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Second Assignment DDA algorithm for line drawing using Mouse

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Draw the polygons by using the mouse. Choose colors by clicking on the designed color pane. Use window port to draw. (Use DDA algorithm for line drawing) #include<string.h> #include<GL/glut.h> #define ROUND(x)((int)(x+0.5)) struct Point { GLint x; GLint y; }; struct Color { GLfloat r; GLfloat g; GLfloat b; }; Color getPixelColor(GLint x, GLint y)  //Fun for getting color of pixel {  Color color; glReadPixels(x,y,1,1,GL_RGB, GL_FLOAT, &color); return color; } void setPixelColor(GLint x, GLint y, Color color)   //set color of pixel {    glColor3f(color.r, color.g, color.b); glBegin(GL_POINTS); glVertex2i(x,y); glEnd(); glFlush(); } void floodFill(GLint x, GLint y, Color oldColor, Color newColor)//seed fill algorithm { Color color; color= getPixelColor(x,y); if(color.r == oldColor.r && color.g == oldColor.g && color.b == oldColor.b) { setPixelColor(x,y, newColor); floodFill(x+1,y, oldColor, newColor); floodFill(x,y+1, oldCol...
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C program for Bresenham algorithm for Circle

C program for Bresenham algorithm for Circle #include <stdio.h> //#include <math.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> // Center of the cicle = (320, 240) int xc = 320, yc = 240; // Plot eight points using circle's symmetrical property void plot_point(int x, int y) {   glBegin(GL_POINTS);   glVertex2i(xc+x, yc+y);   glVertex2i(xc+x, yc-y);   glVertex2i(xc+y, yc+x);   glVertex2i(xc+y, yc-x);   glVertex2i(xc-x, yc-y);   glVertex2i(xc-y, yc-x);   glVertex2i(xc-x, yc+y);   glVertex2i(xc-y, yc+x);   glEnd(); } // Function to draw a circle using bresenham's // circle drawing algorithm void bresenham_circle(int r) {   int x=0,y=r;   float s=3-(2*r);   /* Plot the points */   /* Plot the first point */   plot_point(x,y);   int k;   /* Find all vertices till x=y */   while(x <= y)   {     //x = x + 1;     //s...
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SPPU computer graphics Laboratory Syllabus

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Bresenham Line drawing C program with output

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Bresenham line drawing program   #include<stdio.h> #include<GL/glut.h> #define sign(x) ((x>0)?1:(x<0)?-1:0); void setPixel(GLint x, GLint y) {  glBegin(GL_POINTS); //The basic shapes are referred to as primitives.and glbegin is used to delimit these primitives   // GL_POINTS is an argument of glBegin which consider each vertex as a single points  glVertex2i(x,y);    /* Plot the first point *///it is use to specify vertex  glEnd(); } void init() {  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); //single buffer window  glutInitWindowPosition(0,0);  glutInitWindowSize(0,0);  glutCreateWindow("My Window");  glClearColor(0.0,0.0,0.0,0.0); /* Set clear color to black */  glColor3f(1.0,1.0,1.0);     /* Set fill color to white */ //used to specify color & 3f stand for float red , green, blue  gluOrtho2D(0,640,0,480);    //multiply the current matrix with an...
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Bresenham Algorithm for line drawing

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DDA Algorithm

#include <stdio.h> #include <math.h> #include <GL/glut.h> //#include <GL/glu.h> //#include <GL/gl.h> double X1, Y1, X2, Y2; float round_value(float v) {   floor(v + 0.5);// This function is used to roundup the values   return v; } void LineDDA(void) {   double dx=(X2-X1);   double dy=(Y2-Y1);   double steps;   float xInc,yInc,x=X1,y=Y1;   /* Find out whether to increment x or y */   //steps=(abs(dx)>abs(dy))?(abs(dx)):(abs(dy));   if(abs(dx)>abs(dy))   steps=abs(dx);   else   steps=abs(dy);   xInc=dx/(float)steps;   yInc=dy/(float)steps;   /* Clears buffers to preset values */   glClear(GL_COLOR_BUFFER_BIT);//glClear is predefine function used to clear buffer and                   //GL_COLOR_BUFFER_BIT Indicates the buffers currently enabled for color writing.         ...
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Installation steps for openGL on ubuntu

 GLUT it is open GL_U tility _T oolkit for openGL programming we need to install glut (pronounce as glat). Following are the steps to install GLUT on Ubuntu operating system. Step 1: sudo apt-get update               For updation of basic packages Step 2: sudo apt-get install build-essential               For installing essential packages. Step 3: sudo apt-get install freeglut3 freeglut3-dev               // its GL utility toolkit Step 4: sudo apt-get install binutils-gold             It is GNU gold linker utility.  Gold is a new linker, which is faster than the current linker included in binutils Step 5: sudo apt-get install g++ cmake         its a  Command-Line Reference.Users build a project b...
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