计算机图形学实验代码（全）

#include<gl/glut.h> #include<math.h> #include<windows.h> #include<algorithm> using namespace std; const double PI = acos(-1.0); #define getColor(a) (a/255.0) int cnt; //顶点数 void drawCircle(float x, float y, float r) //画圆 { int n = 100; glBegin(GL_POLYGON); for (int i = 0; i < n; i++) { glVertex2f(r*cos(i * 2 * PI / n)+x, r*sin(i * 2 * PI / n)+y); } glEnd(); } void graphy1() //国民党党徽 { glClear(GL_COLOR_BUFFER_BIT); glColor3f(getColor(14), getColor(0), getColor(140)); //外围大蓝圆 drawCircle(0, 0, 0.7); glColor3f(1, 1, 1); //白色多边形 glBegin(GL_TRIANGLE_FAN); glVertex2f(0, 0); for (int i = 0; i <= 24; i++) { if (i & 1) glVertex2f(0.4*sin(i * 2 * PI / 24), 0.4*cos(i * 2 * PI / 24)); else glVertex2f(0.68*sin(i * 2 * PI / 24), 0.68*cos(i * 2 * PI / 24)); } glEnd(); glColor3f(getColor(14), getColor(0), getColor(140)); //蓝色圆 drawCircle(0, 0, 0.36); glColor3f(1, 1, 1); //白色圆 drawCircle(0, 0, 0.32); glFlush(); } void graphy2() //共青团团徽 { glClear(GL_COLOR_BUFFER_BIT); glColor3f(1, 1, 0); //外围黄色圆 drawCircle(0, 0, 0.7); glColor3f(1, 0, 0); //红色圆 drawCircle(0, 0, 0.65); glColor3f(1, 1, 0); //五角星（填充） glBegin(GL_TRIANGLE_FAN); glVertex2f(0, 0); int i; for (i = 0; i <= 10; i++) { if (i&1) glVertex2f(0.25*sin(i * 2 * PI / 10), 0.25*cos(i * 2 * PI / 10)); else glVertex2f(0.65*sin(i * 2 * PI / 10), 0.65*cos(i * 2 * PI / 10)); } glEnd(); glColor3f(0, 0, 0); //五角星轮廓 for (i = 0; i <= 10; i++) { float p1_x, p1_y, p2_x, p2_y; if (i & 1) { p1_x = 0.25*sin(i * 2 * PI / 10); p1_y = 0.25*cos(i * 2 * PI / 10); p2_x = 0.65*sin((i + 1) * 2 * PI / 10); p2_y = 0.65*cos((i + 1) * 2 * PI / 10); } else { p1_x = 0.65*sin(i * 2 * PI / 10); p1_y = 0.65*cos(i * 2 * PI / 10); p2_x = 0.25*sin((i+1) * 2 * PI / 10); p2_y = 0.25*cos((i+1) * 2 * PI / 10); } glBegin(GL_LINES); glVertex2f(0, 0); glVertex2f(p1_x, p1_y); glVertex2f(0, 0); glVertex2f(p2_x, p2_y); glVertex2f(p1_x, p1_y); glVertex2f(p2_x, p2_y); glEnd(); } glFlush(); } void graphy3() //多边形 { glClear(GL_COLOR_BUFFER_BIT); const float r = 0.7; const float hr = r / 2.0; for (int i = 0; i < cnt; i++) { float p1_x, p1_y, p2_x, p2_y, p3_x, p3_y; p1_x = r*sin(i * 2 * PI / cnt); p1_y = r*cos(i * 2 * PI / cnt); p2_x = r*sin((i+1) * 2 * PI / cnt); p2_y = r*cos((i+1) * 2 * PI / cnt); p3_x = hr*sin((i<<1|1) * PI / cnt); p3_y = hr*cos((i<<1|1) * PI / cnt); glBegin(GL_TRIANGLES); //填充 glColor3f(1, 0, 1); glVertex2f(p1_x, p1_y); glVertex2f(p2_x, p2_y); glVertex2f(p3_x, p3_y); glEnd(); glBegin(GL_TRIANGLE_FAN); glColor3f(1, 1, 1); glVertex2f(0, 0); glVertex2f(p1_x, p1_y); glVertex2f(p3_x, p3_y); glVertex2f(p2_x, p2_y); glEnd(); glBegin(GL_LINES); //边界线条 glColor3f(1, 0, 0); glVertex2f(0, 0); glVertex2f(p1_x, p1_y); glVertex2f(0, 0); glVertex2f(p2_x, p2_y); glColor3f(0, 0, 0); glVertex2f(0, 0); glVertex2f(p3_x, p3_y); glVertex2f(p2_x, p2_y); glVertex2f(p1_x, p1_y); glVertex2f(p3_x, p3_y); glVertex2f(p1_x, p1_y); glVertex2f(p3_x, p3_y); glVertex2f(p2_x, p2_y); glEnd(); } glFlush(); } void initWindow(int &argc, char *argv[], int width, int height, char *title) //初始化并显示到屏幕中央 { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition((GetSystemMetrics(SM_CXSCREEN) - width) >> 1, (GetSystemMetrics(SM_CYSCREEN) - height) >> 1); //指定窗口位置 glutInitWindowSize(width, height); //指定窗口大小 glutCreateWindow(title); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); //设置颜色过渡模式，默认为GL_SMOOTH（渐变） } void welcome() { puts("\n\t说明：\t图案形式选择1：绘制国民党党徽；"); puts("\t\t图案形式不为1，顶点数输入5；绘制共青团团徽！"); puts("\t\t其余绘制花型图案！"); printf("\n请输入图案形式(1：国民党党徽，其余不为1)："); } int main(int argc, char *argv[]) { initWindow(argc, argv, 400, 400, "Test2"); welcome(); int op; scanf("%d", &op); if (op == 1) glutDisplayFunc(&graphy1); else { printf("请输入多边形的顶点数（1<n<100）: "); while (~scanf("%d", &cnt)) { if (cnt == 5) glutDisplayFunc(&graphy2); else if (cnt > 1 && cnt < 100) glutDisplayFunc(&graphy3); else { printf("您的输入有误，请重新输入："); continue; } break; } } glutMainLoop(); return 0; }