After my signature you'll find a scribble like application that handles
mouse, click and paint events to create a scribble like program.
Have fun...
--
Bob Powell [MVP]
Visual C#, System.Drawing
The Image Transition Library wraps up and LED style instrumentation is
available in the June of Well Formed for C# or VB programmers
http://www.bobpowell.net/currentissue.htm
Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm
The GDI+ FAQ RSS feed:
http://www.bobpowell.net/faqfeed.xml
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http://www.bobpowell.net/tipstricks.xml
Bob's Blog:
http://bobpowelldotnet.blogspot.com/atom.xml
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using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;
namespace Scribbler
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows. Forms.Form
{
//array used to store arrays of points.
ArrayList items=new ArrayList();
//The line under construction.
ArrayList line;
/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.Containe r components = null;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeCompo nent();
this.SetStyle(C ontrolStyles.Al lPaintingInWmPa int |
ControlStyles.U serPaint |
ControlStyles.D oubleBuffer,
true);
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(800, 600);
this.MouseUp += new
System.Windows. Forms.MouseEven tHandler(this.f orm1_MouseUp);
this.MouseMove += new
System.Windows. Forms.MouseEven tHandler(this.f orm1_MouseMove) ;
this.MouseDown += new
System.Windows. Forms.MouseEven tHandler(this.f orm1_MouseDown) ;
this.Paint += new System.Windows. Forms.PaintEven tHandler(this.f orm1_Paint);
this.Name = "Form1";
this.Text = "Form1";
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run (new Form1());
}
//a semaphore used to store the state of the mouse button
bool _drawing;
//Draws the lines in the items array and the one under construction.
private void form1_Paint(obj ect sender, System.Windows. Forms.PaintEven tArgs
e)
{
foreach(Point[] pa in items)
{
if(pa.Length>0)
{
if(pa.Length==1 )
{
e.Graphics.Draw Line(Pens.Black ,pa[0],pa[0]);
}
else
e.Graphics.Draw Lines(Pens.Blac k,pa);
}
}
//If a new line is under construction draw it too for the benefit of the
user.
if(_drawing)
{
if(line.Count>1 )
{
Point[] pts=new Point[line.Count];
line.CopyTo(pts ,0);
e.Graphics.Draw Lines(Pens.Blac k,pts);
}
}
}
//Begins drawing a new line
private void form1_MouseDown (object sender,
System.Windows. Forms.MouseEven tArgs e)
{
_drawing=true;
line=new ArrayList();
}
//When drawing a line this accumulates points in the line array
//Note that no drawing is performed.
private void form1_MouseMove (object sender,
System.Windows. Forms.MouseEven tArgs e)
{
if(_drawing)
{
this.line.Add(n ew Point(e.X,e.Y)) ;
Invalidate();
}
}
//Ends accumulating a new line by creating a new point array and storing it
with the ones already completed
private void form1_MouseUp(o bject sender,
System.Windows. Forms.MouseEven tArgs e)
{
_drawing=false;
line.Add(new Point(e.X,e.Y)) ;
Point[] pts=new Point[line.Count];
line.CopyTo(pts ,0);
items.Add(pts);
Invalidate();
}
}
}
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-----------------------
"Serge Klokov" <Su*********@we b.de> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..
Hi!
1. Please, help with example "paint on form by mouse"
2. Below is my example, but it clear the line after each Refresh()... how
to fix?
3. How to draw the line in Mouse_Move event?
private Boolean isCanPaint = false;
private MouseEventArgs MouseEvent1;
private MouseEventArgs MouseEvent2;
private void Form1_MouseDown (object sender,
System.Windows. Forms.MouseEven tArgs e)
{
MouseEvent1 = e;
label1.Text = "X = " + e.X.ToString() + " ; Y = " + e.Y.ToString();
}
private void Form1_MouseUp(o bject sender,
System.Windows. Forms.MouseEven tArgs e)
{
MouseEvent2 = e;
label2.Text = "X = " + e.X.ToString() + " ; Y = " + e.Y.ToString();
isCanPaint = true;
Refresh();
}
private void Form1_Paint(obj ect sender,
System.Windows. Forms.PaintEven tArgs e)
{
if (isCanPaint)
{
Pen myPen = new Pen(Color.Blue, 3);
e.Graphics.Draw Line(myPen,Mous eEvent1.X, MouseEvent1.Y, MouseEvent2.X,
MouseEvent2.Y);
}
}
--
Serge
