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The author:(作者)qqpublished in(发表于) 2014/7/11 9:16:43 c#中GDI+图形图像:GDI+中的椭圆和弧使用方法
c#中GDI+图形图像:GDI+中的椭圆和弧使用方法|实例
GDI+中的椭圆和弧1.绘制椭圆绘制椭圆时,可以调用Graphics类中的DrawEllipse方法,该方法为可重载方法,它主要用来绘制边界由Rectangle结构指定的椭圆,其常用格式有以下两种。(1)绘制边界由Rectangle结构指定的椭圆。语法:public void DrawEllipse (Pen pen,Rectangle rect)参数说明如下。pen:Pen对象,它确定曲线的颜色、宽度和样式。rect:Rectangle结构,它定义椭圆的边界。(2)绘制一个由边框(该边框由一对坐标、高度和宽度指定)指定的椭圆。语法:public void DrawEllipse (Pen pen,int x,int y,int width,int height)DrawEllipse方法中各参数及说明如表1所示。表1 DrawEllipse方法参数及说明示例绘制椭圆本示例实现的是,当程序运行时,单击【绘制椭圆】按钮,在窗体中的指定位置绘制一个指定边框大小的椭圆。示例运行结果如图1所示。图1 绘制椭圆程序代码如下。Form1窗体中,在【绘制椭圆】按钮的Click事件中分别声明Graphics类和Pen类的两个实例对象,然后定义一个Rectangle结构,以用来控制椭圆的边框大小,最后调用Graphics对象的DrawEllipse方法在窗体中绘制一个指定边框大小的椭圆。网站源代码【绘制椭圆】按钮的Click事件代码如下:private void button1_Click(object sender, EventArgs e){Graphics graphics = this.CreateGraphics();Pen myPen = new Pen(Color.Blue, 3);Rectangle myRectangle = new Rectangle(70, 20, 100, 60);graphics.DrawEllipse(myPen, myRectangle);}完整程序代码如下:★ ★★★★Form1.cs窗体代码文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace _6_03{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Graphics graphics = this.CreateGraphics();Pen myPen = new Pen(Color.Blue, 3);Rectangle myRectangle = new Rectangle(70, 20, 100, 60);graphics.DrawEllipse(myPen, myRectangle);}}}★ ★★★★Form1.Designer.cs窗体代码文件完整程序代码★★★★★namespace _6_03{partial class Form1{/// 本教程来自:HTTP://www.isstudy.com/// 必需的设计器变量。/// private System.ComponentModel.IContainer components = null;/// /// 清理所有正在使用的资源。/// /// 如果应释放托管资源,为 true;否则为 false。protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);}#region Windows 窗体设计器生成的代码/// /// 设计器支持所需的方法 - 不要/// 使用代码编辑器修改此方法的内容。/// private void InitializeComponent(){this.button1 = new System.Windows.Forms.Button();this.SuspendLayout();//// button1//this.button1.Location = new System.Drawing.Point(78, 90);this.button1.Name = "button1";this.button1.Size = new System.Drawing.Size(75, 23);this.button1.TabIndex = 0;this.button1.Text = "绘制椭圆";this.button1.UseVisualStyleBackColor = true;this.button1.Click += new System.EventHandler(this.button1_Click);//// Form1//本教程来自:HTTP://www.isstudy.comthis.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.ClientSize = new System.Drawing.Size(231, 135);this.Controls.Add(this.button1);this.MaximizeBox = false;this.Name = "Form1";this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;this.Text = "Form1";this.ResumeLayout(false);
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