c#如何绘制树_C_内存溢出

概述如图所示，点击Form控件，自动生成一棵树相关代码如下：using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;namespace WindowsFormsApp7{ public pa...

如图所示，点击Form控件，自动生成一棵树

相关代码如下：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.windows.Forms;
using System.Data;

namespace windowsFormsApp7
{
public partial class Form1 : Form
{
public Form1()
{
this.autoScaleBaseSize = new Size(6,14);
this.ClIEntSize = new Size(400,400);
this.Paint += new PaintEventHandler(this.Form1_Load);
this.Click += new EventHandler(this.Redraw);
}

private voID Form1_Load(object sender,PaintEventArgs e)
{
graphics = e.Graphics;
drawTree(10,200,380,100,-PI / 2);
}

private voID Redraw(object sender,EventArgs e)
{
this.InvalIDate();
}

private Graphics graphics;
const double PI = Math.PI;
double th1 = 35 * Math.PI / 180;
double th2 = 25 * Math.PI / 180;
double per1 = 0.6;
double per2 = 0.7;

Random rnd = new Random();
double rand()
{
return rnd.NextDouble();
}

voID drawTree(int n,
double x0,double y0,double leng,double th)
{
if (n == 0) return;

double x1 = x0 + leng * Math.Cos(th);
double y1 = y0 + leng * Math.Sin(th);
drawline(x0,y0,x1,y1);
drawTree(n - 1,y1,per1 * leng * (0.5 + rand()),th + th1 * (0.5 + rand()));
drawTree(n - 1,per2 * leng * (0.4 + rand()),th - th2 * (0.5 + rand()));
if (rand() > 0.6)
drawTree(n - 1,th - th2 * (0.5 + rand()));
}
voID drawline(double x0,double x1,double y1)
{
graphics.Drawline(
Pens.Blue,
(int)x0,(int)y0,(int)x1,(int)y1);
}
}
}