这段时间忙于研究WinForm的标尺与网格,主管要我做的跟PowerDesigner一样，经过一段时间的研究、实践、修改，最终达标了，代码如下。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.Drawing.Drawing2D;
//计算屏幕像素大小和mm大小引用
using System.Runtime.InteropServices;
namespace UntilityControl
{
public partial class RuleAndGrid : UserControl
{
public Control useControl;
private TextBox lineX=new TextBox();
private TextBox lineY=new TextBox();
private TextBox rectangleX=new TextBox();
private TextBox rectangleY=new TextBox();
Pen penG = new Pen(Color.Black);
Pen penL = new Pen(Color.Red);
Font font = new Font("宋体", 8);
public RuleAndGrid()
{
InitializeComponent();
}
public Panel panel1 = new Panel();
//每毫米占的像素数
float pxwidth;
private void RulerAndGrid_Paint(object sender, PaintEventArgs e)
{
Graphics PenGraphics = e.Graphics;
InitializeGraph(PenGraphics);
}
private void RulerAndGrid_Load(object sender, EventArgs e)
{
panel1.Left = 21;
panel1.Top = 21;
panel1.Width = RulerWidth - 42;
panel1.Height = RulerHeight - 42;
panel1.BackColor = Color.White;
panel1.MouseMove += new MouseEventHandler(panel1_MouseMove);
panel1.MouseUp+=new MouseEventHandler(panel1_MouseUp);
panel1.Paint+=new PaintEventHandler(panel1_Paint);
lineX.Width = 1;
lineX.Height = 14;
lineX.Top = 6;
lineX.BackColor = Color.Red;
lineX.Multiline = true;
lineX.Visible = false;
this.Controls.Add(lineX);
lineY.Width = 14;
lineY.Height = 1;
lineY.Left = 6;
lineY.BackColor = Color.Red;
lineY.Multiline = true;
lineY.Visible = false;
this.Controls.Add(lineY);
rectangleX.Height = 6;
rectangleX.Top =14;
rectangleX.BackColor = Color.Black;
rectangleX.Multiline = true;
rectangleX.Visible = false;
this.Controls.Add(rectangleX);
rectangleY.Width = 6;
rectangleY.Left = 14;
rectangleY.BackColor = Color.Black;
rectangleY.Multiline = true;
rectangleY.Visible = false;
this.Controls.Add(rectangleY);
this.Controls.Add(panel1);
Calcsale();
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
DrawGrid();
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
SetProperty sp = new SetProperty();
sp.rad = this;
sp.ShowDialog();
}
else
{
if (useControl != null)
{
useControl.MouseClick +=new MouseEventHandler(useControl_MouseClick);
useControl.Top = e.Y;
useControl.Left = e.X;
panel1.Controls.Add(useControl);
panel1.Cursor = Cursors.Default;
rectangleX.Left = e.X+21;
rectangleX.Width = useControl.Width;
rectangleX.Visible = true;
rectangleY.Top = e.Y+21;
rectangleY.Height = useControl.Height;
rectangleY.Visible = true;
useControl = null;
}
}
}
private void useControl_MouseClick(object sender, MouseEventArgs e)
{
}
private void ChangePanelSize()
{
panel1.Width = RulerWidth - 42;
panel1.Height = RulerHeight - 42;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (useControl != null)
{
panel1.Cursor = Cursors.Cross;
}
else
{
panel1.Cursor = Cursors.Default;
}
lineX.Left = e.X+21;
lineX.Visible = true;
lineY.Top = e.Y+21;
lineY.Visible = true;
}
[Browsable(true),Category("直尺尺寸"),Description("直尺长")]
public int RulerWidth
{
get
{
return this.Width;
}
set
{
this.Width = value;
this.Refresh();
ChangePanelSize();
}
}
[Browsable(true), Category("直尺尺寸"), Description("直尺宽")]
public int RulerHeight
{
get
{
return this.Height;
}
set
{
this.Height = value;
this.Refresh();
ChangePanelSize();
}
}
//定义一个显示刻度的单位的属性，单位是毫米或英寸
public enum scaletype
{
centimeter = 0, inch = 1
}
scaletype usescale = scaletype.centimeter;
[Browsable(true), Category("用户属性"), Description("设置显示单位，厘米或英寸")]
public scaletype Unit
{
get
{
return usescale;
}
set
{
usescale = value;
this.Refresh();
}
}
//定义网格显示多少刻度的值
public enum GridUnitValue
{
One = 1, Two = 2, Three = 3, Four = 4, Five = 5
}
GridUnitValue useGirdUnit = GridUnitValue.Five;
[Browsable(true), Category("用户属性"), Description("设置每格网格所占的刻度数")]
public GridUnitValue GridUnit
{
get
{
return useGirdUnit;
}
set
{
useGirdUnit = value;
this.Refresh();
}
}
//定义一个按比例放大/缩小刻度的属性，该属性是缩放的系数
float c = 1.0f;
[Browsable(true), Category("用户属性"), Description("设置显示比例")]
public float Coefficient
{
get
{
return c;
}
set
{
c = value;
this.Refresh();
}
}
[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);
pxwidth = pix / width;
}
//定义一个设置横轴起始刻度值的属性
private double checkPaperWidth = 0;
[Browsable(true), Category("用户属性"), Description("设置刻度尺横轴刻度的起始值")]
public double StartX
{
get
{
return checkPaperWidth;
}
set
{
checkPaperWidth = value;
this.Refresh();
}
}
//定义一个设置纵轴起始刻度值的属性
private double checkPaperHeight = 0;
[Browsable(true), Category("用户属性"), Description("设置刻度尺纵轴刻度的起始值")]
public double StartY
{
get
{
return checkPaperHeight;
}
set
{
checkPaperHeight = value;
this.Refresh();
}
}
//定义一个当控件内部图形发生变化的时候触发的事件
public delegate void PaperChangeHandle();
private PaperChangeHandle PaperChanged;
[Browsable(true), Category("用户事件"), Description("当控件内部图形发生变化的时候触发")]
public event PaperChangeHandle OnPaperChanged
{
add
{
PaperChanged += value;
}
remove
{
PaperChanged -= value;
}
}
private void InitializeGraph(Graphics Gph)
{
//// 画竖线
//Gph.DrawLine(penG, 20, 20, 20, height - 20);
//Gph.DrawLine(penG, height - 20, 20, height - 20, height - 20);
//// 画横线
//Gph.DrawLine(penG, 20, 20, width - 20, 20);
//Gph.DrawLine(penG, 20, width - 20, width - 20, height - 20);
Rectangle curRect = new Rectangle(20, 20, RulerWidth - 40, RulerHeight - 40);
Gph.DrawRectangle(penG, curRect);
SetXAxis(ref Gph);
SetYAxis(ref Gph);
}
///<summary>
/// 设置画图板横轴的刻度。
///</summary>
///<param name="objGraphics"></param>
private void SetXAxis(ref Graphics objGraphics)
{
int x1 = 20;
int y1 = 5;
int x2 = 20;
int y2 = 20;
//刻度步长
float scale = 0;
float Scale = scale;
// 判断当前的刻度数目标记
int iCount = 0;
double X = checkPaperWidth;
// 设置横轴的刻度
for (int i = 0; Scale <= RulerWidth - 40; i++)
{
if (iCount == 10)
{
// 画出长刻度 长 15象素
objGraphics.DrawLine(penG, (x1 + Scale), y1, (x2 + Scale), y2);
objGraphics.DrawLine(penG, (x1 + Scale), RulerHeight - 5, (x2 + Scale), RulerHeight - 20);
iCount = 0;
// 标出刻度上的数字
X += 10;
objGraphics.DrawString(X.ToString(), font, new SolidBrush(Color.Black), (x1 + Scale - 15), 0);
objGraphics.DrawString(X.ToString(), font, new SolidBrush(Color.Black), (x1 + Scale - 15), RulerHeight - 10);
}
else if (iCount == 5)
{
// 画中间刻度 长 9象素
objGraphics.DrawLine(penG, (x1 + Scale), y1 + 6, (x2 + Scale), y2);
objGraphics.DrawLine(penG, (x1 + Scale), RulerHeight - 11, (x2 + Scale), RulerHeight - 20);
}
else
{
// 画短刻度 长 6象素
objGraphics.DrawLine(penG, (x1 + Scale), (y1 + 9), (x2 + Scale), y2);
objGraphics.DrawLine(penG, (x1 + Scale), RulerHeight - 14, (x2 + Scale), RulerHeight - 20);
}
iCount++;
if (usescale == scaletype.centimeter)
{
scale += pxwidth;
Scale = scale * c;
}
else
{
scale += 2.54f * pxwidth;
Scale = scale * c;
}
}
}
/// <summary>
/// 设置画图板纵轴的刻度。
/// </summary>
/// <param name="objGraphics"></param>
private void SetYAxis(ref Graphics objGraphics)
{
int x1 = 5;
int y1 = 20;
int x2 = 20;
int y2 = 20;
int iCount = 0;
float scale = 0;
float Scale = scale;
double Y = checkPaperHeight;
//设置刻度上面显示数字垂直显示
StringFormat stringFormat = new StringFormat();
stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;
for (int i = 0; Scale <= RulerHeight - 40; i++)
{
if (iCount == 10)
{
// 画出长刻度 长 15象素
objGraphics.DrawLine(penG, x1, (y1 + Scale), x2, (y2 + Scale));
objGraphics.DrawLine(penG, RulerWidth - 20, (y1 + Scale), RulerWidth - 5, (y2 + Scale));
iCount = 0;
// 标出刻度上的数字
Y += 10;
objGraphics.DrawString(Y.ToString(), font, new SolidBrush(Color.Black), 0, Scale + 8, stringFormat);
objGraphics.DrawString(Y.ToString(), font, new SolidBrush(Color.Black), RulerWidth - 14, Scale + 8, stringFormat);
}
else if (iCount == 5)
{
// 画出短刻度 长 9象素
objGraphics.DrawLine(penG, (x1 + 6), (y1 + Scale), x2, (y2 + Scale));
objGraphics.DrawLine(penG, RulerWidth - 20, (y1 + Scale), RulerWidth - 11, (y2 + Scale));
}
else
{
// 画出短刻度 长 6象素
objGraphics.DrawLine(penG, (x1 + 9), (y1 + Scale), x2, (y2 + Scale));
objGraphics.DrawLine(penG, RulerWidth - 20, (y1 + Scale), RulerWidth - 14, (y2 + Scale));
}
iCount++;
if (usescale == scaletype.centimeter)
{
scale += pxwidth;
Scale = scale * c;
}
else
{
scale += 2.54f * pxwidth;
Scale = scale * c;
}
}
}
private void DrawGrid()
{
Pen p = new Pen(Color.Gray, 1);
p.DashStyle = DashStyle.Dot;
p.DashPattern = new float[] { 1, pxwidth * Convert.ToInt32(GridUnit) - 1 };
Graphics gg = panel1.CreateGraphics();
for (int i = 0; i < (RulerWidth - 40) / pxwidth; i++)
{
gg.DrawLine(p, -1, (pxwidth * i * (float)(Convert.ToInt32(GridUnit))-1), (panel1.Width), (pxwidth * i * (float)(Convert.ToInt32(GridUnit))-1));
}
}
}
}
