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 EtchaSketch
{
public partial class Form1 : Form
{
int x = 50, y = 50; // starting position
Bitmap bm;
int x1 = 50, y1 = 50;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
bm = new Bitmap(this.Width, this.Height); // create a form-size bitmap
Graphics g = Graphics.FromImage(bm); // get a graphic object for the bitmap
g.FillEllipse(Brushes.Blue, x, y, 20, 20); // put a circle in the bitmap
this.BackgroundImage = bm; // use the bitmap as the form background
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = Graphics.FromImage(bm); // get a graphic object for the bitmap
g.FillEllipse(Brushes.Blue, x1, y1, 20, 20);
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
string input;
input = keyData.ToString();
if (input == "Down")
{
y1 = y1 + 10;
Refresh();
return true;
}
if (input == "Up")
{
y1 = y1 - 10;
Refresh();
return true;
}
if (input == "Left")
{
x1 = x1 - 10;
Refresh();
return true;
}
if (input == "Right")
{
x1 = x1 + 10;
Refresh();
return true;
}
if (input == "C")
{
g.Clear(BackColor);
Refresh();
return true;
}
return false; // return true if key processed, otherwise false
}
}
}
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