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c:graphics.h:arc

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c:graphics.h:arc [2015/05/06 23:06] (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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c/graphics.h/arc.txt · Last modified: 2015/05/06 23:06 (external edit)

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