c:graphics.h:getarccoords
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c:graphics.h:getarccoords [2015/05/06 23:06] |
c:graphics.h:getarccoords [2024/02/16 01:05] (current) |
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| + | ===== getarccoords ===== | ||
| + | |||
| + | |||
| + | ====Syntax of getarccoords ==== | ||
| + | <code c> | ||
| + | #include <graphics.h> | ||
| + | void getarccoords(struct arccoordstype *arccoords); | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Description of getarccoords ==== | ||
| + | <code c> | ||
| + | getarccoords fills in the arccoordstype structure pointed to by arccoords | ||
| + | with information about the last call to arc. The arccoordstype structure | ||
| + | is defined in graphics.h as follows: | ||
| + | struct arccoordstype { | ||
| + | int x, y; | ||
| + | int xstart, ystart, xend, yend; | ||
| + | }; | ||
| + | The members of this structure are used to specify the center point (x,y), | ||
| + | the starting position (xstart, ystart), and the ending position (xend, | ||
| + | yend) of the arc. These values are useful if you need to make a line meet | ||
| + | at the end of an arc. | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Example of getarccoords ==== | ||
| + | <code c> | ||
| + | /* getarccoords example */ | ||
| + | |||
| + | #include <graphics.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <stdio.h> | ||
| + | #include <conio.h> | ||
| + | |||
| + | int main(void) | ||
| + | { | ||
| + | /* request autodetection */ | ||
| + | int gdriver = DETECT, gmode, errorcode; | ||
| + | struct arccoordstype arcinfo; | ||
| + | int midx, midy; | ||
| + | int stangle = 45, endangle = 270; | ||
| + | char sstr[80], estr[80]; | ||
| + | |||
| + | /* 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; | ||
| + | |||
| + | /* draw arc and get coordinates */ | ||
| + | setcolor(getmaxcolor()); | ||
| + | arc(midx, midy, stangle, endangle, 100); | ||
| + | getarccoords(&arcinfo); | ||
| + | |||
| + | /* convert arc information into strings */ | ||
| + | sprintf(sstr, "*- (%d, %d)", arcinfo.xstart, arcinfo.ystart); | ||
| + | |||
| + | sprintf(estr, "*- (%d, %d)", arcinfo.xend, arcinfo.yend); | ||
| + | |||
| + | /* output the arc information */ | ||
| + | outtextxy(arcinfo.xstart, arcinfo.ystart, sstr); | ||
| + | outtextxy(arcinfo.xend, arcinfo.yend, estr); | ||
| + | |||
| + | /* clean up */ | ||
| + | getch(); | ||
| + | closegraph(); | ||
| + | return 0; | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== See also ==== | ||
| + | [[arc]] | ||
| + | [[fillellipse]] | ||
| + | [[sector]] | ||
| + | |||
| + | |||
| + | ===== output of getarccoords example ===== | ||
| + | |||
| + | no output of example at the moment | ||
| + | do not hesitate and add it... | ||
| + | |||
| + | |||
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