武汉的樱花开了！出不了门别担心，线上带你开樱花！[Python画樱花]

武汉的樱花开了！出不了门别担心，线上带你"开"樱花！[Python画樱花]

Python实现部分转载自Soul fragments：https://blog.csdn.net/weixin_43943977/article/details/102691392?utm_source=app

阳春三月，草长莺飞。今天下午，百年珞珈、纯美樱花，我们线上赏樱花！

在家用python写了三种樱花树，希望你们能够喜欢。

1 樱花树
动态生成樱花
效果图（这个是动态的）：
在这里插入图片描述
实现代码（Python）：

import turtle as T
import random
import time# 画樱花的躯干(60,t)
def Tree(branch, t):time.sleep(0.0005)if branch > 3:if 8 <= branch <= 12:if random.randint(0, 2) == 0:t.color('snow')  # 白else:t.color('lightcoral')  # 淡珊瑚色t.pensize(branch / 3)elif branch < 8:if random.randint(0, 1) == 0:t.color('snow')else:t.color('lightcoral')  # 淡珊瑚色t.pensize(branch / 2)else:t.color('sienna')  # 赭(zhě)色t.pensize(branch / 10)  # 6t.forward(branch)a = 1.5 * random.random()t.right(20 * a)b = 1.5 * random.random()Tree(branch - 10 * b, t)t.left(40 * a)Tree(branch - 10 * b, t)t.right(20 * a)t.up()t.backward(branch)t.down()# 掉落的花瓣
def Petal(m, t):for i in range(m):a = 200 - 400 * random.random()b = 10 - 20 * random.random()t.up()t.forward(b)t.left(90)t.forward(a)t.down()t.color('lightcoral')  # 淡珊瑚色t.circle(1)t.up()t.backward(a)t.right(90)t.backward(b)# 绘图区域
t = T.Turtle()
# 画布大小
w = T.Screen()
t.hideturtle()  # 隐藏画笔
t.getscreen().tracer(5, 0)
w.screensize(bg='wheat')  # wheat小麦
t.left(90)
t.up()
t.backward(150)
t.down()
t.color('sienna')# 画樱花的躯干
Tree(60, t)
# 掉落的花瓣
Petal(200, t)
w.exitonclick()

2 飘落效果樱花树

效果图：
在这里插入图片描述
实现代码：

from turtle import *
from random import *
from math import *def tree(n,l):pd()#下笔#阴影效果t = cos(radians(heading()+45))/8+0.25pencolor(t,t,t)pensize(n/3)forward(l)#画树枝if n>0:b = random()*15+10 #右分支偏转角度c = random()*15+10 #左分支偏转角度d = l*(random()*0.25+0.7) #下一个分支的长度#右转一定角度,画右分支right(b)tree(n-1,d)#左转一定角度，画左分支left(b+c)tree(n-1,d)#转回来right(c)else:#画叶子right(90)n=cos(radians(heading()-45))/4+0.5pencolor(n,n*0.8,n*0.8)circle(3)left(90)#添加0.3倍的飘落叶子if(random()>0.7):pu()#飘落t = heading()an = -40 +random()*40setheading(an)dis = int(800*random()*0.5 + 400*random()*0.3 + 200*random()*0.2)forward(dis)setheading(t)#画叶子pd()right(90)n = cos(radians(heading()-45))/4+0.5pencolor(n*0.5+0.5,0.4+n*0.4,0.4+n*0.4)circle(2)left(90)pu()#返回t=heading()setheading(an)backward(dis)setheading(t)pu()backward(l)#退回bgcolor(0.5,0.5,0.5)#背景色
ht()#隐藏turtle
speed(0)#速度 1-10渐进，0 最快
tracer(0,0)
pu()#抬笔
backward(100)
left(90)#左转90度
pu()#抬笔
backward(300)#后退300
tree(12,100)#递归7层
done()

3 暗色效果樱花树
效果图：
在这里插入图片描述
实现代码：

from turtle import *
from random import *
from math import *def tree(n, l):pd()t = cos(radians(heading() + 45)) / 8 + 0.25pencolor(t, t, t)pensize(n / 4)forward(l)if n > 0:b = random() * 15 + 10c = random() * 15 + 10d = l * (random() * 0.35 + 0.6)right(b)tree(n - 1, d)left(b + c)tree(n - 1, d)right(c)else:right(90)n = cos(radians(heading() - 45)) / 4 + 0.5pencolor(n, n, n)circle(2)left(90)pu()backward(l)
bgcolor(0.5, 0.5, 0.5)
ht()
speed(0)
tracer(0, 0)
left(90)
pu()
backward(300)
tree(13, 100)
done()

