c:graphics.h:getaspectration
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c:graphics.h:getaspectration [2015/05/06 23:06] |
c:graphics.h:getaspectration [2024/02/16 01:05] (current) |
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| + | ===== getaspectration ===== | ||
| + | |||
| + | |||
| + | ====Syntax of getaspectration ==== | ||
| + | <code c> | ||
| + | #include <graphics.h> | ||
| + | void getaspectratio(int *xasp, int *yasp); | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Description of getaspectration ==== | ||
| + | <code c> | ||
| + | The y aspect factor, *yasp, is normalized to 10,000. On all graphics | ||
| + | adapters except the VGA, *xasp (the x aspect factor) is less than *yasp | ||
| + | because the pixels are taller than they are wide. On the VGA, which has | ||
| + | "square" pixels, *xasp equals *yasp. In general, the relationship between | ||
| + | *yasp and *xasp can be stated as | ||
| + | *yasp = 10,000 | ||
| + | *xasp <= 10,000 | ||
| + | getaspectratio gets the values in *xasp and *yasp. | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Example of getaspectration ==== | ||
| + | <code c> | ||
| + | /* getaspectratio example */ | ||
| + | |||
| + | #include <graphics.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <stdio.h> | ||
| + | #include <conio.h> | ||
| + | |||
| + | main() | ||
| + | { | ||
| + | /* request autodetection */ | ||
| + | int gdriver = DETECT, gmode, errorcode; | ||
| + | int xasp, yasp, midx, midy; | ||
| + | |||
| + | |||
| + | /* 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 */ | ||
| + | } | ||
| + | |||
| + | midx = getmaxx() / 2; | ||
| + | midy = getmaxy() / 2; | ||
| + | setcolor(getmaxcolor()); | ||
| + | |||
| + | /* get current aspect ratio settings */ | ||
| + | getaspectratio(&xasp, &yasp); | ||
| + | |||
| + | /* draw normal circle */ | ||
| + | circle(midx, midy, 100); | ||
| + | getch(); | ||
| + | |||
| + | /* draw wide circle */ | ||
| + | cleardevice(); | ||
| + | setaspectratio(xasp/2, yasp); | ||
| + | circle(midx, midy, 100); | ||
| + | getch(); | ||
| + | |||
| + | |||
| + | /* draw narrow circle */ | ||
| + | cleardevice(); | ||
| + | setaspectratio(xasp, yasp/2); | ||
| + | circle(midx, midy, 100); | ||
| + | |||
| + | /* clean up */ | ||
| + | getch(); | ||
| + | closegraph(); | ||
| + | return 0; | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== See also ==== | ||
| + | [[None.]] | ||
| + | |||
| + | |||
| + | ===== output of getaspectration example ===== | ||
| + | |||
| + | no output of example at the moment | ||
| + | do not hesitate and add it... | ||
| + | |||
| + | |||
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