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#ifndef BSLAYER_CPP_
#define BSLAYER_CPP_
#include <GL/gl.h>
#include <GL/glut.h>
#include <iostream>
#include<string>
#include<cmath> // for basic math functions such as cos, sin, sqrt
using namespace std;
//defining some MACROS
#define MAX(A,B) ((A) > (B) ? (A):(B)) // finds max of two numbers
#define MIN(A,B) ((A) < (B) ? (A):(B)) // find min of two numbers
#define ABS(A) ((A) < (0) ? -(A):(A)) // find ABS of a given number
// define some constants
// constant FPS (Frame per second) is used to specify
// number of frames per second in your game.. if FPS is small
// your objects will move slowly and if large your objects
// will move faster, see the Timer function below for further help
#define FPS 80 // frame per seconds
// define another constant to hold ASCII for Escape key.
#define KEY_ESC 27 // A
// define some colors as 2D arrays, we have five pre-defined colors here..
// you can add many more if you wish..
float colors[5][3] = { { 1 / 255.0, 164 / 255.0, 164 / 255.0 }, { 215 / 255.0, 0
/ 255.0, 96 / 255.0 }, { 208 / 255.0, 209 / 255.0, 2 / 255.0 }, { 0
/ 255.0, 161 / 255.0, 203 / 255.0 }, { 50 / 255.0, 116 / 255.0, 44
/ 255.0 } };
// defining some utility functions...
/*
* This function converts an input angle from degree to radians */
float Deg2rad(float degree) {
return (degree / 180.0) * M_PI;
}
// seed the random numbers generator by current time (see the documentation of srand for further help)...
void InitRandomizer() {
srand((unsigned int) time(0)); // time(0) returns number of seconds elapsed since January 1, 1970.
}
//This function returns a random value within the specified range of [rmin, rmax] ...
long GetRandInRange(const long &rmin, const long &rmax) {
long range = rmax - rmin; // find the range
long value = (rand() % (long) range) + rmin; // translate the generated number ...
// cout << value << endl << flush;
return value;
}
/*To draw a triangle we need three vertices with each vertex having 2-coordinates [x, y] and a color for the triangle.
* This function takes 4 arguments first three arguments (3 vertices + 1 color) to
* draw the triangle with the given color.
* */
void DrawTriangle(int x1, int y1, int x2, int y2, int x3, int y3,
float color[]) {
glColor3fv(color); // Set the triangle colour
// ask library to draw triangle at given position...
glBegin(GL_TRIANGLES);
/*Draw triangle using given three vertices...*/
glVertex4i(x1, y1, 0, 1);
glVertex4i(x2, y2, 0, 1);
glVertex4i(x3, y3, 0, 1);
glEnd();
}
/*
* Write two functions DrawRectangle and DrawSphere
* */
/*
* Main Canvas drawing function.
* */
void Display()/**/{
// set the background color using function glClearColor.
// to change the background play with the red, green and blue values below.
// Note that r, g and b values must be in the range [0,1] where 0 means dim rid and 1 means pure red and so on.
glClearColor(1/*Red Component*/, 1.0/*Green Component*/,
1.0/*Blue Component*/, 0 /*Alpha component*/); // Red==Green==Blue==1 --> White Colour
glClear(GL_COLOR_BUFFER_BIT); //Update the colors
//write your drawing commands here or call your drawing functions...
// Drawing set of three triangles at different points of a circle using simple trignometry...
int i=150;
int u=839;
int a=1;
while(u>360)
{
if(a==1) // to insert colour
a=2;
else if(a==2)
a=1;
while(i<800) //to draw the bricks
{
DrawTriangle(i, u, i, u-29, i+70, u, colors[a]);
DrawTriangle(i+70, u, i, u-29, i+70, u-29, colors[a]);
i=i+71;
}
i=150;
u=u-31;
}
//to draw a ball
int midx = 110;
int midy = 50;
//for ( float theta = Deg2rad(100); theta != 360 ; theta++ )
float theta = Deg2rad(10);
float theta2 = Deg2rad(30);
while ( theta <=13720 )
{
DrawTriangle(midx, midy, midx + 10 * cos(theta),
midy + 10* sin(theta), midx + 10 * cos(theta2),
midy + 10 * sin(theta2), colors[1]);
theta=theta+10;
theta2=theta2+10;
}
DrawTriangle(30, 15, 30, 5, 120, 15, colors[1]);
DrawTriangle(120, 15, 30, 5, 120, 5, colors[1]);
//
glutSwapBuffers(); // do not modify this line..
