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C#利用GDI+繪制旋轉文字等效果，

編輯：C#入門知識

C#利用GDI+繪制旋轉文字等效果，

C#中利用GDI+繪制旋轉文本的文字，網上有很多資料，基本都使用矩陣旋轉的方式實現。但基本都只提及按點旋轉，若要實現在矩形范圍內旋轉文本，資料較少。經過琢磨，可以將矩形內旋轉轉化為按點旋轉，不過需要經過不少的計算過程。利用下面的類可以實現該功能。

[csharp] view plaincopy

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace RotateText
{
public class GraphicsText
{
private Graphics _graphics;
public GraphicsText()
{
}
public Graphics Graphics
{
get { return _graphics; }
set { _graphics = value; }
}
/// <summary>
/// 繪制根據矩形旋轉文本
/// </summary>
/// <param name="s">文本</param>
/// <param name="font">字體</param>
/// <param name="brush">填充</param>
/// <param name="layoutRectangle">局部矩形</param>
/// <param name="format">布局方式</param>
/// <param name="angle">角度</param>
public void DrawString(string s, Font font, Brush brush, RectangleF layoutRectangle, StringFormat format, float angle)
{
// 求取字符串大小
SizeF size = _graphics.MeasureString(s, font);
// 根據旋轉角度，求取旋轉後字符串大小
SizeF sizeRotate = ConvertSize(size, angle);
// 根據旋轉後尺寸、布局矩形、布局方式計算文本旋轉點
PointF rotatePt = GetRotatePoint(sizeRotate, layoutRectangle, format);
// 重設布局方式都為Center
StringFormat newFormat = new StringFormat(format);
newFormat.Alignment = StringAlignment.Center;
newFormat.LineAlignment = StringAlignment.Center;
// 繪制旋轉後文本
DrawString(s, font, brush, rotatePt, newFormat, angle);
}
/// <summary>
/// 繪制根據點旋轉文本，一般旋轉點給定位文本包圍盒中心點
/// </summary>
/// <param name="s">文本</param>
/// <param name="font">字體</param>
/// <param name="brush">填充</param>
/// <param name="point">旋轉點</param>
/// <param name="format">布局方式</param>
/// <param name="angle">角度</param>
public void DrawString(string s, Font font, Brush brush, PointF point, StringFormat format, float angle)
{
// Save the matrix
Matrix mtxSave = _graphics.Transform;
Matrix mtxRotate = _graphics.Transform;
mtxRotate.RotateAt(angle, point);
_graphics.Transform = mtxRotate;
_graphics.DrawString(s, font, brush, point, format);
// Reset the matrix
_graphics.Transform = mtxSave;
}
private SizeF ConvertSize(SizeF size, float angle)
{
Matrix matrix = new Matrix();
matrix.Rotate(angle);
// 旋轉矩形四個頂點
PointF[] pts = new PointF[4];
pts[0].X = -size.Width / 2f;
pts[0].Y = -size.Height / 2f;
pts[1].X = -size.Width / 2f;
pts[1].Y = size.Height / 2f;
pts[2].X = size.Width / 2f;
pts[2].Y = size.Height / 2f;
pts[3].X = size.Width / 2f;
pts[3].Y = -size.Height / 2f;
matrix.TransformPoints(pts);
// 求取四個頂點的包圍盒
float left = float.MaxValue;
float right = float.MinValue;
float top = float.MaxValue;
float bottom = float.MinValue;
foreach(PointF pt in pts)
{
// 求取並集
if(pt.X < left)
left = pt.X;
if(pt.X > right)
right = pt.X;
if(pt.Y < top)
top = pt.Y;
if(pt.Y > bottom)
bottom = pt.Y;
}
SizeF result = new SizeF(right - left, bottom - top);
return result;
}
private PointF GetRotatePoint(SizeF size, RectangleF layoutRectangle, StringFormat format)
{
PointF pt = new PointF();
switch (format.Alignment)
{
case StringAlignment.Near:
pt.X = layoutRectangle.Left + size.Width / 2f;
break;
case StringAlignment.Center:
pt.X = (layoutRectangle.Left + layoutRectangle.Right) / 2f;
break;
case StringAlignment.Far:
pt.X = layoutRectangle.Right - size.Width / 2f;
break;
default:
break;
}
switch (format.LineAlignment)
{
case StringAlignment.Near:
pt.Y = layoutRectangle.Top + size.Height / 2f;
break;
case StringAlignment.Center:
pt.Y = (layoutRectangle.Top + layoutRectangle.Bottom) / 2f;
break;
case StringAlignment.Far:
pt.Y = layoutRectangle.Bottom - size.Height / 2f;
break;
default:
break;
}
return pt;
}
}
}