4 网页樱花树
效果图（动态效果）：
在这里插入图片描述

实现程序：

<!doctype html>
<html>
<head>
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Cache-Control" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no" />
<style type="text/css">
canvas{position: absolute;left: 0;top: 0;
}
</style>
</head>
<body bgcolor="#000000">
<canvas id="tree"></canvas>
<canvas id="flower"></canvas>
<script>
//两个canvas
var tree = document.getElementById("tree");
tree.width = window.innerWidth;
tree.height = window.innerHeight ;
var tCxt = tree.getContext("2d");
var flower = document.getElementById("flower");
flower.width = window.innerWidth;
flower.height = window.innerHeight ;
var cxt = flower.getContext("2d");var flowerList = [];//樱花列表
var rootTop = 450 ;//树起点
var flowerColor = "rgba(255,192,203,.3)" ;//花色
var flowerColorDeep = "rgba(241,158,194,.5)" ;//花色深
var treeColor2 = "rgba(255,192,203,.5)" ;//树枝颜色
var treeColor = "#FFF" ;//树干颜色
var fallList = [];//飘落樱花列表
var g = 0.01 ;//重力加速度
var gWind = 0.005;//风力加速度
var limitSpeedY = 1;//速度上限
var limitSpeedX = 1 ;//速度上限cxt.shadowColor= "#FFF" ;
cxt.shadowBlur = 10 ;function drawTree(x,y,deg,step,type){var deg1 = step%2 == 0 ? 0.1 : -0.1 ;var x1 = x + Math.cos(deg+deg1) * (step+4) * 0.8 ;//以步长来判断枝干长度 x轴偏移大一些var y1 = y + Math.sin(deg+deg1) * (step-1) * 0.8 ;//以步长来判断枝干长度 Y轴压缩一些tCxt.beginPath();tCxt.lineWidth = step/3;tCxt.moveTo(x,y);tCxt.lineTo(x1,y1);tCxt.strokeStyle = (step > 5 ) ? treeColor : treeColor2 ;//细纸条都换成花的颜色tCxt.stroke();if(step > 20){//树干相交的位置有间隙，以一个圆填充tCxt.fillStyle = treeColor ;tCxt.arc(x,y,step/6,0,Math.PI*2);tCxt.fill();}if(step < 3 || (step < 23 && Math.random() > 0.1)){//末梢位置 画花瓣var color = [flowerColorDeep,flowerColor,flowerColor][Math.round(Math.random()+0.2)] ;var r = 2+Math.random()*2tCxt.fillStyle = color ;tCxt.arc(x1+Math.random()*3,y1+Math.random()*3,r,0,Math.PI)tCxt.fill();flowerList.push({x:x,y:y,sx:(Math.random()-0.5),sy:0,color:color,r:r,deg:deg});//保存下画樱花的位置}step -- ;if(step > 0){drawTree(x1,y1,deg,step,type);if(step%3 == 1 && step > 0 && step < 30)drawTree(x1,y1,deg+0.2 + 0.3 * Math.random(),Math.round(step/1.13));//右分叉if(step%3 == 0 && step > 0 && step < 30)drawTree(x1,y1,deg-0.2 - 0.3 * Math.random(),Math.round(step/1.13));//左分叉}
}drawTree(tree.width/2,rootTop,-Math.PI/2,30,1);//执行var len = flowerList.length ;
function step(){if(Math.random() > 0.3)    fallList.push(flowerList[Math.floor(Math.random()*len)]);//随机取出一个，花瓣复制到飘落花瓣的列表中cxt.clearRect(0,0,tree.width,tree.height);for(var i = 0 ;i < fallList.length ; i ++){if(fallList[i].sy < limitSpeedY) fallList[i].sy += g ;fallList[i].sx += gWind ;fallList[i].x += fallList[i].sx ;fallList[i].y += fallList[i].sy ;if(fallList[i].y > rootTop+30){//飘到树根+30的花瓣移除fallList.splice(i,1);i -- ;continue ;}cxt.beginPath();cxt.fillStyle = fallList[i].color ;fallList[i].deg += fallList[i].sx*0.05 ;//跟速度相关的旋转花瓣cxt.arc(fallList[i].x,fallList[i].y,fallList[i].r,fallList[i].deg,fallList[i].deg+Math.PI*1.3);cxt.fill();}requestAnimationFrame(step);
}
requestAnimationFrame(step);
</script>
</body>
</html>