}
/* Function sets canvas size (drawing area) in pixels...
* that is what dimensions (x and y) your game will have
* Note that the bottom-left coordinate has value (0,0) and top-right coordinate has value (width-1,height-1)
* */
void SetCanvasSize(int width, int height) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, 0, height, -1, 1); // set the screen size to given width and height.
}
/*This function is called (automatically) whenever any non-printable key (such as up-arrow, down-arraw)
* is pressed from the keyboard
*
* You will have to add the necessary code here when the arrow keys are pressed or any other key is pressed...
*
* This function has three argument variable key contains the ASCII of the key pressed, while x and y tells the
* program coordinates of mouse pointer when key was pressed.
*
* */
void NonPrintableKeys(int key, int x, int y) {
if (key == GLUT_KEY_LEFT /*GLUT_KEY_LEFT is constant and contains ASCII for left arrow key*/) {
// what to do when left key is pressed...
} else if (key == GLUT_KEY_RIGHT /*GLUT_KEY_RIGHT is constant and contains ASCII for right arrow key*/) {
} else if (key == GLUT_KEY_UP/*GLUT_KEY_UP is constant and contains ASCII for up arrow key*/) {
}
else if (key == GLUT_KEY_DOWN/*GLUT_KEY_DOWN is constant and contains ASCII for down arrow key*/) {
}
/* This function calls the Display function to redo the drawing. Whenever you need to redraw just call
* this function*/
/*
glutPostRedisplay();
*/
}
/*This function is called (automatically) whenever any printable key (such as x,b, enter, etc.)
* is pressed from the keyboard
* This function has three argument variable key contains the ASCII of the key pressed, while x and y tells the
* program coordinates of mouse pointer when key was pressed.
* */
void PrintableKeys(unsigned char key, int x, int y) {
if (key == KEY_ESC/* Escape key ASCII*/) {
exit(1); // exit the program when escape key is pressed.
}
}
/*
* This function is called after every 1000.0/FPS milliseconds
* (FPS is defined on in the beginning).
* You can use this function to animate objects and control the
* speed of different moving objects by varying the constant FPS.
*
* */
void Timer(int m) {
// implement your functionality here
// once again we tell the library to call our Timer function after next 1000/FPS
glutTimerFunc(1000.0 / FPS, Timer, 0);
}
/*
* our gateway main function
* */
int main(int argc, char*argv[]) {
int width = 1000, height = 900; // i have set my window size to be 800 x 600
InitRandomizer(); // seed the random number generator...
glutInit(&argc, argv); // initialize the graphics library...
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA); // we will be using color display mode
glutInitWindowPosition(50, 50); // set the initial position of our window
glutInitWindowSize(width, height); // set the size of our window
glutCreateWindow("ITCs Brick Slayer"); // set the title of our game window
SetCanvasSize(width, height); // set the number of pixels...
// Register your functions to the library,
// you are telling the library names of function to call for different tasks.
glutDisplayFunc(Display); // tell library which function to call for drawing Canvas.
glutSpecialFunc(NonPrintableKeys); // tell library which function to call for non-printable ASCII characters
glutKeyboardFunc(PrintableKeys); // tell library which function to call for printable ASCII characters
// This function tells the library to call our Timer function after 1000.0/FPS milliseconds...
glutTimerFunc(1000.0 / FPS, Timer, 0);
// now handle the control to library and it will call our registered functions when
// it deems necessary...
glutMainLoop();
return 1;
}
#endif /* BSLAYER_CPP_ */
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