该程序能够创建一个窗口并在我的鼠标在窗口上时定位它,但是显示功能似乎确实有效。我在这里想念什么?
float pointSize = 10.0f;
bool leftBottState;
float xvalue;
float yvalue;
void init()
{
glClearColor(0.0, 0.0, 0.0, 0.0);
}
void dots()
{
glBegin(GL_POINTS);
glVertex3f(xvalue, yvalue, 0.0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1, 0, 1);
dots();
glEnd();
glFlush();
}
void mouse(int button, int state, int x, int y)
{
y = 600 - y;
if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
{
leftBottState = true;
}
else
{
leftBottState = false;
}
}
void motion(int x, int y)
{
if (leftBottState)
{
std::cout << "LEFt bUTTON " << std::endl;
xvalue = x;
yvalue = y;
glutPostRedisplay();
}
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutInitWindowSize(600, 600);
glutCreateWindow("test");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
return(0);
}