IMPLEMENTATION
OF LINE, CIRCLE AND ELLIPSE ATTRIBUTES
DESCRIPTION:
Output primitives have
geometric and non-geometric attributes. Geometric attributes, such as the
character height, affect the size and shape of a primitive, whereas
non-geometric attributes are qualities such as colour, line style, etc. The
output primitives Such as Line, Circle and Ellipse are associated with set of
attributes such as Line (color and Line Style), Cicrle (Color) and Ellipse
(Color and Patterns).
CODING:
#include /* include the necessary header files*/
#include
#include
#include
int main(void)
{
/*
select a driver and mode that supports */
/*
multiple drawing colors.*/
int
gdriver=EGA,DETECT,gmode=EGAHI,errorcode;
int color,maxcolor,x,y,s,ch,ch1,ch2,i;
int midx,midy;
int radius=100;
int xradius=100,yradius=50;
char msg[80];
char *lname[]={"Solid
Line", "Dotted Line", "Center Line", "Dashed
Line", "Usebit Line"};
/*
initialize graphics and local variables */
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
/*
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 */
}
do{
printf("\n1.Line\n2.Circle\n3.Ellipse\n");
/* get the user choice*/
printf("\nEnter
Your choice\n");
scanf("%d",&ch);
switch(ch)
{
case 1:
printf("Attribute:
1.Color 2.Style:\n");
scanf("%d",&ch1);
switch(ch1)
{
case 1:
maxcolor=getmaxcolor();
/* use predefined methods to change the
color*/
x=getmaxx()/2;
y=getmaxy()/2;
for(color=1;color<=maxcolor;color++)
{
cleardevice();
setcolor(color);
line(100,100,100,300);
sprintf(msg,"Color:%d",color);
outtextxy(x,y,msg);
getch();
}
closegraph();
break;
case 2:
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
for(s=0;s<5 o:p="" s="">
{
setlinestyle(s,1,1);
/* pre defined method for linestyle*/
line(20,20+s*50,120,120+s*50);
outtextxy(125,120+s*50,lname[s]);
}
getch();
closegraph();
break;
}
break;
case 2:
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
midx=getmaxx()/2;
midy=getmaxy()/2;
maxcolor=getmaxcolor();
/* draw circles of different colors*/
for(color=1;color<=maxcolor;color++)
{
cleardevice();
setcolor(color);
/* draw the circle */
circle(midx,midy,radius);
/* clean up */
getch();
}
closegraph();
break;
case 3:
printf("\n1.pattern
2.colour\n"); /* get choice for
color or style of eclipse*/
printf("\nEnter
your choice:\n");
scanf("%d",&ch2);
switch(ch2)
{
case 1:
/* initialize graphics and local variables */
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
midx=getmaxx()/2;
midy=getmaxy()/2;
/* loop through the fill patterns */
for(i=EMPTY_FILL;i
{
/* set fill pattern */
setfillstyle(i,getmaxcolor());
/* draw a filled ellipse */
fillellipse(midx,
midy, xradius, yradius);
getch();
}
closegraph();
break;
case 2:
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
maxcolor=getmaxcolor();
for(color=1;color<=maxcolor;color++)
{
cleardevice();
setcolor(color);
ellipse(100,200,0,360,xradius,yradius);
getch();
}
/* clean up */
closegraph();
break;
}
default:
//exit(0);
break;
}
}
while(ch==3);
return 0;
}
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