因为线图像startline有了起点和终点，我们就可以用DDA法求出线上所有点，任意斜率直线通过四象限八区域查表法界定。我们只示范一个区域：函数为： public PointF DdaFindPtImprove(ref byte[] buffer8, PointF Start, PointF End, int thresDelta, int Dir,Size wh,ref int Pos)//thresDelta门槛值，Pos线图像中穿越点index
{ float x, y;
float dx, dy, k;
PointF backPoint = new PointF();
dx = (float)(End.X - Start.X);
dy = (float)(End.Y - Start.Y);
k = dy / dx;
if (Math.Abs(dx) < 0.001)
{
k = 65535;//随意给定一个最大值，还需论证。20150727，够用
}
x = Start.X;
if (Start.Y < 0) Start.Y = 0;
y = Start.Y;
List<float> temparrclor = new List<float>(); // 线图像上每一个点灰度颜色
List<PointF> position = new List<PointF>();//线图像上每一个点坐标
#region xiaoyu1
if (Math.Abs(k) < 1)
{
if (x > End.X)
{
for (; x >= End.X; x--)//x是整型，y是浮点型
{
float j = y;
int i = (int)(x);
float tempf = Math.Abs(j - (int)j);
PointF tempPt = new PointF(i, j);
float grey = 0;
if (k > -1 && k <= 0)
{
float avgGrey = (float)buffer8[(int)j * wh.Width + i];
float avgGrey1 = (float)buffer8[((int)j + 1) * wh.Width + i];
grey = avgGrey * (1 - tempf) + avgGrey1 * tempf;//灰度插值方法
}
else
{
float avgGrey = (float)buffer8[(int)j * wh.Width + i];
float avgGrey1 = (float)buffer8[((int)j - 1) * wh.Width + i];
grey = avgGrey * (1 - tempf) + avgGrey1 * tempf;
}
temparrclor.Add(grey);//插值灰度
position.Add(tempPt);
y = y - k;
}
backPoint = FindCrosspointimprove(ref temparrclor, ref position, Dir, thresDelta,ref Pos);//找穿越点
}
else {.......}
}
#endregion xiaoyu1
........ return backPoint;}
public PointF FindCrosspointimprove(ref List<float> lineTiDu, ref List<PointF> ijRecord, int Dir, int thresDelta,ref int POS)
{//梯度和求穿越点，使用五个一组，与所讲略有差别
List<float> deltatemp = new List<float>();
List<float> fenzuaverage = new List<float>();
for (int i = 0; i < lineTiDu.Count - 1; i++)
{
float grey1 = lineTiDu[i + 1];
float delta = (lineTiDu[i] - grey1);
if (Math.Abs(delta) < 5)
delta = 0;
deltatemp.Add(delta);
}
int fenzuC = deltatemp.Count / 5;
for (int i = 0; i < fenzuC * 5; i = i + 5)
{
float sum5 = deltatemp[i] + deltatemp[i + 1] + deltatemp[i + 2] + deltatemp[i + 3] + deltatemp[i + 4];
float aver = sum5 / 5;
if (Math.Abs(aver) < 5)
aver = 0;
fenzuaverage.Add(aver);
}
if (fenzuaverage.Count == 0) return new PointF();
int crosspoint = 0;
int crosspoint1 = 0;
if (Dir == 0)
{
for (int iii = fenzuaverage.Count - 1; iii >= 0; iii--)//排除起点和终点
{
if (fenzuaverage[iii] > 0)
{
crosspoint = 5 * (iii);
break;
}
}
float maxVar = deltatemp[crosspoint];
for (int m = -5; m < 5; m++)
{
int tempint = crosspoint + m;
if (crosspoint == 0)
tempint = 0;
if (deltatemp[tempint] >= maxVar)//白到黑，加入方向判别
{
maxVar = deltatemp[tempint];
crosspoint1 = tempint;
}
}
}
if (Dir == 1)
{
for (int iii =0 ; iii <= fenzuaverage.Count - 1; iii++)//排除起点和终点
