微软.net精简框架常见问题及回答(中文版)(9)

protected override void OnPaint(PaintEventArgs e)

{

string s = "Hello World"

Pen pen = new Pen(Color.Fuchsia);

Font font = new Font("Arial", 18, FontStyle.Regular);

Brush brush = new SolidBrush(Color.Black);

SizeF sSize = e.Graphics.MeasureString(s, font);

Rectangle r = new Rectangle(9, 199,(int)sSize.Width + 1, (int)sSize.Height + 1);

e.Graphics.DrawRectangle(pen, r);

e.Graphics.DrawString(s, font, brush, 10.0f, 200.0f);

base.OnPaint (e);

}

'VB

Imports System.Drawing

Protected Overrides Sub OnPaint(e As PaintEventArgs)

Dim s As String = "Hello World"

Dim pen As New Pen(Color.Fuchsia)

Dim font As New Font("Arial", 18, FontStyle.Regular)

Dim brush = New SolidBrush(Color.Black)

Dim sSize As SizeF = e.Graphics.MeasureString(s, font)

Dim r As New Rectangle(9, 199, Fix(sSize.Width) + 1, Fix(sSize.Height) + 1)

e.Graphics.DrawRectangle(pen, r)

e.Graphics.DrawString(s, font, brush, 10F, 200F)

MyBase.OnPaint(e)

End Sub 'OnPaint

2.7. Can I set the width of a pen?

Setting the pen width is not available in the .NET Compact Framework. Some alternate solutions include:

Drawing filled rectangles with the Graphics.FillRectangle method

Drawing multiple lines next to each other

Writing a custom graphics routine with GAPI 2.8. How do I zoom an image?

While there is no inherent support for zooming or stretching a single image, these effects can be achieved quite easily by creating a new Bitmap object with an associated Graphics object and copying the desired portion of the original Bitmap into it. The following sample creates two bitmaps of the same size, where the second contains a zoomed center section of the first, provided the project has an embedded resource named MyImage.bmp. This same technique could be used to stretch images by modifying the source and destination rectangles such that they do not maintain their original aspect ratio. //C#

using System.Drawing;

using System.Reflection;

Bitmap m_bmpOriginal;

Bitmap m_bmpZoom;

private void Form1_Load(object sender, System.EventArgs e)

{

Assembly asm = Assembly.GetExecutingAssembly();

m_bmpOriginal = new Bitmap(asm.GetManifestResourceStream(asm.GetName().Name

+ ".MyImage.bmp"));

// Take the center quarter of m_bmpOriginal

// and create stetch it into m_bmpZoom of the same size

m_bmpZoom = new Bitmap(m_bmpOriginal.Width, m_bmpOriginal.Height);

Graphics gZoom = Graphics.FromImage(m_bmpZoom);

Rectangle srcRect = new Rectangle(m_bmpOriginal.Width / 4, m_bmpOriginal.Height / 4,

m_bmpOriginal.Width / 2, m_bmpOriginal.Height / 2);

Rectangle dstRect = new Rectangle(0, 0, m_bmpZoom.Width, m_bmpZoom.Height);

gZoom.DrawImage(m_bmpOriginal, dstRect, srcRect, GraphicsUnit.Pixel);

}

protected override void OnPaint(PaintEventArgs e)

{

e.Graphics.DrawImage(m_bmpOriginal, 0, 0);

e.Graphics.DrawImage(m_bmpZoom, 125, 0);

base.OnPaint (e);

}

'VB

Imports System.Drawing

Imports System.Reflection

Private m_bmpOriginal As Bitmap

Private m_bmpZoom As Bitmap

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim asm As [Assembly] = [Assembly].GetExecutingAssembly()

m_bmpOriginal = New Bitmap(asm.GetManifestResourceStream((asm.GetName().Name _

+ ".MyImage.bmp")))