cscの作法 その272

概要

cscの作法、調べてみた。
.NETFramework2.0 に書き直してみた。

写真

参考にしたページ

サンプルコード

using System;
using System.Drawing;
using System.Windows.Forms;

namespace App
{
	public partial class form1 : Form {
		Bitmap Bm;
		bool mouseDrug;
		int prevX;
		int prevY;
		PictureBox DrawingPicBox;
		public form1() {
			DrawingPicBox = new PictureBox();
			DrawingPicBox.Size = new Size(300, 300);
			DrawingPicBox.MouseDown += new MouseEventHandler(DrawingPicBox_MouseDown);
			DrawingPicBox.MouseUp += new MouseEventHandler(DrawingPicBox_MouseUp);
			DrawingPicBox.MouseMove += new MouseEventHandler(DrawingPicBox_MouseMove);
			this.Controls.Add(DrawingPicBox);
			Bm = new Bitmap(DrawingPicBox.Width, DrawingPicBox.Height);
		}
		private void DrawingPicBox_MouseDown(object sender, MouseEventArgs e) {
			mouseDrug = true;
			prevX = e.Location.X;
			prevY = e.Location.Y;
		}
		private void DrawingPicBox_MouseUp(object sender, MouseEventArgs e) {
			mouseDrug = false;
		}
		private void DrawingPicBox_MouseMove(object sender, MouseEventArgs e) {
			if (mouseDrug == true)
			{
				Graphics objGrp = Graphics.FromImage(Bm);
				Pen objPen = new Pen(Color.Blue, 3);
				objGrp.DrawLine(objPen, prevX, prevY, e.Location.X, e.Location.Y);
				prevX = e.Location.X;
				prevY = e.Location.Y;
				objPen.Dispose();
				objGrp.Dispose();
				DrawingPicBox.Image = Bm;
			}
		}
		[STAThread]
		static void Main() {
			Application.EnableVisualStyles();
			Application.Run(new form1());
		}
	}
}

以上。