Jump to content
  • Advertisement
Sign in to follow this  
bako

OpenGL Some question: moving object, draw a ball, bouncing ball

This topic is 3554 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi all. i've some trouble in opengl. 1) how i can automaticaly move a object? i.e. i would that my ball is moving into my window?. if i modify the value of the matrix using translatematix i didn't see anything because the display is done too fast. there is a method to move the object? 2) how i can draw a ball? i've seen the gluSphere, there's some problem using this function? i try this code, but dosen't work.
    private void drawBall(GL gl) {
        ArrayList etas = new ArrayList();
        ArrayList fis = new ArrayList();
        int mslice = 10;
        int nslice = 50;
        double eta;
        double fi;
        ArrayList<Vertex3d> vertex = new ArrayList<Vertex3d>();
        for (int i = 0; i < nslice - 1; i++) {
            eta = ((2 * Math.PI) / nslice) * i;
            etas.add(eta);
        }
        for (int j = 0; j < mslice; j++) {
            fi = -1 * (Math.PI / 2) + (Math.PI / mslice) * j;
            fis.add(fi);
        }
        for (int j = 0; j < fis.size(); j++) {
            for (int i = 0; i < etas.size(); i++) {
                eta = Double.valueOf("" + etas.get(i)).doubleValue();
                fi = Double.valueOf("" + fis.get(j)).doubleValue();
                Vertex3d v = new Vertex3d(Math.cos(eta) * Math.sin(fi), Math.sin(eta) * Math.sin(fi), Math.cos(fi));
                vertex.add(v);
            }
        }
        gl.glColor3f(1.0f, 0.0f, 0.0f);
        gl.glBegin(GL.GL_TRIANGLES);
        for (int i = 0; i < nslice; i++) {
            int j = 0;
            gl.glVertex3d(vertex.get(j).x, vertex.get(j).y, vertex.get(j).z);
            gl.glVertex3d(vertex.get(j + i + 1).x, vertex.get(j + i + 1).y, vertex.get(j + i + 1).z);
            gl.glVertex3d(vertex.get(j + i + 1 + 1).x, vertex.get(j + i + 1 + 1).y, vertex.get(j + i + 1 + 1).z);
            gl.glVertex3d(vertex.get(j).x, vertex.get(j).y, vertex.get(j).z);
            gl.glVertex3d(vertex.get(j + 1 + (nslice - 1)).x, vertex.get(j + 1 + (nslice - 1)).y, vertex.get(j + 1 + (nslice - 1)).z);
            gl.glVertex3d(vertex.get(j + 1).x, vertex.get(j + 1).y, vertex.get(j + 1).z);

        }
        gl.glEnd();
        gl.glColor3f(0.0f, 1.0f, 0.0f);
        gl.glBegin(GL.GL_QUADS);
        for (int i = 0; i < nslice - 1; i++) {
            for (int j = 1; j < mslice; j++) {
                gl.glVertex3d(vertex.get(j + i).x, vertex.get(j + i).y, vertex.get(j + i).z);
                gl.glVertex3d(vertex.get(j + i + 1).x, vertex.get(j + i + 1).y, vertex.get(j + i + 1).z);
                gl.glVertex3d(vertex.get(j + nslice + i + 1).x, vertex.get(j + nslice + i + 1).y, vertex.get(j + nslice + i + 1).z);
                gl.glVertex3d(vertex.get(j + nslice + i).x, vertex.get(j + nslice + i).y, vertex.get(j + nslice + i).z);
                gl.glVertex3d(vertex.get(j + (nslice - 1)).x, vertex.get(j + (nslice - 1)).y, vertex.get(j + (nslice - 1)).z);
                gl.glVertex3d(vertex.get(j + 0).x, vertex.get(j + 0).y, vertex.get(j + 0).z);
                gl.glVertex3d(vertex.get(j + nslice).x, vertex.get(j + nslice).y, vertex.get(j + nslice).z);
                gl.glVertex3d(vertex.get(j + nslice + (nslice - 1)).x, vertex.get(j + nslice + (nslice - 1)).y, vertex.get(j + nslice + (nslice - 1)).z);

            }
        }
        gl.glEnd();
    }
3) someone of you have code about bouncing ball (java preferd). thanks.

Share this post


Link to post
Share on other sites
Advertisement
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!