求助,如何根据已有的公式和数据画出曲线图 我需要得到的结果是输入一系列数据,点下BUTTON,然后根据一定的公式计算后跳出相应的曲线图.也许对高手来说这是个很简单的问题.但我现在入门,实在是不知道如何下手.希望高手们能给予解答,或是能给我一些比较详细的实例.小弟在这里先谢谢了. 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 这个其实去看看GDI+就好了本题的数值计算不是很困难 主要是利用GDI+,在System.Drawing命名空间下的类。 GDI+using System.Drawing; GDI+ using System.Drawing; 这个不好说,你的数据要看是什么样的了,柱状,折线,饼的画法网上你可以搜下 http://www.cnblogs.com/skyivben/archive/2005/10/26/262133.html // plot.cs: 画函数图形, 编译方法: csc /t:winexe plot.cs using System; using System.Drawing; using System.Windows.Forms; namespace Skyiv.Ben.Plot { sealed class PlotForm : Form { // 要画的函数,如果能在 TextBox 中输入函数的表达式就更好了 double Function(double x) { double u = Math.PI - x; double pi2 = Math.PI * Math.PI; return 3 * x * x + Math.Log(u * u) / pi2 / pi2 + 1; } // 仅仅用来显示在屏幕上 string FunctionString() { return "f(x) = 3 * x^2 + pi^-4 * ln[(pi-x)^2] + 1"; } const int yBase = 24; // 屏幕保留区域的高度 TextBox tbxX0, tbxX1; // 函数自变量的取值范围 PlotForm() { SuspendLayout(); Button btnSubmit = new Button(); btnSubmit.Text = "刷新"; btnSubmit.Location = new Point(0, 0); btnSubmit.Size = new Size(48, 24); btnSubmit.Click += new EventHandler(BtnSubmit_Click); tbxX0 = new TextBox(); tbxX0.Text = "-10"; tbxX0.Location = new Point(55, 3); tbxX0.Size = new Size(150, 20); tbxX1 = new TextBox(); tbxX1.Text = "10"; tbxX1.Location = new Point(210, 3); tbxX1.Size = new Size(150, 20); Controls.AddRange(new Control[]{btnSubmit, tbxX0, tbxX1}); Text = "Plot"; BackColor = Color.White; ClientSize = new Size(600, 600 + yBase); // WindowState = FormWindowState.Maximized; ResumeLayout(false); } void BtnSubmit_Click(object sender, EventArgs e) { Invalidate(); } protected override void OnSizeChanged(EventArgs e) { Invalidate(); base.OnSizeChanged(e); } protected override void OnPaint(PaintEventArgs e) { double x0 = double.Parse(tbxX0.Text); double x1 = double.Parse(tbxX1.Text); Graphics gc = e.Graphics; Size size = ClientSize; int i0 = 0; int i1 = size.Width - 1; int j0 = yBase; int j1 = size.Height - 1; Pen pen = new Pen(Color.Black, 1); gc.DrawLine(pen, i0, j0, i1, j0); // 画图区和保留区的分界线 double rx = (x1 - x0) / (i1 - i0); double y0, y1; GetFunctionValueRange(x0, rx, i0, i1, out y0, out y1); double ry = (y1 - y0) / (j1 - j0); Out(gc, 0, "ClientSize: {0}x{1}", i1 - i0 + 1, j1 - j0 + 1); Out(gc, 1, FunctionString()); Out(gc, 2, "x:[{0}, {1}] range:{2}", x0, x1, x1 - x0); Out(gc, 3, "y:[{0}, {1}] range:{2}", y0, y1, y1 - y0); Out(gc, 4, "rx:{0}", 1 / rx); // 函数自变量每单位值用多少个象素表示 Out(gc, 5, "ry:{0}", 1 / ry); // 函数的值每单位值用多少个象素表示 Out(gc, 6, "r :{0}", rx / ry); // 该值如果小于1表示图形纵向被压扁,反之则被拉伸 pen.Color = Color.Green; int j = j1 + (int)(y0 / ry); if (j >= j0 && j <= j1) gc.DrawLine(pen, i0, j, i1, j); // x坐标轴 int i = i0 - (int)(x0 / rx); if (i >= i0 && i <= i1) gc.DrawLine(pen, i, j0, i, j1); // y坐标轴 pen.Color = Color.Red; for (i = i0; i <= i1; i++) { double x = x0 + (i - i0) * rx; double y = Function(x); if (double.IsInfinity(y) || double.IsNaN(y)) continue; j = j1 - (int)((y - y0) / ry); if (j > j1 || j < j0) continue; gc.DrawLine(pen, i, j, i + 1, j); // 画函数的图形 } base.OnPaint(e); } // 函数值的取值范围 void GetFunctionValueRange(double x0, double rx, int i0, int i1, out double y0, out double y1) { y0 = double.MaxValue; y1 = double.MinValue; for (int i = i0; i <= i1; i++) { double x = x0 + (i - i0) * rx; double y = Function(x); if (double.IsInfinity(y) || double.IsNaN(y)) continue; if (y0 > y) y0 = y; if (y1 < y) y1 = y; } } // 在指定的位置写字符串 void Out(Graphics gc, int line, string fmt, params object [] args) { gc.DrawString(string.Format(fmt, args), new Font("Courier New", 10), Brushes.Blue, new PointF(5, yBase + 15 * line)); } static void Main() { Application.Run(new PlotForm()); } } } http://www.cnblogs.com/skyivben/archive/2005/11/01/266649.html 请教个反编译的方法的源代码 请教下关于正则表达式\n和\r的区别 请问窗体的“隐藏”和“关闭”有什么区别? 在C#中,怎样快速插入当前日期 C#旋转图形的算法 简单!新手请教 :拆分字符串问题!!!!!!!!!!! 请问高手(c#2.0数据存取问题、动态产生form和动态产生控件如datagridview) 做了一个软件给客户,如何实现sn功能 求一个winform查询语句!!! 在WinForm,自定义类中添加 System.Timers.Timer控件,为什么不能正常进行 请问下C#中的对象清除和资源管理能不能留到以后看!! C# 查询出错
