Paint Program

/*
Write a program in C for Paint
*/

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

union REGS i, o;
int leftcolor[15];

int get_key()
{
union REGS i,o;

i.h.ah = 0;
int86(22,&i,&o);

return ( o.h.ah );
}

void draw_color_panel()
{
int left, top, c, color;

left = 100;
top = 436;

color = getcolor();
setcolor(GREEN);
rectangle(4,431,635,457);
setcolor(RED);
settextstyle(TRIPLEX_FONT,0,2);
outtextxy(10,431,"Colors : ");

for( c = 1 ; c <= 15 ; c++ )
{
setfillstyle(SOLID_FILL, c);
bar(left, top, left+16, top+16);
leftcolor[c-1] = left;
left += 26;
}

setcolor(color);
}

void draw_shape_panel()
{
int left, top, c, color;

left = 529;
top = 45;

color = getcolor();
setcolor(GREEN);
rectangle(525,40,633,255);

for( c = 1 ; c <= 7 ; c++ )
{
rectangle(left, top, left+100, top+25);
top += 30;
}
setcolor(RED);
outtextxy(530,45,"Bar");
outtextxy(530,75,"Line");
outtextxy(530,105,"Pixel");
outtextxy(530,135,"Ellipse");
outtextxy(530,165,"Freehand");
outtextxy(530,195,"Rectangle");
outtextxy(530,225,"Clear");
setcolor(color);
}

void change_color(int x, int y)
{
int c;

for( c = 0 ; c <= 13 ; c++ )
{
if( x > leftcolor[c] && x < leftcolor[c+1] && y > 437 && y < 453 )
setcolor(c+1);
if( x > leftcolor[14] && x < 505 && y > 437 && y < 453 )
setcolor(WHITE);
}
}

char change_shape(int x, int y)
{
if ( x > 529 && x < 625 && y > 45 && y < 70 )
return 'b';
else if ( x > 529 && x < 625 && y > 75 && y < 100 )
return 'l';
else if ( x > 529 && x < 625 && y > 105 && y < 130 )
return 'p';
else if ( x > 529 && x < 625 && y > 135 && y < 160 )
return 'e';
else if ( x > 529 && x < 625 && y > 165 && y < 190 )
return 'f';
else if ( x > 529 && x < 625 && y > 195 && y < 220 )
return 'r';
else if ( x > 529 && x < 625 && y > 225 && y < 250 )
return 'c';
}

void showmouseptr()
{
i.x.ax = 1;
int86(0x33,&i,&o);
}

void hidemouseptr()
{
i.x.ax = 2;
int86(0x33,&i,&o);
}

void restrictmouseptr( int x1, int y1, int x2, int y2)
{
i.x.ax = 7;
i.x.cx = x1;
i.x.dx = x2;
int86(0x33,&i,&o);

i.x.ax = 8;
i.x.cx = y1;
i.x.dx = y2;
int86(0x33,&i,&o);
}

void getmousepos(int *button,int *x,int *y)
{
i.x.ax = 3;
int86(0x33,&i,&o);

*button = o.x.bx;
*x = o.x.cx;
*y = o.x.dx;
}

main()
{
int gd = DETECT,gm;

int maxx,maxy,x,y,button,prevx,prevy,temp1,temp2,key,color;
char ch = 'f' ; // default free-hand drawing

initgraph(&gd,&gm,"C:\\TC\\BGI");

maxx = getmaxx();
maxy = getmaxy();

setcolor(BLUE);
rectangle(0,0,maxx,maxy);

setcolor(WHITE);
settextstyle(SANS_SERIF_FONT,HORIZ_DIR,2);
outtextxy(maxx/2-180,maxy-28,"www.cprogrammingworld123.blogspot.in");

draw_color_panel();
draw_shape_panel();

setviewport(1,1,maxx-1,maxy-1,1);

restrictmouseptr(1,1,maxx-1,maxy-1);
showmouseptr();
rectangle(2,2,518,427);
setviewport(1,1,519,428,1);

while(1)
{
if(kbhit())
{
key = get_key();

if( key == 1 )
{
closegraph();
exit(0);
}
}

getmousepos(&button,&x,&y);

if( button == 1 )
{
if( x > 4 && x < 635 && y > 431 && y < 457 )
change_color( x, y );
else if ( x > 529 && x < 625 && y > 40 && y < 250 )
ch = change_shape( x, y );

temp1 = x ;
temp2 = y ;

if ( ch == 'f' )
{
hidemouseptr();
while( button == 1 )
{
line(temp1,temp2,x,y);
temp1 = x;
temp2 = y;
getmousepos(&button,&x,&y);
}
showmouseptr();
}

while( button == 1)
getmousepos(&button,&x,&y);

/* to avoid interference of mouse while drawing */
hidemouseptr();

if( ch == 'p')
putpixel(x,y,getcolor());

else if ( ch == 'b' )
{
setfillstyle(SOLID_FILL,getcolor());
bar(temp1,temp2,x,y);
}
else if ( ch == 'l')
line(temp1,temp2,x,y);
else if ( ch == 'e')
ellipse(temp1,temp2,0,360,abs(x-temp1),abs(y-temp2));
else if ( ch == 'r' )
rectangle(temp1,temp2,x,y);
else if ( ch == 'c' )
{
ch = 'f'; // setting to freehand drawing
clearviewport();
color = getcolor();
setcolor(WHITE);
rectangle(2,2,518,427);
setcolor(color);
}

showmouseptr();
}
}
}