{
if (fenzuaverage[iii] < 0)
{
crosspoint = 5 * (iii);
break;
}
}
// minVar = deltatemp[crosspoint];
float minVar = deltatemp[crosspoint];
for (int m = -5; m < 5; m++)
{
int tempint = crosspoint + m;
if (crosspoint == 0)
tempint = 0;
if (deltatemp[tempint] <= minVar)//白到黑，加入方向判别
{
minVar = deltatemp[tempint];
crosspoint1 = tempint;
}
}
}
if (fenzuaverage[crosspoint / 5] * 5 >= thresDelta || fenzuaverage[crosspoint / 5] * 5 <= -thresDelta)
{
POS = crosspoint1;//穿越点的index在线图像序列中
return ijRecord[crosspoint1];//穿越点的index对应坐标
}//门槛判别
else
{
return new PointF();//没有穿越点，返回（0,0）
}
}
一切准备就绪，在private void pictureBoxRoiImg_Paint(object sender, PaintEventArgs e)调用
if (m_btempImage3 == true)//截取的ROI图像
{
PointF startxy = m_线图像.m_RoiBase.startLine.pt_start;
PointF endxy = m_线图像.m_RoiBase.startLine.pt_end;
PointF returnpoint = DdaFindPtImprove(ref tempImage3, startxy,
endxy, 门槛值, glob_Dir, new Size(_RoiW, _RoiH), ref pos);
p = new Pen(Color.Red, 1);//画出穿越点叉叉
g.DrawLine(p, new PointF(returnpoint.X, returnpoint.Y - 3), new PointF(returnpoint.X, returnpoint.Y + 3));
g.DrawLine(p, new PointF(returnpoint.X - 3, returnpoint.Y), new PointF(returnpoint.X + 3, returnpoint.Y));
}
到此，线图像设计完成。下一节讲一组线图像组成找线工具。（待续..............）以下是运行后线图像工具效果：
# See smb.conf.example for a more detailed config file or
# read the smb.conf manpage.
# Run 'testparm' to verify the config is correct after
# you modified it.
[global]
workgroup = SAMBA
security = user
passdb backend = tdbsam
map to guest = Bad User
printing = cups
printcap name = cups
load printers = yes
cups options = raw
[homes]
comment = Home Directories
valid users = %S, %D%w%S
browseable = No
read only = No
inherit acls = Yes
[printers]
comment = All Printers
path = /var/tmp
printable = Yes
create mask = 0600
browseable = No
[print$]
comment = Printer Drivers
path = /var/lib/samba/drivers
write list = @printadmin root
force group = @printadmin
create mask = 0664
directory mask = 0775
[rpt]
path = /rpt_data
comment = temp Directories
writable = yes
browseable = yes
guest ok = yes
:s/well/good/ 替换当前行第一个 well 为 good
:s/well/good/g 替换当前行所有 well 为 good
:n,$s/well/good/ 替换第 n 行开始到最后一行中每一行的第一个 well 为 good
:n,$s/well/good/g 替换第 n 行开始到最后一行中每一行所有 well 为 good
n 为数字，若 n 为 .，表示从当前行开始到最后一行
:%s/well/good/ （等同于 :g/well/s//good/） 替换每一行的第一个 well 为 good
:%s/well/good/g （等同于 :g/well/s//good/g） 替换每一行中所有 well 为 good
特殊符号转义：可以使用 # 作为分隔符，此时中间出现的 / 不会作为分隔符
:s#well/#good/# 替换当前行第一个 well/ 为 good/
:%s#/usr/bin#/bin#g 可以把文件中所有路径/usr/bin换成/bin
* 可能遇到的问题：
1. 黑窗口一闪而过：
* 原因： 没有正确配置JAVA_HOME环境变量
* 解决方案：正确配置JAVA_HOME环境变量
2. 启动报错：
1. 暴力：找到占用的端口号，并且找到对应的进程，杀死该进程
* netstat -ano
2. 温柔：修改自身的端口号(不建议使用)