8 Aug 2012 | C - Programming Guide

c program for graphics editor

Posted on Wednesday 8 August 2012 by Abc

C - Program for Graphics Editor

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Title: assignment to understand functions available in graphics liabrary such as,

1. Text & graphics mode,initialization of graphics mode, graphics drivers, switching between text & graphics mode,error handling.

2. Colour,colour palette,aspect ratio,text:fonts,alignments,size,orientation &justification.

3. Graphics primitives: pixel,line,circle,ellipse,polygons,line styles,bar graphs,pie charts,histogram,filling a polygon, windowing.

4. Writing a graphics editor.

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#include <graphics.h>

#include <stdlib.h>

#include <stdio.h> //include header file

#include <conio.h>

#include<iostream.h>

class graph_edit //class declraration

{

int x1,y1,x,y;

public:

void drawcircal();

void drawline();

void drawellips();

void draw_poly();

void fill_poly();

void barchar();

void piechart();

void pixel();

void text();

graph_edit();

};

graph_edit::graph_edit() //constructor declaration

{

x1=y1=0;

}

void graph_edit::piechart() //function for piechart

{

x=getmaxx()/2;

y=getmaxy()/2;

setfillstyle(SOLID_FILL, 5);

pieslice(x,y,0,60,150);

setfillstyle(SOLID_FILL, 10);

pieslice(x,y,61,180,150);

setfillstyle(SOLID_FILL, 12);

pieslice(x,y,181,360,150);

}

void graph_edit::barchar() //function for barchart

{

x=getmaxx();

y=getmaxy();

setfillstyle(BKSLASH_FILL, getmaxcolor());

line(50,20,50,y-20);

line(20,y-50,x-20,y-50);

bar(100,y-50,x-500,200);

bar(200,y-50,x-400,150);

bar(300,y-50,x-300,250);

bar(400,y-50,x-200,350);

outtextxy(40,22,"Y");

outtextxy(x-30,y-40,"x");

outtextxy(10,y-30,"(0,0)");

}

void graph_edit::drawcircal() //function for circal

{

int rad;

x=getmaxx()/2;

y=getmaxy()/2;

cout<<"\nEnter the radius";

cin>>rad;

setcolor(getmaxcolor());

clrscr();

circle(x,y,rad);

}

void graph_edit::draw_poly() //function for polygon

{

int poly[15];

x=getmaxx();

y=getmaxy();

poly[0] = 20;

poly[1] = x/2;

poly[2] = x-20;

poly[3] = 20;

poly[4] = x-50;

poly[5] = y-20;

poly[6] = x/2;

poly[7] = y/2;

poly[8] = poly[0];

poly[9] = poly[1];

clrscr();

drawpoly(5, poly);

}

void graph_edit::text() //function for textstyle

{

char str[20];

int si;

y=getmaxy()/2;

cout<<"\nEnter the size of Text:";

cin>>si;

settextstyle(SANS_SERIF_FONT,HORIZ_DIR, si);

sprintf(str,"Graphics");

clrscr();

outtextxy(0,y,str);

}

void graph_edit::fill_poly() //function for fillpolygon

{

int poly[15];

x=getmaxx();

y=getmaxy();

poly[0] = 20;

poly[1] = x/2;

poly[2] = x-20;

poly[3] = 20;

poly[4] = x-50;

poly[5] = y-20;

poly[6] = x/2;

poly[7] = y/2;

poly[8] = poly[0];

poly[9] = poly[1];

clrscr();

drawpoly(5, poly);

setfillstyle(SLASH_FILL,12);

fillpoly(5,poly);

getch();

}

void graph_edit::drawellips() //function for ellips

{

int angle_s,angle_e,x_rad,y_rad;

angle_s=0;

angle_e=360;

x=getmaxx()/2;

y=getmaxy()/2;

cout<<"\n Enter x and y radius:";

cin>>x_rad>>y_rad;

clrscr();

ellipse(x,y,angle_s,angle_e,x_rad,y_rad);

cout<<x1;

}

void graph_edit::pixel() //function for draw pixel

{

int x,y;

cout<<" Enter X and Y Position";

cin>>x>>y;

putpixel(x,y,10);

}

void graph_edit::drawline() //function for draw line

{

int x2,y2;

cout<<"Enter starting point (x1,y1)";

cin>>x1>>y1;

cout<<"Enter ending point (x2,y2)";

cin>>x2>>y2;

clrscr();

line(x1,y1,x2,y2);

}

int main(void) //main function declaration

{

graph_edit g;

int ch; //initialize graphic mode

int gdriver = DETECT, gmode, errorcode;

initgraph(&gdriver, &gmode, "c:\\tc\\bgi");

errorcode = graphresult();

if(errorcode != grOk)

