/*
   GRAPHICS DEMO FOR Borland C++ 

   Copyright (c) 1987, 1993 Borland International. All rights reserved.

   From the command line, use:

		bcc bgidemo graphics.lib

*/

#ifdef __TINY__
#error BGIDEMO will not run in the tiny model.
#endif

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

#include <graphics.h>

#define ESC     0x1b                    /* Define the escape key        */
#define TRUE    1                       /* Define some handy constants  */
#define FALSE   0                       /* Define some handy constants  */
#define PI      3.14159                 /* Define a value for PI        */
#define ON      1                       /* Define some handy constants  */
#define OFF     0                       /* Define some handy constants  */

#define NFONTS 11

char *Fonts[NFONTS] = {
  "DefaultFont",   "TriplexFont",   "SmallFont",
  "SansSerifFont", "GothicFont", "ScriptFont", "SimplexFont", "TriplexScriptFont",
  "ComplexFont", "EuropeanFont", "BoldFont"
};

char *LineStyles[] = {
  "SolidLn",  "DottedLn",  "CenterLn",  "DashedLn",  "UserBitLn"
};

char *FillStyles[] = {
  "EmptyFill",  "SolidFill",      "LineFill",      "LtSlashFill",
  "SlashFill",  "BkSlashFill",    "LtBkSlashFill", "HatchFill",
  "XHatchFill", "InterleaveFill", "WideDotFill",   "CloseDotFill"
};

char *TextDirect[] = {
  "HorizDir",  "VertDir"
};

char *HorizJust[] = {
  "LeftText",   "CenterText",   "RightText"
};

char *VertJust[] = {
  "BottomText",  "CenterText",  "TopText"
};

struct PTS {
  int x, y;
};      /* Structure to hold vertex points      */

int    GraphDriver;             /* The Graphics device driver           */
int    GraphMode;               /* The Graphics mode value              */
double AspectRatio;             /* Aspect ratio of a pixel on the screen*/
int    MaxX, MaxY;              /* The maximum resolution of the screen */
int    MaxColors;               /* The maximum # of colors available    */
int    ErrorCode;               /* Reports any graphics errors          */
struct palettetype palette;             /* Used to read palette info    */

/*                                                                      */
/*      Function prototypes                                             */
/*                                                                      */

void Initialize(void);
void ReportStatus(void);
void TextDump(void);
void Bar3DDemo(void);
void RandomBars(void);
void TextDemo(void);
void ColorDemo(void);
void ArcDemo(void);
void CircleDemo(void);
void PieDemo(void);
void BarDemo(void);
void LineRelDemo(void);
void PutPixelDemo(void);
void PutImageDemo(void);
void LineToDemo(void);
void LineStyleDemo(void);
void CRTModeDemo(void);
void UserLineStyleDemo(void);
void FillStyleDemo(void);
void FillPatternDemo(void);
void PaletteDemo(void);
void PolyDemo(void);
void SayGoodbye(void);
void Pause(void);
void MainWindow(char *header);
void StatusLine(char *msg);
void DrawBorder(void);
void changetextstyle(int font, int direction, int charsize);
int  gprintf(int *xloc, int *yloc, char *fmt, ... );

/*                                                                      */
/*      Begin main function                                             */
/*                                                                      */

int main()
{

  Initialize();                 /* Set system into Graphics mode        */
  ReportStatus();               /* Report results of the initialization */

  ColorDemo();                  /* Begin actual demonstration           */
  if( GraphDriver==EGA || GraphDriver==EGALO || GraphDriver==VGA )
    PaletteDemo();
  PutPixelDemo();
  PutImageDemo();
  Bar3DDemo();
  BarDemo();
  RandomBars();
  ArcDemo();
  CircleDemo();
  PieDemo();
  LineRelDemo();
  LineToDemo();
  LineStyleDemo();
  UserLineStyleDemo();
  TextDump();
  TextDemo();
  CRTModeDemo();
  FillStyleDemo();
  FillPatternDemo();
  PolyDemo();
  SayGoodbye();                 /* Give user the closing screen         */

  closegraph();                 /* Return the system to text mode       */
  return(0);
}

/*                                                                      */
/*      INITIALIZE: Initializes the graphics system and reports         */
/*      any errors which occured.                                       */
/*                                                                      */

void Initialize(void)
{
  int xasp, yasp;                       /* Used to read the aspect ratio*/

  GraphDriver = DETECT;                 /* Request auto-detection       */
  initgraph( &GraphDriver, &GraphMode, "" );
  ErrorCode = graphresult();            /* Read result of initialization*/
  if( ErrorCode != grOk ){              /* Error occured during init    */
    printf(" Graphics System Error: %s\n", grapherrormsg( ErrorCode ) );
    exit( 1 );
  }

  getpalette( &palette );               /* Read the palette from board  */
  MaxColors = getmaxcolor() + 1;        /* Read maximum number of colors*/

  MaxX = getmaxx();
  MaxY = getmaxy();                     /* Read size of screen          */

  getaspectratio( &xasp, &yasp );       /* read the hardware aspect     */
  AspectRatio = (double)xasp / (double)yasp; /* Get correction factor   */

}

/*                                                                      */
/*      REPORTSTATUS: Report the current configuration of the system    */
/*      after the auto-detect initialization.                           */
/*                                                                      */

void ReportStatus(void)
{
  struct viewporttype     viewinfo;     /* Params for inquiry procedures*/
  struct linesettingstype lineinfo;
  struct fillsettingstype fillinfo;
  struct textsettingstype textinfo;
  struct palettetype      palette;

  char *driver, *mode;                  /* Strings for driver and mode  */
  int x, y;

  getviewsettings( &viewinfo );
  getlinesettings( &lineinfo );
  getfillsettings( &fillinfo );
  gettextsettings( &textinfo );
  getpalette( &palette );

  x = 10;
  y = 4;

