Programming Forums - Help with an openGL program

Ok so basically I've got an openGL program and currently I am having two problems. My first problem I am having is trying to make an array of references of a method that will draw a quads. The draw method to draw the quad is my Building.h header file and in my main.cpp I have a drawing function which repeatidly gets called and this is where I called my drawquad method. I have made an instance of the Building class called Building b;

Building bvoid DrawScene(void)



{

                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // draws Building

        b.drawBuilding();

                glEnd();

                glutSwapBuffers();

}

;

My drawing code works but I am trying to draw multiple buildings and want to make multiple instances of the building class. I have done this before in C# but am unsure of how to do it in C++. I tried doing:

 Building b[6]; 



void DrawScene(void)

{

                for(int i = 0; i < 6; i++)

                {

                        b[i] = new Building;

                }

                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // draws Building

        b.drawBuilding();

                glEnd();

                glutSwapBuffers();

}

something to that affect and then scale up the x factors but I am not sure how to accomplish this. Another problem I am having is I am making a random number generator which generates a random height for the y values in the quad.

srand((unsigned)time(0));

const double Random_Height = (rand()%400)+50;

glVertex2d(x + 0, y + Random_Height);

glVertex2d(x + 75, y + Random_Height);

but the problem is when I call my drawQuad method inside my draw function which repeatidly gets called, the drawQuad method continues to generate a random number and a random height and my quad grows and shrinks because the method is repeatidly called generating a new random number everytime. Any suggestions on how to fix these problems??

Quote:

A Thousand years from now, computer scientists will look at my code and laugh :rolleyes: