using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Drawing.Drawing2D; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WinformImg { public partial class RulerForm : Form { int zoom = 2;//缩放比例 int _pxwidth = 0;//每毫米包含多少个像素，这是一个粗略的估算值，用于在不同的分辨率下，画布的大小基本一致 public int Pxwidth { get { return _pxwidth * zoom; } set { _pxwidth = value; } } int _canvasWidth = 210;//画布的宽度 public int CanvasWidth { get { return _canvasWidth; } set { _canvasWidth = value; } } int _canvasHeight = 148;//画布的高度 public int CanvasHeight { get { return _canvasHeight; } set { _canvasHeight = value; } } Panel canvas = new Panel();//画布 TextBox lineX = new TextBox();//横坐标游标 TextBox lineY = new TextBox();//纵坐标游标 public RulerForm() { InitializeComponent(); this.CanvasHeight = 148;//设置画布的高度 this.CanvasWidth = 210;//设置画布的宽度 Calcsale();//计算每毫米的像素数量 } /// <summary> /// 加载画布和游标卡尺 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void RulerForm_Load(object sender, EventArgs e) { canvas.Width = this.CanvasWidth * this.Pxwidth;//将毫米宽度转换为像素宽度 canvas.Height = this.CanvasHeight * this.Pxwidth;//将毫米高度转换为像素高度 canvas.Top = 20; canvas.Left = 20; canvas.BackColor = Color.White; canvas.Paint += Canvas_Paint; canvas.MouseMove += Canvas_MouseMove; this.Controls.Add(canvas); //标尺 lineX.Width = 1; lineX.Height = 14; lineX.Top = 6; lineX.BackColor = Color.Red; lineX.Multiline = true; lineX.Visible = false; this.Controls.Add(lineX); //标尺 lineY.Width = 14; lineY.Height = 1; lineY.Left = 6; lineY.BackColor = Color.Red; lineY.Multiline = true; lineY.Visible = false; this.Controls.Add(lineY); this.Width = canvas.Width + 40; this.Height = canvas.Height + 40; } /// <summary> /// 画作标尺 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void RulerForm_Paint(object sender, PaintEventArgs e) { var grap = e.Graphics; //画布区域 Rectangle rect = new Rectangle(20, 20, this.CanvasWidth * this.Pxwidth, this.CanvasHeight * this.Pxwidth); grap.DrawRectangle(new Pen(Color.Black, 1), rect); SetXRuler(ref grap);//画横坐标 SetYRuler(ref grap);//画纵坐标 } /// <summary> /// 画网格线 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void Canvas_Paint(object sender, PaintEventArgs e) { Graphics grap = e.Graphics; //画布区域 Rectangle rect = new Rectangle(0, 0, this.CanvasWidth * this.Pxwidth, this.CanvasHeight * this.Pxwidth); grap.DrawRectangle(new Pen(Color.Black, 1), rect); //画网格,每5mm一个点 Pen pen = new Pen(Color.Gray, 1); pen.DashStyle = DashStyle.Dot; pen.DashPattern = new float[] { 1, 5 * this.Pxwidth - 1 };//点长度1px，点间空白4mm for (var i = 0; i < this.CanvasWidth; i = i + 5) { grap.DrawLine(pen, i * this.Pxwidth, 0, i * this.Pxwidth, this.CanvasHeight * this.Pxwidth); } } /// <summary> /// 鼠标移动事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void Canvas_MouseMove(object sender, MouseEventArgs e) { lineX.Visible = true; lineY.Visible = true; lineX.Location = new Point(20 + e.X, 6); lineY.Location = new Point(6, 20 + e.Y); } #region 私有方法 [DllImport("gdi32.dll")] public static extern int GetDeviceCaps(IntPtr hdc, int Index); /// <summary> /// 计算精度 确保在不同分辨率的机子上刻度的准确性 /// </summary> private void Calcsale() { PictureBox p = new PictureBox(); Graphics g = Graphics.FromHwnd(p.Handle); IntPtr hdc = g.GetHdc(); //GetDeviceCaps(hdc, 4)方法中，第二个参数意义：4毫米为单位屏幕宽度，6毫米为单位屏幕高度，8像素为单位的屏幕宽度10像素为单位的屏幕高度 int width = GetDeviceCaps(hdc, 4); int pix = GetDeviceCaps(hdc, 8); this.Pxwidth = pix / width; } /// <summary> /// 画横坐标 /// </summary> /// <param name="grap"></param> private void SetXRuler(ref Graphics grap) { Pen pen = new Pen(Color.Black, 1); int count = 0; //一个单位画一格 for (int i = 0; i <= this.CanvasWidth; i++) { if (count % 10 == 0) { grap.DrawLine(pen, 20 + i * this.Pxwidth, 5, 20 + i * this.Pxwidth, 20); grap.DrawString(count.ToString(), new Font("宋体", 8), new SolidBrush(Color.Black), 20 + i * this.Pxwidth + 2, 2, new StringFormat()); } else if (count % 5 == 0) { grap.DrawLine(pen, 20 + i * this.Pxwidth, 12, 20 + i * this.Pxwidth, 20); } else { grap.DrawLine(pen, 20 + i * this.Pxwidth, 15, 20 + i * this.Pxwidth, 20); } count++; } } /// <summary> /// 画纵坐标 /// </summary> /// <param name="grap"></param> private void SetYRuler(ref Graphics grap) { Pen pen = new Pen(Color.Black, 1); int count = 0; //设置刻度上面显示数字垂直显示 StringFormat stringFormat = new StringFormat(); stringFormat.FormatFlags = StringFormatFlags.DirectionVertical; //一个单位画一格 for (int i = 0; i <= this.CanvasHeight; i++) { if (count % 10 == 0) { grap.DrawLine(pen, 5, 20 + i * this.Pxwidth, 20, 20 + i * this.Pxwidth); grap.DrawString(count.ToString(), new Font("宋体", 8), new SolidBrush(Color.Black), 2, 20 + i * this.Pxwidth + 2, stringFormat); } else if (count % 5 == 0) { grap.DrawLine(pen, 12, 20 + i * this.Pxwidth, 20, 20 + i * this.Pxwidth); } else { grap.DrawLine(pen, 15, 20 + i * this.Pxwidth, 20, 20 + i * this.Pxwidth); } count++; } } #endregion } }
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