Function:s2sah

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s2sah

Set the style to be used for arrowheads drawn with s2arro.

Prototype

void s2sah(int fs, float angle, float barb);

Description

Set the style to be used for arrowheads drawn with s2arro. Currently, all arrowheads are drawn as cones, with the rendering mode (wireframe or shaded) affecting the look. Line-based arrowheads may be added at a later stage. Argument fs is the fill style: fs = 1: filled fs = 2: outline [not yet implemented] Argument angle [5.0, 135.0] is the angle of the arrow point in degrees, with default value 45.0 (a cone of semi-vertex angle 22.5 degrees). Argument barb [0.05, 1.0] is the fraction of the cone that is cut away from the back, such that 0.05 gives an open cone and 1.0 gives a cone with a solid base, with default value 0.3.

See Also

s2qahQuery the arrow-head style.
s2arro Draw an arrow from the point with world-coordinates (x1,y1,z1) to (x2,y2,z2).

PGPLOT Equivalent

PGSAH

Code Example

#include <stdio.h>
#include <stdlib.h>
#include "s2plot.h"

int main(int argc, char *argv[])
{
   float x1 = -0.3, x2 = +0.5;			/* Arrow coordinates */
   float y1 = +0.2, y2 = +0.1;
   float z1 = -0.4, z2 = +0.8;
   int fs = 1;					/* Arrow fill style */
   float angle = 30.0;				/* Arrow cone head angle */
   float barb = 0.7;				/* Arrow barb level */

   s2opend("/?",argc, argv);			/* Open the display */
   s2swin(-1.,1., -1.,1., -1.,1.);		/* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);	/* Draw coordinate box */

   s2sci(S2_PG_YELLOW);
   s2sah(fs, angle, barb);			/* Set arrow head style */
   s2sch(5);					/* Set size of arrow head */
   s2arro(x1,y1,z1, x2,y2,z2);			/* Draw an arrow */
   s2show(1);					/* Open the s2plot window */
   
   return 1;
}

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