Nevron Vision for .NET是Nevron公司推出的套包产品，其中包含了图表、仪表、流程图、地图控件，这篇文章主要介绍其中的Nevron Diagram for .NET流程图控件，如何快速在WinForm应用中绘制流程图，具体查看下面的完整代码：
using Nevron.GraphicsCore;
using Nevron.Diagram;
using Nevron.Diagram.Shapes;
using Nevron.Diagram.WinForm;
private void Form1_Load(object sender, System.EventArgs e)
{
// begin view init
nDrawingView1.BeginInit();
// display the document in the view
nDrawingView1.Document = nDrawingDocument1;
// do not show ports
nDrawingView1.GlobalVisibility.ShowPorts = false;
// hide the grid
nDrawingView1.Grid.Visible = false;
// fit the document in the viewport
nDrawingView1.ViewLayout = ViewLayout.Fit;
// apply padding to the document bounds
nDrawingView1.DocumentPadding = new Nevron.Diagram.NMargins(10);
// init document
nDrawingDocument1.BeginInit();
// create the flowcharting shapes factory
NFlowChartingShapesFactory factory = new NFlowChartingShapesFactory(nDrawingDocument1);
// modify the connectors style sheet
NStyleSheet styleSheet = (nDrawingDocument1.StyleSheets.GetChildByName(NDR.NameConnectorsStyleSheet, -1) as NStyleSheet);
NTextStyle textStyle = new NTextStyle();
textStyle.BackplaneStyle.Visible = true;
textStyle.BackplaneStyle.StandardFrameStyle.InnerBorderWidth = new NLength(0);
styleSheet.Style.TextStyle = textStyle;
styleSheet.Style.StrokeStyle = new NStrokeStyle(1, Color.Black);
styleSheet.Style.StartArrowheadStyle.StrokeStyle = new NStrokeStyle(1, Color.Black);
styleSheet.Style.EndArrowheadStyle.StrokeStyle = new NStrokeStyle(1, Color.Black);
// create the begin shape
NShape begin = factory.CreateShape(FlowChartingShapes.Termination);
begin.Bounds = new NRectangleF(100, 100, 100, 100);
begin.Text = "BEGIN";
nDrawingDocument1.ActiveLayer.AddChild(begin);
// create the step1 shape
NShape step1 = factory.CreateShape(FlowChartingShapes.Process);
step1.Bounds = new NRectangleF(100, 400, 100, 100);
step1.Text = "STEP1";
nDrawingDocument1.ActiveLayer.AddChild(step1);
// connect begin and step1 with bezier link
NBezierCurveShape bezier = new NBezierCurveShape();
bezier.StyleSheetName = NDR.NameConnectorsStyleSheet;
bezier.Text = "BEZIER";
bezier.FirstControlPoint = new NPointF(100, 300);
bezier.SecondControlPoint = new NPointF(200, 300);
nDrawingDocument1.ActiveLayer.AddChild(bezier);
bezier.FromShape = begin;
bezier.ToShape = step1;
// create question1 shape
NShape question1 = factory.CreateShape(FlowChartingShapes.Decision);
question1.Bounds = new NRectangleF(300, 400, 100, 100);
question1.Text = "QUESTION1";
nDrawingDocument1.ActiveLayer.AddChild(question1);
// connect step1 and question1 with line link
NLineShape line = new NLineShape();
line.StyleSheetName = NDR.NameConnectorsStyleSheet;
line.Text = "LINE";
nDrawingDocument1.ActiveLayer.AddChild(line);
line.FromShape = step1;
line.ToShape = question1;
// create the step2 shape
NShape step2 = factory.CreateShape(FlowChartingShapes.Process);
step2.Bounds = new NRectangleF(500, 100, 100, 100);
step2.Text = "STEP2";
nDrawingDocument1.ActiveLayer.AddChild(step2);
// connect step2 and question1 with HV link
NStep2Connector hv1 = new NStep2Connector(false);
hv1.StyleSheetName = NDR.NameConnectorsStyleSheet;
hv1.Text = "HV1";
nDrawingDocument1.ActiveLayer.AddChild(hv1);
hv1.FromShape = step2;
hv1.ToShape = question1;
// connect question1 and step2 and with HV link
NStep2Connector hv2 = new NStep2Connector(false);
hv2.StyleSheetName = NDR.NameConnectorsStyleSheet;
hv2.Text = "HV2";
nDrawingDocument1.ActiveLayer.AddChild(hv2);
hv2.FromShape = question1;
hv2.ToShape = step2;
// create a self loof as bezier on step2
NBezierCurveShape selfLoop = new NBezierCurveShape();
selfLoop.StyleSheetName = NDR.NameConnectorsStyleSheet;
selfLoop.Text = "SELF LOOP";
nDrawingDocument1.ActiveLayer.AddChild(selfLoop);
selfLoop.FromShape = step2;
selfLoop.ToShape = step2;
selfLoop.Reflex();
// create step3 shape
NShape step3 = factory.CreateShape(FlowChartingShapes.Process);
step3.Bounds = new NRectangleF(700, 600, 100, 100);
step3.Text = "STEP3";
nDrawingDocument1.ActiveLayer.AddChild(step3);
// connect question1 and step3 with an HVH link
NStep3Connector hvh1 = new NStep3Connector(false, 50, 0, true);
hvh1.StyleSheetName = NDR.NameConnectorsStyleSheet;
hvh1.Text = "HVH1";
nDrawingDocument1.ActiveLayer.AddChild(hvh1);
hvh1.FromShape = question1;
hvh1.ToShape = step3;
// create end shape
NShape end = factory.CreateShape(FlowChartingShapes.Termination);
end.Bounds = new NRectangleF(300, 700, 100, 100);
end.Text = "END";
nDrawingDocument1.ActiveLayer.AddChild(end);
// connect step3 and end with VH link
NStep2Connector vh1 = new NStep2Connector(true);
vh1.StyleSheetName = NDR.NameConnectorsStyleSheet;
vh1.Text = "VH1";
nDrawingDocument1.ActiveLayer.AddChild(vh1);
vh1.FromShape = step3;
vh1.ToShape = end;
// connect question1 and end with curve link (uses explicit ports)
NRoutableConnector curve = new NRoutableConnector(RoutableConnectorType.DynamicCurve);
curve.StyleSheetName = NDR.NameConnectorsStyleSheet;
curve.Text = "CURVE";
nDrawingDocument1.ActiveLayer.AddChild(curve);
curve.StartPlug.Connect(question1.Ports.GetChildAt(3) as NPort);
curve.EndPlug.Connect(end.Ports.GetChildAt(1) as NPort);
curve.InsertPoint(1, new NPointF(500, 600));
// set a shadow to the nDrawingDocument1. Since styles are inheritable all objects will reuse this shadow
nDrawingDocument1.Style.ShadowStyle = new NShadowStyle(
ShadowType.GaussianBlur,
Color.Gray,
new NPointL(5, 5),
1,
new NLength(3));
// shadows must be displayed behind document content
nDrawingDocument1.ShadowsZOrder = ShadowsZOrder.BehindDocument;
// end nDrawingDocument1 init
nDrawingDocument1.EndInit();
//end view init
nDrawingView1.EndInit();
}
运行效果图如下：
