example/steps/p4est_step1.c File Reference

This 2D example program refines a domain based on given image data. More...

#include <p4est_vtk.h>
#include "hw32.h"

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Defines
#define	P4EST_STEP1_PATTERN_LEVEL   5
	The resolution of the image data in powers of two.
#define	P4EST_STEP1_PATTERN_LENGTH   (1 << P4EST_STEP1_PATTERN_LEVEL)
	The dimension of the image data.
Functions
static int	refine_fn (p4est_t *p4est, p4est_topidx_t which_tree, p4est_quadrant_t *quadrant)
	Callback function to decide on refinement.
int	main (int argc, char **argv)
	The main function of the step1 example program.
Variables
static const int	plv = P4EST_STEP1_PATTERN_LEVEL
	Shortcut.
static const int	ple = P4EST_STEP1_PATTERN_LENGTH
	Shortcut.

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Detailed Description

This 2D example program refines a domain based on given image data.

The image file hw32.h has been created with the GIMP and is compiled in.

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Define Documentation

#define P4EST_STEP1_PATTERN_LENGTH   (1 << P4EST_STEP1_PATTERN_LEVEL)

The dimension of the image data.

#define P4EST_STEP1_PATTERN_LEVEL   5

The resolution of the image data in powers of two.

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Function Documentation

int main	(	int	argc,
		char **	argv
	)

The main function of the step1 example program.

It creates a connectivity and forest, refines it, and writes a VTK file.

static int refine_fn	(	p4est_t *	p4est,
		p4est_topidx_t	which_tree,
		p4est_quadrant_t *	quadrant
	)		[static]

Callback function to decide on refinement.

Refinement and coarsening is controlled by callback functions. This function is called for every processor-local quadrant in order; its return value is understood as a boolean refinement flag. In this example we use the image file hw32.h to determine the refinement.