鼠标单击的点显示为*并与线交会处，它将给出消息. [英] mouse click point show as * and meet line then it will give messege.

问题描述

亲爱的朋友，
我有此代码用于画线到图片框，现在我想当用户单击图片框，然后将微粒点显示为星点(例如*，@ ,.)作为点显示.

2.并且我希望每当它越界时它就会发出警报，我正在尝试bt无法正常工作.

dear friends ,
i have this code for drawline over to picturebox and now i want when user click the picturebox then particuler point show as a starpoint(like *,@,.) show as a point.

2. And i want whenever it cross the line then it will give the alert , i am trying bt not work properly.

private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
        {
                 

            pointArray[iNumberofClicks].X = e.X;
            pointArray[iNumberofClicks].Y = e.Y;
            Pen PenSpikes = new Pen(Color.Green);
            SolidBrush solidBrush = new SolidBrush(Color.Blue);

            if(iNumberofClicks==0)
            {
                 a = e.X;
                 b = e.Y;
            }

            iNumberofClicks++;
            if (iNumberofClicks > 1)
            {
                Point[] CurrentpointArray = new Point[iNumberofClicks];

                for (int aa = 0; aa < iNumberofClicks; aa++)
                {
                    CurrentpointArray[aa].X = pointArray[aa].X;
                    CurrentpointArray[aa].Y = pointArray[aa].Y;

                }

               
               Graphics offScreenDC = Graphics.FromImage(pictureBox1.Image);
                offScreenDC.DrawLines(PenSpikes, CurrentpointArray);
                offScreenDC.Dispose();
                pictureBox1.Refresh();
                
               
}
}
for (int j = 1; j < CurrentpointArray.Length;j++ )
              {
                  if ((Convert.ToInt16(CurrentpointArray[j].X) == a && Convert.ToInt16(CurrentpointArray[j].Y) == b) )
                  {
                      MessageBox.Show("alert");
                      break;
                  }
              }

推荐答案

您应该从不使用PictureBox开始解决此问题.它仅在最简单的情况下才有用，当您尝试进行更高级的操作时会变得很麻烦.

我在过去的答案中对此进行了解释:
如何从旧图纸中清除面板 [ ^ ]，
在C#中绘制矩形 [在图片框内添加图片 [在mdi子表单之间画线 [在面板上捕获图形 [ Paint是一种哪种好玩的方法? (DataGridViewImageCell.Paint(...)) [

You should start solving this problem from not using PictureBox. It is useful only in some simplest cases and becomes a hassle when you try to do something more advanced.

I explain it in my past answers:
How do I clear a panel from old drawing[^],
draw a rectangle in C#[^],
Append a picture within picturebox[^].

Some more detailed explanations on what to do instead in my past answers:
Drawing Lines between mdi child forms[^],
capture the drawing on a panel[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^].

—SA

这篇关于鼠标单击的点显示为*并与线交会处，它将给出消息.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！