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c:graphics.h:setviewport

setviewport

Syntax of setviewport

#include <graphics.h>
void setviewport(int left, int top, int right, int bottom, int clip);
 

Description of setviewport

setviewport establishes a new viewport for graphics output.
The viewport corners are given in absolute screen coordinates by
(left,top) and (right,bottom). The current position (CP) is moved to
(0,0) in the new window.
The parameter clip determines whether drawings are clipped (truncated) at
the current viewport boundaries. If clip is nonzero, all drawings will be
clipped to the current viewport.

Example of setviewport

/* setviewport example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
#define CLIP_ON 1/* activates clipping in viewport */
 
int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
 
 
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk)    /* an error occurred */
   {
printf("Graphics error: %s\n", grapherrormsg(errorcode));
 
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
   }
 
   setcolor(getmaxcolor());
 
   /* message in default full-screen viewport */
   outtextxy(0, 0, "* <-- (0, 0) in default viewport");
 
   /* create a smaller viewport */
   setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);
 
   /* display some text */
   outtextxy(0, 0, "* <-- (0, 0) in smaller viewport");
 
   /* clean up */
   getch();
 
   closegraph();
   return 0;
}

See also

output of setviewport example

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c/graphics.h/setviewport.txt · Last modified: 2015/05/06 23:06 (external edit)

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