1 //描繪曲線
//創建曲線中的點
Point point1 = new Point(68, 420);
Point point2 = new Point(71, 410);
Point point3 = new Point(74, 423);
Point point4 = new Point(77, 412);
Point point5 = new Point(80, 400);
Point point6 = new Point(90, 380);
Point point7 = new Point(100, 350);
Point point8 = new Point(120, 320);
Point[] curvePoints = { point1, point2, point3, point4, point5, point6, point7, point8 };
GraphicsPath myPath = new GraphicsPath();
//AddCurve(點陣,起點,終點,彎曲程度)
myPath.AddCurve(curvePoints, 0, 7, 0.8f);
Pen myPen = new Pen(Color.Red, 1);
IMG.DrawPath(myPen, myPath);
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2 c#.net畫曲線圖(座標)
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
//數據/月份
public ArrayList arrData=new ArrayList();
public ArrayList arrMonth=new ArrayList();
//定義幕布高寬
private int iCanvasWidth=400;
private int iCanvasHeight=300;
//x軸的間距
private int iX=30;
//y軸間距
private int iY=15;
public void InitArray()
{
for(int i=0;i<6;i++)
arrMonth.Add(i+1);
arrData.Add(200);
arrData.Add(180);
arrData.Add(285);
arrData.Add(290);
arrData.Add(275);
arrData.Add(350);
}
// //pen 畫線
// Pen myPen = new Pen(Color.Black);
// Graphics g = this.CreateGraphics();
// g.DrawEllipse(myPen, 20, 30, 10, 50);
//
// Graphics g1 = this.CreateGraphics();
// SolidBrush myBrush = new SolidBrush(Color.Red);
// g1.FillEllipse(myBrush,20,30,40,40);
// g1.FillRectangle(myBrush,70,70,10,30);
this.InitArray();
Bitmap bitmap= new Bitmap(iCanvasWidth, iCanvasHeight,PixelFormat.Format24bppRgb);
//Graphics g=Graphics.FromImage(bitmap);
Graphics g=this.CreateGraphics();
g.Clear(Color.White);
Font font = new Font("MS UI Gothic",12);
SolidBrush brush = new SolidBrush(Color.Black);
Pen pen = new Pen(Color.Black);
pen.EndCap = LineCap.ArrowAnchor;
pen.DashStyle = DashStyle.Solid;
//座標軸
g.DrawLine(pen,20,220,420,220);
g.DrawLine(pen,20,220,20,20);
//x軸標格
g.DrawLine(Pens.Black,20+iX*1,220,20+iX*1,220-2);
g.DrawLine(Pens.Black,20+iX*2,220,20+iX*2,220-2);
g.DrawLine(Pens.Black,20+iX*3,220,20+iX*3,220-2);
g.DrawLine(Pens.Black,20+iX*4,220,20+iX*4,220-2);
g.DrawLine(Pens.Black,20+iX*5,220,20+iX*5,220-2);
g.DrawLine(Pens.Black,20+iX*6,220,20+iX*6,220-2);
//y軸標格
g.DrawLine(Pens.Black, 20, 220 - iY*1, 20 + 2, 220 - iY*1);
g.DrawLine(Pens.Black, 20, 220 - iY*2, 20 + 2, 220 - iY*2);
g.DrawLine(Pens.Black, 20, 220 - iY*3, 20 + 2, 220 - iY*3);
g.DrawLine(Pens.Black, 20, 220 - iY*4, 20 + 2, 220 - iY*4);
g.DrawLine(Pens.Black, 20, 220 - iY*5, 20 + 2, 220 - iY*5);
g.DrawLine(Pens.Black, 20, 220 - iY*6, 20 + 2, 220 - iY*6);
//
double dblX1=20;
double dblY1=220;
for(int i=0;i<arrData.Count;i++)
{
double dblData=Convert.ToDouble(arrData[i]);
double dblY2=220-dblData*15/200;
double dblX2=20+iX*Convert.ToInt32(arrMonth[i]);
if(i!=0)
{
if(i<arrData.Count-1)
{
g.DrawLine(Pens.Black,float.Parse(dblX1.ToString()),float.Parse(dblY1.ToString()),float.Parse(dblX2.ToString()),float.Parse(dblY2.ToString()));
}
else
{
g.DrawLine(pen,float.Parse(dblX1.ToString()),float.Parse(dblY1.ToString()),float.Parse(dblX2.ToString()),float.Parse(dblY2.ToString()));