  MainWindow( "Status report after InitGraph" );
  settextjustify( LEFT_TEXT, TOP_TEXT );

  driver = getdrivername();
  mode = getmodename(GraphMode);        /* get current setting          */

  gprintf( &x, &y, "Graphics device    : %-20s (%d)", driver, GraphDriver );
  gprintf( &x, &y, "Graphics mode      : %-20s (%d)", mode, GraphMode );
  gprintf( &x, &y, "Screen resolution  : ( 0, 0, %d, %d )", getmaxx(), getmaxy() );

  gprintf( &x, &y, "Current view port  : ( %d, %d, %d, %d )",
  viewinfo.left, viewinfo.top, viewinfo.right, viewinfo.bottom );
  gprintf( &x, &y, "Clipping           : %s", viewinfo.clip ? "ON" : "OFF" );

  gprintf( &x, &y, "Current position   : ( %d, %d )", getx(), gety() );
  gprintf( &x, &y, "Colors available   : %d", MaxColors );
  gprintf( &x, &y, "Current color      : %d", getcolor() );

  gprintf( &x, &y, "Line style         : %s", LineStyles[ lineinfo.linestyle ] );
  gprintf( &x, &y, "Line thickness     : %d", lineinfo.thickness );

  gprintf( &x, &y, "Current fill style : %s", FillStyles[ fillinfo.pattern ] );
  gprintf( &x, &y, "Current fill color : %d", fillinfo.color );

  gprintf( &x, &y, "Current font       : %s", Fonts[ textinfo.font ] );
  gprintf( &x, &y, "Text direction     : %s", TextDirect[ textinfo.direction ] );
  gprintf( &x, &y, "Character size     : %d", textinfo.charsize );
  gprintf( &x, &y, "Horizontal justify : %s", HorizJust[ textinfo.horiz ] );
  gprintf( &x, &y, "Vertical justify   : %s", VertJust[ textinfo.vert ] );

  Pause();                              /* Pause for user to read screen*/

}

/*                                                                      */
/*      TEXTDUMP: Display the all the characters in each of the         */
/*      available fonts.                                                */
/*                                                                      */

void TextDump()
{
  static int CGASizes[]  = {
    1, 3, 7, 3, 3, 2, 2, 2, 2, 2, 2  };
  static int NormSizes[] = {
    1, 4, 7, 4, 4, 2, 2, 2, 2, 2, 2  };

  char buffer[80];
  int font, ch, wwidth, lwidth, size;
  struct viewporttype vp;

  for( font=0 ; font<NFONTS ; ++font ){ /* For each available font      */
    sprintf( buffer, "%s Character Set", Fonts[font] );
    MainWindow( buffer );               /* Display fontname as banner   */
    getviewsettings( &vp );             /* read current viewport        */

    settextjustify( LEFT_TEXT, TOP_TEXT );
    moveto( 2, 3 );

    buffer[1] = '\0';                   /* Terminate string             */
    wwidth = vp.right - vp.left;        /* Determine the window width   */
    lwidth = textwidth( "H" );          /* Get average letter width     */

    if( font == DEFAULT_FONT ){
      changetextstyle( font, HORIZ_DIR, 1 );
      ch = 0;
      while( ch < 256 ){                /* For each possible character  */
	buffer[0] = (char)ch;           /* Put character into a string  */
	outtext( buffer );              /* send string to screen        */
	if( (getx() + lwidth) > wwidth )
	  moveto( 2, gety() + textheight("H") + 3 );
	++ch;                           /* Goto the next character      */
      }
    }
    else{

      size = (MaxY < 200) ? CGASizes[font] : NormSizes[font];
      changetextstyle( font, HORIZ_DIR, size );

      ch = '!';                         /* Begin at 1st printable       */
      while( ch < 256 ){                /* For each printable character */
	buffer[0] = (char)ch;           /* Put character into a string  */
	outtext( buffer );              /* send string to screen        */
	if( (lwidth+getx()) > wwidth )  /* Are we still in window?      */
	  moveto( 2, gety()+textheight("H")+3 );
	++ch;                           /* Goto the next character      */
      }

    }

    Pause();                            /* Pause until user acks        */

  }                                     /* End of FONT loop             */

}

/*                                                                      */
/*      BAR3DDEMO: Display a 3-D bar chart on the screen.               */
/*                                                                      */

void Bar3DDemo(void)
{
  static int barheight[] = {
    1, 3, 5, 4, 3, 2, 1, 5, 4, 2, 3   };
  struct viewporttype vp;
  int xstep, ystep;
  int i, j, h, color, bheight;
  char buffer[10];

  MainWindow( "Bar 3-D / Rectangle Demonstration" );

  h = 3 * textheight( "H" );
  getviewsettings( &vp );
  settextjustify( CENTER_TEXT, TOP_TEXT );
  changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
  outtextxy( MaxX/2, 6, "These are 3-D Bars" );
  changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
  setviewport( vp.left+50, vp.top+40, vp.right-50, vp.bottom-10, 1 );
  getviewsettings( &vp );

  line( h, h, h, vp.bottom-vp.top-h );
  line( h, (vp.bottom-vp.top)-h, (vp.right-vp.left)-h, (vp.bottom-vp.top)-h );
  xstep = ((vp.right-vp.left) - (2*h)) / 10;
  ystep = ((vp.bottom-vp.top) - (2*h)) / 5;
  j = (vp.bottom-vp.top) - h;
  settextjustify( CENTER_TEXT, CENTER_TEXT );

  for( i=0 ; i<6 ; ++i ){
    line( h/2, j, h, j );
    itoa( i, buffer, 10 );
    outtextxy( 0, j, buffer );
    j -= ystep;
  }

  j = h;
  settextjustify( CENTER_TEXT, TOP_TEXT );

  for( i=0 ; i<11 ; ++i ){
    color = random( MaxColors );
    setfillstyle( i+1, color );
    line( j, (vp.bottom-vp.top)-h, j, (vp.bottom-vp.top-3)-(h/2) );
    itoa( i, buffer, 10 );
    outtextxy( j, (vp.bottom-vp.top)-(h/2), buffer );
    if( i != 10 ){
      bheight = (vp.bottom-vp.top) - h - 1;
      bar3d( j, (vp.bottom-vp.top-h)-(barheight[i]*ystep), j+xstep, bheight, 15, 1 );
    }
    j += xstep;
  }

