int main(int argc, char** argv) {
//if neither one or two parameters are input in command line, output the instruction of the usage of the program
std::cout<<"argc"<<argc<<std::endl;
if (argc < 2 || argc > 5) {
std::cerr << "Usage: " << argv[0] << " [filename][writename][option] " << std::endl;
exit(1);
}
//if second parameter is specified, store the file name to write the image
else if (argc == 3)
{
std::string arg = argv[2];
if (arg == "-pv"){ pvtag = 1; std::cout << "pvtag set." << std::endl; }
else if (arg == "-ss"){ sstag = 1; std::cout << "sstag set." << std::endl;}
else
{
writename = argv[2];
std::cout << "writename is " << writename << std::endl;
}
}
else if (argc == 4)
{
std::string arg = argv[3];
std::string arg2 = argv[2];
if (arg == "-pv" && arg2 != "-ss")
{
pvtag = 1;
writename = argv[2];
std::cout << "writename is " << writename << std::endl;
std::cout << "pvtag is set." << std::endl;
}
else if (arg == "-ss" && arg2 != "-pv")
{
sstag = 1;
writename = argv[2];
std::cout << "writename is " << writename << std::endl;
std::cout << "sstag is set." << std::endl;
}
else if ((arg == "-ss" && arg2 == "-pv") || (arg == "-pv" && arg2 == "-ss"))
{
sstag = 1;
pvtag = 1;
std::cout << "sstag is set." << std::endl;
std::cout << "pvtag is set." << std::endl;
}
else
{
std::cerr << "Usage: " << argv[0] << " [filename][writename][option] " << std::endl;
exit(1);
}
}
else //argc == 5
{
std::string arg1 = argv[3], arg2 = argv[4];
if (((arg1 == "-pv") && (arg2 == "-ss"))||((arg1 == "-ss") && (arg2 == "-pv")))
{
pvtag = 1;
sstag = 1;
writename = argv[2];
std::cout << "writename is " << writename << std::endl;
std::cout << "sstag and pvtag are set." << std::endl;
}
}
//get the filename of the image, set the filename and read the image to get basic information of it
filename = argv[1];
std::cout << filename << std::endl;
Image.SetFilename(filename);
Image.ImageRead();
Image.SetOriginalData();
int h = Image.GetHeight();
int w = Image.GetWidth();
int c = Image.GetChannel();
mask();
//start up the glut utilities
glutInit(&argc, argv);
//create the graphics window, giving width, height and title text
glutInitDisplayMode(GLUT_SINGLE | GLUT_DEPTH | GLUT_RGBA);
glutInitWindowSize((Image.GetWidth()),Image.GetHeight());
glutCreateWindow("Image");
//glut keyboard function, display function and mouse function
glutKeyboardFunc(handleKey);
glutDisplayFunc(RenderScene);
glutSpecialFunc(kfunc);
//use glblend to display the alpha range 0~255 only in this program
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glBlendEquation(GL_FUNC_ADD);
//define the drawing coordinate system on the viewport
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, w, 0, h);
// specify window clear (background) color to be opaque white
glClearColor(1, 1, 1, 1);
//glut loops
glutMainLoop();
return 0;
}
