Turbo C Graphics - circle function

circle function is used to draw a circle by accepting the center point (x,y) and the radius. It draws just the outline of the circle and it does not fill anything. pieslice is the function used as if circle provided if you want to fill with any color and / or style set by setfillstyle function. pieslice will take additional two arguments startangle and endangle. arc is the function which is similar to pieslice except it does not fill anything and just draws the arc with the start and endangle.

Here is the sample code with circle, pieslice and arc. In the output screen you can see there are 4 arcs, 4 circles and 4 pieslice drawn on 4 corners of the screen (left, top, right, bottom).

// Draw circles

circle(left, top, 25);

circle(right, top, 25);

circle(left, bottom, 25);

circle(right, bottom, 25);

// Draw pie slice

setfillstyle(SOLID_FILL, GREEN);

pieslice(right, top, 0, 90, 25);

pieslice(left, top, 90, 180, 25);

pieslice(left, bottom, 180, 270, 25);

pieslice(right, bottom, 270, 360, 25);

// Draw arc

arc(right, top, 0, 90, 35);

arc(left, top, 90, 180, 35);

arc(left, bottom, 180, 270, 35);

arc(right, bottom, 270, 360, 35);

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Source Code

#include <graphics.h>

#include <stdio.h>

#include <math.h>

#include <conio.h>

#include <dos.h>

#include <stdlib.h>

int InitGraphics()

{

int grd, grm;

int gresult;

// Detect the graphics driver and mode

detectgraph(&grd,&grm);

// initialize the graphics mode with initgraph

initgraph(&grd, &grm, "");

gresult = graphresult();

if(gresult != grOk)

{

printf(grapherrormsg(gresult));

getch();

return -1;

}

// set the background color

setbkcolor(RED);

// set the foreground color

setcolor(WHITE);

// draw a white color border with rectangle

rectangle(0,0,getmaxx(),getmaxy());

return 1;

}

void main()

{

int i, x, y, w;

int left,top,right,bottom;

int margin;

int xradius, yradius;

int cx, cy;

if(InitGraphics() == -1)

return;

margin = 100; // 100 pixel margin

left = margin;

top = margin;

bottom = getmaxy() - margin;

right = getmaxx() - margin;

xradius = (right - left) / 2;

yradius = (bottom - top) / 2;

cx = (left + right) / 2;

cy = (top + bottom) / 2;

// fill an ellipse will BLUE color SOLID

setfillstyle(SOLID_FILL, BLUE);

fillellipse(cx, cy, xradius, yradius);

outtextxy(cx - 95, cy - yradius + 20, "fillellipse 0-360 deg");

// fill a sector (pie) with close dot fill

setfillstyle(CLOSE_DOT_FILL, GREEN);

sector(cx, cy, 0, 270, xradius - 30, yradius - 40);

outtextxy(cx - 30, cy - 50, "sector 0-270 deg");

// draw an elipitical arc and have two ends of arc joined with center point by two lines

setcolor(YELLOW);

moveto(cx + 5, cy + 5);

linerel(xradius - 30, 0);