測試代碼如下：

[csharp] view plaincopy

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
namespace RotateText
{
public partial class FormMain : Form
{
private Font _font = new Font("Arial", 12);
private Brush _brush = new SolidBrush(Color.Black);
private Pen _pen = new Pen(Color.Black, 1f);
private string _text = "Crow Soft";
public FormMain()
{
InitializeComponent();
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
GraphicsText graphicsText = new GraphicsText();
graphicsText.Graphics = e.Graphics;
// 繪制圍繞點旋轉的文本
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
graphicsText.DrawString(_text, _font, _brush, new PointF(100, 80), format, 45f);
graphicsText.DrawString(_text, _font, _brush, new PointF(200, 80), format, -45f);
graphicsText.DrawString(_text, _font, _brush, new PointF(300, 80), format, 90f);
graphicsText.DrawString(_text, _font, _brush, new PointF(400, 80), format, -60f);
// 繪制矩形內旋轉的文本
// First line
RectangleF rc = RectangleF.FromLTRB(50, 150, 200, 230);
RectangleF rect = rc;
format.Alignment = StringAlignment.Near;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 30);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Near;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, -30);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Center;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, -90);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Far;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 70);
// Second line
rect = rc;
rect.Location += new SizeF(0, 100);
format.Alignment = StringAlignment.Center;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 40);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Near;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 30);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Center;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, -70);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Far;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 60);
// Third line
rect = rc;
rect.Location += new SizeF(0, 200);
format.Alignment = StringAlignment.Far;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, -30);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Near;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, -30);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Center;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 90);
rect.Location += new SizeF(180, 0);
format.LineAlignment = StringAlignment.Far;
e.Graphics.DrawRectangle(_pen, rect.Left, rect.Top, rect.Width, rect.Height);
graphicsText.DrawString(_text, _font, _brush, rect, format, 45);
}
}
}

效果如下圖：

資源地址：http://download.csdn.net/detail/alicehyxx/6626473

C:\

可以的

參考這個對C盤進行清理：
1.關閉系統還原:我的電腦屬性/系統還原/關閉所有磁盤上的系統還原,但是以後就不能用系統還原了!
2.關閉系統休眠:控制面板/電源/休眠/在啟動系統休眠前面的勾去掉
3.移動虛擬內存，我的電腦屬性/高級/性能/設置/高級/更改/選C盤也就是系統盤，選無分頁面，然後把虛擬內存設置到其磁盤，要剩余磁盤空間多的磁盤，比如D，E，F等盤．設成內存的1.5~2.5倍,大小可設成一樣!
5.清理IE臨時文件夾，internet選項，刪除臨時文件和脫機文件
6.刪除系統日志和程序日志，我的電腦/控制面板/管理工具/計算機管理/事件查看器/應用程序，鼠標右鍵/清除所事件，在依次清除系統日志
7.清理系統緩存：2000系統是：C:\WINNT\system32\dllcache下的所有文件
XP系統是：C:\windows\system32\dllcache下的所有文件清理系統緩存(打開我的電腦/工具/文件和文件夾選項/隱藏受保護的系統文件的勾去掉在把顯示全部文件勾上)。也可以直接運行sfc.exe /purgecache命令自動刪除。
8.清空回收站
9.刪除c:\windows\SoftwareDistribution\Download下的文件(系統更新時下載的文件如你裝好了更新也就沒有用了)
10.刪除c:\windows\RegisteredPackages下所有目錄
11.刪除C:\WINDOWS\Downloaded Program Files下所有的文件
12.我的電腦文件夾選項查看隱藏已知受系統保護的文件勾去掉,顯示所有文件勾上確定。
13.刪除c:\windows\所有帶$8882305$的文件(系統更新後的備份文件)

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