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The author:(作者)qqpublished in(发表于) 2014/7/11 9:16:48 c#中GDI+图形图像:GDI+中的直线和矩形使用方法
c#中GDI+图形图像:GDI+中的直线和矩形使用方法
GDI+中的直线和矩形1.绘制直线绘制直线时,可以调用Graphics类中的DrawLine方法,该方法为可重载方法,它主要用来绘制一条连接由坐标对指定的两个点的线条,其常用格式有以下两种。(1)绘制一条连接两个Point结构的线。语法:public void DrawLine (Pen pen,Point pt1,Point pt2)参数说明如下。pen:Pen对象,它确定线条的颜色、宽度和样式。pt1:Point结构,它表示要连接的第一个点。pt2:Point结构,它表示要连接的第二个点。(2)绘制一条连接由坐标对指定的两个点的线条。语法:public void DrawLine (Pen pen,int x1,int y1,int x2,int y2)DrawLine方法中各参数及说明如表1所示。表1 DrawLine方法参数及说明示例绘制直线本示例实现的是,当程序运行时,单击【绘制直线】按钮,在窗体中的指定位置绘制一条直线。示例运行结果如图1所示。图1 绘制直线程序代码如下。Form1窗体中,在【绘制直线】按钮的Click事件中分别声明Graphics类和Pen类的两个实例对象,然后调用Graphics对象的DrawLine方法在窗体中绘制一条直线。【绘制直线】按钮的Click事件代码如下网站源代码:private void button1_Click(object sender, EventArgs e){//本教程来自:HTTP://www.isstudy.comGraphics graphics = this.CreateGraphics();Pen myPen = new Pen(Color.Blue, 2);graphics.DrawLine(myPen, 50, 30, 170, 30);}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_01{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, 2);graphics.DrawLine(myPen, 50, 30, 170, 30);}}}★ ★★★★Form1.Designer.cs窗体设计文件完整程序代码★★★★★namespace _6_01{partial class Form1{/// /// 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();//本教程来自:HTTP://www.isstudy.com// button1//this.button1.Location = new System.Drawing.Point(63, 61);this.button1.Name = "button1";this.button1.Size = new System.Drawing.Size(75, 23);this.button1.TabIndex = 0;this.button1.Text = "绘制直线";this.button1.UseVisualStyleBackColor = true;this.button1.Click += new System.EventHandler(this.button1_Click);//// Form1//this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.ClientSize = new System.Drawing.Size(212, 106);this.Controls.Add(this.button1);this.MaximizeBox = false;this.Name = "Form1";this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;this.Text = "Form1";this.ResumeLayout(false);}#endregionprivate System.Windows.Forms.Button button1;}}★ ★★★★Program.cs主程序文件完整程序代码网站源代码★★★★★using System;
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