  Pause();                              /* Pause for user's response    */

}

/*                                                                      */
/*      RANDOMBARS: Display random bars                                 */
/*                                                                      */

void RandomBars(void)
{
  int color;

  MainWindow( "Random Bars" );
  StatusLine( "Esc aborts or press a key..." ); /* Put msg at bottom of screen   */
  while( !kbhit() ){                    /* Until user enters a key...   */
    color = random( MaxColors-1 )+1;
    setcolor( color );
    setfillstyle( random(11)+1, color );
    bar3d( random( getmaxx() ), random( getmaxy() ),
	   random( getmaxx() ), random( getmaxy() ), 0, OFF);
  }

  Pause();                              /* Pause for user's response    */

}


/*                                                                      */
/*      TEXTDEMO: Show each font in several sizes to the user.          */
/*                                                                      */

void TextDemo(void)
{
  int charsize[] = {
    1, 3, 7, 3, 4, 2, 2, 2, 2, 2, 2   };
  int font, size;
  int h, x, y, i;
  struct viewporttype vp;
  char buffer[80];

  for( font=0 ; font<NFONTS ; ++font ){ /* For each of the avail. fonts */

    sprintf( buffer, "%s Demonstration", Fonts[font] );
    MainWindow( buffer );
    getviewsettings( &vp );

    changetextstyle( font, VERT_DIR, charsize[font] );
    settextjustify( CENTER_TEXT, BOTTOM_TEXT );
    outtextxy( 2*textwidth("M"), vp.bottom - 2*textheight("M"), "Vertical" );

    changetextstyle( font, HORIZ_DIR, charsize[font] );
    settextjustify( LEFT_TEXT, TOP_TEXT );
    outtextxy( 2*textwidth("M"), 2, "Horizontal" );

    settextjustify( CENTER_TEXT, CENTER_TEXT );
    x = (vp.right - vp.left) / 2;
    y = textheight( "H" );

    for( i=1 ; i<5 ; ++i ){             /* For each of the sizes */
      size = (font == SMALL_FONT) ? i+3 : i;
      changetextstyle( font, HORIZ_DIR, size );
      h = textheight( "H" );
      y += h;
      sprintf( buffer, "Size %d", size );
      outtextxy( x, y, buffer );

    }

    if( font != DEFAULT_FONT ){         /* Show user declared font size */
      y += h / 2;                       /* Move down the screen         */
      settextjustify( CENTER_TEXT, TOP_TEXT );
      setusercharsize( 5, 6, 3, 2 );
      changetextstyle( font, HORIZ_DIR, USER_CHAR_SIZE );
      outtextxy( (vp.right-vp.left)/2, y, "User Defined Size" );
    }

    Pause();                            /* Pause to let user look       */

  }                                     /* End of FONT loop             */

}

/*                                                                      */
/*      COLORDEMO: Display the current color palette on the screen.     */
/*                                                                      */

void ColorDemo(void)
{
  struct viewporttype vp;
  int color, height, width;
  int x, y, i, j;
  char cnum[5];

  MainWindow( "Color Demonstration" );  /* Show demonstration name      */

  color = 1;
  getviewsettings( &vp );               /* Get the current window size  */
  width  = 2 * ( (vp.right+1) / 16 );      /* Get box dimensions           */
  height = 2 * ( (vp.bottom-10) / 10 );

  x = width / 2;
  y = height / 2;       /* Leave 1/2 box border         */

  for( j=0 ; j<3 ; ++j ){               /* Row loop                     */

    for( i=0 ; i<5 ; ++i ){             /* Column loop                  */

      setfillstyle(SOLID_FILL, color);  /* Set to solid fill in color   */
      setcolor( color );                /* Set the same border color    */

      bar( x, y, x+width, y+height );   /* Draw the rectangle           */
      rectangle( x, y, x+width, y+height );  /* outline the rectangle   */

      if( color == BLACK ){             /* If box was black...          */
	setcolor( WHITE );              /* Set drawing color to white   */
	rectangle( x, y, x+width, y+height );  /* Outline black in white*/
      }

      itoa( color, cnum, 10 );          /* Convert # to ASCII           */
      outtextxy( x+(width/2), y+height+4, cnum );  /* Show color #      */

      color = ++color % MaxColors;      /* Advance to the next color    */
      x += (width / 2) * 3;             /* move the column base         */
    }                           /* End of Column loop           */

    y += (height / 2) * 3;              /* move the row base            */
    x = width / 2;                      /* reset column base            */
  }                                     /* End of Row loop              */

  Pause();                              /* Pause for user's response    */

}

/*                                                                      */
/*      ARCDEMO: Display a random pattern of arcs on the screen */
/*      until the user says enough.                                     */
/*                                                                      */

void ArcDemo(void)
{
  int mradius;                          /* Maximum radius allowed       */
  int eangle;                           /* Random end angle of Arc      */
  struct arccoordstype ai;              /* Used to read Arc Cord info   */

  MainWindow( "Arc Demonstration" );
  StatusLine( "ESC Aborts - Press a Key to stop" );

  mradius = MaxY / 10;                  /* Determine the maximum radius */

  while( !kbhit() ){                    /* Repeat until a key is hit    */
    setcolor( random( MaxColors - 1 ) + 1 );    /* Randomly select a color      */
    eangle = random( 358 ) + 1;         /* Select an end angle          */
    arc( random(MaxX), random(MaxY), random(eangle), eangle, mradius );
    getarccoords( &ai );                /* Read Cord data               */
    line( ai.x, ai.y, ai.xstart, ai.ystart ); /* line from start to center */
    line( ai.x, ai.y,   ai.xend,   ai.yend ); /* line from end to center   */
  }                                     /* End of WHILE not KBHIT       */

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      CIRCLEDEMO: Display a random pattern of circles on the screen   */
/*      until the user says enough.                                     */
/*                                                                      */

void CircleDemo(void)
{
  int mradius;                          /* Maximum radius allowed       */

