c:graphics.h:setvisualpage
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c:graphics.h:setvisualpage [2024/02/16 01:05] (current) |
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| + | ===== 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... | ||
| + | |||
| + | |||
on the occasion of the current invasion of Russia in Ukraine
c/graphics.h/setvisualpage.txt · Last modified: 2024/02/16 01:05 (external edit)
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