User Tools

Site Tools


c:graphics.h:setvisualpage

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

c:graphics.h:setvisualpage [2015/05/06 23:06] (current)
Line 1: Line 1:
 +===== setvisualpage =====
 +
 +
 +====Syntax of setvisualpage ==== 
 + <code c>
 +#include <graphics.h>
 +void setvisualpage(int page);
 +  </code>
 +
 +
 +==== Description of setvisualpage ==== 
 +<code c>
 +setvisualpage makes page the visual graphics page.
 +</code>
 +
 +
 +==== Example of setvisualpage ====
 +<code c>
 +/* setvisualpage example */
 +
 +#include <graphics.h>
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <conio.h>
 +
 +int main(void)
 +{
 +   /* select driver and mode that supports multiple pages */
 +   int gdriver = EGA, gmode = EGAHI, errorcode;
 +   int x, y, 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 */
 +   }
 +
 +   x = getmaxx() / 2;
 +   y = getmaxy() / 2;
 +   ht = textheight("W");
 +
 +   /*  select the off screen page for drawing */
 +   setactivepage(1);
 +
 +   /* draw a line on page #1 */
 +   line(0, 0, getmaxx(), getmaxy());
 +
 +   /* output a message on page #1 */
 +   settextjustify(CENTER_TEXT, CENTER_TEXT);
 +   outtextxy(x, y, "This is page #1:");
 +   outtextxy(x, y+ht, "Press any key to halt:");
 +
 +
 +   /* select drawing to page #0 */
 +   setactivepage(0);
 +
 +   /* output a message  on page #0 */
 +   outtextxy(x, y, "This is page #0.");
 +   outtextxy(x, y+ht, "Press any key to view page #1:");
 +   getch();
 +
 +   /* select page #1 as the visible page */
 +   setvisualpage(1);
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[graphresult]]
 +[[setactivepage]]
 +[[swapbuffers]]
 +
 +
 +===== output of setvisualpage example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
advertising
c/graphics.h/setvisualpage.txt · Last modified: 2015/05/06 23:06 (external edit)

Impressum Datenschutz