  MainWindow( "Circle Demonstration" );
  StatusLine( "ESC Aborts - Press a Key to stop" );

  mradius = MaxY / 10;                  /* Determine the maximum radius */

  while( !kbhit() ){                    /* Repeat until a key is hit    */
    setcolor( random( MaxColors - 1 ) + 1 );    /* Randomly select a color      */
    circle( random(MaxX), random(MaxY), random(mradius) );
  }                                     /* End of WHILE not KBHIT       */

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      PIEDEMO: Display a pie chart on the screen.                     */
/*                                                                      */

#define adjasp( y )     ((int)(AspectRatio * (double)(y)))
#define torad( d )      (( (double)(d) * PI ) / 180.0 )

void PieDemo(void)
{
  struct viewporttype vp;
  int xcenter, ycenter, radius, lradius;
  int x, y;
  double radians, piesize;

  MainWindow( "Pie Chart Demonstration" );

  getviewsettings( &vp );               /* Get the current viewport     */
  xcenter = (vp.right - vp.left) / 2;   /* Center the Pie horizontally  */
  ycenter = (vp.bottom - vp.top) / 2+20;/* Center the Pie vertically    */
  radius  = (vp.bottom - vp.top) / 3;   /* It will cover 2/3rds screen  */
  piesize = (vp.bottom - vp.top) / 4.0; /* Optimum height ratio of pie  */

  while( (AspectRatio*radius) < piesize ) ++radius;

  lradius = radius + ( radius / 5 );    /* Labels placed 20% farther    */

  changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
  settextjustify( CENTER_TEXT, TOP_TEXT );
  outtextxy( MaxX/2, 6, "This is a Pie Chart" );
  changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 1 );
  settextjustify( CENTER_TEXT, TOP_TEXT );

  setfillstyle( SOLID_FILL, RED );
  pieslice( xcenter+10, ycenter-adjasp(10), 0, 90, radius );
  radians = torad( 45 );
  x = xcenter + (int)( cos( radians ) * (double)lradius );
  y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
  settextjustify( LEFT_TEXT, BOTTOM_TEXT );
  outtextxy( x, y, "25 %" );

  setfillstyle( WIDE_DOT_FILL, GREEN );
  pieslice( xcenter, ycenter, 90, 135, radius );
  radians = torad( 113 );
  x = xcenter + (int)( cos( radians ) * (double)lradius );
  y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
  settextjustify( RIGHT_TEXT, BOTTOM_TEXT );
  outtextxy( x, y, "12.5 %" );

  setfillstyle( INTERLEAVE_FILL, YELLOW );
  settextjustify( RIGHT_TEXT, CENTER_TEXT );
  pieslice( xcenter-10, ycenter, 135, 225, radius );
  radians = torad( 180 );
  x = xcenter + (int)( cos( radians ) * (double)lradius );
  y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
  settextjustify( RIGHT_TEXT, CENTER_TEXT );
  outtextxy( x, y, "25 %" );

  setfillstyle( HATCH_FILL, BLUE );
  pieslice( xcenter, ycenter, 225, 360, radius );
  radians = torad( 293 );
  x = xcenter + (int)( cos( radians ) * (double)lradius );
  y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
  settextjustify( LEFT_TEXT, TOP_TEXT );
  outtextxy( x, y, "37.5 %" );

  Pause();                              /* Pause for user's response    */

}

/*                                                                      */
/*      BARDEMO: Draw a 2-D bar chart using Bar and Rectangle.          */
/*                                                                      */

void BarDemo(void)
{
  int barheight[] = {
    1, 3, 5, 2, 4   };
  int styles[]    = {
    1, 3, 10, 5, 9, 1   };
  int xstep, ystep;
  int sheight, swidth;
  int i, j, h;
  struct viewporttype vp;
  char buffer[40];

  MainWindow( "Bar / Rectangle demonstration" );
  h = 3 * textheight( "H" );
  getviewsettings( &vp );
  settextjustify( CENTER_TEXT, TOP_TEXT );
  changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
  outtextxy( MaxX /2, 6, "These are 2-D Bars" );
  changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
  setviewport( vp.left+50, vp.top+30, vp.right-50, vp.bottom-10, 1 );

  getviewsettings( &vp );
  sheight = vp.bottom - vp.top;
  swidth  = vp.right  - vp.left;

  line( h, h, h, sheight-h );
  line( h, sheight-h, sheight-h, sheight-h );
  ystep = (sheight - (2*h) ) / 5;
  xstep = (swidth  - (2*h) ) / 5;
  j = sheight - h;
  settextjustify( CENTER_TEXT, CENTER_TEXT );

  for( i=0 ; i<6 ; ++i ){
    line( h/2, j, h, j );
    itoa( i, buffer, 10 );
    outtextxy( 0, j, buffer );
    j -= ystep;
  }

  j = h;
  settextjustify( CENTER_TEXT, TOP_TEXT );
  for( i=0 ; i<6 ; ++i ){
    setfillstyle( styles[i], random(MaxColors) );
    line( j, sheight - h, j, sheight- 3 - (h/2) );
    itoa( i, buffer, 10 );
    outtextxy( j, sheight - (h/2), buffer );
    if( i != 5 ){
      bar( j, (sheight-h)-(barheight[i] * ystep), j+xstep, sheight-h-1 );
      rectangle( j, (sheight-h)-(barheight[i] * ystep), j+xstep, sheight-h);
    }
    j += xstep;
  }

  Pause();

}

/*                                                                      */
/*      LINERELDEMO: Display pattern using moverel and linerel cmds.    */
/*                                                                      */

void LineRelDemo(void)
{
  struct viewporttype vp;
  int h, w, dx, dy, cx, cy;
  struct PTS outs[7];


