computer-graphics-algorithms's Introduction

Computer Graphics Algorithms in java

This repository contains most of my lab works of Computer Graphics Course(CSE423). The codework can be found in the src directory

Dependencies:

The following jars are used in this codework and they are required:

jogl-all.jar
jogl-all-natives-{linux or windows}.jar
glugen-rt.jar
glugen-rt-natives-{linux or windows}.jar

Libraries are available at lib directory

How to use:

This repository is an IntelliJ IDEA project.
- Thus you can simply clone or download the repository and open with IntelliJ IDEA
You can use the code seperately from the source directory

License

MIT license

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computer-graphics-algorithms's Issues

Writing 8 different functions for the 8 octants

We can make use of symmetric property to find the points in all 8 octants. We can write a single function (finding points in 1st octant) and transform those points to fit into the respective octants

void drawLine0(int x0, int y0, int x1, int y1, int zone)
    {
        x0=abs(x0);
        y0=abs(y0);
        x1=abs(x1);
        y1=abs(y1);
        if(zone==1||zone==2||zone==5||zone==6)
        {
            swap(x0,y0);
            swap(x1,y1);
        }
        float dx = x1 - x0, dy = y1 - y0;
        float dE = dy;
        float dNE = (dy - dx);
        float d = (dy) - dx/2;
        float x = x0, y = y0;

        glPointSize(2.0f);
        glBegin(GL_POINTS);
        glVertex2f(x, y);

        while (x <= x1)
        {
            if (d < 0)
            {
                //we increment x in every iteration
                x++;
                //dnew = dold + dE
                d = d + dE;

            } else
            {
                x++;
                y++;
                d = d + dNE;
            }
            if(zone==0)
            glVertex2f(x, y);
            else if(zone==1)
            glVertex2f(y,x);
            else if(zone==2)
            glVertex2f(-1*y,x);
            else if(zone==3)
            glVertex2f(-1*x,y);
            else if(zone==4)
            glVertex2f(-1*x,-1*y);
            else if(zone==5)
            glVertex2f(-1*y,-1*x);
            else if(zone==6)
            glVertex2f(y,-1*x);
            else if(zone==7)
            glVertex2f(x,-1*y);
           
        }
        glEnd();

    }

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