basic concepts of computer graphics lab.

1. Computer Graphics Lab
By Priya Goyal

2. How to run the graphics program in Turbo C++
• Open turbo C++
• Click on Option => Linker => Library
• Click on Graphics(mark it as ‘X’)
• Click on OK
Now you can run your graphics programs.

3. Basic functions to draw shapes in graphics
Shape Function syntax
pixel Draw a pixel Putpixel (X1,Y1,Color)
Line Draw a line Line(X1,Y1,X2,Y2)
Rectangle Draw a rectangle Rectangle(Left,Top,Right,Bottom)
Circle Draw a circle Circle(X,Y,Radius)
Ellipse Draw a ellipse Ellipse(X1,Y1,0,360,XaxisRadius,YaxisRadius)
Arc Draw a arc Arc(X1,Y1,StartingAngle,EndingAngle,Radius)
Bar Draw a filled rectangle Bar(Left,Top,Right,Bottom)
Bar3d Draw a filled 3d rectangle Bar3d(Left,Top,Right,Bottom,depth,topflag)
**topflag will be 0 or 1**
Here X1=distance of first point of shape from X axis,
X2=Distance of last point of shape from X axis
Here Y1=distance of first point of shape from Y axis,
Y2=Distance of last point of shape from Y axis

4. Structure of graphics program
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
……………………
…………………….
getch( );
closegraph( );
}
Location of BGI folder, where
display files are saved. Write the
location of (C:-TC-BGI)
Initialization of
graph

5. Draw a Pixel
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
Putpixel(100,100,RED)
getch( );
closegraph( );
}
Putpixel(X1,Y1,Color)

6. Draw a line
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
Line(100,100,200,200)
getch( );
closegraph( );
}
Line(X1,Y1,X2,Y2)

7. Draw a Rectangle
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
Rectangle(100,100,200,200)
getch( );
closegraph( );
}
rectangle(X1,Y1,X2,Y2)

8. Draw a circle
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
Circle(100,100,10)
getch( );
closegraph( );
}
circle(X1,Y1,radius)

9. Draw an ellipse
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
ellipse(100,100,0,360,20,10);
getch( );
closegraph( );
}
ellipse(x1,y1,0,360,xAxisRadius,yAxisRadius)

10. Draw an Arc
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
arc(100,100,90,280,10);
getch( );
closegraph( );
}
arc(x1,y1,StartingAngle,EndingAngle,Radius)

11. Draw a Bar
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
bar(100,100,200,200);
getch( );
closegraph( );
}
Bar(Left,Top,Right,Bottom)

12. Draw a 3D bar
#include<graphics.h>
#include<stdio.h>
#include<conio.h>
void main( )
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:TCBGI");
bar3d(100,100,200,200,10,1);
getch( );
closegraph( );
}
Bar3d(left,top,right,bottom,depth,topflag)

13. Assignment
Q.1 Draw a flag using line and circle.
Q.2 Draw a hut using line, rectangle and circle.
Q.3 Draw a smiley face using ellipse, circle and arc.
Q.4 Draw a fish using arc, circle and line.