C# 把图片显示成椭圆形状 例子源码下载

实例如图所示

 
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace ShowImageByEllipse{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private Bitmap SourceBitmap; private Bitmap MyBitmap; private void button2_Click(object sender, EventArgs e) { //打开图像文件 OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Filter = "图像文件(JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png| JPeg 图像文件(*.jpg;*.jpeg)|*.jpg;*.jpeg |GIF 图像文件(*.gif)|*.gif |BMP图像文件(*.bmp)|*.bmp|Tiff图像文件(*.tif;*.tiff)|*.tif;*.tiff|Png图像文件(*.png)| *.png |所有文件(*.*)|*.*"; if (openFileDialog.ShowDialog() == DialogResult.OK) { //得到原始大小的图像 SourceBitmap = new Bitmap(openFileDialog.FileName); //得到缩放后的图像 MyBitmap = new Bitmap(SourceBitmap, this.pictureBox1.Width, this.pictureBox1.Height); this.pictureBox1.Image = MyBitmap; } } private void button1_Click(object sender, EventArgs e) { this.panel1.Refresh();//刷新Panel控件 Graphics g = this.panel1.CreateGraphics();//实例化绘图对象 TextureBrush MyBrush = new TextureBrush(MyBitmap);//实例化TextureBrush对象 g.FillEllipse(MyBrush, this.panel1.ClientRectangle);//绘制椭圆图像 } }}