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c:graphics.h:drawpoly [2015/05/06 23:06] (current)
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 +===== drawpoly =====
 +
 +
 +====Syntax of drawpoly ==== 
 + <code c>
 +#include <graphics.h>
 +void drawpoly(int numpoints, int *polypoints);
 +  </code>
 +
 +
 +==== Description of drawpoly ==== 
 +<code c>
 +drawpoly draws a polygon with numpoints points, using the current line
 +style and color.
 +*polypoints points to a sequence of (numpoints * 2) integers. Each pair
 +of integers gives the x- and y-coordinates of a point on the polygon.
 +In order to draw a closed figure with n vertices, you must pass n + 1
 +coordinates to drawpoly where the nth coordinate is equal to the 0th.
 +</code>
 +
 +
 +==== Example of drawpoly ====
 +<code c>
 +/* drawpoly example */
 +
 +#include <graphics.h>
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <conio.h>
 +
 +int main(void)
 +{
 +   /* request autodetection */
 +   int gdriver = DETECT, gmode, errorcode;
 +   int maxx, maxy;
 +
 +   int poly[10];   /* our polygon array */
 +
 +   /* 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 */
 +   }
 +
 +   maxx = getmaxx();
 +   maxy = getmaxy();
 +   poly[0] = 20;     /* first vertex */
 +   poly[1] = maxy / 2;
 +   poly[2] = maxx - 20;    /* second vertex */
 +   poly[3] = 20;
 +   poly[4] = maxx - 50;    /* third vertex */
 +   poly[5] = maxy - 20;
 +   poly[6] = maxx / 2;     /* fourth vertex */
 +   poly[7] = maxy / 2;
 +   poly[8] = poly[0];/* drawpoly doesn't automatically close */
 +
 +   poly[9] = poly[1];/* the polygon, so we close it */
 +
 +   drawpoly(5, poly);   /* draw the polygon */
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[fillpoly]]
 +[[floodfill]]
 +[[graphresult]]
 +[[setwritemode]]
 +
 +
 +===== output of drawpoly example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/drawpoly.txt · Last modified: 2015/05/06 23:06 (external edit)

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