本题的数值计算不是很困难
using System.Drawing;
using System.Drawing;
这个不好说,你的数据要看是什么样的了,柱状,折线,饼的画法网上你可以搜下
// plot.cs: 画函数图形, 编译方法: csc /t:winexe plot.cs
using System;
using System.Drawing;
using System.Windows.Forms;
namespace Skyiv.Ben.Plot
{
sealed class PlotForm : Form
{
// 要画的函数,如果能在 TextBox 中输入函数的表达式就更好了
double Function(double x)
{
double u = Math.PI - x;
double pi2 = Math.PI * Math.PI;
return 3 * x * x + Math.Log(u * u) / pi2 / pi2 + 1;
}
// 仅仅用来显示在屏幕上
string FunctionString()
{
return "f(x) = 3 * x^2 + pi^-4 * ln[(pi-x)^2] + 1";
}
const int yBase = 24; // 屏幕保留区域的高度
TextBox tbxX0, tbxX1; // 函数自变量的取值范围
PlotForm()
{
SuspendLayout();
Button btnSubmit = new Button();
btnSubmit.Text = "刷新";
btnSubmit.Location = new Point(0, 0);
btnSubmit.Size = new Size(48, 24);
btnSubmit.Click += new EventHandler(BtnSubmit_Click);
tbxX0 = new TextBox();
tbxX0.Text = "-10";
tbxX0.Location = new Point(55, 3);
tbxX0.Size = new Size(150, 20);
tbxX1 = new TextBox();
tbxX1.Text = "10";
tbxX1.Location = new Point(210, 3);
tbxX1.Size = new Size(150, 20);
Controls.AddRange(new Control[]{btnSubmit, tbxX0, tbxX1});
Text = "Plot";
BackColor = Color.White;
ClientSize = new Size(600, 600 + yBase);
// WindowState = FormWindowState.Maximized;
ResumeLayout(false);
}
void BtnSubmit_Click(object sender, EventArgs e)
{
Invalidate();
}
protected override void OnSizeChanged(EventArgs e)
{
Invalidate();
base.OnSizeChanged(e);
}
protected override void OnPaint(PaintEventArgs e)
{
double x0 = double.Parse(tbxX0.Text);
double x1 = double.Parse(tbxX1.Text);
Graphics gc = e.Graphics;
Size size = ClientSize;
int i0 = 0;
int i1 = size.Width - 1;
int j0 = yBase;
int j1 = size.Height - 1;
Pen pen = new Pen(Color.Black, 1);
gc.DrawLine(pen, i0, j0, i1, j0); // 画图区和保留区的分界线
double rx = (x1 - x0) / (i1 - i0);
double y0, y1;
GetFunctionValueRange(x0, rx, i0, i1, out y0, out y1);
double ry = (y1 - y0) / (j1 - j0);
Out(gc, 0, "ClientSize: {0}x{1}", i1 - i0 + 1, j1 - j0 + 1);
Out(gc, 1, FunctionString());
Out(gc, 2, "x:[{0}, {1}] range:{2}", x0, x1, x1 - x0);
Out(gc, 3, "y:[{0}, {1}] range:{2}", y0, y1, y1 - y0);
Out(gc, 4, "rx:{0}", 1 / rx); // 函数自变量每单位值用多少个象素表示
Out(gc, 5, "ry:{0}", 1 / ry); // 函数的值每单位值用多少个象素表示
Out(gc, 6, "r :{0}", rx / ry); // 该值如果小于1表示图形纵向被压扁,反之则被拉伸
pen.Color = Color.Green;
int j = j1 + (int)(y0 / ry);
if (j >= j0 && j <= j1) gc.DrawLine(pen, i0, j, i1, j); // x坐标轴
int i = i0 - (int)(x0 / rx);
if (i >= i0 && i <= i1) gc.DrawLine(pen, i, j0, i, j1); // y坐标轴
pen.Color = Color.Red;
for (i = i0; i <= i1; i++)
{
double x = x0 + (i - i0) * rx;
double y = Function(x);
if (double.IsInfinity(y) || double.IsNaN(y)) continue;
j = j1 - (int)((y - y0) / ry);
if (j > j1 || j < j0) continue;
gc.DrawLine(pen, i, j, i + 1, j); // 画函数的图形
}
base.OnPaint(e);
}
// 函数值的取值范围
void GetFunctionValueRange(double x0, double rx, int i0, int i1, out double y0, out double y1)
{
y0 = double.MaxValue;
y1 = double.MinValue;
for (int i = i0; i <= i1; i++)
{
double x = x0 + (i - i0) * rx;
double y = Function(x);
if (double.IsInfinity(y) || double.IsNaN(y)) continue;
if (y0 > y) y0 = y;
if (y1 < y) y1 = y;
}
}
// 在指定的位置写字符串
void Out(Graphics gc, int line, string fmt, params object [] args)
{
gc.DrawString(string.Format(fmt, args), new Font("Courier New", 10), Brushes.Blue, new PointF(5, yBase + 15 * line));
}
static void Main()
{
Application.Run(new PlotForm());
}
}
}