绘制五角星
使用滚动条模板:https://www.cnblogs.com/eternalmoonbeam/p/10827792.html
#define _USE_MATH_DEFINES
#include<cmath>
在WM_PAINT——BeginPaint和EndPaint中写:
x = xChar * xPos; y = yChar * yPos; MoveToEx(hdc, xStar - x, yStar - y, NULL); LineTo(hdc, xStar - SideLength / 2 - x, yStar + SideLength * (cos(double(3 * M_PI / 10)) + cos(double(M_PI / 10))) - y); LineTo(hdc, xStar + SideLength * cos(double(M_PI / 5)) - x, yStar + SideLength * cos(double(3 * M_PI / 10)) - y); LineTo(hdc, xStar - SideLength * cos(double(M_PI / 5)) - x, yStar + SideLength * cos(double(3 * M_PI / 10)) - y); LineTo(hdc, xStar + SideLength / 2 - x, yStar + SideLength * (cos(double(3 * M_PI / 10)) + cos(double(M_PI / 10))) - y); LineTo(hdc, xStar - x, yStar - y);