c# 전역 비트맵. 다시그리기.

이래하면 되는건가.

에레이.

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.Imaging;

using System.Drawing.Drawing2D;

namespace ImageByBitmap

{

public partial class Form1 : Form

{

Bitmap bmp;

Graphics bmpgraphics;

Point p1 = new Point();

Point p2 = new Point();

public Form1()

{

InitializeComponent();

base.SetStyle(ControlStyles.DoubleBuffer, true);

base.SetStyle(ControlStyles.AllPaintingInWmPaint, true);

base.SetStyle(ControlStyles.ResizeRedraw, true);

bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);

bmpgraphics = Graphics.FromImage(bmp);

bmpgraphics.TranslateTransform(200, 200);

DrawAxis();

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void btClear_Click(object sender, EventArgs e)

{

SolidBrush sBrush = new SolidBrush(pictureBox1.BackColor);

bmpgraphics.FillRectangle(sBrush, -200,-200,400,400);

sBrush.Dispose();

DrawAxis();

}

private void btdraw_Click(object sender, EventArgs e)

{

Pen pen = new Pen(Color.Blue);

p1.X = 100; p1.Y = 0;

p2.X = 100; p2.Y = 100;

bmpgraphics.DrawLine(pen, p1, p2);       // Graphics의 선을 그리는 함수

pen.Dispose();

p1.X = 0; p1.Y = 0;

p2.X = 100; p2.Y = 100;

DrawPoint(p1, p2, Color.Red);

}

private void pictureBox1_Paint(object sender, PaintEventArgs e)

{

Graphics g = e.Graphics;

g.DrawImage(bmp, 0, 0);

pictureBox1.Invalidate();

}

private void DrawAxis() //그냥 그리기.

{

Pen pen = new Pen(Color.Blue);

p1.X = -400; p1.Y = 0;

p2.X = 400; p2.Y = 0;

bmpgraphics.DrawLine(pen, p1, p2);       // Graphics의 선을 그리는 함수

p1.Y = -400; p1.X = 0;

p2.Y = 400; p2.X = 0;

bmpgraphics.DrawLine(pen, p1, p2);       // Graphics의 선을 그리는 함수

p1.X = -200; p1.Y = 2;

p2.X = -200; p2.Y = -2;

for (int i = 0; i <= 40; i++)

{

p1.X += 10;

p2.X += 10;

bmpgraphics.DrawLine(pen, p1, p2);

}

p1.Y = -200; p1.X = 2;

p2.Y = -200; p2.X = -2;

for (int i = 0; i <= 40; i++)

{

p1.Y += 10;

p2.Y += 10;

bmpgraphics.DrawLine(pen, p1, p2);

}

pen.Dispose();

}

private void DrawPoint(Point L1, Point L2, Color color)

{

Pen pen = new Pen(color);

L1.Y = -L1.Y;

L2.Y = -L2.Y;

bmpgraphics.DrawLine(pen, L1, L2);       // Graphics의 선을 그리는 함수

pen.Dispose();

}

}

}