C语言/C++常见习题问答集锦之五环破冰

唯米天空

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2022-02-06

C语言/C++常见习题问答集锦之五环破冰

程序之美

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前言

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在这里插入图片描述

主体

首先我们来绘制一颗五星，看看效果吧。

运行效果一

代码示例

#include <graphics.h>
#include <Windows.h>
#include <conio.h>


#define RED 4

#define LIGHTRED 12

float rad = 3.1415926 / 180.0;

float k = 640 / 480;

void star(float x0, float y0, float R);

void shine(int R, int r, int data)
{
	int x0[36], y0[36];

	int x1[36], y1[36];

	int i, data0 = 0;

	int X = getmaxx() / 2, Y = getmaxy() / 2;

	for (i = 0; i < 18; i++)
	{
		x0[i] = X + r * sin((data0 + data)*rad);

		y0[i] = Y + k * r*cos((data0 + data)*rad);

		x1[i] = X + R * sin((data0 + data)*rad);

		y1[i] = Y + k * R*cos((data0 + data)*rad);

		data += 20;

		setcolor(rand()% 255);

		Sleep(20);

		line(x0[i], y0[i], x1[i], y1[i]);

	}
}

int main()
{
	float x, y, Radius;

	int step = 0;

	initgraph(640, 480);

	setbkcolor(RED);

	cleardevice();

	x = getmaxx() / 2; y = getmaxy() / 2;

	Radius = getmaxy() / 5;

	star(x, y, Radius);

	while (!_kbhit())
	{
		Radius = getmaxy() / 4;

		step = 20 + rand()%40;

		shine(Radius, Radius + step, 0); Sleep(100);

		step += 20; Radius += 20;

		shine(Radius, Radius + step, 10); Sleep(100);

		step += 20; Radius += 20;

		shine(Radius, Radius + step, 20); Sleep(200);
	}
	
	closegraph();
	exit(0);

	return 0;
}

void star(float x0, float y0, float R)
{
	int x[5], y[5], x1[5], y1[5];

	float r;

	int i, a = 18;

	for (i = 0; i < 5; i++)
	{
		x[i] = x0 + R * cos(a*rad)*k;

		y[i] = y0 - R * sin(a*rad);

		a += 72;

	}

	r = R * (sin(18 * rad) / sin(54 * rad));

	a = 54;

	for (i = 0; i < 5; i++)
	{
		x1[i] = x0 + r * cos(a*rad)*k;

		y1[i] = y0 - r * sin(a*rad);

		a += 72;

	}

	setcolor(RED);

	line(x0, y0, x[0], y[0]);

	line(x0, y0, x1[4], y1[4]);

	line(x[0], y[0], x1[4], y1[4]);

	setfillstyle(SOLID_FILL, RED);

	floodfill(x1[4], y1[4] - 1, RED);

	setcolor(RED);

	line(x0, y0, x[2], y[2]);

	line(x0, y0, x1[2], y1[2]);

	line(x[2], y[2], x1[2], y1[2]);

	setfillstyle(SOLID_FILL, RED);

	floodfill(x1[2], y1[2] - 1, RED);

	setcolor(LIGHTRED);

	line(x[0], y[0], x1[0], y1[0]);

	line(x0, y0, x1[0], y1[0]);

	line(x0, y0, x[0], y[0]);

	setfillstyle(SOLID_FILL, LIGHTRED);

	floodfill(x1[0], y[0] + 1, LIGHTRED);

	setcolor(RED);

	line(x0, y0, x1[0], y1[0]);

	line(x0, y0, x[1], y[1]);

	setfillstyle(SOLID_FILL, LIGHTRED);

	floodfill(x1[0] - 1, y1[0], RED);

	setcolor(LIGHTRED);

	line(x[1], y[1], x1[1], y1[1]);

	line(x1[1], y1[1], x[2], y[2]);

	line(x0, y0, x[1], y[1]);

	line(x0, y0, x[2], y[2]);

	setcolor(LIGHTRED);

	line(x0, y0, x1[2], y1[2]);

	line(x0, y0, x[3], y[3]);

	line(x1[2], y1[2], x[3], y[3]);

	setfillstyle(SOLID_FILL, LIGHTRED);

	floodfill(x1[2] + 1, y1[2] + 1, LIGHTRED);

	floodfill(x1[1] + 1, y1[1] + 1, LIGHTRED);

	setcolor(RED);

	line(x0, y0, x[3], y[3]);

	line(x0, y0, x[4], y[4]);

	line(x[3], y[3], x1[3], y1[3]);

	line(x1[3], y1[3], x[4], y[4]);

	setfillstyle(SOLID_FILL, RED);

	floodfill(x1[3], y1[3] - 1, RED);

	setcolor(LIGHTRED);

	line(x0, y0, x[4], y[4]);

	line(x0, y0, x1[4], y1[4]);

	line(x[4], y[4], x1[4], y1[4]);

	setfillstyle(SOLID_FILL, LIGHTRED);

	floodfill(x1[4] - 1, y1[4] + 1, LIGHTRED);

