快速生成折线图时，只需要修改代码中的以下数据：
1、Y轴刻度个数：Ycounts
2、Y轴最小刻度数：YminValue
3、横坐标：数组mouth
4、标题：strTopic
5、用户数据：数组d
6、[可选]修改背景色：代码中27行改为所需要的颜色即可
完整代码：
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Text; 7 using System.Windows.Forms; 8 9 namespace Test11 10 { 11 public partial class Form1 : Form 12 { 13 public Form1() 14 { 15 InitializeComponent(); 16 } 17 18 private void Form1_Paint(object sender, PaintEventArgs e) 19 { 20 int Ycounts = 9;//Y轴刻度个数 21 int YminValue = 20;//Y轴最小值 22 string[] month = new string[8] { "1至3天", "4至7天", "8至14天", "15至21天", "22至28天", "29至39天", "36至42天", "42天以后" }; 23 float[] d = new float[8] { 36, 35, 33.5F, 31.5F, 29, 27, 26, 21 }; 24 //画图初始化 25 Bitmap bMap = new Bitmap(500, 500); 26 Graphics gph = Graphics.FromImage(bMap); 27 gph.Clear(Color.White); 28 PointF cPt = new PointF(40, 420);//中心点 29 PointF[] xPt = new PointF[3] { new PointF(cPt.Y + 15, cPt.Y), new PointF(cPt.Y, cPt.Y - 8), new PointF(cPt.Y, cPt.Y + 8) };//X轴三角形 30 PointF[] yPt = new PointF[3] { new PointF(cPt.X, cPt.X - 15), new PointF(cPt.X - 8, cPt.X), new PointF(cPt.X + 8, cPt.X) };//Y轴三角形 31 string strTopic = "畜禽温度时刻图表"; 32 gph.DrawString(strTopic, new Font("宋体", 14), Brushes.Black, new PointF((cPt.Y-strTopic.Length*14)/2, cPt.X*2f/3));//图表标题,居中对齐 33 //画X轴 34 gph.DrawLine(Pens.Black, cPt.X, cPt.Y, cPt.Y, cPt.Y); 35 gph.DrawPolygon(Pens.Black, xPt); 36 gph.FillPolygon(new SolidBrush(Color.Black), xPt); 37 gph.DrawString("天数", new Font("宋体", 12), Brushes.Black, new PointF(cPt.Y + 12, cPt.Y + 12));//12为字体大小 38 //画Y轴 39 gph.DrawLine(Pens.Black, cPt.X, cPt.Y, cPt.X, cPt.X); 40 gph.DrawPolygon(Pens.Black, yPt); 41 gph.FillPolygon(new SolidBrush(Color.Black), yPt); 42 gph.DrawString("单位(摄氏度)", new Font("宋体", 12), Brushes.Black, new PointF(0, 6));//6为字体大小的一半 43 44 for (int i = 0; i < Ycounts; i++) 45 { 46 //画Y轴刻度 47 string strY = (i * 2 + YminValue).ToString();//Y轴刻度值 48 gph.DrawString(strY, new Font("宋体", 11), Brushes.Black, new PointF(cPt.X - strY.Length*11, cPt.Y - i * (cPt.Y-cPt.X)/Ycounts-11*2f/3));//11为字体大小 49 if (i != 0) 50 { 51 gph.DrawLine(Pens.Black, cPt.X + 3, cPt.Y - i * (cPt.Y - cPt.X) / Ycounts , cPt.X, cPt.Y - i * (cPt.Y - cPt.X) / Ycounts); 52 } 53 } 54 55 for (int i = 1; i <= month.Length; i++) 56 { 57 //画X轴项目 58 int positionWordTian=month[i-1].IndexOf("天"); 59 int positionWordZhi = month[i - 1].IndexOf("至"); 60 int py = 0; 61 if (positionWordZhi > 0) 62 { 63 gph.DrawString(month[i - 1].Substring(0, positionWordZhi).PadLeft(2), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + (i - 1) * (cPt.Y-cPt.X)/month.Length-11, cPt.Y)); 64 gph.DrawString(month[i - 1].Substring(positionWordZhi, 1), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length-11, cPt.Y + 15));//15为字体比例大小，下同 65 gph.DrawString(month[i - 1].Substring(positionWordZhi + 1, positionWordTian - positionWordZhi - 1).PadLeft(2), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length-11, cPt.Y + 30)); 66 py = 30; 67 } 68 else 69 { 70 gph.DrawString(month[i - 1].Substring(0, positionWordTian), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length-11, cPt.Y)); 71 } 72 for (int j = positionWordTian; j < month[i - 1].Length;j++ ) 73 gph.DrawString(month[i - 1].Substring(j, 1), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length-11, cPt.Y + (j - positionWordTian + 1) * 15 + py)); 74 //画X轴刻度 75 if (i != 0) 76 { 77 gph.DrawLine(Pens.Black, cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length, cPt.Y-3, cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length, cPt.Y); 78 } 79 //画点 80 float YpointPosition = (cPt.Y - cPt.X) / (Ycounts * 2f); 81 gph.DrawEllipse(Pens.Black, cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length, cPt.Y - (d[i - 1] - YminValue) * YpointPosition - 1.5F, 3, 3); 82 gph.FillEllipse(new SolidBrush(Color.Black), cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length, cPt.Y - (d[i - 1] - YminValue) * YpointPosition - 1.5F, 3, 3); 83 //画折线 84 if (i > 1) gph.DrawLine(Pens.Red, cPt.X + (i - 2) * (cPt.Y - cPt.X) / month.Length, cPt.Y - (d[i - 2] - YminValue) * YpointPosition - 1.5F, cPt.X + (i - 1) * (cPt.Y - cPt.X) / month.Length, cPt.Y - (d[i - 1] - YminValue) * YpointPosition - 1.5F); 85 } 86 pictureBox1.Image = bMap; 87 } 88 } 89 }
效果图如下：
