C#绘制曲线图
时间(min) 电压(v)
0.0000 -0.0250
0.0017 -0.0270
0.0033 -0.0270
0.0050 -0.0280
0.0067 0.0270
0.0083 0.0250
······
请教在C#中怎样把这些点绘制成曲线图？十分感谢！ 展开
我只能说给你个代码参考下吧 要真说起来蛮复杂的
private void drowPic()//绘制图表的方法
{
Graphics g = this.CreateGraphics(); //创建Graphics对象
g.Clear(Color.WhiteSmoke); //设置背景色
Pen p = new Pen(Color.Blue); //绘制画笔
//设置用到的字体
Font fontO = new System.Drawing.Font("Arial", 9, FontStyle.Regular);
Font fontT = new System.Drawing.Font("华文新魏", 16, FontStyle.Regular);
//绘制边框与显示字体
Point pointStart = new Point(0, 0);
Size sizeWindows = new Size(this.Width - 8, this.Height - 34); //创建Size对象
Rectangle rect = new Rectangle(pointStart, sizeWindows); //创建Rectangle对象
g.DrawRectangle(p, rect); //绘制矩形
Brush brus = new SolidBrush(Color.Red); //创建笔刷
g.DrawString("网站人气指数曲线分析", fontT, brus, this.Width / 2.00f - 150, 10.00f);
//绘制网格线
int x = this.Width / 10;
int y = this.Height / 14;
int z = this.Width / 10;
int k = y * 12;
//X
for (int i = 0; i < 12; i++)
{
g.DrawLine(p, x, y * 3 - 10, x, y * 12); //绘制水平线条
x = x + (this.Width - 34) / 14;
}
//X轴
String[] n = {" 1月", " 2月", " 3月", " 4月", " 5月", " 6月", " 7月",
" 8月", " 9月", "10月", "11月", "12月"}; //绘制月份
x = this.Width / 10 - 16;
for (int i = 0; i < 12; i++)
{
g.DrawString(n[i].ToString(), fontO, Brushes.Red, x, y * 12); //设置文字内容及输出位置
x = x + (this.Width - 34) / 14;
}
//Y
for (int i = 0; i < 12; i++)
{
g.DrawLine(p, z, k, x + 10, k); //绘制垂直线条
k = k - (y * 12) / 16;
}
//Y轴
int h = k;
String[] m = {"5500","5000","4500", "4000", "3500", "3000", "2500", "2000", "1500", "1000",
" 500"}; //绘制Y轴显示的文字
k = y * 12;
for (int i = 0; i < 11; i++)
{
g.DrawString(m[10 - i].ToString(), fontO, Brushes.Red, z - 35, k - y); //开始绘制文字
k = k - (y * 12) / 16;
}
int[] Count = new int[12];
Pen mypen = new Pen(Color.Red, 2); //创建画笔
Point[] points = new Point[12];
x = this.Width / 10;
k = y * 12;
SqlConnection Con = new SqlConnection("Server=WRET-MOSY688YVW\\MRGLL;DataBase=db_TomeOne;Uid=sa;Pwd=");
string cmdtxt2 = "SELECT * FROM tb_reticulation"; //声明SQL语句
SqlCommand Com1 = new SqlCommand(cmdtxt2, Con); //创建SqlCommand对象
SqlDataAdapter da = new SqlDataAdapter(); //创建SqlDataAdapter对象
da.SelectCommand = Com1;
DataSet ds = new DataSet(); //创建DataSet对象
da.Fill(ds); //Fill方法填充DataSet对象
//以上数据库的操作是读取出每个点的数值 看你具体情况而定 可以省略 可直接运行下面的for代码段 把你的数据输入进去
int j = 0;
for (j = 0; j < 12; j++)
{
//与Y轴数生成有关(y * 12)/16因为起始为500
Count[j] = Convert.ToInt32(ds.Tables[0].Rows[0][j + 2].ToString()) * (y * 12) / 16 / 500;
}
//设置绘制曲线的坐标数组
points[0].X = x; points[0].Y = k - Count[0];
x = x + (this.Width - 34) / 14;
points[1].X = x; points[1].Y = k - Count[1];
x = x + (this.Width - 34) / 14;
points[2].X = x; points[2].Y = k - Count[2];
x = x + (this.Width - 34) / 14;
points[3].X = x; points[3].Y = k - Count[3];
x = x + (this.Width - 34) / 14;
points[4].X = x; points[4].Y = k - Count[4];
x = x + (this.Width - 34) / 14;
points[5].X = x; points[5].Y = k - Count[5];
x = x + (this.Width - 34) / 14;
points[6].X = x; points[6].Y = k - Count[6];
x = x + (this.Width - 34) / 14;
points[7].X = x; points[7].Y = k - Count[7];
x = x + (this.Width - 34) / 14;
points[8].X = x; points[8].Y = k - Count[8];
x = x + (this.Width - 34) / 14;
points[9].X = x; points[9].Y = k - Count[9];
x = x + (this.Width - 34) / 14;
points[10].X = x; points[10].Y = k - Count[10];
x = x + (this.Width - 34) / 14;
points[11].X = x; points[11].Y = k - Count[11];
g.DrawLines(mypen, points); //绘制折线
}
最后的结果如下：
