C图形化编程简单实现国庆节五星红旗的绘制

#include <graphics.h> #include <math.h> #include <stdio.h> #define PI 3.14 void fivePointedStar(int radius, double startAngle); int main(void) { int width = 900; // 高度为宽度的2/3 int height = width / 3 * 2; // 网格宽度 int grid = width / 2 / 15; // 创建窗体 initgraph(width, height); setbkcolor(RED); cleardevice(); // 翻转坐标轴，设置填充颜色为黄色 setaspectratio(1, -1); setfillcolor(YELLOW); setpolyfillmode(WINDING); // 大五角星 setorigin(grid * 5, grid * 5); fivePointedStar(grid * 3, PI / 2); // 小五角星1 setorigin(grid * 10, grid * 2); double startAngle = atan(3.0 / 5.0) + PI; fivePointedStar(grid, startAngle); // 小五角星2 setorigin(grid * 12, grid * 4); startAngle = atan(1.0 / 7.0) + PI; fivePointedStar(grid, startAngle); // 小五角星3 setorigin(grid * 12, grid * 7); startAngle = -atan(2.0 / 7.0) + PI; fivePointedStar(grid, startAngle); // 小五角星4 setorigin(grid * 10, grid * 9); startAngle = -atan(4.0 / 5.0) + PI; fivePointedStar(grid, startAngle); getchar(); closegraph(); return 0; } void fivePointedStar(int radius, double startAngle) { double delta = 2 * PI / 5; POINT points[5]; // for (int i = 0; i < 5; i++) { points[i].x = (LONG)(cos(startAngle + i * delta * 2) * radius); // 计算x坐标 points[i].y = (LONG)(sin(startAngle + i * delta * 2) * radius); // 计算y坐标 } solidpolygon(points, 5); }