【文件属性】：
文件名称：GDI+绘制-boost电路计算模版——mathcad
文件大小：5.1MB
文件格式：PDF
更新时间：2021-06-09 23:59:47
控件，.NET
3.2 GDI+绘制
既然 GDI+在界面绘制上占有重要的地位，那么问题来了，如何才能调用 GDI+绘制对象
呢？常用的方式为重载控件的 OnPaint事件，然后在事件内进行 GDI+绘制，请看下面的代
码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GDIDemo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//绘图无效
Pen drawingPen = new Pen(Color.Black, 3);
this.CreateGraphics().DrawArc(
drawingPen, 36, 19, 100, 100, 40, 180);
drawingPen.Dispose();
}
protected override void OnPaint(PaintEventArgs e)
{
Pen drawingPen = new Pen(Color.Black, 3);
Rectangle rec=new Rectangle(10,10,120,80);
e.Graphics.DrawRectangle(drawingPen, rec);
drawingPen.Dispose();
base.OnPaint(e);
}
private void button1_Click(object sender, EventArgs e)
{
Pen drawingPen = new Pen(Color.Red, 15);
Graphics g = this.CreateGraphics();