using?System;
using?System.Drawing;
using?System.Collections;
using?System.ComponentModel;
using?System.Windows.Forms;
using?System.Drawing.Imaging?;
using?System.Drawing.Drawing2D?;
using?System.IO;

namespace?WindowsApplication1
{
????public?partial?class?Form1?:?Form
????{
????????public?double[]?splinex?=?new?double[1001];
????????public?double[]?spliney?=?new?double[1001];
????????public?point[]?pt?=?new?point[6];
????????public?int?no_of_points?=?0;
????????int[]?a1?=?new?int[12];
????????int[]?b1?=?new?int[12];
???????
?????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????????
????????}
????????public?struct?point
????????{
????????????public?int?x;
????????????public?int?y;

????????????public?void?setxy（int?i?int?j）
????????????{
????????????????x?=?i;
????????????????y?=?j;
????????????}
????????}??

????????//?Prints?a?dot?at?the?place?whrere?the?mouseup?event?occurs?
????????private?void?pictureBox1_MouseUp（object?sender?MouseEventArgs?e）
????????{
????????????Graphics?g?=?pictureBox1.CreateGraphics（）;
????????????Color?cl=Color.Black;
????????????g.DrawLine?（new?Pen（cl?2）?e.X?e.Y?e.X+1???e.Y+1??）;

????????}

????????//?At?each?mousedown?event?the?the?no?of?points?is?calculated?if?the?value?is?more?than?3
????????//then?the?curve?is?drawn
????????private?void?pictureBox1_MouseDown（object?sender?MouseEventArgs?e）
????????{
????????????	if?（no_of_points?>?3）
				{					
					pt[0]?=?pt[1];pt[1]?=?pt[2];pt[2]?=?pt[3];
????????????????????pt[3].setxy（e.X?e.Y）;
????????????????????double?temp?=?Math.Sqrt（Math.Pow（pt[2].x?-?pt[1].x?2F）?+?Math.Pow（pt[2].y?-?pt[1].y?2F））;
					int?interpol?=?System.Convert.ToInt32（temp）;
					bsp（pt[0]pt[1]pt[2]pt[3]interpol）;
					int?i;?
????????????????????int?width=2;
????????????????????Graphics?g?=?pictureBox1.CreateGraphics（）;
????????????????????Color?cl=Color.Blue;
????????????????????int?xy;
????????????????????//?the?lines?are?drawn
					for?（i?=?0;?i?<=?interpol?-?1;?i++）
					{
					?x=System.Convert.ToInt32（splinex[i]）;
?????????????????????y=System.Convert.ToInt32（spliney[i]）;????????????????????
?????????????????????g.DrawLine（??new?Pen（cl?width）??x?-?1?y?x?+?1?y）;
??????????????????????g.DrawLine（new?Pen（cl?width）?x?y?-?1?x?y?+?1）;
???????????????????????????????
????????????????????}				
				}
				else
				{
					pt[no_of_points].setxy（e.X?e.Y）;
				}				
				no_of_points?=?no_of_points?+?1;			?
			?
????????}
?????????
????????//?calculating?the?values?using?the?algorithm?
????????public?void?bsp（point?p1?point?p2?point?p3?point?p4?int?divisions）
????????{
????????????double[]?a?=?new?double[5];
????????????double[]?b?=?new?double[5];
????????????a[0]?=?（-p1.x?+?3?*?p2.x?-?3?*?p3.x?+?p4.x）?/?6.0;
????????????a[1]?=?（3?*?p1.x?-?6?*?p2.x?+?3?*?p3.x）?/?6.0;
????????????a[2]?=?（-3?*?p1.x?+?3?*?p3.x）?/?6.0;
????????????a[3]?=?（p1.x?+?4?*?p2.x?+?p3.x）?/?6.0

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????946??2006-12-07?19:45??WindowsApplication1\WindowsApplication1.sln
?????文件????????8704??2006-12-07?19:45??WindowsApplication1\WindowsApplication1.suo
?????目錄???????????0??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\
?????目錄???????????0??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\bin\
?????目錄???????????0??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\bin\Debug\
?????文件???????20480??2006-12-08?00:40??WindowsApplication1\WindowsApplication1\bin\Debug\WindowsApplication1.exe
?????文件????????5632??2005-09-23?06:56??WindowsApplication1\WindowsApplication1\bin\Debug\WindowsApplication1.vshost.exe
?????文件????????3678??2006-12-08?00:40??WindowsApplication1\WindowsApplication1\Form1.cs
?????文件????????2536??2006-12-08?00:40??WindowsApplication1\WindowsApplication1\Form1.Designer.cs
?????文件????????5814??2006-12-08?00:40??WindowsApplication1\WindowsApplication1\Form1.resx
?????文件?????????486??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Program.cs
?????目錄???????????0??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\
?????文件????????1294??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\AssemblyInfo.cs
?????文件????????2865??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\Resources.Designer.cs
?????文件????????5612??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\Resources.resx
?????文件????????1102??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\Settings.Designer.cs
?????文件?????????249??2006-12-07?19:44??WindowsApplication1\WindowsApplication1\Properties\Settings.settings
?????文件????????3245??2006-12-07?19:50??WindowsApplication1\WindowsApplication1\WindowsApplication1.csproj