C语言实现一个闪烁的圣诞树

圣诞节来啦!看到很多小伙伴用各种语言画出了圣诞树,于是就想用 C 语言来画一颗圣诞树,有点粗糙,下面先来看一下效果图吧!

图1 圣诞树

下面来看下源码,如下所示:

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <stdbool.h>
 
#define N 15
char str[] = {"*", " ", "@", " ", "#", " ", """,  " ", "$", " ", "%", " ", "&", " ", "!"};
 
void color(int a)
{
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), a);
}
 
void getCoord(double y, double x)
{
    COORD pos = { x,y };
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
}
 
void hideCursor()
{
    CONSOLE_CURSOR_INFO cursor= { 1, 0 };
    SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cursor);
}
 
void layer(int x, int y, int num, int col) {
    color(col);
    getCoord(x, y);
    int idx = rand()%N;
    printf("%c", str[idx]);
    for(int k = 1; k <= num; ++k) {
        idx = rand()%N;
        getCoord(x + k - 1, y);
        printf("%c", str[idx]);
        for(int i = 1; i <= (k*2-1)/2; i++) {
            getCoord(x + k - 1, y - i);
            idx = rand()%N;
            printf("%c", str[idx]);
            getCoord(x + k - 1, y + i);
            idx = rand()%N;
            printf("%c", str[idx]);
        }
    }
 
}
 
void triangle(int x, int y, int num, int col) {
    getCoord(x, y);
    color(col);
    printf("*");
 
    for(int i = 1; i <= num; ++i) {
            int x1 = x + i;
            int y1 = y - i;
        for(int j = 0; j < i * 2 + 1; ++j) {
            getCoord(x1, y1 + j);
            printf("*"); 
        }
    }
}
 
void triangleRight(double x, double y, double num, double col) {
    getCoord(x, y*2);
    color(col);
    printf("*");
 
    for(int i = 1; i <= num; ++i) {
            double x1 = x - i;
            double y1 = y - i;
        for(int j = 0; j < i * 2 + 1; ++j) {
            getCoord(x1 + j, y1 * 2);
            printf("*"); 
        }
    }
}
 
void triangleLeft(double x, double y, double num, double col) {
    getCoord(x, y*2);
    color(col);
    printf("*");
    for(int i = 1; i <= num; ++i) {
            double x1 = x - i;
            double y1 = y + i;
        for(int j = 0; j < i * 2 + 1; ++j) {
            getCoord(x1 + j, y1 * 2);
            printf("*"); 
        }
    }
}
 
void rectangle(int x, int y, int h, int w, int col1, int col2) {
    color(col1);
    for(int i = 0; i <= h; ++i) {
        for(int j = 0; j <= w/2; ++j) {
            getCoord(x + i, y - j);
            if(i % 3 || j % 2)
                printf("*");
            else {
                color(col2);
                printf("!");
                color(col1);
            }
                
            getCoord(x + i, y + j);
            if(i % 3 || j % 2)
                printf("*");
            else {
                color(col2);
                printf("!");
                color(col1);
            }
            
        }
    }
}
 
int main() {
    hideCursor();
    int colTop = 4;
    int colMid = 4;
    int colEnd = 13;
    while(true) {
        colTop = colTop == 4 ? 9 : 4;
        triangleLeft(5, 27.8, 2, colTop);
        triangleRight(5, 27.8, 2, colTop);
        Sleep(100);
        layer(5, 55, 10, 2);
        layer(9, 55, 16, 2);
        layer(14, 55, 26, 2);
        colMid = colMid == 4 ? 5 : 4;
        triangle(11, 55, 3, colMid);
        triangle(19, 60, 3, colMid);
        triangle(29, 42, 3, colMid);
        triangle(31, 57, 3, colMid);
        colEnd = colEnd == 13 ? 1 : 13;
        rectangle(40, 55, 15, 18, 6, colEnd);
        Sleep(200);
    }
    return 0;
}

上面便是圣诞树的简单实现,下面来说下原理:

函数 layer 画出树的层次,根据坐标来输出位置;

void layer(int x, int y, int num, int col) 

函数 triangle 画出小三角形,作为点缀;

void triangle(int x, int y, int num, int col)

函数 triangleRight 和 triangleLeft 画出圣诞树顶部的蝴蝶结;

void triangleRight(double x, double y, double num, double col);
void triangleLeft(double x, double y, double num, double col);

函数 hideCursor 负责隐藏光标;

void hideCursor()

函数 getCoord 负责确定输出字符的位置;

void getCoord(double y, double x)

函数 color 负责设置输出的颜色;

void color(int a)

主函数的原理如下:

void color(int a)

主函数通过一个 while 循环,不断刷新圣诞树和圣诞树点缀的颜色。