After drawing circles on C# form how can i know on what circle i clicked?
- by SorinA.
I have to represent graphically an oriented graph like in the image below.
i have a C# form, when i click with the mouse on it i have to draw a node. If i click somewhere on the form where is not already a node drawn it means i cliked with the intetion of drawing a node, if it is a node there i must select it and memorize it. On the next mouse click if i touch a place where there is not already a node drawn it means like before that i want to draw a new node, if it is a node where i clicked i need to draw the line from the first memorized node to the selected one and add road cost details.
i know how to draw the circles that represent the nodes of the graph when i click on the form. i'm using the following code:
namespace RepGraficaAUnuiGraf
{
public partial class Form1 : Form
{
Graphics graphDrawingArea;
Bitmap bmpDrawingArea;
Graphics graph;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
bmpDrawingArea = new Bitmap(Width, Height);
graphDrawingArea = Graphics.FromImage(bmpDrawingArea);
graph = Graphics.FromHwnd(this.Handle);
}
private void Form1_Click(object sender, EventArgs e)
{
DrawCentralCircle(((MouseEventArgs)e).X, ((MouseEventArgs)e).Y, 15);
graph.DrawImage(bmpDrawingArea, 0, 0);
}
void DrawCentralCircle(int CenterX, int CenterY, int Radius)
{
int start = CenterX - Radius;
int end = CenterY - Radius;
int diam = Radius * 2;
bmpDrawingArea = new Bitmap(Width, Height);
graphDrawingArea = Graphics.FromImage(bmpDrawingArea);
graphDrawingArea.DrawEllipse(new Pen(Color.Blue), start, end, diam, diam);
graphDrawingArea.DrawString("1", new Font("Tahoma", 13), Brushes.Black, new PointF(CenterX - 8, CenterY - 10));
}
}
}
My question is how can i find out if at the coordinates (x,y) on my form i drew a node and which one is it? I thought of representing the nodes as buttons, having a tag or something similar as the node number(which in drawing should be 1 for Santa Barbara, 2 for Barstow etc.)
