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Read about DDA (Digital differential analyzer) algorithm . You can find line drawing using bresenham's line algorithm here . Java Code for DDA line drawing algorithm. :- package applet; import java.applet.Applet; import java.awt.Button; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; public class dda extends Applet implements MouseListener, MouseMotionListener, ActionListener {     int x1 = -1, y1 = -1, x2 = -1, y2 = -1,     //coordinates of start and end points             pixelsize = 12,                     //size of pixel in raster             xa = 0, xfin = 0, yfin = 0,         //increment and end po...

   My friend Sandip is doing M.Tech from one of the reputed college. His lecturer asked him to do Java code for line drawing using Bresenham s , DDA algorithm. So I am posting this blog for  Bresenham line drawing algorithm in java and you can find line drawing using DDA algorithm  here . Read more about Bresenham's line algorithm  . Java code :-  package applet; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; public class bresenhamLine extends java.applet.Applet implements MouseListener, MouseMotionListener { private static final long serialVersionUID = 1L; int width, height; int x1 = 0, y1 = 0, x2 = 0, y2 = 0, pixelsize = 2; public void init() {      width = getSize().width;      height = getSize().height;      this.addMous...