  MainWindow( "MoveRel / LineRel Demonstration" );
  StatusLine( "Press any key to continue, ESC to Abort" );

  getviewsettings( &vp );
  cx = (vp.right  - vp.left) / 2;       /* Center of the screen coords  */
  cy = (vp.bottom - vp.top ) / 2;

  h  = (vp.bottom - vp.top ) / 8;
  w  = (vp.right  - vp.left) / 9;

  dx = 2 * w;
  dy = 2 * h;

  setcolor( BLACK );

  setfillstyle( SOLID_FILL, BLUE );
  bar( 0, 0, vp.right-vp.left, vp.bottom-vp.top );      /* Draw backgnd */

  outs[0].x = cx -  dx;
  outs[0].y = cy -  dy;
  outs[1].x = cx - (dx-w);
  outs[1].y = cy - (dy+h);
  outs[2].x = cx +  dx;
  outs[2].y = cy - (dy+h);
  outs[3].x = cx +  dx;
  outs[3].y = cy +  dy;
  outs[4].x = cx + (dx-w);
  outs[4].y = cy + (dy+h);
  outs[5].x = cx -  dx;
  outs[5].y = cy + (dy+h);
  outs[6].x = cx -  dx;
  outs[6].y = cy -  dy;

  setfillstyle( SOLID_FILL, WHITE );
  fillpoly( 7, (int far *)outs );

  outs[0].x = cx - (w/2);
  outs[0].y = cy + h;
  outs[1].x = cx + (w/2);
  outs[1].y = cy + h;
  outs[2].x = cx + (w/2);
  outs[2].y = cy - h;
  outs[3].x = cx - (w/2);
  outs[3].y = cy - h;
  outs[4].x = cx - (w/2);
  outs[4].y = cy + h;

  setfillstyle( SOLID_FILL, BLUE );
  fillpoly( 5, (int far *)outs );

  /*    Draw a Tesseract object on the screen using the LineRel and     */
  /*    MoveRel drawing commands.                                       */

  moveto( cx-dx, cy-dy );
  linerel(  w, -h );
  linerel(  3*w,        0 );
  linerel(   0,  5*h );
  linerel( -w,  h );
  linerel( -3*w,        0 );
  linerel(   0, -5*h );

  moverel( w, -h );
  linerel(   0,  5*h );
  linerel( w+(w/2), 0 );
  linerel(   0, -3*h );
  linerel( w/2,   -h );
  linerel( 0, 5*h );

  moverel(  0, -5*h );
  linerel( -(w+(w/2)), 0 );
  linerel( 0, 3*h );
  linerel( -w/2, h );

  moverel( w/2, -h );
  linerel( w, 0 );

  moverel( 0, -2*h );
  linerel( -w, 0 );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      PUTPIXELDEMO: Display a pattern of random dots on the screen    */
/*      and pick them back up again.                                    */
/*                                                                      */

void PutPixelDemo(void)
{
  int seed = 1958;
  int i, x, y, h, w, color;
  struct viewporttype vp;

  MainWindow( "PutPixel / GetPixel Demonstration" );

  getviewsettings( &vp );
  h = vp.bottom - vp.top;
  w = vp.right  - vp.left;

  srand( seed );                        /* Restart random # function    */

  for( i=0 ; i<5000 ; ++i ){            /* Put 5000 pixels on screen    */
    x = 1 + random( w - 1 );            /* Generate a random location   */
    y = 1 + random( h - 1 );
    color = random( MaxColors );
    putpixel( x, y, color );
  }

  srand( seed );                        /* Restart Random # at same #   */

  for( i=0 ; i<5000 ; ++i ){            /* Take the 5000 pixels off     */
    x = 1 + random( w - 1 );            /* Generate a random location   */
    y = 1 + random( h - 1 );
    color = getpixel( x, y );           /* Read the color pixel         */
    if( color == random( MaxColors ) )  /* Used to keep RANDOM in sync  */
      putpixel( x, y, 0 );              /* Write pixel to BLACK         */
  }

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*   PUTIMAGEDEMO                                                       */
/*                                                                      */
void PutImageDemo(void)
{
  static int r      = 20;
  static int StartX = 100;
  static int StartY = 50;

  struct viewporttype vp;
  int PauseTime, x, y, ulx, uly, lrx, lry, size, i, width, height, step;
  void *Saucer;

  MainWindow("GetImage / PutImage Demonstration");
  getviewsettings( &vp );

  /* Draw Saucer */
  setfillstyle( SOLID_FILL, getmaxcolor() );
  fillellipse(StartX, StartY, r, (r/3)+2);
  ellipse(StartX, StartY-4, 190, 357, r, r/3);

  line(StartX+7, StartY-6, StartX+10, StartY-12);
  circle(StartX+10, StartY-12, 2);
  line(StartX-7, StartY-6, StartX-10, StartY-12);
  circle(StartX-10, StartY-12, 2);


  /* Read saucer image */
  ulx = StartX-(r+1);
  uly = StartY-14;
  lrx = StartX+(r+1);
  lry = StartY+(r/3)+3;
  width = lrx - ulx + 1;
  height = lry - uly + 1;
  size = imagesize(ulx, uly, lrx, lry);

  Saucer = malloc( size );
  getimage(ulx, uly, lrx, lry, Saucer);
  putimage(ulx, uly, Saucer, XOR_PUT);

/* Plot some "stars"  */
  for ( i=0 ; i<1000; ++i )
    putpixel(random(MaxX), random(MaxY), random( MaxColors-1 )+1);
  x = MaxX / 2;
  y = MaxY / 2;
  PauseTime = 70;

  /* until a key is hit */
  while ( !kbhit() ) {

    /* Draw the Saucer */
    putimage(x, y, Saucer, XOR_PUT);                 /*  draw image  */
    delay(PauseTime);
    putimage(x, y, Saucer, XOR_PUT);                 /* erase image  */

    /* Move Saucer */

    step = random( 2*r );
    if ((step/2) % 2 != 0 )
      step = -1 * step;
    x = x + step;
    step = random( r );
    if ((step/2) % 2 != 0 )
      step = -1 * step;
    y = y + step;

    if (vp.left + x + width - 1 > vp.right)
      x = vp.right-vp.left-width + 1;
    else
      if (x < 0)
	x = 0;
    if (vp.top + y + height - 1 > vp.bottom)
      y = vp.bottom-vp.top-height + 1;
    else
      if (y < 0)
	y = 0;
  }
  free( Saucer );
  Pause();
}


