I want to click on points that I drew.
It would be also cool if a window would popup and I could do something with that. But the general thing i want to do is clicking on a drawn point . I want to make it work, that i can click on the map on points that I drew.
Example image:
public partial class Form1 : Form
{
Graphics g;
Pen p;
Point cursor;
int k = 0;
Point[] points = new Point[50];
public Form1()
{
InitializeComponent();
g = pbxkarte.CreateGraphics();
p = new Pen(Color.DeepSkyBlue, 3);
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Pbxkarte_Click(object sender, EventArgs e)
{
if (drawmodecbx.Checked == true)
{
g.DrawEllipse(p, cursor.X - 10, cursor.Y - 10, 20, 20);
points[k++] = new Point(cursor.X, cursor.Y);
lbxDrawnPoints.Items.Add("X:" + cursor.X + "Y:" + cursor.Y);
}
}
private void Pbxkarte_MouseMove(object sender, MouseEventArgs e)
{
cursor = this.PointToClient(Cursor.Position);
xydisplay.Text = "X:" + cursor.X + "Y:" + cursor.Y;
}
}
}
Example code:
Two class level variables and a helper function:
List<Point> dots = new List<Point>();
int dotSize = 12;
Rectangle fromPoint(Point pt, int size)
{
return new Rectangle(pt.X - size/ 2, pt.Y - size / 2, size, size);
}
The mouseclick (as opposed to the click event) contains the location:
private void Pbxkarte_MouseClick(object sender, MouseEventArgs e)
{
if (!dots.Contains(e.Location))
{
dots.Add(e.Location);
Pbxkarte.Invalidate(); // show the dots
}
}
You could add code to remove dots or change the properties, esp. if you create a dot class. - If you want to avoid overlapping dots you can to use code like the one in the mousemove to detect this. But. Don't repeat the code! Instead factor out a boolOrPoint IsDotAt(Point)
function you can use both times!!
In the mousemove I only show the hit state. You do your thing..
private void Pbxkarte_MouseMove(object sender, MouseEventArgs e)
{
bool hit = false;
foreach (var dot in dots)
{
using (GraphicsPath gp = new GraphicsPath())
{
gp.AddEllipse(fromPoint(dot, dotSize));
if (gp.IsVisible(e.Location))
{
hit = true; break;
}
}
}
Cursor = hit ? Cursors.Hand : Cursors.Default;
}
All dot in the list must get shown every time anything changes, both in the list or in the system.:
private void Pbxkarte_Paint(object sender, PaintEventArgs e)
{
foreach (var dot in dots)
{
using (GraphicsPath gp = new GraphicsPath())
{
gp.AddEllipse(fromPoint(dot, dotSize));
e.Graphics.FillPath(Brushes.Red, gp);
}
}
}
If you want more properties, like texts or colors do create a class dot
and use a List<dot>
!
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.