画图问题 求大神帮忙改改 对画图了解甚微啊

Question

c#网格bitmap图片画图

Answer 1

for (int i = 1; i <= fileLen / 0x8000 - 1; i++)
            {
                dotPoint = _getPoint(filepath, i);
                foreach (PointF p in dotPoint)
                {
                    if (_height <= p.Y)
                    {
                        _height = p.Y;
                    }
                }
                for (int j = 0; j < dotPoint.Count; j++)
                {
                    currentPointF.X = (dotPoint[j].X) * (width - 1) / float.Parse(dotPoint.Count.ToString()) + 25;
                    currentPointF.Y = (dotPoint[j].Y) * (height - 1) / _height + 25;
                    listDrawPoints.Add(currentPointF);
                }
            }i从1开始呢？

Answer 2

如果是数据的话，是不是可以换成decimal，精度高

Answer 3

报这个错
加断点跟踪float.Parse(dotPoint.Count.ToString())和_height看看

Answer 4

在_changeToDrawPoints函数中加入以下调试代码，很有可能有除零或溢出的错误：
for (int j = 0; j < dotPoint.Count; j++)
{
    currentPointF.X = (dotPoint[j].X) * (width - 1) / float.Parse(dotPoint.Count.ToString()) + 25;
    currentPointF.Y = (dotPoint[j].Y) * (height - 1) / _height + 25;
    listDrawPoints.Add(currentPointF);    if (_height == 0) MessageBox.Show("divided by zero _height");    // <-- 调试
    if (float.IsNaN(currentPointF.X) || float.IsInfinity(currentPointF.X)) MessageBox.Show("X is wrong"); // <-- 调试
    if (float.IsNaN(currentPointF.Y) || float.IsInfinity(currentPointF.Y)) MessageBox.Show("Y is wrong"); // <-- 调试
}

Answer 5

报这个错
加断点跟踪float.Parse(dotPoint.Count.ToString())和_height看看
打断点开了一下，_height显示的是0，0.3126757E+00得到的结果好像是0，_getPoint里该怎么改啊

Answer 6

_height确实是0，_getPoint函数该怎么改啊

Answer 7

确实是可以的，但是我怎么判断应该放大多少呢？在_getPoint函数里Point pot = new Point(br.ReadInt32(), br.ReadInt32() / 1000);像这组数据0.3126757E+00，我*1000就可以了；0.2537688E-04这组我得*1E+07

Answer 8

我的程序是先根据数据生成一个.wave文件，再生成的.png
.wave文件的部分代码在这里，数据我是一行一行的写的，注释是我新加的，efac函数用来求数量级，好让它们放大或缩小，但我每次都算下数量级的话，一组（一列）数据的数量级可能就不一样了，问题是我怎么获得这一组（一列）数据的数量级？然后在每行写入的时候还能对应相应的数量级啊？String line = null;
                int linenum = 0;                                                                                     //用于暂存 行号.
                Dictionary<string, FileStream> fileStreamList = new Dictionary<string, FileStream>();                //文件流字典           
                string[] filelist = File.ReadAllLines(Tools.PathJoin(TemplateFilepath, parafile), Encoding.UTF8);
                do
                {
                    try
                    {
                        line = filelist[linenum];                                                                    // 一次读取一行数据.
                    }
                    catch (System.Exception ex)
                    {
                    
                    }
                if (linenum == 0)
                    {
                        LineHead = StringSplit(line);                                                                //遍历结果文件的头信息
                        string _head = "";
                        if (headflag)
                            headName = new StreamWriter(Tools.PathJoin(ModuleName, "HeadName.rinfo"), false, Encoding.UTF8);
                        for (int i = 1; i < LineHead.Count; i++)
                        {
                            FileStream fs = new FileStream(Tools.PathJoin(ModuleName, parafilename, LineHead[i] + ".wave"), FileMode.Create, FileAccess.Write);
                            if (headflag)
                                _head += LineHead[i] + ",";
                            fileStreamList.Add(LineHead[i], fs);
                        }
                if (headflag)
                        {
                            headName.Write(_head.Trim(','));
                            headflag = false;
                            headName.Close();
                        }
                    }
                else
                    {
                        if (line != null)
                        {
                            List<string> datalist = StringSplit(line);
                            for (int i = 1; i < datalist.Count; i++)
                            {
                                fileWrite = fileStreamList[LineHead[i]];
                                bw = new BinaryWriter(fileWrite);
                                bw.BaseStream.Seek(0, SeekOrigin.End);                                              //数据流指针移到最后    
                                bw.Write((int)(float.Parse(datalist[0])));
                                bw.Write((int)(float.Parse(datalist[i]) * 1000));
                                //int e = efac(float.Parse(datalist[i]));
                                //bw.Write((int)(float.Parse(datalist[i]) * (int)Math.Pow(10, 2 - e) * 1000));
                            }
                        }
                    }
                linenum++;                                    

Answer 9

这些数据是用科学技术法表示的，这种表示法是0.xxxxxE+xx或0.xxxxxE-xx的形式，你可以在判断时先转为字符串，然后找到“E”，根据后面的+或-和数字就能知道是放大或缩小,以及倍数了
 也可以你的数据先放大或缩小，从小到大的倍数循环试，如先*10，再*100，*1000等，直到能正常运算（不抛异常了），
也许高人有更好的处理方法，期待中.......

Answer 10

40分http://bbs.csdn.net/topics/390721952
20分http://bbs.csdn.net/topics/390721857?page=1#post-396876680
一共160分，求解决该问题