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The author:(作者)qqpublished in(发表于) 2014/7/11 9:16:39 c#中GDI+图形图像:GDI+中的多边形使用方法
c#中GDI+图形图像:GDI+中的多边形使用方法|实例
GDI+中的多边形绘制多边形,需要Graphics对象、Pen对象和Point(或PointF)对象数组。Graphics对象提供DrawPolygon方法,Pen对象存储用于呈现多边形的线条属性,例如,宽度和颜色等,Point(或PointF)对象数组存储多边形的各个顶点。Pen对象和Point(或PointF)对象数组作为参数传递给DrawPolygon方法,该方法为可重载方法,其常用格式有以下两种。(1)绘制由一组Point结构定义的多边形。语法:public void DrawPolygon (Pen pen,Point[] points)参数说明如下。pen:Pen对象,它确定多边形的颜色、宽度和样式。points:Point结构数组,这些结构表示多边形的顶点。(2)绘制由一组PointF结构定义的多边形。语法:public void DrawPolygon (Pen pen,PointF[] points)参数说明如下。pen:Pen对象,它确定多边形的颜色、宽度和样式。points:PointF结构数组,这些结构表示多边形的顶点。示例绘制多边形本示例实现的是,当程序运行时,单击【绘制多边形】按钮,在窗体中绘制一个多边形。示例运行结果如图1所示网站源代码。图1 绘制多边形程序代码如下。Form1窗体中,在【绘制多边形】按钮的Click事件中分别声明Graphics类和Pen类的两个对象,然后实例化6个Point对象,用来作为多边形的顶点,声明一个Point结构数组,并将已经实例化的6个Point对象赋值给该数组,最后调用Graphics对象的DrawPolygon方法绘制一个多边形。【绘制多边形】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.Red, 3);Point point1 = new Point(80, 20);Point point2 = new Point(40, 50);Point point3 = new Point(80, 80);Point point4 = new Point(160, 80);Point point5 = new Point(200, 50);Point point6 = new Point(160, 20);Point[] myPoints ={ point1, point2, point3, point4, point5, point6 };graphics.DrawPolygon(myPen, myPoints);}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_05{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.Red, 3);Point point1 = new Point(80, 20);Point point2 = new Point(40, 50);Point point3 = new Point(80, 80);Point point4 = new Point(160, 80);Point point5 = new Point(200, 50);Point point6 = new Point(160, 20);Point[] myPoints ={ point1, point2, point3, point4, point5, point6 };graphics.DrawPolygon(myPen, myPoints);}}}★ ★★★★Form1.Designer.cs窗体设计文件完整程序代码网站源代码★★★★★namespace _6_05{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(77, 93);this.button1.Name = "button1";this.button1.Size = new System.Drawing.Size(75, 23);this.button1.TabIndex = 0;this.button1.Text = "绘制多边形";this.button1.UseVisualStyleBackColor = true;this.button1.Click += new System.EventHandler(this.button1_Click);
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