OpenGL Translation - Coordinate - opengl

Question

I'm attempting to make a simple game that allows you to jump around the screen and onto the platforms without leaving the screen or falling through the platforms.
So far i have managed to create a little 2D square which i refer to as my sprite or character along with 2 platforms.
I have finally made my sprite move up, down, left and right (no jump yet) but my collision for leaving the screen isn't working how i thought it would...
What i'm doing is using glTranslate(x,y,z) to move my sprite depending on the key input from the keyboard and testing a collision between the sprite and the screen before. Unfortunately i think im getting confused with the coordinates being used for the translation inside my collisionScreen.
Something to note is, i can not take my sprite past the origin of where the sprite was initially drawn ie "0" no matter where or when the sprite is drawn.

Answer 1

It seems that:
void collisionScreen (int x, int y)
{
//stops sprite leaving current screen size
if(x_pos < 0 || x_pos+s1_W > winX)
x_pos -= x_pos;
if(y_pos < 0 || y_pos+s1_H > winY)
y_pos -= y_pos;
}
doesn't actually use the x and y parameters you pass into it.
Perhaps you meant something like this:
void collisionScreen (int x, int y)
{
//stops sprite leaving current screen size
if(x_pos < 0)
x_pos = 0;
else if(x_pos+s1_W > winX)
x_pos = winX - s1_W;
if(y_pos < 0)
y_pos = 0;
else if(y_pos+s1_H > winY)
y_pos = winY - s1_H;
}
Also, your sprite will not pass 0 as that is what this method is designed to do.