}

代码分析

初始化

变量初始化

	float x, y, Radius;

	int step = 0;

	initgraph(640, 480);

	setbkcolor(RED);

	cleardevice();

绘制五星

	x = getmaxx() / 2; y = getmaxy() / 2;

	Radius = getmaxy() / 5;

	star(x, y, Radius);

核心逻辑

	while (!_kbhit())
	{
		Radius = getmaxy() / 4;

		step = 20 + rand()%40;

		shine(Radius, Radius + step, 0); Sleep(100);

		step += 20; Radius += 20;

		shine(Radius, Radius + step, 10); Sleep(100);

		step += 20; Radius += 20;

		shine(Radius, Radius + step, 20); Sleep(200);
	}

绘制闪光的函数为：

void shine(int R, int r, int data)
{
	int x0[36], y0[36];

	int x1[36], y1[36];

	int i, data0 = 0;

	int X = getmaxx() / 2, Y = getmaxy() / 2;

	for (i = 0; i < 18; i++)
	{
		x0[i] = X + r * sin((data0 + data)*rad);

		y0[i] = Y + k * r*cos((data0 + data)*rad);

		x1[i] = X + R * sin((data0 + data)*rad);

		y1[i] = Y + k * R*cos((data0 + data)*rad);

		data += 20;

		setcolor(rand()% 255);

		Sleep(20);

		line(x0[i], y0[i], x1[i], y1[i]);

	}
}

资源释放

	closegraph();
	exit(0);

五环中有蓝、黄、黑、绿、红5种色彩。

运行效果二

绘制五环效果图
在这里插入图片描述

代码示例

#include<graphics.h>

#include<stdio.h>

int main()
{

	initgraph(640, 480);

	setbkcolor(WHITE);   //设置背景色

	cleardevice();

	setlinestyle(PS_SOLID, 3);//设置粗实线

	setcolor(BLUE);      //蓝色

	circle(100, 100, 50);


	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(YELLOW);      //黄色

	circle(170, 150, 50);


	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(BLACK);      //灰色色

	circle(240, 100, 50);


	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(GREEN);      //绿色

	circle(310, 150, 50);


	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(RED);      //红色

	circle(380, 100, 50);


	getchar();

	closegraph();

	return 0;

}

代码分析

初始化

	initgraph(640, 480);

	setbkcolor(WHITE);   //设置背景色

	cleardevice();

核心逻辑

绘制蓝色环

	setlinestyle(PS_SOLID, 3);//设置粗实线

	setcolor(BLUE);      //蓝色

	circle(100, 100, 50);

绘制黄色环

	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(YELLOW);      //黄色

	circle(170, 150, 50);

绘制灰色环

	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(BLACK);      //灰色色

	circle(240, 100, 50);

绘制绿色环

	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(GREEN);      //绿色

	circle(310, 150, 50);

绘制红色环

	setlinestyle(PS_SOLID, 3); //设置粗实线

	setcolor(RED);      //红色

	circle(380, 100, 50);

资源释放

	closegraph();
五⭐红旗迎风飘扬
......
......
......
⭐⭐⭐⭐⭐

运行效果三

代码示例

// test42.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include<graphics.h>
#include<math.h>
#include<stdio.h>
#include<conio.h>
int main()
{
	double q, t, w, v;
	double x[5], y[5], x1[5], x2[5], y1[5], y2[5];
	int i, j, x0 = 50, y0 = 50, r = 30, m = 20, a = 10, b = 5, k, n;
	t = (2 * 3.1415926) / 5;
	v = (2 * 3.1415926) / 12;
	initgraph(1280, 720);
	setcolor(YELLOW);
	setbkcolor(RED);
	cleardevice();

