如何使用C＃扩展两行以满足彼此 [英] How to extend two lines to meet each other using C#

问题描述

我使用Windows窗体绘制了几行。



但是我希望通过扩展这些行来加入行。



有没有办法用Windows窗体扩展线



这里我的代码

  for （ int  count =  0 ; count <   1 ; count ++）
 {
  int  x1 = polyPt [ 0 ]。X; 
  int  y1 = polyPt [ 0 ]。Y; 
  int  x2 = polyPt [polyPt.Length-1] .X; 
  int  y2 = polyPt [polyPt.Length-1] .Y; 
 
  var  L = Math.Sqrt（（x1  -  x2）*（x1  -  x2）+（y1  -  y2）*（y1  - Y2））; 
 
  var  offsetPixels = -15。 0 ; 
 
 
  int  x1p = Convert.ToInt32（x1 + offsetPixels *（y2-y1）/ L）; 
  int  x2p = Convert.ToInt32（x2 + offsetPixels *（y2-y1）/ L）; 
  int  y1p = Convert.ToInt32（y1 + offsetPixels *（x1  -  x2）/ L）; 
  int  y2p = Convert.ToInt32（y2 + offsetPixels *（x1  -  x2）/ L）; 
 
 
 graphics.DrawLine（ new  Pen（Color.Red）， new  Point（x1p，y1p）， new  Point（x2p，y2p））; 
} 
 

解决方案

您的示例代码只显示一行 - 因此您无法扩展它什么都可以。

但如果你有两条线，那就很简单了。您所需要的只是两者相遇的点，这很容易计算： http://social.msdn.microsoft.com/Forums/vstudio/en-US/4eb3423e-eb81-4977-8ce5- 5a568d53fd9b / get-the-intersection-of-two-lines？forum = vbgeneral [ ^ ] - 代码在VB，但很明显。

最简单的方法是使用DrawLines mehtod。这需要一组点而不是单个点。前两个代表第一个线段。连续点添加从最后一点到新点的线段。



以下将绘制一个正方形：

钢笔= 新笔（Color.Black， 3  ）; 
 
 Point [] points = {
  new  Point（ 100  ， 100 ），
  new 点（ 200 ， 100 ），
  new  Point（ 200 ， 200 ），
  new 点（ 100 ， 200 ），
  new 点（ 100 ， 100 ）
}; 
 
 graphics.DrawLines（笔，分）; 

应该足够的信息适用于你的原件问题

I have drawn few lines using windows forms.

But I want to join lines by extending those line.

Is there any way to extend lines using windows forms

Here my code

for (int count = 0; count < 1; count++)
               {
                   int x1 = polyPt[0].X;
                   int y1 = polyPt[0].Y;
                   int x2 = polyPt[polyPt.Length-1].X;
                   int y2 = polyPt[polyPt.Length-1].Y;

                   var L = Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));

                   var offsetPixels = -15.0;


                   int x1p = Convert.ToInt32(x1 + offsetPixels * (y2 - y1) / L);
                   int x2p = Convert.ToInt32(x2 + offsetPixels * (y2 - y1) / L);
                   int y1p = Convert.ToInt32(y1 + offsetPixels * (x1 - x2) / L);
                   int y2p = Convert.ToInt32(y2 + offsetPixels * (x1 - x2) / L);


                   graphics.DrawLine(new Pen(Color.Red), new Point(x1p, y1p), new Point(x2p, y2p));
               }

解决方案

Your example code only shows one line - so you can't "extend" it to meet anything.
But if you do have two lines, it's pretty simple. All you need is the point at which the two meet, which is easy to calculate: http://social.msdn.microsoft.com/Forums/vstudio/en-US/4eb3423e-eb81-4977-8ce5-5a568d53fd9b/get-the-intersection-point-of-two-lines?forum=vbgeneral[^] - the code is in VB, but it's pretty obvious.

The easiest way is to use the DrawLines mehtod. This expects an array of points rather than individual points. The first two represent the first line segment. Successive points add line segments from the last point to the new point.

The following would draw a square:

Pen pen = new Pen(Color.Black, 3);

Point [] points = { 
    new Point(100, 100), 
    new Point(200, 100), 
    new Point(200, 200), 
    new Point(100, 200),
    new Point(100, 100)
};

graphics.DrawLines(pen, points);

That should be enough info to apply to your original problem.

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