object is not showing properly when i move it n also hangs my IDE

Question

0.00/5 (No votes)

See more:

im moving an object on screen using arrow keys but it is not moving instantly, it moves after some time n also hangs my netbeans, plz see whts problem in it.

i m not pasting my huge code here, i m writing in words or some exact code so tht whoever wants to answer can understand the question easily
display()
{
.....
case startGame:

C#

glClearColor(1.0,1.0,1.0,0);
glClear(GL_COLOR_BUFFER_BIT);

print background
forloop
{ print maze's one box at a time n also apply texture}

C#

Object(objectx,objecty);
glutSwapBuffers();
break;

}
objects x and y is changing using glutSpecialFunc(mySpecialKeyFn);

i think each time i press an arrow key, it has to print lot of things thts why it moves slow n hang, am i right?

updated after recieving answer
i got a problem in the implementation of displayLIsts. this is my code of display() for which i made a displaylist but the problem is tht it apply texture to every box :(

C#

void generateDisplayList()
{
    index = glGenLists(1);
    glNewList(index, GL_COMPILE);
    int x = startx, y= starty;
    for(int i =0;i<mazeHeight;i++)
    {
        for(int j=0;j<mazeWidth;j++)
        {
            if(mazeArray[i][j]==1 ||mazeArray[i][j]==2)
            {
                if(i==0&& j==startpty)
                {
                    glColor3f(1,0,0);
                    objectx=x+25;
                    objecty=y-25;
                }
                else if(i==mazeHeight-1&&j==endpty)
                    glColor3f(1,0,0);
                else
                    glColor3f(201/255.0,228/255.0,228/255.0);
                        glBegin(GL_QUADS);
                        glVertex2f(x,y);
                        glVertex2f(x+size,y);
                        glVertex2f(x+size,y-size);
                        glVertex2f(x,y-size);
                        glEnd();
              }
              else
              {
                        glColor3f(1,1,1);
                        img[4].setTexture(2);
                        glEnable(GL_TEXTURE_2D);
                        glBindTexture(GL_TEXTURE_2D,2);
                        glBegin(GL_QUADS);
                        glTexCoord2f(0.0,0.0);
                        glVertex2f(x,y);
                        glTexCoord2f(1.0,0);
                        glVertex2f(x+size,y);
                        glTexCoord2f(1.0,1.0);
                        glVertex2f(x+size,y-size);
                        glTexCoord2f(0,1.0);
                        glVertex2f(x,y-size);
                        glEnd();
                }
                x+= size;
         }
                y-=size;
                x=startx;
      }
      glEndList();

}

i call this fn in main and glCallList(index); in display()

Posted 1-Oct-11 9:46am

Sweety Khan

Updated 1-Oct-11 19:40pm

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

enhzflep · Answer 1 · 2011-10-01T12:08:00

The response time should be 1/frameRate seconds. I.e if you're throwing 500 frames a second onto the screen, you should be able to handle 500 moves per second - 0.002s response time.

If your response time is so slow as to be noticeable, I'm more than willing to bet that the whole draw-loop is equally slow (and in fact, the source of the problem)
Different optimizations are available to the programmer, based on the version of OpenGL being targeted. As a very simple and basic optimization, are you for example, using DisplayLists or the somewhat more exotic Vertex Buffer Objects?

I also will point out that I read earlier this week that in a typical frame of Quake2, there are often only some 600 - 700 polygons visible on the screen at any one time. The engine is sophisticated enough that it sorts through the 1000s/100,000s/1,000,000s of polygons and only sends the ones which will be visible to the OpenGL pipeline. This saves tremendously on the effort wasted by painting any particular pixel over and over again with each successively closer object in the Z plane.