{

printf("Graphics error: %s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1);

}

do //display menu

{

cout<<"\n\n\t\tMENU";

cout<<"\n\n\t1:Circle\n\t2:Line\n\t3:ellips";

cout<<"\n\t4:polygon\t\n\t5:FillPolygon\n\t6:Text";

cout<<"\n\t7:Pixel\n\t8:Barchart\n\t9:Pie Chart\n\t10:Exit";

cout<<"\n\nEnter your choice:";

cin>>ch;

switch(ch)

{

case 1: g.drawcircal();

getch(); //case for circal drawing

cleardevice();

break;

case 2: g.drawline();

cleardevice(); //case for line drawing

getch();

break;

case 3: g.drawellips();

getch(); //case for ellips drawing

cleardevice();

break;

case 4: g.draw_poly();

getch(); //case for polygon drawing

cleardevice();

break;

case 5: g.fill_poly();

cleardevice(); //case for polygon filling

getch();

break;

case 6: g.text();

getch(); //case for text style

cleardevice();

break;

case 7: cleardevice();

g.pixel(); //case for pixel drawing

getch();

break;

case 8: cleardevice();

g.barchar(); //case for barchart

getch();

break;

case 9: cleardevice();

g.piechart(); //case for barchart

getch();

case 10:exit(0);

getch();

}

cleardevice();

}while(ch!=10);

getch(); //closing graph

closegraph();

return 0;

}

Posted in Graphics Editor | Leave a comment

c program dda bresenham line and circle drawing algorithm

by Abc

C - Program to Implement DDA and Bresenhams Line and Circle Drawing Algorithm

#include<iostream.h>

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

#include<stdlib.h>

#include<dos.h>

class shape // Declare a class shape

{

float x1,y1,x2,y2;

public:

void dda(float x1,float x2,float y1,float y2); // pass rthe parameters to draw a line

void Bresenhamsline(float x1,float x2,float y1,float y2); // pass the co-ordinates to draw the line

using bresenhamsline drawing algorithm

void Bresenhamscircle(); //pass the co-ordinates to draw the circle using bresenhams circle drawing algorithm

};

void shape::dda(float x1,float x2,float y1,float y2 )

{

int dx,dy,step,xinc,yinc;

float slop,x3,y3;

dx=x2-x1; //passing the parameters to starting and ending points of parameter

dy=y2-y1;

if(abs(dx)>abs(dy))

step=abs(dx); // calculate the absolute value

else

step=abs(dy);

if(dx==0)

slop=float(dy/(dx+0.1)); //find the slope of line

else

slop=float(dy/dx);

putpixel(x1,y1,WHITE);

x3=x1;

y3=y1;

for(int i=1;i<step;i++)

{

If(abs(dx)>abs(dy)&&x3<x2)

{

x3=x3+1;

y3=float(y3+slop);

}

else if(abs(dx)>abs(dy) && x3>x2)

{

x3=x3-1;

y3=y3-slop;

}

else if(abs(dx)<abs(dy) && y3<y2)

{

x3=float(x3+(1/slop));

y3=y3+1;

}

else if(abs(dx)<abs(dy) && y3>y2)

{

x3=float(x3-(1/slop));

y3=y3-1;

}

xinc=(x3+0.5);

yinc=(y3+0.5);

putpixel(xinc,yinc,WHITE);

}

void shape::Bresenhamsline(float x1,float x2,float y1,float y2)

{

float Dx,Dy,x,y,e;

Dx = x2 - x1;

Dy = y2 - y1;

Dx = fabs(Dx);

Dy = fabs(Dy);

x = x1;

y = y1;

e = 2 * (Dy-Dx);

int i;

i = 1;

cleardevice();

{

putpixel(x,y,15);

while(e>=0)

{

y = y + 1;

e = e - (2*Dx);

}

x = x + 1;

e = e + (2 * Dy);

i = i + 1;

}while(i<=Dx);

}

void shape::Bresenhamscircle()

{

float r,d,x,y;

cout<<"\n\tEnter the radius of a circle->";

cin>>r;

clrscr();

cleardevice();

x = 0;

y = r;

d = 3 - (2 * r);

{

putpixel(200+x,200+y,15);

putpixel(200+y,200+x,15);

putpixel(200+y,200-x,15);

putpixel(200+x,200-y,15);

putpixel(200-x,200-y,15);

putpixel(200-y,200-x,15);

putpixel(200-y,200+x,15);

putpixel(200-x,200+y,15);

if(d<=0)

