#include <gl/glut.h>
int balld1=0;//0 if the ball is going left, 1 if it's heading right
int balld2=0;//0 if it's going up, 1 if it's going down
float ballx;//the balls current and old x position
float bally;//the balls current and old y position
float paddlex;//well you get the idea..
float paddley;
float paddle2x;
float paddle2y;
void key();
void draw();
int main(int argc, char** argv){
paddlex=0.75;//default values for the paddle's positions
paddley=0.0;
paddle2x=-0.75;
paddle2y=0.0;
ballx=-0.10;
bally=0;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA);
glutInitWindowSize(300, 300);
glutInitWindowPosition(100, 100);
glutCreateWindow("Ill Pong");
glClearColor(0.0, 0.0, 0.0, 0.0);
glutDisplayFunc(draw);
//glutKeyboardFunc(key); //haven't made this function yet..
glutMainLoop();
return 0;
}
void draw(){
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);//the right paddle
glVertex2f(paddlex, paddley);//bottom left corner
glVertex2f(paddlex+0.10, paddley);//bottom right corner
glVertex2f(paddlex+0.10, paddley+0.50);//top right corner
glVertex2f(paddlex, paddley+0.50);//top left corner
glEnd();
glBegin(GL_QUADS);//the left paddle
glVertex2f(paddle2x, paddle2y);//bottom left corner
glVertex2f(paddle2x-0.10, paddle2y);//bottom right corner
glVertex2f(paddle2x-0.10, paddle2y-0.50);//top right corner
glVertex2f(paddle2x, paddle2y-0.50);//top left corner
glEnd();
if(balld1==0 && balld2 == 0){ballx=ballx-0.1;bally=bally+0.2;}//makes the ball go up and left
glBegin(GL_QUADS);//the ball
glVertex2f(ballx, bally);//bottom left corner
glVertex2f(ballx+0.10, bally);// bottom right corner
glVertex2f(ballx+0.10, bally+0.10);//top right corner
glVertex2f(ballx, bally+0.10);//top left corner
glEnd();
glFlush();
}first game.. pong
Author
well i just started on this a while ago, and it's my first attempt and making an actual game... so far it's doing fine, but the ball dosent move as i've programmed it to.. i though about using a loop to make it move, but then i would have no keyboard input and a ball that just moves accross the screen forever, here is the code i've written so far.. i've commented it as much as possible since i ussualy think a little wierd when coming up with things... well here it is.. i really cant figure out how to make that ball move..
I'm not sure how you can fix it, but by adding this code:
static int Count = 0;
++Count;
char* Buffer = new char[512];
sprintf(Buffer,"%d\n",Count);
OutputDebugString(Buffer);
to the end of draw function I could see that it's only called once, I don't know glut or opengl so can't help you with why it is only called one time. One time I noticed though is that if I but a breakpoint in the draw function and just hit continue everytime it will be executed as many time as I press continue.
EDIT: I don't know if you are running Linux, but on Windows OutputDebugString writes the string to the debugger.
static int Count = 0;
++Count;
char* Buffer = new char[512];
sprintf(Buffer,"%d\n",Count);
OutputDebugString(Buffer);
to the end of draw function I could see that it's only called once, I don't know glut or opengl so can't help you with why it is only called one time. One time I noticed though is that if I but a breakpoint in the draw function and just hit continue everytime it will be executed as many time as I press continue.
EDIT: I don't know if you are running Linux, but on Windows OutputDebugString writes the string to the debugger.
Author
alright, i found out about a function called postredisplay which redraws the screen.. it works now but the ball flies off the screen too fast to see it.. but i'll change that soon.. thanks for the help.
illmaster
illmaster
Author
alright, after a few hours and this whole morning, i am done.. EXCEPT... player one always wins and the ball is too fast.. so fast that is actually seems to just.. disappear to thin air... i dont know why player one allways wins, and i dont have any clue how to slow down the ball.. heres the code... any help is much appreciated..
