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.
Drawing in ASP.NET 2.0 and VB.NET
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.
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) |
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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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