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几行代码绘制环形图
Delphi、C++ Builder 和 C# 中使用相同的 API：按地区显示收入的环形图，带“其他”扇区，采用深色主题并导出为 PNG。
构建模型、一个中心孔占 55% 的饼图系列、一个 VCL 视图，以及一个写出 1200 x 700 PNG 的渲染器。
uses
Controls, sgcUICore_Theme, sgcCharts_Chart, sgcCharts_Series_Pie,
sgcCharts_Renderer, sgcCharts_VCL;
// Revenue by region as a donut chart with an "Others" slice,
// on a dark theme, exported to PNG.
procedure BuildDonut(aOwner: TWinControl);
var
oChart: TsgcChart;
oView: TsgcVCLChart;
oPie: TsgcChartSeries_Pie;
oPNG: TsgcChartRenderer;
begin
oChart := TsgcChart.Create(aOwner);
oChart.Theme := utDark;
oChart.Title.Text := 'Revenue by region';
oChart.Legend.Position := clpRight;
oPie := TsgcChartSeries_Pie.Create(aOwner);
oPie.Chart := oChart;
oPie.InnerRadiusPercent := 55;
oPie.OthersThreshold := 4;
oPie.OthersText := 'Others';
oPie.ExplodeOnClick := True;
oPie.AddItem('North America', 420);
oPie.AddItem('Europe', 310);
oPie.AddItem('Asia Pacific', 280);
oPie.AddItem('Latin America', 95);
oPie.AddItem('Middle East', 12);
oView := TsgcVCLChart.Create(aOwner);
oView.Parent := aOwner;
oView.Align := alClient;
oView.Chart := oChart;
oPNG := TsgcChartRenderer.Create(aOwner);
oPNG.Chart := oChart;
oPNG.RenderToPNGFile('revenue.png', 1200, 700);
end;
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C++ Builder 中的同一个环形图，使用生成的 sgcCharts_*.hpp 头文件。
#include <vcl.h>
#include "sgcUICore_Theme.hpp"
#include "sgcCharts_Chart.hpp"
#include "sgcCharts_Series_Pie.hpp"
#include "sgcCharts_Renderer.hpp"
#include "sgcCharts_VCL.hpp"
// Revenue by region as a donut chart with an "Others" slice,
// on a dark theme, exported to PNG.
void BuildDonut(TWinControl *aOwner)
{
TsgcChart *oChart = new TsgcChart(aOwner);
oChart->Theme = utDark;
oChart->Title->Text = "Revenue by region";
oChart->Legend->Position = clpRight;
TsgcChartSeries_Pie *oPie = new TsgcChartSeries_Pie(aOwner);
oPie->Chart = oChart;
oPie->InnerRadiusPercent = 55;
oPie->OthersThreshold = 4;
oPie->OthersText = "Others";
oPie->ExplodeOnClick = true;
oPie->AddItem("North America", 420, 0);
oPie->AddItem("Europe", 310, 0);
oPie->AddItem("Asia Pacific", 280, 0);
oPie->AddItem("Latin America", 95, 0);
oPie->AddItem("Middle East", 12, 0);
TsgcVCLChart *oView = new TsgcVCLChart(aOwner);
oView->Parent = aOwner;
oView->Align = alClient;
oView->Chart = oChart;
TsgcChartRenderer *oPNG = new TsgcChartRenderer(aOwner);
oPNG->Chart = oChart;
oPNG->RenderToPNGFile("revenue.png", 1200, 700);
}
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C# 中的无界面渲染：使用 Rendering 包，无需窗口，将同一模型渲染为 PNG。
using esegece.sgcCharts;
using esegece.sgcUICore;
// Revenue by region as a donut chart with an "Others" slice,
// on a dark theme, rendered headless to PNG (no window needed).
public static class RevenueDonut
{
public static void Render()
{
var oChart = new TsgcChart();
oChart.Theme = TsgcUITheme.utDark;
oChart.Title.Text = "Revenue by region";
oChart.Legend.Position = TsgcChartLegendPosition.clpRight;
var oPie = new TsgcChartSeries_Pie();
oPie.Chart = oChart;
oPie.InnerRadiusPercent = 55;
oPie.OthersThreshold = 4;
oPie.OthersText = "Others";
oPie.ExplodeOnClick = true;
oPie.AddItem("North America", 420);
oPie.AddItem("Europe", 310);
oPie.AddItem("Asia Pacific", 280);
oPie.AddItem("Latin America", 95);
oPie.AddItem("Middle East", 12);
var oPNG = new TsgcChartRenderer();
oPNG.Chart = oChart;
oPNG.RenderToPNGFile("revenue.png", 1200, 700);
}
}
dotnet add package esegece.sgcCharts.Rendering
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