Category : Files from Magazines
Archive   : PJ-VGA.ZIP
Filename : LINEDEMO.C

 
Output of file : LINEDEMO.C contained in archive : PJ-VGA.ZIP
/*
* *** Listing 2 ***
*
* Sample program to illustrate EGA/VGA line drawing routines.
*
* Compiled with Turbo C 2.0.
*
* By Michael Abrash. 2/4/89.
*/
#include /* contains geninterrupt */

#define GRAPHICS_MODE 0x10
#define TEXT_MODE 0x03
#define BIOS_VIDEO_INT 0x10
#define X_MAX 640 /* working screen width */
#define Y_MAX 348 /* working screen height */

extern void EVGALine();

/*
* Subroutine to draw a rectangle full of vectors, of the specified
* length and color, around the specified rectangle center.
*/
void VectorsUp(XCenter, YCenter, XLength, YLength, Color)
int XCenter, YCenter; /* center of rectangle to fill */
int XLength, YLength; /* distance from center to edge
of rectangle */
int Color; /* color to draw lines in */
{
int WorkingX, WorkingY;

/* Lines from center to top of rectangle */
WorkingX = XCenter - XLength;
WorkingY = YCenter - YLength;

for ( ; WorkingX < ( XCenter + XLength ); WorkingX++ )
EVGALine(XCenter, YCenter, WorkingX, WorkingY, Color);

/* Lines from center to right of rectangle */
WorkingX = XCenter + XLength - 1;
WorkingY = YCenter - YLength;
for ( ; WorkingY < ( YCenter + YLength ); WorkingY++ )
EVGALine(XCenter, YCenter, WorkingX, WorkingY, Color);

/* Lines from center to bottom of rectangle */
WorkingX = XCenter + XLength - 1;
WorkingY = YCenter + YLength - 1;
for ( ; WorkingX >= ( XCenter - XLength ); WorkingX-- )
EVGALine(XCenter, YCenter, WorkingX, WorkingY, Color);

/* Lines from center to left of rectangle */
WorkingX = XCenter - XLength;
WorkingY = YCenter + YLength - 1;
for ( ; WorkingY >= ( YCenter - YLength ); WorkingY-- )
EVGALine(XCenter, YCenter, WorkingX, WorkingY, Color );
}

/*
* Sample program to draw four rectangles full of lines.
*/
int main()
{
char temp;

/* Set graphics mode */
_AX = GRAPHICS_MODE;
geninterrupt(BIOS_VIDEO_INT);

/* Draw each of four rectangles full of vectors */
VectorsUp(X_MAX / 4, Y_MAX / 4, X_MAX / 4,
Y_MAX / 4, 1);
VectorsUp(X_MAX * 3 / 4, Y_MAX / 4, X_MAX / 4,
Y_MAX / 4, 2);
VectorsUp(X_MAX / 4, Y_MAX * 3 / 4, X_MAX / 4,
Y_MAX / 4, 3);
VectorsUp(X_MAX * 3 / 4, Y_MAX * 3 / 4, X_MAX / 4,
Y_MAX / 4, 4);

/* Wait for the enter key to be pressed */
scanf("%c", &temp);

/* Back to text mode */
_AX = TEXT_MODE;
geninterrupt(BIOS_VIDEO_INT);
}


  3 Responses to “Category : Files from Magazines
Archive   : PJ-VGA.ZIP
Filename : LINEDEMO.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/