bgidemo.c

C语言开发工具,很常用的开发工具,实用性很强的

  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	*/

}