#include <gl/glut.h>#include <stdio.h>int score1=0, score2=0;//current scoresint balld1=0;//0 if the ball is going left, 1 if it's heading rightint balld2=0;//0 if it's going up, 1 if it's going downfloat ballx;//the balls current and old x positionfloat bally;//the balls current and old y positionfloat paddlex;//well you get the idea..float paddley;float paddle2x;float paddle2y;void control(unsigned char key, int x, int y);void draw();int main(int argc, char** argv){ paddlex=0.75;//default values for the paddle's positions paddley=0.0; paddle2x=-0.75; paddle2y=0.0; ballx=-0.10; bally=0; glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE); glutInitWindowSize(300, 300); glutInitWindowPosition(100, 100); glutCreateWindow("Ill Pong"); glClearColor(0.0, 0.0, 0.0, 0.0); glutDisplayFunc(draw); glutKeyboardFunc(control); //handles keypresses glutMainLoop(); return 0; }void draw(){ glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glBegin(GL_QUADS);//the right paddle glVertex2f(paddlex, paddley);//bottom left corner glVertex2f(paddlex+0.10, paddley);//bottom right corner glVertex2f(paddlex+0.10, paddley+0.50);//top right corner glVertex2f(paddlex, paddley+0.50);//top left corner glEnd(); glBegin(GL_QUADS);//the left paddle glVertex2f(paddle2x, paddle2y);//bottom left corner glVertex2f(paddle2x-0.10, paddle2y);//bottom right corner glVertex2f(paddle2x-0.10, paddle2y-0.50);//top right corner glVertex2f(paddle2x, paddle2y-0.50);//top left corner glEnd(); if(balld1==0 && balld2==0){ballx=ballx-0.1;bally=bally+0.2;}//makes the ball go left and up if(balld1==0 && balld2==1){ballx=ballx-0.1;bally=bally-0.2;}//makes the ball go left and down if(balld1==1 && balld2==0){ballx=ballx+0.1;bally=bally+0.2;}//makes the ball go right and up if(balld1==1 && balld2==1){ballx=ballx+0.1;bally=bally-0.2;}//makes the ball go right and down if(ballx>1 && balld2==1){score2++;balld1=0; balld2=0;}//these four handle the scores and turns the ball if(ballx>1 && balld2==0){score2++;balld1=0; balld2=1;} if(ballx>-1 && balld2==1){score1++;balld1=1; balld2=0;} if(ballx>-1 && balld2==0){score1++;balld1=1; balld2=1;} if(bally>0.50 || bally>1.0)balld2=1;//sends the ball down if it hits the top if(bally<-0.50 || bally<-1.0)balld2=0;//sends the ball up if it hits the bottom if(ballx==paddlex && bally>=paddley && bally<=paddley && balld2==0){balld1=0;balld2=1;}//sends the ball left and down if(ballx==paddlex && bally>=paddley && bally<=paddley && balld2==1){balld1=0;balld2=0;}//sends the ball left and up if(ballx==paddle2x && bally>=paddle2y && bally<=paddle2y && balld2==0){balld1=1;balld2=1;}//sends the ball right and down if(ballx==paddle2x && bally>=paddle2y && bally<=paddle2y && balld2==1){balld1=1;balld2=0;}//sends the ball right and up if(paddley>0.50)paddley=paddley-0.10;//these four handle the collision with the paddle and the walls if(paddley<-1.0)paddley=paddley+0.10; if(paddle2y>1.0)paddle2y=paddle2y-0.10; if(paddle2y<-0.50)paddle2y=paddle2y+0.10; glBegin(GL_QUADS);//the ball glVertex2f(ballx, bally);//bottom left corner glVertex2f(ballx+0.10, bally);// bottom right corner glVertex2f(ballx+0.10, bally+0.10);//top right corner glVertex2f(ballx, bally+0.10);//top left corner glEnd(); glFlush(); //if(score1>5)MessageBox(NULL, "Player one wins!", "Winner", MB_ICONINFORMATION|MB_OK); //if(score2>5)MessageBox(NULL, "Player two wins!", "Winner", MB_ICONINFORMATION|MB_OK); glutSwapBuffers(); glutPostRedisplay(); }void control(unsigned char key, int x, int y){//player controls switch(key){ case 'k': paddley=paddley+0.2; break; case 'm': paddley=paddley-0.2; break; case 'w': paddle2y=paddle2y+0.2; break; case 's': paddle2y=paddle2y-0.2; break; } }
Well, instead of having so many different if statements in your code you could use a switch to change the balls directions. As such.....
I hope you get the idea from that. To slow it down I guess you could limit the frames with a time cap. I learned this a few days ago right from here at GameDev.
That should make it stay at 60 Frames per Second. Hope that helps....
#define UP_RIGHT 0#define UP_LEFT 1#define DOWN_RIGHT 2#define DOWN_LEFT 3int balld; //to hold the balls current directionint CCBallD() { //Check and Change the balls direction accordingly balld = DOWN_LEFT; switch(balld) { case DOWN_LEFT: //your code hereI hope you get the idea from that. To slow it down I guess you could limit the frames with a time cap. I learned this a few days ago right from here at GameDev.
#define FPS 60int tint tick() { t++; return t;}void render() { int starttime = tick(); //draw your stuff to the screen once int nexttime = starttime + 1000/FPS; if(nexttime > tick()) { //draw your stuff to the screen nexttime += 1000/FPS; }}That should make it stay at 60 Frames per Second. Hope that helps....
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