The Graph object defines an area where you can draw Shapes . The following figure shows the coordinates in the Graph area. The lower-left point of the Graph area is the origin of the coordinates system. All Shapes in the Graph are oriented using coordinates in this system.
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A Graph Paragraph has a collection of Shapes encapsulated in itself. We can add any kind of Shape supported by Aspose.Pdf to that Shapes collection. In the example below, we have demonstrated the addition of a Curve in the Shapes collection of a Graph object.
Curve is a special kind of Shape that requires 4 control points (as its coordinates) to be drawn. Each control point has its own X-axis and Y-axis values. So, we have to pass 8 float constants as 4 control points. Then a Curve Shape is added to the PDF document. Similarly, other Shapes can also be added to PDF documents.
Example:
[C#]
//Instantiate a Pdf document object
Pdf pdf1 = new Pdf();
//Add a section to the Pdf document
Section sec1 = pdf1.Sections.Add();
//Create a graph object in the section with Width=100 and Height=400
Graph graph1 = new Graph(sec1,100,400);
//Add the graph object to the paragraphs collection of the section
sec1.Paragraphs.Add(graph1);
//Create an array containing the (X,Y) values of 4 control points
//required to position a curve
float[] posArr = new float[]{0,0,200,80,300,40,350,90};
//Create a curve in the graph with the coordinates given as an array to
//the constructor of curve class
Curve curve1 = new Curve(graph1,posArr);
//Add the curve shape into the shapes collection of the graph
graph1.Shapes.Add(curve1);
//Save the Pdf
pdf1.Save(...);
[VB.NET]
'Instantiate a Pdf document object
Dim pdf1 As Pdf = New Pdf()
'Add a section to the Pdf document
Dim sec1 As Section = pdf1.Sections.Add()
'Create a graph object in the section with Width=100 and Height=400
Dim graph1 As Graph = New Graph(sec1, 100, 400)
'Add the graph object to the paragraphs collection of the section
sec1.Paragraphs.Add(graph1)
'Create an array containing the (X,Y) values of 4 control points
'required to position a curve
Dim posArr() As Single = New Single() {0, 0, 200, 80, 300, 40, 350, 90}
'Create a curve in the graph with the coordinates given as an array to
'the constructor of curve class
Dim curve1 As Curve = New Curve(graph1, posArr)
'Add the curve shape into the shapes collection of the graph
graph1.Shapes.Add(curve1)
'Save the Pdf
pdf1.Save(...)
[XML]
<?xml version="1.0" encoding="utf-8" ?>
<Pdf xmlns="Aspose.Pdf">
<Section>
<Graph Height="100" Width="400">
<Curve Position="0 0 200 80 300 40 350 90" />
</Graph>
</Section>
</Pdf>