML; // SVG grid, min->max colour scaleThe members you reach for most often.
SetCell(aRow, aCol, aValue) writes one value; FindCell looks one up and ClearData empties the Cells collection.
RowLabels and ColumnLabels are TStringLists that name each row and column of the grid.
MinColor/MaxColor/EmptyColor blend per cell; AutoMin/AutoMax pin MinValue/MaxValue instead of scaling from the data.
LoadFromDataSet(aDataSet, aRowField, aColField, aValueField) builds the grid straight from a query.
CellSize/CellGap/Rounded shape the cells; ShowValues/Decimals/FontSize control the printed numbers.
ShowLegend draws a min-to-max gradient bar; ShowRowLabels/ShowColumnLabels toggle the axis text.
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