	for (i = 0; i <= 4; i++)
	{
		q = t * i;
		x[i] = r * cos(q) + x0;
		y[i] = r * sin(q) + y0;
	}
	moveto(x[0], y[0]);
	lineto(x[2], y[2]);
	lineto(x[4], y[4]);
	lineto(x[1], y[1]);
	lineto(x[3], y[3]);
	lineto(x[0], y[0]);
	lineto(x[2], y[2]);
	setfillstyle(1, YELLOW);
	floodfill(x0, y0, YELLOW);
	for (i = 0; i <= 4; i++)
	{
		q = t * i;
		x1[i] = m * cos(q) + x0;
		y1[i] = m * sin(q) + y0;
		setfillstyle(1, YELLOW);
		floodfill(x1[i], y1[i], YELLOW);
	}
	for (j = 0; j <= 3; j++)
	{
		w = v * j;
		x2[j] = 120 * cos(w) - 50 * sin(w) + 50 * (1 - cos(w)) + 50 * sin(w);
		y2[j] = 120 * sin(w) + 50 * cos(w) + 50 * (1 - cos(w)) - 50 * sin(w);
		for (k = 0; k <= 4; k++)
		{
			q = t * k;
			x[k] = a * cos(q) + x2[j];
			y[k] = a * sin(q) + y2[j];
		}
		moveto(x[0], y[0]);
		lineto(x[2], y[2]);
		lineto(x[4], y[4]);
		lineto(x[1], y[1]);
		lineto(x[3], y[3]);
		lineto(x[0], y[0]);
		lineto(x[2], y[2]);
		setfillstyle(1, YELLOW);
		floodfill(x2[j], y2[j], YELLOW); 
		for (k = 0; k <= 4; k++)
		{
			q = t * k;
			x1[k] = b * cos(q) + x2[j];
			y1[k] = b * sin(q) + y2[j];
			setfillstyle(1, YELLOW);
			floodfill(x1[k], y1[k], YELLOW);
		}
	}
	_getch();
	closegraph();

	return 0;
}

代码分析

初始化

	double q, t, w, v;
	double x[5], y[5], x1[5], x2[5], y1[5], y2[5];
	int i, j, x0 = 50, y0 = 50, r = 30, m = 20, a = 10, b = 5, k, n;
	t = (2 * 3.1415926) / 5;
	v = (2 * 3.1415926) / 12;
	initgraph(1280, 720);
	setcolor(YELLOW);
	setbkcolor(RED);
	cleardevice();

核心逻辑

	for (i = 0; i <= 4; i++)
	{
		q = t * i;
		x[i] = r * cos(q) + x0;
		y[i] = r * sin(q) + y0;
	}
	moveto(x[0], y[0]);
	lineto(x[2], y[2]);
	lineto(x[4], y[4]);
	lineto(x[1], y[1]);
	lineto(x[3], y[3]);
	lineto(x[0], y[0]);
	lineto(x[2], y[2]);
	setfillstyle(1, YELLOW);
	floodfill(x0, y0, YELLOW);
	for (i = 0; i <= 4; i++)
	{
		q = t * i;
		x1[i] = m * cos(q) + x0;
		y1[i] = m * sin(q) + y0;
		setfillstyle(1, YELLOW);
		floodfill(x1[i], y1[i], YELLOW);
	}
	for (j = 0; j <= 3; j++)
	{
		w = v * j;
		x2[j] = 120 * cos(w) - 50 * sin(w) + 50 * (1 - cos(w)) + 50 * sin(w);
		y2[j] = 120 * sin(w) + 50 * cos(w) + 50 * (1 - cos(w)) - 50 * sin(w);
		for (k = 0; k <= 4; k++)
		{
			q = t * k;
			x[k] = a * cos(q) + x2[j];
			y[k] = a * sin(q) + y2[j];
		}
		moveto(x[0], y[0]);
		lineto(x[2], y[2]);
		lineto(x[4], y[4]);
		lineto(x[1], y[1]);
		lineto(x[3], y[3]);
		lineto(x[0], y[0]);
		lineto(x[2], y[2]);
		setfillstyle(1, YELLOW);
		floodfill(x2[j], y2[j], YELLOW); 
		for (k = 0; k <= 4; k++)
		{
			q = t * k;
			x1[k] = b * cos(q) + x2[j];
			y1[k] = b * sin(q) + y2[j];
			setfillstyle(1, YELLOW);
			floodfill(x1[k], y1[k], YELLOW);
		}
	}

这里我们在绘制五星的过程中主要使用了数学公式中的正弦函数sin和余弦函数cos。
在这里插入图片描述
在这里插入图片描述

资源释放

	closegraph();

结束语

好了，今天就说这么多了，希望小伙伴们能从这篇文章中学到东西，也真心希望能够帮助正在苦学C语言的小伙伴们，你们的成长是我最大的幸福。很感谢您能够在百忙之中浏览我的文章。

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