Question

我试图在Net中编造一个区域,该地区将永远以这种形式出现,但不限于控制,而且通常,这个区域似乎像一个广场,在形式上连续使用 mo,如果在纽顿点上点击“Save”即拯救选定地区,在下一个时间点击特定地区。现在,我对开始这项工作没有任何想法,但如果给我某种想法,就更有助于我为这一功能制定一些法典。没有人会提出我如何能够发挥这一功能,以便我能够着手制定守则?

Answer 1

这并不是我的法典......。选定区域

  public partial class Form1 : Form
        {
            bool canResize;
            int mX, mY;
            Rectangle rect = new Rectangle();

            public Form1()
            {
                InitializeComponent();
            }

            private void Form1_Paint(object sender, PaintEventArgs e)
            {
                e.Graphics.DrawRectangle(new Pen(Brushes.Purple, 2), rect);
            }

            private void Form1_MouseDown(object sender, MouseEventArgs e)
            {
                canResize = true;
                mX = e.X; mY = e.Y;

                rect.Location = new Point(mX, mY);
            }

            private void Form1_MouseUp(object sender, MouseEventArgs e)
            {
                canResize = false;
            }

            private void Form1_MouseMove(object sender, MouseEventArgs e)
            {
                if (canResize)
                {
                    if (mX < e.X)
                    {
                        rect.X = mX;
                        rect.Width = e.X - mX;
                    }
                    else
                    {
                        rect.X = e.X;
                        rect.Width = mX - e.X;
                    }
                    if (mY < e.Y)
                    {
                        rect.Y = mY;
                        rect.Height = e.Y - mY;
                    }
                    else
                    {
                        rect.Y = e.Y;
                        rect.Height = mY - e.Y;
                    }
                    this.Invalidate();
                }
            }
        }

Answer 2

Whether you are programming in WinForms or WPF, you can always catch mouseup and mousedown events, and their respective on-screen locations. You could then ask every element on the stage if any of its corners are within the rectangular area between mouse-up and mouse-down point.

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