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| public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
pictureBox1.Refresh();
}
public List<Line> line = new List<Line>();
bool draw = false;
public class Line
{
private Pen pen;
public Point start;
public Point end;
public bool isSelected = false;
public bool appartient(Point p)
{
int a = 0;
if ((end.X - start.X) != 0)
a = (end.Y - start.Y) / (end.X - start.X);
int b = end.Y - (a * end.X);
if (((p.Y == (a * p.X + b))))
{
isSelected = true;
return true;
}
else
{
isSelected = false;
return false;
}
}
public Line(Pen pen, Point start, Point end)
{
this.pen = pen;
this.start = start;
this.end = end;
}
public void OnPaint(Graphics g)
{
g.DrawLine(new Pen(Brushes.Black), start, end);
//rectangle for line selection
if (isSelected)
{
g.FillRectangle(Brushes.Gray, new Rectangle(start, new Size(5, 5)));
g.DrawRectangle(pen, new Rectangle(start.X - 3, start.Y - 3, 6, 6));
g.FillRectangle(Brushes.Gray, new Rectangle(end, new Size(5, 5)));
g.DrawRectangle(pen, new Rectangle(end.X - 3, end.Y - 3, 6, 6));
}
}
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
draw = true;
line.Add(new Line(new Pen(Brushes.Blue), e.Location, e.Location));
Invalidate();
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (draw)
{
line[line.Count - 1].end = e.Location;
Invalidate();
label1.Text = "souris enfonce";
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (draw)
{
line[line.Count - 1].end = e.Location;
draw = false;
label1.Text = "souris lache";
}
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
foreach (Line m in line)
{
m.OnPaint(e.Graphics);
Invalidate();
label1.Text = "trace";
}
}
}
} |
