Asp. NET generates statistical graphics for business data

Asp.net| Data | statistics | Graphics in the use of Excel processing reports, often to use the system with the chart tool to generate a scale diagram, not only intuitive, but also professional. Of course, the Office Web Components feature can also be used in WEB applications, but it is complex. Under the. NET Framework, simple programming makes it easy to make authentic scale diagrams. In the use of GDI + graphics, in addition to skilled application. NET provides, but also from the overall grasp of the graphics generated coordinates. In GDI +, the upper-left corner of the coordinates (0,0), the bottom right corner to do the maximum value.

In this section we will draw the graph by gid+. For example simulation, we use array data to simulate company business data.

Create a new Web form, named Gdi_sample2.aspx, with the following logical code:

'-----Code begin-----

Imports System.Drawing

Imports System.Drawing.Bitmap

Imports System.Drawing.Graphics

Imports System.Drawing.Imaging

Public Class Gdi_sample4

Inherits System.Web.UI.Page

#Region the code generated by the Web Forms Designer

' Omit the code generated by the form designer here

#End Region

' defines a public array variable that is used to store data from the simulated company sales

Public data (5, 1) as String

Private Sub Page_Load (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles MyBase.Load

' The user code to place the initialization page here

Dim I as Int16

Dim Objbitmap as Bitmap

Objbitmap = New Bitmap (400, 300)

' Declare Graphics object

Dim Objgraphics as Graphics

' Specify the canvas

Objgraphics = Graphics.fromimage (Objbitmap)

' Set background color to white

Objgraphics.clear (Color.White)

' Draw a graphic border, pay attention to the space of the underline, for a pixel

Objgraphics.drawrectangle (Pens.black, 1, 1, 398, 298)

' Generate table Header text

Objgraphics.drawstring ("The first half of the company's turnover figures", New Font ("XXFarEastFont-Arial", FontStyle.Bold), Brushes.black, New PointF (60, 5))

' Get Analog data

GetData ()

Dim Monthcolor as PointF = New PointF (260, 40)

Dim fontinfor as PointF = New PointF (285, 36)

' Draw a schematic color legend

For i = 0 to 5

' Draw the fill rectangle.

Objgraphics.fillrectangle (New SolidBrush (GetColor (i)), Monthcolor. X, Monthcolor. Y, 20, 10)

' Draw a rectangular border.

Objgraphics.drawrectangle (Pens.black, Monthcolor. X, Monthcolor. Y, 20, 10)

' Draw the Legend Description text--data (i, 0)

Objgraphics.drawstring (data (i, 0), New Font ("XXFarEastFont-Arial,", Brushes.black, Fontinfor)

' Move the coordinate position and move only the Y-direction value.

Monthcolor. Y + 15

Fontinfor. Y + 15

Next I

' Iterate over each data source and draw a rectangular chart (that is, a column of columns) based on the size of the data.

For i = 0 to 5

' Draw the fill rectangle.

Objgraphics.fillrectangle (New SolidBrush (GetColor (i)), (I *) +, 270-cint (data (I, 1)), CInt (Data (I, 1))

' Draw a rectangular border line.

Objgraphics.drawrectangle (Pens.black, (i *) +, 270-cint (data (I, 1)), CInt (Data (I, 1))

Next

' Draw the schematic coordinates

Objgraphics.drawline (New Pen (Color.Blue, 1), 10, 0, 10, 320)

Objgraphics.drawline (New Pen (Color.Blue, 1), 10, 270, 200, 270)

' Add a numeric marker to the schematic coordinates and pay attention to the calculation of the coordinates.

For i = 0 to 5

Objgraphics.drawline (New Pen (Color.Blue, 1), I * +, I * 50 + 20)

Objgraphics.drawstring ((250-i * 50). ToString, New Font ("XXFarEastFont-Arial", Brushes.black, I * 50 + 8)

Next

' Statistic total sales

Dim Scount as Integer

For i = 0 to 5

Scount + + CInt (data (I, 1))

Next

' Define a pie angle variable

Dim SCG as Single = 0

Dim STG as Single = 0

For i = 0 to 5

' Calculate current angle value: Monthly Sales/Total sales * 360, get the angle size of the month in the pie chart.

SCG = CInt (Data (I, 1))/Scount * 360

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