using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace WindowsApplicationTest00
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
B = new Bitmap(panel1.Width, panel1.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
G = Graphics.FromImage(B);
//Como dibujar en el Bitmap de trabajo
G.SmoothingMode = SmoothingMode.HighQuality;
G.Clear(Color.White);
Bs = (Bitmap)(B.Clone());
Gs = Graphics.FromImage(Bs);
//Como dibujar en el Bitmap de almacenamiento (HighSpeed por que sólo guardamos resultados)
Gs.SmoothingMode = SmoothingMode.HighSpeed;
R = new Random();
}
private Bitmap B, Bs = null;
private Graphics G, Gs;
private System.Random R;
private void buttonClear_Click(object sender, EventArgs e)
{
G.Clear(Color.White);
//Indicar al S.O. que el contenido gráfico del panel necesita ser refrescado
panel1.Invalidate();
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
Gs.Dispose();
G.Dispose();
Bs.Dispose();
B.Dispose();
}
private void buttonDraw_Click(object sender, EventArgs e)
{
const int MAX = 20;
for (int i = 0; i <= MAX; i++)
{
G.DrawLine(new Pen(Color.FromArgb(R.Next(256), R.Next(256), R.Next(256))), R.Next(B.Width), R.Next(B.Height), R.Next(B.Width), R.Next(B.Height));
}
panel1.Invalidate();
}
private void buttonSave_Click(object sender, EventArgs e)
{
//Para este caso en particular sería mejor un BitBlt usando la opción
//de copia simple.
// http://msdn2.microsoft.com/en-us/library/ms532278(VS.85).aspx
//Es probable que usando DrawImage junto con Gs.SmoothingMode = SmoothingMode.HighSpeed;
//se obtenga el mismo resultado (copia simple sin efectos ni transformaciones).
Gs.DrawImage(B, 0, 0);
}
private void buttonRestore_Click(object sender, EventArgs e)
{
G.DrawImage(Bs, 0, 0);
panel1.Invalidate();
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.HighSpeed;
e.Graphics.DrawImage(B, 0, 0);
}
}
}