【闲趣】如何用C语言画出一棵圣诞树

Love The Way You Lie 2023-10-18 13:03 125阅读 0赞

圣诞节快乐！今天教你用C语言画出一棵圣诞树  
下面的是我尝试尽量用最少代码来画一个抽象一点的圣诞树，因此树干都没有。然后，我尝试用更真实一点的风格。因为树是一个比较自相似的形状，这次使用递归方式描述树干和分支。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzcxNzgzOQ_size_16_color_FFFFFF_t_70]  
附上代码：

#include <stdio.h>
    #include <stdlib.h>
    
    int main(int argc, char* argv[]) {
    	int n= argc > 1? atoi(argv[1]) : 4;
    	for (int j= 1;j <=n; j++) {
    		int s= 1<< j,k=(1<< n)-s,x;
    		for (int y=s -j; y>= 0; y--, putchar('\n')) {
    			for(x=0;x<y+k; x++) printf("  ");
    			for(x=0;x+y<s;x++) printf("%c ", '!'^y & x);
    			for(x=1;x+y<s;x++) printf("%c ",'!' ^y &(s-y-x-1));
    						}
    					}
    		}

然后…其他方法：

#include <math.h>
    #include <stdio.h>
    #include <stdlib.h>
    #define PI 3.14159265359
    float sx, sy;
    float sdCircle(float px, float py, float r) {
    	float dx= px- sx, dy = py-sy;
    	return sqrtf(dx*dx+dy* dy)- r;
    			}
    
    float opUnion(float d1, float d2) {
    	return d1<d2? d1: d2;}
    
    #define T px + scale * r* cosf(theta), py + scale * r * sin(theta)
    
    float f(float px, float py, float theta, float scale, int n){
    	float d= 0.0f; 
    	for (float r= 0.0f; r< 0.8f;r += 0.02f)
    		d =  opUnion(d, sdCircle(T, 0.05f * scale * (0.95f - r)));
    	if (n>0)
    		for (int t = -1;t<=1; t+=2){
    			float tt = theta+t* 1.8f;
    		float ss = scale * 0.9f;
    		for (float r= 0.2f; r< 0.8f; r +=0.1f) {
    			d = opUnion(d, f(T, tt, ss * 0.5f, n- 1));
    			ss *= 0.8f;}}
    
    	return d;}
    
    int main(int argc, char* argv[]) {
    	int n=argc > 1 ?atoi(argv[1]) : 3;
    	for (sy = 0.8f; sy > 0.0f; sy -= 0.02f, putchar('\n'))
    		for (sx = -0.35f;sx< 0.35f; sx += 0.01f)
    			putchar(f(0, 0, PI * 0.5f, 1.0f, n)< 0 ?'*':' ');
    		}

最后，加上装饰物，丝带等物品，呀！更好看了呢…完整版代码如下：  
![圣诞树效果图][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6ZqQ5bGF55qE6YGu5aSp5oG26ay8_size_20_color_FFFFFF_t_70_g_se_x_16]

import turtle
    screen = turtle.Screen()
    screen.setup(800,600)
    circle = turtle.Turtle()
    circle.shape('circle')
    circle.color('red')
    circle.speed('fastest')
    circle.up()
    square = turtle.Turtle()
    square.shape('square')
    square.color('green')
    square.speed('fastest')
    square.up()
    circle.goto(0,280)
    circle.stamp()
    k = 0
    for i in range(1, 17):
        y = 30*i
        for j in range(i-k):
            x = 30*j
            square.goto(x,-y+280)
            square.stamp()
            square.goto(-x,-y+280)
            square.stamp()
        if i % 4 == 0:
            x = 30*(j+1)
            circle.color('red')
            circle.goto(-x,-y+280)
            circle.stamp()
            circle.goto(x,-y+280)
            circle.stamp()
            k += 2
        if i % 4 == 3:
            x = 30*(j+1)
            circle.color('yellow')
            circle.goto(-x,-y+280)
            circle.stamp()
            circle.goto(x,-y+280)
            circle.stamp()
    square.color('brown')
    for i in range(17,20):
        y =30*i
        for j in range(3):
            x  = 30*j
            square.goto(x,-y+280)
            square.stamp()
            square.goto(-x,-y+280)
            square.stamp()
    turtle.exitonclick()

赶快来种树吧！  
**知非0202**  
**2018.12.25**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzcxNzgzOQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20181225002747301.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzcxNzgzOQ==,size_16,color_FFFFFF,t_70
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6ZqQ5bGF55qE6YGu5aSp5oG26ay8_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/1d535fb36c96426f870a9629952ec06e.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA6ZqQ5bGF55qE6YGu5aSp5oG26ay8,size_20,color_FFFFFF,t_70,g_se,x_16