{

d = d + (4*x) + 6;

}

else

{

d = d + (4*(x-y)) + 10;

y = y - 1;

}

x = x +1;

delay(10);

}while(x<y);

}

void main()

{

int ch;

float x1,x2,y1,y2;

shape s;

int gdriver = DETECT, gmode, errorcode;

initgraph(&gdriver, &gmode, "c:\\tc\\bgi");

errorcode = graphresult();

if (errorcode != grOk)

{

printf("Graphics error: %s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1);

}

{

cout<<"\n\n\t\tMENU";

cout<<"\n\t1:DDA line drawing";

cout<<"\n\t2:Bresenhamsline";

cout<<"\n\t3:Bresenhamscircle;";

cout<<"\n\nEnter Your choice";

cin>>ch;

switch(ch)

{

case 1:cout<<"\nEnter (x1,y1) point";

cin>>x1>>y1;

cout<<"\nEnter (x2,y2) point";

cin>>x2>>y2; ;

clrscr();

s.dda(x1,x2,y1,y2);

break;

case 2:

cout<<"\nEnter (x1,y1) point";

cin>>x1>>y1;

cout<<"\nEnter (x2,y2) point";

cin>>x2>>y2; ;

clrscr();

s.Bresenhamsline(x1,x2,y1,y2);

break;

case 3: clrscr();

s.Bresenhamscircle();

break;

}

}while(ch!=4);

getch();

}

Posted in Bresenham, DDA, Line and Circle drawing algorithm | Leave a comment

c/c++ program to implement 2D polygon transformation

by Abc

C/C++ Program to Implement 2D Polygon Transformation

#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<math.h>

int x1,y1,x[20],y[20],n;
float theta;

void draw_poly()
{
int i;
for(i=0;i<n-1;i++)
{
   line(x[i],y[i],x[i+1],y[i+1]);
}
   line(x[0],y[0],x[n-1],y[n-1]);
}

void translate(int x1,int y1)
{
int a;
for(a=0;a<n;a++)
{
    x[a]=x[a]+x1;
    y[a]=y[a]+y1;

}
}

void scale(int x1,int y1)
{
int a,b;
a=x[0];
b=y[0];
translate(-a,-b);
int i;
for(i=0;i<n;i++)
{
    x[i]=x[i]*x1;
    y[i]=y[i]*y1;

}
translate(a,b);

}

void rotate(float theta)
{
int a,b,i,c,d;
a=x[0];
b=y[0];
translate(-a,-b);
for(i=0;i<n;i++)
{
    c=x[i]*cos(theta)-y[i]*sin(theta);
    d=x[i]*sin(theta)+y[i]*cos(theta);
    x[i]=c;
    y[i]=d;
}
translate(a,b);
}

int main()
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;

/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");

/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
   printf("Graphics error: %s\n", grapherrormsg(errorcode));
   printf("Press any key to halt:");
   getch();
   exit(1); /* terminate with an error code */
}
int i;
clrscr();
cout<<"\nEnter no. of Sides:: ";
cin>>n;
cout<<"\nEnter the Co-ordinate of Vertices::";
for(i=0;i<n;i++)
{
   cout<<"\n"<<i+1<<"::";
   cin>>x[i]>>y[i];

}
   draw_poly();
   getch();
   cleardevice();

   clrscr();
   int k;
   do
   {
   clrscr();
   cleardevice();
   cout<<"\n1)Translate\n2)Rotate\n3)Scale\n4)Exit.";
   cout<<"\nEnter Ur Choice::";

   cin>>k;
   switch(k)
   {
       case 1:
           cout<<"\nFor x-axis::";
           cin>>x1;
           cout<<"\nFor y-axis::";
           cin>>y1;
           translate(x1,y1);
           draw_poly();
           getch();
           cleardevice();
           break;

       case 2:
           cout<<"\nEnter the Angle::";
           cin>>theta;
           rotate(theta);
           draw_poly();
           getch();
           cleardevice();
           break;

       case 3:
           cout<<"\nFor x-axis::";
           cin>>x1;
           cout<<"\nFor y-axis::";
           cin>>y1;
           scale(x1,y1);
           draw_poly();
           getch();
           cleardevice();
           break;

   }
    } while(k!=4);
   return 0;
}

Posted in 2D Polygon Transformation | 1 Comment

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c program for graphics editor

C - Program for Graphics Editor

c program dda bresenham line and circle drawing algorithm

C - Program to Implement DDA and Bresenhams Line and Circle Drawing Algorithm

c/c++ program to implement 2D polygon transformation

C/C++ Program to Implement 2D Polygon Transformation

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