scroll bar with zoom using c#

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  12 years ago

  by phongvanvu

  phong van vu

  , Viet Nam

  Joined 12 years ago

  using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace zoom_aug12 { public partial class Form1 : Form { private Bitmap bmp; Graphics grfbmp; public Form1() { InitializeComponent(); bmp = new Bitmap(1000, 1000); grfbmp = Graphics.FromImage(bmp); Zoom =3F; } float _zoom = 1F; public float Zoom { get { return _zoom; } set { _zoom = value; UPDA(); } } public void UPDA() { this.AutoScrollMinSize = new Size((int)(bmp.Width*Zoom),(int)(bmp.Height*Zoom)); Refresh(); } protected override void OnLoad(EventArgs e) { Rectangle rect = new Rectangle(0, 0, 999, 999); Pen penblue = new Pen(Color.Blue); grfbmp.DrawRectangle(penblue,rect); base.OnLoad(e); } private Rectangle _drawrect = new Rectangle(0, 0, 1000, 1000); public Rectangle DRAWRECT { get { return _drawrect; } set { _drawrect = value; Refresh(); } } private PointF _viewportcenter; PointF ViewPortCenter { get { return _viewportcenter; } set { _viewportcenter = value; } } protected override void OnMouseWheel(MouseEventArgs e) { Zoom += Zoom * (e.Delta / 1200.0f); if (e.Delta > 0) ViewPortCenter = new PointF(ViewPortCenter.X + ((e.X - (Width / 2)) / (2 * Zoom)), ViewPortCenter.Y + ((e.Y - (Height / 2)) / (2 * Zoom))); DRAWRECT = new Rectangle((int)ViewPortCenter.X,(int)(ViewPortCenter.Y),(int)(Width/Zoom),(int)(Height/Zoom)); //base.OnMouseWheel(e); } protected override void OnScroll(ScrollEventArgs se) { DRAWRECT = new Rectangle(0, 0, 1000, 1000); base.OnScroll(se); } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; g.DrawImage(bmp, this.DisplayRectangle, DRAWRECT, GraphicsUnit.Pixel); base.OnPaint(e); } } } This is my code.can any one please help me to fix the scroll bar accurately .using AutoScroll min size using C#
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