Dino

dino.cpp

#include <windows.h>
#include <GL/glut.h>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
const string FILE_NAME = "dinosaur.dat";
class Piece
{
public:
	Piece();

	void setPiece(int nop);
	int numOfPoints;
	float *x;
	float *y;
};
Piece::Piece()
{
	this->numOfPoints = 0;
}
void Piece::setPiece(int nop)
{
	numOfPoints = nop;
	this->x = new float[numOfPoints];
	this->y = new float[numOfPoints];
}
class FileHelper
{
public:
	void ReadData(string, Piece *&pieces, int &numOfPieces);
};
void FileHelper::ReadData(string fileName, Piece *&pieces, int &numOfPieces)
{
	ifstream inStream;
	inStream.open(fileName.c_str());

	if (!inStream)
	{
		cout << "Can not open this file" << endl;
	}
	else
	{
		// read data from file to array "pieces"
		inStream >> numOfPieces;
		pieces = new Piece[numOfPieces];
		for (int i = 0; i < numOfPieces; i++)
		{
			int nop;
			inStream >> nop;
			pieces[i] = Piece();
			pieces[i].setPiece(nop);
			for (int j = 0; j < nop; j++)
			{
				inStream >> pieces[i].x[j] >> pieces[i].y[j];
			}
		}
	}
	inStream.close();
}

Piece *pieces;
int numOfPieces = 0;
// Use FileHelper to open and read the data file
void readData()
{
	FileHelper fileHelper;
	fileHelper.ReadData(FILE_NAME, pieces, numOfPieces);
}
void init()
{
	glClearColor(1, 1, 1, 0);
	glColor3f(0, 0, 0);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-800, 800, -200, 800, -1, 1);
}
void display()
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	// draw the left dinosaur
	glColor3f(0.5, 0.5, 0.5);
	for (int i = 0; i < numOfPieces; i++)
	{
		glBegin(GL_LINE_STRIP);
		for (int j = 0; j < pieces[i].numOfPoints; j++)
		{
			glVertex2f(pieces[i].x[j], pieces[i].y[j]);
		}
		glEnd();
	}
	// draw the right dinosaur
		for (int i = 0; i < numOfPieces; i++)
	{
		glBegin(GL_LINE_STRIP);
		for (int j = 0; j < pieces[i].numOfPoints; j++)
		{
			glVertex2f(-pieces[i].x[j], pieces[i].y[j]);
		}
		glEnd();
	}
	glFlush();
	glutSwapBuffers();
}
int main(int argc, char *argv[])
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(500, 300);
	glutInitWindowPosition(100, 0);
	glutCreateWindow("Lab_05");
	init();
	// read the data from dinosaur.dat
	readData();

	glutDisplayFunc(display);
	glutMainLoop();
}