c:graphics.h:arc
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c:graphics.h:arc [2015/05/06 23:06] |
c:graphics.h:arc [2024/02/16 01:05] (current) |
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| + | ===== arc ===== | ||
| + | |||
| + | |||
| + | ====Syntax of arc ==== | ||
| + | <code c> | ||
| + | #include <graphics.h> | ||
| + | void arc(int x, int y, int stangle, int endangle, int radius); | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Description of arc ==== | ||
| + | <code c> | ||
| + | arc draws a circular arc in the current drawing color centered at (x,y) | ||
| + | with a radius given by radius. The arc travels from stangle to endangle. | ||
| + | If stangle equals 0 and endangle equals 360, the call to arc draws a | ||
| + | complete circle. | ||
| + | The angle for arc is reckoned counterclockwise, with 0 degrees at 3 | ||
| + | o'clock, 90 degrees at 12 o'clock, and so on. | ||
| + | The linestyle parameter does not affect arcs, circles, ellipses, or pie | ||
| + | slices. Only the thickness parameter is used. | ||
| + | If you are using a CGA in high resolution mode or a monochrome graphics | ||
| + | adapter, the examples in online Help that show how to use graphics | ||
| + | functions might not produce the expected results. If your system runs on | ||
| + | a CGA or monochrome adapter, pass the value 1 to those functions that | ||
| + | alter the fill or drawing color (setcolor, setfillstyle, and | ||
| + | setlinestyle, for example), instead of a symbolic color constant (defined | ||
| + | in graphics.h). | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Example of arc ==== | ||
| + | <code c> | ||
| + | /* arc example */ | ||
| + | |||
| + | #include <graphics.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <stdio.h> | ||
| + | #include <conio.h> | ||
| + | |||
| + | int main(void) | ||
| + | { | ||
| + | /* request autodetection */ | ||
| + | int gdriver = DETECT, gmode, errorcode; | ||
| + | int midx, midy; | ||
| + | int stangle = 45, endangle = 135; | ||
| + | int radius = 100; | ||
| + | |||
| + | /* 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()); | ||
| + | |||
| + | /* draw arc */ | ||
| + | arc(midx, midy, stangle, endangle, radius); | ||
| + | |||
| + | /* clean up */ | ||
| + | getch(); | ||
| + | closegraph(); | ||
| + | return 0; | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== See also ==== | ||
| + | [[circle]] | ||
| + | [[ellipse]] | ||
| + | [[fillellipse]] | ||
| + | [[getarcoords]] | ||
| + | [[getaspectratio]] | ||
| + | [[pieslice]] | ||
| + | [[sector]] | ||
| + | |||
| + | |||
| + | ===== output of arc example ===== | ||
| + | |||
| + | no output of example at the moment | ||
| + | do not hesitate and add it... | ||
| + | |||
| + | |||
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