}
}
dblX1=dblX2;
dblY1=dblY2;
}
}
}
}
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在．net中，微軟給我們提供了畫圖類（system.drawing.imaging），在該類中畫圖的基本功能都有。比如：直線、折線、矩形、多邊形、橢圓形、扇形、曲線等等，因此一般的圖形都可以直接通過代碼畫出來。接下來介紹一些畫圖函數：
Bitmap bmap=new Bitmap(500,500) /定義圖像大小；
bmap.Save(stream,imagecodecinfo) /將圖像保存到指定的輸出流；
Graphics gph /定義或創建gdi繪圖對像；
PointF cpt /定義二維平面中x,y座標；
DrawString(string,font,brush,ponitf) /用指定的brush和font對像在指定的矩形或點繪製指定的字符串；
DrawLine(pen,ponit,ponit) /用指定的筆(pen)對像繪製指定兩點之間直線；
DrawPolygon(pen,ponit[]) /用指定的筆(pen)對像繪製指定多邊形，比如三角形，四邊形等等；
FillPolygon(brush,ponit[]) /用指定的刷子(brush)對像填充指定的多邊形；
DrawEllipse(pen,x,y,width,height) /用指定的筆繪製一個邊框定義的橢圓；
FillEllipse(brush,x,y,width,height) /用指定的刷子填充一個邊框定義的橢圓；
DrawRectangle(pen,x,y,width,height) /用指定的筆繪製一個指定座標點、寬度、高度的矩形；
DrawPie(pen,x,y,width,height,startangle,sweepangle) /用指定的筆繪製一個指定座標點、寬度、高度以及兩條射線組成的扇形；
下面的例子可以畫出一個折線圖，代碼如下：
private void Form1_Load(object sender, EventArgs e)
{
string[] month=new string[12]{"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};
float[] d=new float[12]{20.5f,60,10.8f,15.6f,30,70.9f,50.3f,30.7f,70,50.4f,30.8f,20};
//畫圖初始化
Bitmap bmap=new Bitmap(500,500);
Graphics gph=Graphics.FromImage(bmap);
gph.Clear(Color.White);
PointF cpt=new PointF(40,420);//中心點
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軸三角形
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軸三角形
gph.DrawString("某工廠某產品月生產量圖表", new Font("宋體", 14), Brushes.Black, new PointF(cpt.X+60, cpt.X));//圖表標題
//畫x軸
gph.DrawLine(Pens.Black, cpt.X,cpt.Y ,cpt.Y,cpt.Y);
gph.DrawPolygon(Pens.Black,xpt);
gph.FillPolygon(new SolidBrush(Color.Black),xpt);
gph.DrawString("月份", new Font("宋體", 12), Brushes.Black, new PointF(cpt.Y+10, cpt.Y+10));
//畫y軸
gph.DrawLine(Pens.Black, cpt.X,cpt.Y,cpt.X,cpt.X);
gph.DrawPolygon(Pens.Black,ypt);
gph.FillPolygon(new SolidBrush(Color.Black),ypt);
gph.DrawString("單位(萬)", new Font("宋體", 12), Brushes.Black, new PointF(0, 7));
for(int i=1;i<=12;i++)
{
//畫y軸刻度
if (i<11)
{
gph.DrawString((i*10).ToString(), new Font("宋體", 11), Brushes.Black, new PointF(cpt.X-30, cpt.Y-i*30-6));
gph.DrawLine(Pens.Black, cpt.X-3,cpt.Y-i*30 ,cpt.X,cpt.Y-i*30);
}
//畫x軸項目
gph.DrawString(month[i-1].Substring(0,1), new Font("宋體", 11), Brushes.Black, new PointF(cpt.X+i*30-5, cpt.Y+5));
gph.DrawString(month[i-1].Substring(1,1), new Font("宋體", 11), Brushes.Black, new PointF(cpt.X+i*30-5, cpt.Y+20));
if(month[i-1].Length>2) gph.DrawString(month[i-1].Substring(2,1), new Font("宋體", 11), Brushes.Black, new PointF(cpt.X+i*30-5, cpt.Y+35));
//畫點
gph.DrawEllipse(Pens.Black,cpt.X+i*30-1.5f,cpt.Y-d[i-1]*3-1.5f,3,3);
gph.FillEllipse(new SolidBrush(Color.Black),cpt.X+i*30-1.5f,cpt.Y-d[i-1]*3-1.5f,3,3);
//畫數值
gph.DrawString(d[i-1].ToString(), new Font("宋體", 11), Brushes.Black, new PointF(cpt.X+i*30,cpt.Y-d[i-1]*3));
//畫折線
if(i>1) gph.DrawLine(Pens.Red,cpt.X+(i-1)*30,cpt.Y-d[i-2]*3,cpt.X+i*30,cpt.Y-d[i-1]*3);
}
//保存輸出圖片
//bmap.Save(Response.OutputStream, ImageFormat.Gif);
PictureBox1.Image = bmap;
}