/*                                                                      */
/*      LINETODEMO: Display a pattern using moveto and lineto commands. */
/*                                                                      */

#define MAXPTS  15

void LineToDemo(void)
{
  struct viewporttype vp;
  struct PTS points[MAXPTS];
  int i, j, h, w, xcenter, ycenter;
  int radius, angle, step;
  double  rads;

  MainWindow( "MoveTo / LineTo Demonstration" );

  getviewsettings( &vp );
  h = vp.bottom - vp.top;
  w = vp.right  - vp.left;

  xcenter = w / 2;                      /* Determine the center of circle */
  ycenter = h / 2;
  radius  = (h - 30) / (AspectRatio * 2);
  step    = 360 / MAXPTS;               /* Determine # of increments    */

  angle = 0;                            /* Begin at zero degrees        */
  for( i=0 ; i<MAXPTS ; ++i ){          /* Determine circle intercepts  */
    rads = (double)angle * PI / 180.0;  /* Convert angle to radians     */
    points[i].x = xcenter + (int)( cos(rads) * radius );
    points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );
    angle += step;                      /* Move to next increment       */
  }

  circle( xcenter, ycenter, radius );   /* Draw bounding circle         */

  for( i=0 ; i<MAXPTS ; ++i ){          /* Draw the cords to the circle */
    for( j=i ; j<MAXPTS ; ++j ){        /* For each remaining intersect */
      moveto(points[i].x, points[i].y); /* Move to beginning of cord    */
      lineto(points[j].x, points[j].y); /* Draw the cord                */
    }
  }

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      LINESTYLEDEMO: Display a pattern using all of the standard      */
/*      line styles that are available.                                 */
/*                                                                      */

void LineStyleDemo(void)
{
  int style, step;
  int x, y, w;
  struct viewporttype vp;
  char buffer[40];

  MainWindow( "Pre-defined line styles" );

  getviewsettings( &vp );
  w = vp.right  - vp.left;

  x = 35;
  y = 10;
  step = w / 11;

  settextjustify( LEFT_TEXT, TOP_TEXT );
  outtextxy( x, y, "Normal Width" );

  settextjustify( CENTER_TEXT, TOP_TEXT );

  for( style=0 ; style<4 ; ++style ){
    setlinestyle( style, 0, NORM_WIDTH );
    line( x, y+20, x, vp.bottom-40 );
    itoa( style, buffer, 10 );
    outtextxy( x, vp.bottom-30, buffer );
    x += step;
  }

  x += 2 * step;

  settextjustify( LEFT_TEXT, TOP_TEXT );
  outtextxy( x, y, "Thick Width" );
  settextjustify( CENTER_TEXT, TOP_TEXT );

  for( style=0 ; style<4 ; ++style ){
    setlinestyle( style, 0, THICK_WIDTH );
    line( x, y+20, x, vp.bottom-40 );
    itoa( style, buffer, 10 );
    outtextxy( x, vp.bottom-30, buffer );
    x += step;
  }

  settextjustify( LEFT_TEXT, TOP_TEXT );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      CRTMODEDEMO: Demonstrate the effects of the change mode         */
/*      commands on the current screen.                                 */
/*                                                                      */

void CRTModeDemo(void)
{
  struct viewporttype vp;
  int mode;

  MainWindow( "SetGraphMode / RestoreCRTMode demo" );
  getviewsettings( &vp );
  mode = getgraphmode();
  settextjustify( CENTER_TEXT, CENTER_TEXT );

  outtextxy( (vp.right-vp.left)/2, (vp.bottom-vp.top)/2,
  "Now you are in graphics mode..." );
  StatusLine( "Press any key for text mode..." );
  getch();

  restorecrtmode();
  printf( "Now you are in text mode.\n\n" );
  printf( "Press any key to go back to graphics..." );
  getch();

  setgraphmode( mode );
  MainWindow( "SetGraphMode / RestoreCRTMode demo" );
  settextjustify( CENTER_TEXT, CENTER_TEXT );
  outtextxy( (vp.right-vp.left)/2, (vp.bottom-vp.top)/2,
  "Back in Graphics Mode..." );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      USERLINESTYLEDEMO: Display line styles showing the user         */
/*      defined line style functions.                                   */
/*                                                                      */

void UserLineStyleDemo(void)
{
  int x, y, i, h, flag;
  unsigned int style;
  struct viewporttype vp;

  MainWindow( "User defined line styles" );

  getviewsettings( &vp );
  h = vp.bottom - vp.top;

  x = 4;
  y = 10;
  style = 0;
  i = 0;

  settextjustify( CENTER_TEXT, TOP_TEXT );
  flag = TRUE;                          /* Set the bits in this pass    */

  while( x < vp.right-2 ){              /* Draw lines across the screen */

    if( flag )                          /* If flag, set bits...         */
      style = style | (1 << i);         /*    Set the Ith bit in word   */
    else                                /* If no flag, clear bits       */
    style = style & !(0x8000 >> i);     /*    Clear the Ith bit in word */

    setlinestyle( USERBIT_LINE, style, NORM_WIDTH );
    line( x, y, x, h-y );               /* Draw the new line pattern    */

    x += 5;                             /* Move the X location of line  */
    i = ++i % 16;                       /* Advance to next bit pattern  */

    if( style == 0xffff ){              /* Are all bits set?            */
      flag = FALSE;                     /*   begin removing bits        */
      i = 0;                            /* Start with whole pattern     */
    }
    else{                               /* Bits not all set...          */
      if( style == 0 )                  /* Are all bits clear?          */
	flag = TRUE;                    /*   begin setting bits         */
    }
  }

  settextjustify( LEFT_TEXT, TOP_TEXT );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      FILLSTYLEDEMO: Display the standard fill patterns available.    */
/*                                                                      */

void FillStyleDemo(void)
{
  int h, w, style;
  int i, j, x, y;
  struct viewporttype vp;
  char buffer[40];

