用C++画心形曲线： 送给母亲的心（母亲节2020.5.10）

递归随机输出版（本文中是涟漪状输出）
昨天是母亲节，本人在家无事，编写了一个在windows终端下画一颗心的C++程序，母上大人似乎甚为欣悦。

1 运行效果

1.1 低清版

启动计算中…
（Sleep 用来造势）
计算完成：左上角有实时的计算结果刷新。

按下回车

按任意键画心，若涟漪般展开。


起始位置是随机发生的。

按ESC结束程序。

1.2 高清版

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和低清版无别，只是分辨率更高（线性上是原来的5倍），清晰了25倍。

下面给出低清版的源码。
p.s. 低清版代码没有做任何优化，假如需要做高清版请自行优化。

2 源码

/************ By Guhz 2020.5.10 ************/ #include <iostream> #include <ctime> #include <cmath> #include <windows.h> #include <conio.h> #define WB "color 70" //WB: White backgroud & Black foregroud #define WR "color 7C" //WR: White backgroud & Red foregroud #define unit "* " #define ESC 27 #define posHeartX 50 #define posHeartY 5 /**************************************************************************************** Color List: 0=Black 1=Blue 2=Green 3=Ocean blue 4=Red 5=Purple 6=Yellow 7=White 8=Grey 9=Light blue A=Light green B=Sky blue C=Light red D=Light purple E=Light yellow F=Bright white ****************************************************************************************/ enum {row = 46,col = 47 }; bool Heart[row * col]; void init(void); void goto_xy(int x, int y); void illuminate(void); //TODO: Visually illuminate the process of calculating. void show(void); //Show the heart shape as if a drop of red ink in the water. int main(void) {using std::cin;using std::cout;int key = 0;system(WB); //WB: White backgroud & Black foregroudinit();illuminate();cin.get();system(WR); //White backgroud & Red foregroudwhile ((key = getch()) && (key != ESC)) //Press ESC to quit.{system("cls");show();}cout << "nPress any key to continue.n";cin.get(); //Let everythinig just stop here. Untill you press any key.return 0; } void init(void) {for (int i = 0; i < row; i++)for (int j = 0; j < col; j++)Heart[i * col + j] = false; } void goto_xy(int x, int y) //瀹氫綅鍏夋爣浣嶇疆鍒版寚瀹氬潗鏍? {HANDLE hOut;hOut = GetStdHandle(STD_OUTPUT_HANDLE);COORD pos = {x, y};SetConsoleCursorPosition(hOut, pos); } void illuminate(void) {using std::cout;double x, y, leftValue, rightValue;for (int i = 0; i < row; i++){for (int j = 0; j < col; j++){x = -1.15 + 0.05 * j;y = +1.25 - 0.05 * i;leftValue = x * x * y * y * y;rightValue = pow(x * x + y * y - 1, 3);if (leftValue >= rightValue) //Heart curve: x^2*y^3>=(x^2+y^2-1)^3{Heart[i * col + j] = true;goto_xy(0, 0);cout << "v positive " << leftValue << " >= " << rightValue;goto_xy(posHeartX + 2 * j, posHeartY + i);cout << "|";}else{Heart[i * col + j] = false;goto_xy(0, 0);cout << "x negative " << leftValue << " < " << rightValue;goto_xy(posHeartX + 2 * j, posHeartY + i);cout << "O";}Sleep(7);}} } void show(void) {using std::cout;int fromWhere;int x, y;srand((unsigned int)clock()); //Let the random seed depends on timedo{fromWhere = rand() % (row * col); //fromWhere: 0~row*col-1} while (Heart[fromWhere] == false);x = fromWhere / col;y = fromWhere % col;int Rx, Ry, Rmax;Rx = x > (row - 1 - x) ? x : (row - 1 - x);Ry = y > (col - 1 - y) ? y : (col - 1 - y);Rmax = (int)sqrt(Rx * Rx + Ry * Ry) + 1;for (int r = 1; r < Rmax; r++){for (int i = 0; i < row; i++){for (int j = 0; j < col; j++){if ((((i - x) * (i - x) + (j - y) * (j - y)) < r * r) && Heart[i * col + j]) //In the circle && Be a part of the heart{goto_xy(posHeartX + 2 * j, posHeartY + i);cout << unit;}}}Sleep(20);} }