VS2008 "繪制直方圖"窗體的代碼部分
public partial class histForm : Form
{
public histForm(Bitmap bmp)
{
InitializeComponent();
bmpHist = bmp;
countPixel = new int[256];
}
private void close_Click(object sender, EventArgs e)
{
this.Close();
}
private void histForm_Paint(object sender, PaintEventArgs e)
{
Pen curPen = new Pen(Brushes.Black, 1);
Graphics g = e.Graphics;
g.DrawLine(curPen, 50, 240, 320, 240);
g.DrawLine(curPen, 50, 240, 50, 30);
g.DrawLine(curPen, 100, 240, 100, 242);
g.DrawLine(curPen, 150, 240, 150, 242);
g.DrawLine(curPen, 200, 240, 200, 242);
g.DrawLine(curPen, 250, 240, 250, 242);
g.DrawLine(curPen, 300, 240, 300, 242);
g.DrawString("0", new Font("New Timer", 8), Brushes.Black, new PointF(46, 242));
g.DrawString("50", new Font("New Timer", 8), Brushes.Black, new PointF(92, 242));
g.DrawString("100", new Font("New Timer", 8), Brushes.Black, new PointF(139, 242));
g.DrawString("150", new Font("New Timer", 8), Brushes.Black, new PointF(189, 242));
g.DrawString("200", new Font("New Timer", 8), Brushes.Black, new PointF(239, 242));
g.DrawString("250", new Font("New Timer", 8), Brushes.Black, new PointF(289, 242));
g.DrawLine(curPen, 48, 40, 50, 40);
g.DrawString("0", new Font("New Timer", 8), Brushes.Black, new PointF(34, 234));
g.DrawString(maxPixel.ToString(), new Font("New Timer", 8), Brushes.Black, new PointF(18, 34));
double temp = 0;
for (int i = 0; i < 256; i++)
{
temp = 200.0 * countPixel[i] / maxPixel;
g.DrawLine(curPen, 50 + i, 240, 50 + i, 240 - (int)temp);
}
curPen.Dispose();
}
private void histForm_Load(object sender, EventArgs e)
{
Rectangle rect = new Rectangle(0, 0, bmpHist.Width, bmpHist.Height);
System.Drawing.Imaging.BitmapData bmpData = bmpHist.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bmpHist.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = bmpHist.Width * bmpHist.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
byte temp = 0;
maxPixel = 0;
Array.Clear(countPixel, 0, 256);
for (int i = 0; i < bytes; i++)
{
temp = grayValues[i];
countPixel[temp]++;
if (countPixel[temp] > maxPixel)
{
maxPixel = countPixel[temp];
}
}
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
bmpHist.UnlockBits(bmpData);
}
}
窗體設計類部分。
partial class histForm
{
/// <summary>
/// 必需的設計器變量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的資源。
/// </summary>
/// <param name="disposing">如果應釋放托管資源，為 true；否則為 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗體設計器生成的代碼
/// <summary>
/// 設計器支持所需的方法 - 不要
/// 使用代碼編輯器修改此方法的內容。
/// </summary>
private void InitializeComponent()
{
this.close = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// close
//
this.close.Location = new System.Drawing.Point(252, 265);
this.close.Name = "close";
this.close.Size = new System.Drawing.Size(75, 23);
this.close.TabIndex = 0;
this.close.Text = "關閉";
this.close.UseVisualStyleBackColor = true;
this.close.Click += new System.EventHandler(this.close_Click);
//
// histForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(347, 305);
this.ControlBox = false;
this.Controls.Add(this.close);
this.Name = "histForm";
this.Text = "直方圖";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.histForm_Paint);
this.Load += new System.EventHandler(this.histForm_Load);
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Button close;
private System.Drawing.Bitmap bmpHist;
private int[] countPixel;
private int maxPixel;
}