How
to know the benefits of easily Easy Learning circle Drawing using Bresenbarri's circle
Algorithm
“On this page you will find about the benefits
of easily Easy Learning circle
Drawing using Bresenbarri's circle Algorithm using DDA Algorithm. circle Drawing using
Bresenbarri's circle Algorithm a major
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explain why easily Easy Learning circle
Drawing using Bresenbarri's circle Algorithm using DDA Algorithm is important, how
to Learning Line Drawing algorithem
using DDA Algorithm, and how to learn it if you're unfamiliar with circle
Drawing using Bresenbarri's circle Algorithm. "
What is circle Drawing using Bresenbarri's circle
Algorithm using DDA Algorithm and why is
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Why is circle Drawing using Bresenbarri's circle Algorithm using
DDA Algorithm impotent?
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circle Drawing using Bresenbarri's circle Algorithm and Reminders:
You mentioned similar tips on another page about Line
Drawing algorithem using DDA Algorithm.
How to know the benefits of easily Easy Learning circle Drawing using Bresenbarri's circle
Algorithm:
Circle Drawingn using Bresenbarri's circle Algorithm
Aim:
To draw a circle using Bresenham's circle drawing algorithm in C.
Algorithm:
1. start the program
2.Get the radius and center of the circle r, xc,yc.
3. Obtain the first point on the circumference of a circle centerred on the origin as (x0 y0)= (o,r)
4. calculate the initial value of the parameter P=5/4-r
5.At each xk position, starting at k=0, perform the following test if (Pk<0), the next (0,0) is (Xk+1,Yk+1) and (Pk+1, Yk-1) and Pk+2Xk+1-2Yk+1 where 2k+1 = 2Xk+2 and 2Yk-2.
determiner the symmetry points in other seven actol .
7.move each calculated pixel position (X,Y) onto the circular path centred on (xc,yc) and plot the coordinates value x = x+xc and y=y+yc
8.Repeat the steps 5 to 7 until x7=y .
9. Stop the program
Program:
#include <stdio.h>
#include<conio.h>
#include<graphics.h>
float xc, yc, r,x,y,p;
void plotpoint ();
void main()
{
int gd =DETECT,gm;
initgraph(&gd,&gm,"");
printf("Enter the xc value:");
scanf("%f",& xc);
printf("Enter the yc value :");
scanf("%f",&yc);
printf("Enter the radius :");
scanf("%f",&r);
x=0; y=r;
plotpoint();
p=1-r;
while (x<y)
{
if (p<0)
x++;
else
{
x++;
y--:
}
if (p<0)
p=p+2*(x+1);
else
p=p+2*(x-y)+1;
plotpoint();
}
getch();
closegraph();
}
void plotpoint()
{
putpixel(xc+x,yc+y,1);
putpixel(xc+x,yc+y,1);
putpixel(xc+x,yc+y,1);
putpixel(xc+x,yc+y,1);
putpixel(xc+x,yc+x,1);
putpixel(xc+x,yc+x,1);
putpixel(xc+x,yc+x,1);
putpixel(xc+x,yc+x,1);
}
Ouput:
Enter the xa value : 200
Enter the radius : 50
Ellipse Drawing Algorithm
Aim:
To write program in C to draw eclipse using midpoint eclipse drawing algorithm.
Algorithm :
1. Start the program
2.Get the radius rx, ry, and center of the eclipse
3. Obtain the first point on the eclipse centered on the origin as (x0 y0) = (0,ry)
4.Calculate the initial value of the decision parameter in regional as p10 = ry2 - rx2 ry+1 / 4rx2
5. At each xk position in region 1, starting at k=0 perform the following test if (p1k<0) the next point along the eclipse centered on (0,0) to (xk+1,yk) and p1k+1= P1k+2y2 +ry2 otherwise the next point along the eclipse is (rk+1, y+1) and p1+1= p1k+2ry2xk+1+ ry2 2ry2xk+1=2ry2xk+2ry2 and 2rx2yk+1=2rx2yk-2rx2.
6. Calculate the value of the decision parameter in region 2 using the point (x0,y0) as p20=ry2 (x0+y2)2+ ry2(y0-1)2-rx2+y2.
7. At each yk position in region 2, starting at k=0 perform along following test if (p2k>0), the next point along the eclipse centered (0,0) is (xk,yk+1) and p2k+1=p2k-2rx2yk+1+rx2 otherwise the next point along eclipse is (xk+1,yk+1) and p2k+1 = p2k+2ry2xk+1+rx2-2rx2yk+1
8.Determine the symmetry points in order three qradrants
9. move each calculated pixel position (x,y) on (xc,yc) and point the coordinate values x=x+xc and y=y+yc.
10. Repeat the steps for region 1 until 2ry2xy2rx2y
11. stop the program.
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Elllipse Drawing Algorithm
Program:
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#define round(a) (int)(a+0.5)
Float xc,yc,x,y;
Void main()
{
Int gd =DETECT.gm;
Float rx,ry,p,px,py,rx2,rx2,tworx2,twory2;
Initgraph(&gd,&gm,””);
Clscr();
Printf(“Enter the xc
value:”);
Scanf(“%f”, &xc
value:”);
Printf(“Enter the yc value:”);
Scanf(“%f”,&yc);
Printf(“Enter the x radius:”);
Scanf(“%f’,&ry);
Printf(“Enter the y radius:”);
Scanf(“%f”,&ry);
Ry2 =ry*ry;
Rx2=rx*rx;
Twory2=2*ry2;
Twory2=2*rx2;
X=0;
Y=ry;
Plotpoint();
P=round(ry2-rx2*ry+(0.25*rx2));
Px=0;
Py=tworx2*y;
While(px<py)
{
X=x+1;
Px=px+twory2;
If(p>=0)
{
Y=y-1;
Py=py-tworx2;
}
If(p<0)
P=p+ry2+px;
else
P=p+ry2+px-py;
Plotpoint();
}
P=round(ry2 *(x+0.5)*(x+0.5)+rx2*(y-1)*(y-1)-rx2*ry2);
While(y>0)
{
Y=y-1;
Py=py-tworx2;
If(p<=0)
{
X=x+1;
Px=px+twory2;
}
If(p>0)
P=p+rx2-py;
Else
P=p+rx2-py+px;
Plotpoint();
}
Getch();
Closegraph();
}
Gerch();
Closegraph();
}
Void plotpoint()
{
Putpixel(xc+x,yc+y,1);
Putpixel(xc-x,yc+y,1);
Putpixel(xc+x,yc-y,1);
Putpixel(xc-x,yc-y,1);
}
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