Click on the form to draw curve
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;
public class Form1 : System.Windows.Forms.Form{
private Point[] thePoints;
private int counter;
public Form1() {
Console.WriteLine("click on the form to draw curve");
InitializeComponent();
thePoints = new Point[1000];
for (int i=0;i<thePoints.Length; i++)
thePoints[i] = new Point(0,0);
counter =0;
}
protected override void OnPaint (PaintEventArgs e) {
if (counter==0)
return;
Pen redPen = new Pen(Color.Red, 3);
Pen greenPen = new Pen(Color.Red, 4);
Point[] curvePoints = new Point[counter];
for (int i=0; i<curvePoints.Length;i++)
{
curvePoints[i] = new Point(0,0);
curvePoints[i].X = thePoints[i].X;
curvePoints[i].Y = thePoints[i].Y;
}
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.DrawCurve(greenPen, curvePoints);
}
private void InitializeComponent() {
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Name = "Form1";
this.Text = "Form1";
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
}
static void Main() {
Application.Run(new Form1());
}
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) {
thePoints[counter].X = e.X;
thePoints[counter].Y = e.Y;
Label l = new Label();
this.SuspendLayout();
counter++;
if (counter>4)
this.Refresh();
}
}
Related examples in the same category