  MainWindow( "Pre-defined Fill Styles" );

  getviewsettings( &vp );
  w = 2 * ((vp.right  +  1) / 13);
  h = 2 * ((vp.bottom - 10) / 10);

  x = w / 2;
  y = h / 2;            /* Leave 1/2 blk margin         */
  style = 0;

  for( j=0 ; j<3 ; ++j ){               /* Three rows of boxes          */
    for( i=0 ; i<4 ; ++i ){             /* Four column of boxes         */
      setfillstyle(style, MaxColors-1); /* Set the fill style and WHITE */
      bar( x, y, x+w, y+h );            /* Draw the actual box          */
      rectangle( x, y, x+w, y+h );      /* Outline the box              */
      itoa( style, buffer, 10 );        /* Convert style 3 to ASCII     */
      outtextxy( x+(w / 2), y+h+4, buffer );
      ++style;                          /* Go on to next style #        */
      x += (w / 2) * 3;                 /* Go to next column            */
    }                           /* End of coulmn loop           */
    x = w / 2;                          /* Put base back to 1st column  */
    y += (h / 2) * 3;                   /* Advance to next row          */
  }                                     /* End of Row loop              */

  settextjustify( LEFT_TEXT, TOP_TEXT );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      FILLPATTERNDEMO: Demonstrate how to use the user definable      */
/*      fill patterns.                                                  */
/*                                                                      */

void FillPatternDemo(void)
{
  int style;
  int h, w;
  int x, y, i, j;
  char buffer[40];
  struct viewporttype vp;
  static char patterns[][8] = {
    { 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55 },
    { 0x33, 0x33, 0xCC, 0xCC, 0x33, 0x33, 0xCC, 0xCC },
    { 0xF0, 0xF0, 0xF0, 0xF0, 0x0F, 0x0F, 0x0F, 0x0F },
    { 0x00, 0x10, 0x28, 0x44, 0x28, 0x10, 0x00, 0x00 },
    { 0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00 },
    { 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00 },
    { 0x00, 0x00, 0x3C, 0x3C, 0x3C, 0x3C, 0x00, 0x00 },
    { 0x00, 0x7E, 0x7E, 0x7E, 0x7E, 0x7E, 0x7E, 0x00 },
    { 0x00, 0x00, 0x22, 0x08, 0x00, 0x22, 0x1C, 0x00 },
    { 0xFF, 0x7E, 0x3C, 0x18, 0x18, 0x3C, 0x7E, 0xFF },
    { 0x00, 0x10, 0x10, 0x7C, 0x10, 0x10, 0x00, 0x00 },
    { 0x00, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x00 }
  };

  MainWindow( "User Defined Fill Styles" );

  getviewsettings( &vp );
  w = 2 * ((vp.right  +  1) / 13);
  h = 2 * ((vp.bottom - 10) / 10);

  x = w / 2;
  y = h / 2;            /* Leave 1/2 blk margin         */
  style = 0;

  for( j=0 ; j<3 ; ++j ){               /* Three rows of boxes          */
    for( i=0 ; i<4 ; ++i ){             /* Four column of boxes         */
      setfillpattern( &patterns[style][0], MaxColors-1 );
      bar( x, y, x+w, y+h );            /* Draw the actual box          */
      rectangle( x, y, x+w, y+h );      /* Outline the box              */
      itoa( style, buffer, 10 );        /* Convert style 3 to ASCII     */
      outtextxy( x+(w / 2), y+h+4, buffer );
      ++style;                          /* Go on to next style #        */
      x += (w / 2) * 3;                 /* Go to next column            */
    }                           /* End of coulmn loop           */
    x = w / 2;                          /* Put base back to 1st column  */
    y += (h / 2) * 3;                   /* Advance to next row          */
  }                                     /* End of Row loop              */

  settextjustify( LEFT_TEXT, TOP_TEXT );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      POLYDEMO: Display a random pattern of polygons on the screen    */
/*      until the user says enough.                                     */
/*                                                                      */

void PaletteDemo(void)
{
  int i, j, x, y, color;
  struct viewporttype vp;
  int height, width;

  MainWindow( "Palette Demonstration" );
  StatusLine( "Press any key to continue, ESC to Abort" );

  getviewsettings( &vp );
  width  = (vp.right - vp.left) / 15;   /* get width of the box         */
  height = (vp.bottom - vp.top) / 10;   /* Get the height of the box    */

  x = y = 0;                            /* Start in upper corner        */
  color = 1;                            /* Begin at 1st color           */

  for( j=0 ; j<10 ; ++j ){              /* For 10 rows of boxes         */
    for( i=0 ; i<15 ; ++i ){            /* For 15 columns of boxes      */
      setfillstyle( SOLID_FILL, color++ );      /* Set the color of box */
      bar( x, y, x+width, y+height );           /* Draw the box         */
      x += width + 1;                           /* Advance to next col  */
      color = 1 + (color % (MaxColors - 2));    /* Set new color        */
    }                           /* End of COLUMN loop           */
    x = 0;                              /* Goto 1st column              */
    y += height + 1;                    /* Goto next row                */
  }                                     /* End of ROW loop              */

  while( !kbhit() ){                    /* Until user enters a key...   */
    setpalette( 1+random(MaxColors - 2), random( 65 ) );
  }

  setallpalette( &palette );

  Pause();                              /* Wait for user's response     */

}

/*                                                                      */
/*      POLYDEMO: Display a random pattern of polygons on the screen    */
/*      until the user says enough.                                     */
/*                                                                      */

#define MaxPts          6               /* Maximum # of pts in polygon  */

void PolyDemo(void)
{
  struct PTS poly[ MaxPts ];            /* Space to hold datapoints     */
  int color;                            /* Current drawing color        */
  int i;

