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c:graphics.h:clearviewport [2015/05/06 23:06] (current)
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 +===== clearviewport =====
 +
 +
 +====Syntax of clearviewport ==== 
 + <code c>
 +#include <graphics.h>
 +void clearviewport(void);
 +  </code>
 +
 +
 +==== Description of clearviewport ==== 
 +<code c>
 +clearviewport erases the viewport and moves the CP (current position) to
 +home (0,0), relative to the viewport.
 +</code>
 +
 +
 +==== Example of clearviewport ====
 +<code c>
 +/* clearviewport 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, ht;
 +
 +   /* 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());
 +   ht = textheight("W");
 +
 +   /* 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 messages */
 +   outtextxy(0, 0, "* <-- (0, 0) in smaller viewport");
 +
 +   outtextxy(0, 2*ht, "Press any key to clear viewport:");
 +
 +   getch();   /* wait for a key */
 +   clearviewport();   /* clear the viewport */
 +   /* output another message */
 +   outtextxy(0, 0, "Press any key to quit:");
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[cleardevice]]
 +[[getviewsettings]]
 +[[setviewport]]
 +
 +
 +===== output of clearviewport example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/clearviewport.txt · Last modified: 2015/05/06 23:06 (external edit)

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