CG Lecture 18: Polygon filling Algorithms

 

DSIP lecture 16: Problem Solving on Types of Systems

 

DSIP Live lecture 15: Types of systems

 

CG Lecture 17

 

DSIP Live Lecture 13: Correlation

 

Computer Shape Drawing with C Programming

Computer  Shape Drawing with C Programming

In Following program Computer System Shape is drawn with the help of inbuilt functions available in graphics.h header file from C- language.

Program: 

#include<stdio.h>
#include<graphics.h>
#include<conio.h>
#include<dos.h>
void main()
{
 int gd=DETECT,gm,i;
 initgraph(&gd,&gm,"c:\\turboc3\\bgi");
  for(i=0;i<50;i++)
 {
 delay(100);

 //monitor Drawing
 rectangle(100,100,400,300);
 setcolor(5);
 rectangle(95,95,405,305);
 moveto(150,150);
 rectangle(230,305,260,400);
 floodfill(232,307,5);
 rectangle(180,400,310,450);
 floodfill(183,403,5);
 rectangle(182,402,308,448);

 //CPU Drawing
 setcolor(8);
 rectangle(500,100,600,450);
 rectangle(505,105,595,445);
 rectangle(520,120,540,200);
 rectangle(550,120,570,200);
 rectangle(510,210,580,400);
 floodfill(506,106,8);
 line(305,450,500,450);


//mouse drawing
setcolor(6);
ellipse(400,400,0,360,15,25);
line(385,390,415,390);
line(395,390,395,375);
line(405,390,405,375);
floodfill(400,400,6);
 setcolor(60-i);
 outtext("WELCOME TO PROGRAMMING");
 moveto(520,250);
 outtext("MYG");

 }
 getch();
}


Output: 

2D Transformations in Computer Graphics

        2D Transformations

     Definition: 2D Transformation modifies the coordinates of object to change the orientation, size or shape of the object.

    In 2D (2- Dimensional) transformation we are using two axes i.e.  X- axis and Y-axis to represent object. Any point on 2D plane is represented as A (x1, y1) where x1 is distance from origin on X-axis and y1 is distance from origin.as shown in figure below.

      Different 2D Transformations:

   a. Translation: Changing position of object from one place to other.

   b. Rotation: Angular displacement of object with some angle (ϴ)

   c. Scaling: Increasing or decreasing size of object.

   d. Reflection: Mirror image of the object.

   e. Shear: Deformation/Slanting in the shape of the object.

2D transformations can be broadly divided into Active and Passive type of Transformations.Those transformations are called active in which shape of object changed. In passive transformation shape of object will remain unchanged after operation.

Scaling and Shear are active 2D transformations while  Translation, Rotation and Reflection are passive 2D transformations.