1 //描绘曲线 //创建曲线中的点 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(点阵,起点,终点,弯曲程度) myPath.AddCurve(curvePoints, 0, 7, 0.8f); Pen myPen = new Pen(Color.Red, 1); IMG.DrawPath(myPen, myPath); --------------------------------------------------------------------------------------------- 2 c#.net画曲线图(坐标) using System.Drawing.Imaging; using System.Drawing.Drawing2D; //数据/月份 public ArrayList arrData=new ArrayList(); public ArrayList arrMonth=new ArrayList(); //定义幕布高宽 private int iCanvasWidth=400; private int iCanvasHeight=300; //x轴的间距 private int iX=30; //y轴间距 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 画线 // 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; //坐标轴 g.DrawLine(pen,20,220,420,220); g.DrawLine(pen,20,220,20,20); //x轴标格 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轴标格 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; } } } } ------------------------------------------------------------------------------------------------------- 在.net中,微软给我们提供了画图类(system.drawing.imaging),在该类中画图的基本功能都有。比如:直线、折线、矩形、多边形、椭圆形、扇形、曲线等等,因此一般的图形都可以直接通过代码画出来。接下来介绍一些画图函数: Bitmap bmap=new Bitmap(500,500) /定义图像大小; bmap.Save(stream,imagecodecinfo) /将图像保存到指定的输出流; Graphics gph /定义或创建gdi绘图对像; PointF cpt /定义二维平面中x,y坐标; DrawString(string,font,brush,ponitf) /用指定的brush和font对像在指定的矩形或点绘制指定的字符串; DrawLine(pen,ponit,ponit) /用指定的笔(pen)对像绘制指定两点之间直线; DrawPolygon(pen,ponit[]) /用指定的笔(pen)对像绘制指定多边形,比如三角形,四边形等等; FillPolygon(brush,ponit[]) /用指定的刷子(brush)对像填充指定的多边形; DrawEllipse(pen,x,y,width,height) /用指定的笔绘制一个边框定义的椭圆; FillEllipse(brush,x,y,width,height) /用指定的刷子填充一个边框定义的椭圆; DrawRectangle(pen,x,y,width,height) /用指定的笔绘制一个指定坐标点、宽度、高度的矩形; DrawPie(pen,x,y,width,height,startangle,sweepangle) /用指定的笔绘制一个指定坐标点、宽度、高度以及两条射线组成的扇形; 下面的例子可以画出一个折线图,代码如下: 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}; //画图初始化 Bitmap bmap=new Bitmap(500,500); Graphics gph=Graphics.FromImage(bmap); gph.Clear(Color.White); PointF cpt=new PointF(40,420);//中心点 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 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 gph.DrawString("某工厂某产品月生产量图表", new Font("宋体", 14), Brushes.Black, new PointF(cpt.X+60, cpt.X));//图表标题 //画x轴 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("宋体", 12), Brushes.Black, new PointF(cpt.Y+10, cpt.Y+10)); //画y轴 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("单位(万)", new Font("宋体", 12), Brushes.Black, new PointF(0, 7)); for(int i=1;i<=12;i++) { //画y轴刻度 if (i<11) { gph.DrawString((i*10).ToString(), new Font("宋体", 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); } //画x轴项目 gph.DrawString(month[i-1].Substring(0,1), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X+i*30-5, cpt.Y+5)); gph.DrawString(month[i-1].Substring(1,1), new Font("宋体", 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("宋体", 11), Brushes.Black, new PointF(cpt.X+i*30-5, cpt.Y+35)); //画点 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); //画数值 gph.DrawString(d[i-1].ToString(), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X+i*30,cpt.Y-d[i-1]*3)); //画折线 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); } //保存输出图片 //bmap.Save(Response.OutputStream, ImageFormat.Gif); PictureBox1.Image = bmap; } |
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