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This tutorial will show you how to draw pie and font in ASP.NET and VB.NET 2.0 by using the classes of Graphics.
Download the Full Working Version of this Project written with Visual Studio.NET VB 2005 Here!
Looking for the C#.NET 2005 Version? Click Here!
Looking for more ASP.NET Tutorials? Click Here!
The class of Graphics provide the method of drawing to display device. For instance, the Rectangle, point and others GDI+ basic components that can be assembled. The class of Pen is used for drawing line and curve, while the classes derived from the abstract class Brush can be used for fill the shape. The class of FontFamily have the similar design, but have a little bit of differences on modality.
First, you will need to import the System.Drawing, System.Drawing.Imaging, System.Drawing.Text namespace.
The namespace of system.Drawing provides the access to basic GDI+ graphic function. In the namespace of System.Drawing.Drawing2D, System.Drawing.Imaging and System.Drawing.Text , .Net provides more advanced functionalities.
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
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Create canvas and fill the background
Dim objBitmap As New System.Drawing.Bitmap(400, 440)
Dim objGraphics As System.Drawing.Graphics
objGraphics = System.Drawing.Graphics.FromImage(objBitmap)
objGraphics.Clear(Drawing.Color.White) |
Draw the pie and fill
Dim p As New Drawing.Pen(Drawing.Color.Yellow, 0)
Dim rect As New Drawing.Rectangle(10, 10, 280, 280)
objGraphics.DrawEllipse(p, rect)
Dim b1 As New Drawing.SolidBrush(Drawing.Color.Red)
Dim b2 As New Drawing.SolidBrush(Drawing.Color.Green)
Dim b3 As New Drawing.SolidBrush(Drawing.Color.Blue)
objGraphics.FillPie(b1, rect, 0.0F, 90.0F)
objGraphics.FillPie(b2, rect, 90.0F, 60.0F)
objGraphics.FillPie(b3, rect, 150.0F, 210.0F) |
Draw font
Dim fontfml As New Drawing.FontFamily(Drawing.Text.GenericFontFamilies.Serif)
Dim font As New Drawing.Font(fontfml, 14)
Dim brush As New Drawing.SolidBrush(Drawing.Color.Blue)
objGraphics.DrawString("Draw Graphics", font, brush, 100, 300) |
Export and save to picture
objBitmap.Save(Response.OutputStream, Drawing.Imaging.ImageFormat.Gif)
objBitmap.Save(Server.MapPath("x.jpg"), Drawing.Imaging.ImageFormat.Jpeg)
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End drawing
objBitmap.Dispose()
objGraphics.Dispose()
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Download the Full Working Version of this Project written with Visual Studio.NET VB 2005 Here!
Looking for the C#.NET 2005 Version? Click Here!
Looking for more ASP.NET Tutorials? Click Here!
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