Scribble with Mouse
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
public class frmScribble : System.Windows.Forms.Form {
private System.ComponentModel.Container components = null;
private bool mouseDown = false;
private Point lastPoint = Point.Empty;
private string color = "black";
private Graphics g;
private Pen p;
public frmScribble() {
g = CreateGraphics();
p = new Pen(Color.FromName(color));
}
protected override void OnMouseDown(MouseEventArgs e) {
mouseDown = true;
if (e.Button == MouseButtons.Right) {
ContextMenu m = new ContextMenu();
m.MenuItems.Add(0, new MenuItem("black", new EventHandler(RightMouseButton_Click)));
m.MenuItems.Add(1, new MenuItem("white", new EventHandler(RightMouseButton_Click)));
m.MenuItems.Add(2, new MenuItem("red", new EventHandler(RightMouseButton_Click)));
m.MenuItems.Add(3, new MenuItem("green", new EventHandler(RightMouseButton_Click)));
m.MenuItems.Add(4, new MenuItem("blue", new EventHandler(RightMouseButton_Click)));
m.Show(this, new Point(e.X, e.Y));
}
}
protected void RightMouseButton_Click(object sender, EventArgs e) {
color = ((MenuItem)sender).Text;
p = new Pen(Color.FromName(color));
}
protected override void OnMouseUp(MouseEventArgs e) {
mouseDown = false;
}
protected override void OnMouseMove(MouseEventArgs e) {
if (lastPoint.Equals(Point.Empty)) lastPoint = new Point(e.X, e.Y);
if (mouseDown) {
Point pMousePos = new Point(e.X, e.Y);
g.DrawLine(p, pMousePos, lastPoint);
}
lastPoint = new Point(e.X, e.Y);
}
[STAThread]
static void Main() {
Application.Run(new frmScribble());
}
}
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