  MainWindow( "DrawPoly / FillPoly Demonstration" );
  StatusLine( "ESC Aborts - Press a Key to stop" );

  while( !kbhit() ){                    /* Repeat until a key is hit    */

    color = 1 + random( MaxColors-1 );  /* Get a random color # (no blk)*/
    setfillstyle( random(10), color );  /* Set a random line style      */
    setcolor( color );                  /* Set the desired color        */

    for( i=0 ; i<(MaxPts-1) ; i++ ){    /* Determine a random polygon   */
      poly[i].x = random( MaxX );       /* Set the x coord of point     */
      poly[i].y = random( MaxY );       /* Set the y coord of point     */
    }

    poly[i].x = poly[0].x;              /* last point = first point     */
    poly[i].y = poly[1].y;

    fillpoly( MaxPts, (int far *)poly );    /* Draw the actual polygon      */
  }                                     /* End of WHILE not KBHIT       */

  Pause();                              /* Wait for user's response     */

}


/*                                                                      */
/*      SAYGOODBYE: Give a closing screen to the user before leaving.   */
/*                                                                      */

void SayGoodbye(void)
{
  struct viewporttype viewinfo;         /* Structure to read viewport   */
  int h, w;

  MainWindow( "== Finale ==" );

  getviewsettings( &viewinfo );         /* Read viewport settings       */
  changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
  settextjustify( CENTER_TEXT, CENTER_TEXT );

  h = viewinfo.bottom - viewinfo.top;
  w = viewinfo.right  - viewinfo.left;
  outtextxy( w/2, h/2, "That's all, folks!" );

  StatusLine( "Press any key to EXIT" );
  getch();

  cleardevice();                        /* Clear the graphics screen    */

}

/*                                                                      */
/*      PAUSE: Pause until the user enters a keystroke. If the          */
/*      key is an ESC, then exit program, else simply return.           */
/*                                                                      */

void Pause(void)
{
  static char msg[] = "Esc aborts or press a key...";
  int c;

  StatusLine( msg );                    /* Put msg at bottom of screen  */

  c = getch();                          /* Read a character from kbd    */

  if( ESC == c ){                       /* Does user wish to leave?     */
    closegraph();                       /* Change to text mode          */
    exit( 1 );                          /* Return to OS                 */
  }

  if( 0 == c ){                         /* Did use hit a non-ASCII key? */
    c = getch();                        /* Read scan code for keyboard  */
  }

  cleardevice();                        /* Clear the screen             */

}

/*                                                                      */
/*      MAINWINDOW: Establish the main window for the demo and set      */
/*      a viewport for the demo code.                                   */
/*                                                                      */

void MainWindow( char *header )
{
  int height;

  cleardevice();                        /* Clear graphics screen        */
  setcolor( MaxColors - 1 );            /* Set current color to white   */
  setviewport( 0, 0, MaxX, MaxY, 1 );   /* Open port to full screen     */

  height = textheight( "H" );           /* Get basic text height        */

  changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
  settextjustify( CENTER_TEXT, TOP_TEXT );
  outtextxy( MaxX/2, 2, header );
  setviewport( 0, height+4, MaxX, MaxY-(height+4), 1 );
  DrawBorder();
  setviewport( 1, height+5, MaxX-1, MaxY-(height+5), 1 );

}

/*                                                                      */
/*      STATUSLINE: Display a status line at the bottom of the screen.  */
/*                                                                      */

void StatusLine( char *msg )
{
  int height;

  setviewport( 0, 0, MaxX, MaxY, 1 );   /* Open port to full screen     */
  setcolor( MaxColors - 1 );            /* Set current color to white   */

  changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
  settextjustify( CENTER_TEXT, TOP_TEXT );
  setlinestyle( SOLID_LINE, 0, NORM_WIDTH );
  setfillstyle( EMPTY_FILL, 0 );

  height = textheight( "H" );           /* Detemine current height      */
  bar( 0, MaxY-(height+4), MaxX, MaxY );
  rectangle( 0, MaxY-(height+4), MaxX, MaxY );
  outtextxy( MaxX/2, MaxY-(height+2), msg );
  setviewport( 1, height+5, MaxX-1, MaxY-(height+5), 1 );

}

/*                                                                      */
/*      DRAWBORDER: Draw a solid single line around the current         */
/*      viewport.                                                       */
/*                                                                      */

void DrawBorder(void)
{
  struct viewporttype vp;

  setcolor( MaxColors - 1 );            /* Set current color to white   */

  setlinestyle( SOLID_LINE, 0, NORM_WIDTH );

  getviewsettings( &vp );
  rectangle( 0, 0, vp.right-vp.left, vp.bottom-vp.top );

}

/*                                                                      */
/*      CHANGETEXTSTYLE: similar to settextstyle, but checks for        */
/*      errors that might occur whil loading the font file.             */
/*                                                                      */

void changetextstyle(int font, int direction, int charsize)
{
  int ErrorCode;

  graphresult();                        /* clear error code             */
  settextstyle(font, direction, charsize);
  ErrorCode = graphresult();            /* check result                 */
  if( ErrorCode != grOk ){              /* if error occured             */
    closegraph();
    printf(" Graphics System Error: %s\n", grapherrormsg( ErrorCode ) );
    exit( 1 );
  }
}

/*                                                                      */
/*      GPRINTF: Used like PRINTF except the output is sent to the      */
/*      screen in graphics mode at the specified co-ordinate.           */
/*                                                                      */

int gprintf( int *xloc, int *yloc, char *fmt, ... )
{
  va_list  argptr;                      /* Argument list pointer        */
  char str[140];                        /* Buffer to build sting into   */
  int cnt;                              /* Result of SPRINTF for return */

  va_start( argptr, fmt );              /* Initialize va_ functions     */

  cnt = vsprintf( str, fmt, argptr );   /* prints string to buffer      */
  outtextxy( *xloc, *yloc, str );       /* Send string in graphics mode */
  *yloc += textheight( "H" ) + 2;       /* Advance to next line         */

  va_end( argptr );                     /* Close va_ functions          */

  return( cnt );                        /* Return the conversion count  */

}
