我无法选择图片框来绘制它们之间的界限 [英] I can not select pictureboxes to draw line between them
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问题描述
在我的程序中,我有一个列表
的 picturebox
,并且在程序中我按下一个新按钮<将创建code> picturebox 。但是我希望通过 MouseDown
和 MouseUp
在两个选定的图片框之间绘制2行,但不会绘制任何行。 />
这是我的代码:
In my program I have a List
of picturebox
and during the program when I push a button a new picturebox
will be created. But I want to draw 2 lines between two selected pictureboxes by MouseDown
and MouseUp
but no line will be drawn.
Here is my code:
public partial class Form1 : Form
{
int x1, y1, x2, y2, x3, y3, x4, y4;
List<PictureBox> pics = new List<PictureBox>();
PictureBox thisPB;
int i = 0;
int j;
void drawlines(int x1, int y1, int x2, int y2)
{
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.Black,2);
g.DrawLine(p, x1, y1, x1, y2);
g.DrawLine(p, x1, y2, x2, y2);
g.Dispose();
}
private void button1_Click(object sender, EventArgs e)
{
pics.Add(new PictureBox());
pics[i].Name = "pic" + i.ToString();
pics[i].Left = 200 * i;
pics[i].Top = 100 * i;
pics[i].Height = 100;
pics[i].Width = 100;
pics[i].SizeMode = PictureBoxSizeMode.StretchImage;
pics[i].Image = (Image)Properties.Resources.Tulips;
//pics[i].MouseMove += new MouseEventHandler(pic_MouseMove);
pics[i].MouseDown += new MouseEventHandler(pic_MouseDown);
pics[i].MouseUp+=new MouseEventHandler(pic_MouseUp);
this.Controls.Add(pics[i]);
i++;
}
void pic_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
PictureBox thisPB = (PictureBox)sender;
thisPB.Left = e.X;
thisPB.Top = e.Y;
}
}
void pic_MouseDown(object sender, MouseEventArgs e)
{
x3 = e.X;
y3 = e.Y;
//PictureBox thisPB = pics.Find(p => p.Name == pics[pics.IndexOf(p)].Name);
thisPB = (PictureBox)sender;
x1 = (thisPB.Right - thisPB.Left) / 2;
y1 = (thisPB.Top - thisPB.Bottom) / 2;
}
void pic_MouseUp(object sender, MouseEventArgs e)
{
x4 = e.X;
y4 = e.Y;
thisPB = (PictureBox)sender;
//PictureBox thisPB = pics.Find(p => p.Name == pics[pics.IndexOf(p)].Name);
//if (x4 < thisPB.Right)
x2 = (thisPB.Right - thisPB.Left) / 2;
y2 = (thisPB.Top - thisPB.Bottom) / 2;
drawlines(x1, y1, x4, y4);
}
}
如何选择要绘制的图片?
How can I choose a picture to be selected for drawing line?
推荐答案
很多不同的人一次又一次地达成同样的想法真是太棒了。我非常确定:这是可能的,但这是一个真正的死胡同,没有任何实际意义。图片框对你没有任何帮助。
请看我过去的答案: mdi子窗体之间的绘制线 [ ^ ]。
不做感觉?
请参阅这些答案:
捕获面板上的图纸 [ ^ ],
什么样的俏皮方法是Paint? (DataGridViewImageCell.Paint(...)) [ ^ ],
如何加速我的vb.net应用程序? [ ^ ],
如何从旧图纸中清除面板 [ ^ ],
用C#绘制一个矩形 [ ^ ],
在图片框中附加图片 [ ^ ]。
而且,对于更远程的替代品,还要考虑WPF:
连接不同的控件 [ ^ ](再次,询问者出现了想要连接控件),
C#或VB.NET中的CorelDraw或Inkscape等矢量图形软件[ ^ ],
架构图提示 [ ^ ]。
祝你好运,
-SA
It's wonderful how many different people come to the same idea again and again. I'm pretty much sure: this is possible, but this is a really a dead-end approach, making no practical sense. Picture boxes won't help you at all.
Please see my past answer: Drawing Lines between mdi child forms[^].
Doesn't it make sense?
Please see also these answers:
capture the drawing on a panel[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
How to speed up my vb.net application?[^],
How do I clear a panel from old drawing[^],
draw a rectangle in C#[^],
Append a picture within picturebox[^].
And, for more remote alternative, also consider WPF:
Connect different controls[^] (again, the inquirer came up with the idea to connect controls),
Vector graphics software like CorelDraw or Inkscape in C# or VB.NET[^],
Architecture diagram tips[^].
Good luck,
—SA
除了一个小细节之外,您的代码似乎工作正常:图片框的坐标被错误计算。有一个简单的解决方案:
x1或x2 = pic.Left;
y1或y2 = pic.Top;
Your code seems to be working fine except for one small detail: the coordinates of the picturebox are wrongly calculated. There is a simple solution for that:
x1 or x2 = pic.Left;
y1 or y2 = pic.Top;
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