版权声明:本人菜鸟一只,如文章有错误或您有高见,请不吝赐教 https://blog.csdn.net/qq_41138935/article/details/82814284
最重要的是理解递归思想,下面是代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.AutoScaleBaseSize = new Size(6,14);
this.ClientSize = new Size(600,400);
this.Paint += new PaintEventHandler(Form1_Paint);
}
static private Graphics graphics;
const double PI = Math.PI;
static double th1 = 40 * Math.PI / 180;
static double th2 = 30 * Math.PI / 180;
static double per1 = 0.6;
static double per2 = 0.7;
static void Form1_Paint(object sender,PaintEventArgs e)
{
graphics = e.Graphics;
drawTree(10, 200, 310, 100, -PI / 2);
}
static 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,n/2);
drawTree(n - 1, x1, y1, per1 * leng, th + th1);
drawTree(n-1,x1,y1,per2*leng,th-th2);
}
static void drawLine(double x0,double y0,double x1,double y1,int width)
{
graphics.DrawLine(
new Pen(Color.Blue, width),
(int)x0, (int)y0, (int)x1, (int)y1);
}
}
}
实现画不同的树:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApp2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.AutoScaleBaseSize = new Size(6, 14);
this.ClientSize = new Size(600, 400);
this.Paint += new PaintEventHandler(this.Form1_Paint);
this.Click += new EventHandler(this.Redraw);
}
private void Form1_Paint(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, x1, y1, per1 * leng * (0.5 + rand()), th + th1 * (0.5 + rand()));
drawTree(n - 1, x1, y1, per2 * leng * (0.4 + rand()), th - th2 * (0.5 + rand()));
if (rand() > 0.6)
drawTree(n - 1, x1, y1, per2 * leng * (0.4 + rand()), th - th2 * (0.5 + rand()));
}
void drawLine(double x0, double y0, double x1, double y1)
{
graphics.DrawLine(
Pens.Blue,
(int)x0, (int)y0, (int)x1, (int)y1);
}
}
}