利用OpenGL绘制棋盘格

#define GLUT_DISABLE_ATEXIT_HACK #include <windows.h> #include <iostream> #include <gl/glut.h> using namespace std; #define screenWidth 640 #define screenHeight 480 int size; void myInit(void) { glClearColor(1.0, 1.0, 1.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, (GLdouble)screenWidth, 0.0, (GLdouble)screenHeight); } void checkerboard(int size) { glClear(GL_COLOR_BUFFER_BIT); GLdouble length = size / 8.0; for(int i = 0; i < 8; i++) for(int j = 0; j < 8; j++) { if((i + j) % 2 == 0) glColor3f(0.6, 0.6, 0.6); else glColor3f(0.0, 0.0, 0.0); glRectf((screenWidth - size) / 2.0 + j * length, (screenHeight - size) / 2.0 + i * length, (screenWidth - size) / 2.0 + (j + 1) * length, (screenHeight -size) / 2.0 + (i + 1) * length); } glFlush(); } void myDisplay(void) { checkerboard(size); } void main(int argc, char **argv) { glutInit(&argc, argv); cout << "Enter the size of the checkerboard(not bigger than 480):"; cin >> size; glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowPosition(100, 150); glutInitWindowSize(screenWidth, screenHeight); glutCreateWindow("Checkboard"); glutDisplayFunc(myDisplay); myInit(); glutMainLoop(); }