这是我Form1中的所有事件和功能，我该怎么办？ 我需要检测pictureBox1控件的边框/边界，并在触摸边框时停止鼠标移动。
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
label1.Text = e.X.ToString();
label2.Text = e.Y.ToString();
label1.Visible = true;
label2.Visible = true;
label3.Visible = true;
label4.Visible = true;
// find the index that is closest to the current mouse location
MinDist = float.MaxValue;
for (idx = 0; idx < Point_X.Count; ++idx)
{
float dx = Point_X[idx] - e.X;
float dy = Point_Y[idx] - e.Y;
float dist = (float)Math.Sqrt(dx * dx + dy * dy);
if (dist < MinDist)
{
MinDist = dist;
selectedIndex = idx;
}
}
if (MinDist < 5)
{
mouseMove = true;
OriginalX = Point_X[(int)selectedIndex];
OriginalY = Point_Y[(int)selectedIndex];
if (cyclicSelectedIndex.Count() == 2)
{
cyclicSelectedIndex[currentCyclicIndex] = (int)selectedIndex;
currentCyclicIndex++;
if (currentCyclicIndex > 1)
{
currentCyclicIndex = 0;
}
if ((cyclicSelectedIndex[0] == cyclicSelectedIndex[1]) || (cyclicSelectedIndex[0] == -1) || (cyclicSelectedIndex[1] == -1))
{
button2.Enabled = false;
}
else
{
button2.Enabled = true;
}
label13.Text = selectedIndex.ToString();
label13.Visible = true;
label14.Visible = true;
listView1.Items.Add(selectedIndex.ToString()).EnsureVisible();
}
}
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (mouseMove == true)
{
Point NewPoint = e.Location;
Point_X[(int)selectedIndex] = NewPoint.X;
Point_Y[(int)selectedIndex] = NewPoint.Y;
label1.Text = NewPoint.X.ToString();
label2.Text = NewPoint.Y.ToString();
pictureBox1.Refresh();
Point_X[(int)selectedIndex] = Math.Max(pictureBox1.Left, Math.Min(pictureBox1.Right, NewPoint.X));
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (mouseMove == true)
{
Point NewPoint = e.Location;
Point_X[(int)selectedIndex] = NewPoint.X;
Point_Y[(int)selectedIndex] = NewPoint.Y;
mouseMove = false;
}
}
private void button1_Click(object sender, EventArgs e)
{
halfX = pictureBox1.ClientRectangle.Width / 2;
halfY = pictureBox1.ClientRectangle.Height / 2;
Random rnd = new Random();
offsetX = rnd.Next(-10, 10);
offsetY = rnd.Next(-10, 10);
addPoint(halfX + offsetX, halfY + offsetY);
pictureBox1.Refresh();
numberOfPoints++;
label16.Text = numberOfPoints.ToString();
label16.Visible = true;
label15.Visible = true;
}
private void addPoint(float x , float y)
{
Point_X.Add(x);
Point_Y.Add(y);
label5.Text = x.ToString();
label6.Text = y.ToString();
label5.Visible = true;
label6.Visible = true;
label7.Visible = true;
label8.Visible = true;
}
private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Point connectionPointStart;
Point connectionPointEnd;
Graphics g = e.Graphics;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
SolidBrush brush = new SolidBrush(Color.Red);
Pen p = new Pen(brush);
for (int idx = 0; idx < Point_X.Count; ++idx)
{
Point dPoint = new Point((int)Point_X[idx], (int)Point_Y[idx]);
dPoint.X = dPoint.X - 5; // was - 2
dPoint.Y = dPoint.Y - 5; // was - 2
Rectangle rect = new Rectangle(dPoint, new Size(10, 10));
g.FillEllipse(brush, rect);
}
for (int i = 0; i < connectionStart.Count; i++)
{
int startIndex = connectionStart[i];
int endIndex = connectionEnd[i];
connectionPointStart = new Point((int)Point_X[startIndex], (int)Point_Y[startIndex]);
connectionPointEnd = new Point((int)Point_X[endIndex], (int)Point_Y[endIndex]);
p.Width = 4;
g.DrawLine(p, connectionPointStart, connectionPointEnd);
}
}
private void button2_Click(object sender, EventArgs e)
{
addConnection(cyclicSelectedIndex[0], cyclicSelectedIndex[1]);
pictureBox1.Invalidate();
}
private void addConnection(int i, int j)
{
if (cyclicSelectedIndex[0] == -1)
{
return;
}
if (cyclicSelectedIndex[0] == cyclicSelectedIndex[1])
{
return;
}
if (connectionStart.Count() == 0)
{
connectionStart.Add(i);
connectionEnd.Add(j);
//label12.Text = i.ToString();
//label11.Text = j.ToString();
label12.Text = connectionStart[0].ToString();
label11.Text = connectionEnd[0].ToString();
label9.Visible = true;
label10.Visible = true;
label11.Visible = true;
label12.Visible = true;
return;
}
for (int f = 0; f < connectionStart.Count(); f++)
{
if ((connectionStart[f] == i && connectionEnd[f] == j) || (connectionStart[f] == j && connectionEnd[f] == i)) // this checking dosent work good !
{
button2.Enabled = false;
return;
}
else
{
label12.Text = connectionStart[f].ToString();
label11.Text = connectionEnd[f].ToString();
label9.Visible = true;
label10.Visible = true;
label11.Visible = true;
label12.Visible = true;
}
}
connectionStart.Add(i);
connectionEnd.Add(j);
}
我不确定如何解释它。但我怎么能这样做呢？
感谢。
答案 0 :(得分：0)
计算X值时，使用Math.Max和图像的左边界，以及Min在图像的右边界。对顶部和底部的Y值执行相同的操作。
Point_X[(int)selectedIndex] = Math.Max(imageLeft, Math.Min(imageRight, NewPoint.X));
我假设您可以确定图像的左/右/上/下？