three.cad/wasm/solver.c

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/*-----------------------------------------------------------------------------
* Some sample code for slvs.dll. We draw some geometric entities, provide
* initial guesses for their positions, and then constrain them. The solver
* calculates their new positions, in order to satisfy the constraints.
*
* Copyright 2008-2013 Jonathan Westhues.
*---------------------------------------------------------------------------*/
#ifdef WIN32
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#include <windows.h>
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#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "slvs.h"
static Slvs_System sys;
static void *CheckMalloc(size_t n)
{
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void *r = malloc(n);
if (!r)
{
printf("out of memory!\n");
exit(-1);
}
return r;
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}
/*-----------------------------------------------------------------------------
* An example of a constraint in 3d. We create a single group, with some
* entities and constraints.
*---------------------------------------------------------------------------*/
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int solver(int nLines, float *ptr)
{
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float *buf_pt_start = ptr;
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Slvs_hGroup g;
double qw, qx, qy, qz;
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g = 1;
/* First, we create our workplane. Its origin corresponds to the origin
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* of our base frame (x y z) = (0 0 0) */
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sys.param[sys.params++] = Slvs_MakeParam(1, g, 0.0);
sys.param[sys.params++] = Slvs_MakeParam(2, g, 0.0);
sys.param[sys.params++] = Slvs_MakeParam(3, g, 0.0);
sys.entity[sys.entities++] = Slvs_MakePoint3d(101, g, 1, 2, 3);
/* and it is parallel to the xy plane, so it has basis vectors (1 0 0)
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* and (0 1 0). */
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Slvs_MakeQuaternion(1, 0, 0,
0, 1, 0, &qw, &qx, &qy, &qz);
sys.param[sys.params++] = Slvs_MakeParam(4, g, qw);
sys.param[sys.params++] = Slvs_MakeParam(5, g, qx);
sys.param[sys.params++] = Slvs_MakeParam(6, g, qy);
sys.param[sys.params++] = Slvs_MakeParam(7, g, qz);
sys.entity[sys.entities++] = Slvs_MakeNormal3d(102, g, 4, 5, 6, 7);
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sys.entity[sys.entities++] = Slvs_MakeWorkplane(200, g, 101, 102);
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/* Now create a second group. We'll solve group 2, while leaving group 1
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* constant; so the workplane that we've created will be locked down,
* and the solver can't move it. */
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g = 2;
/* These points are represented by their coordinates (u v) within the
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* workplane, so they need only two parameters each. */
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int p_start = sys.params;
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Slvs_hParam ph = 11, ph_s = 11;
Slvs_hParam vh = 301, vh_s = 301;
Slvs_hParam lh = 400, lh_s = 400;
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Slvs_hParam con_id = 1;
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for (int i = 0; i < nLines * 2; i++)
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{
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sys.param[sys.params++] = Slvs_MakeParam(ph++, g, (float)*ptr++);
sys.param[sys.params++] = Slvs_MakeParam(ph++, g, (float)*ptr++);
sys.entity[sys.entities++] = Slvs_MakePoint2d(vh++, g, 200, ph - 1, ph - 2);
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if (i % 2 == 1)
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{
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sys.entity[sys.entities++] = Slvs_MakeLineSegment(lh++, g,
200, vh - 1, vh - 2);
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}
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else if (i > 0)
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{
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sys.constraint[sys.constraints++] = Slvs_MakeConstraint(
con_id++, g,
SLVS_C_POINTS_COINCIDENT,
200,
0.0,
vh - 1, vh - 2, 0, 0);
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}
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}
/* And solve. */
Slvs_Solve(&sys, g);
if (sys.result == SLVS_RESULT_OKAY)
{
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// printf("solved okay\n");
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for (int i = 0; i < nLines * 4; i++)
{
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*buf_pt_start++ = (float)sys.param[p_start++].val;
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}
}
else
{
int i;
printf("solve failed: problematic constraints are:");
for (i = 0; i < sys.faileds; i++)
{
printf(" %d", sys.failed[i]);
}
printf("\n");
if (sys.result == SLVS_RESULT_INCONSISTENT)
{
printf("system inconsistent\n");
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}
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else
{
printf("system nonconvergent\n");
}
}
sys.params = sys.constraints = sys.entities = 0;
return 0;
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}
int main(int argc, char *argv[])
{
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sys.param = CheckMalloc(50 * sizeof(sys.param[0]));
sys.entity = CheckMalloc(50 * sizeof(sys.entity[0]));
sys.constraint = CheckMalloc(50 * sizeof(sys.constraint[0]));
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sys.failed = CheckMalloc(50 * sizeof(sys.failed[0]));
sys.faileds = 50;
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// Example2d(150.0);
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printf("hello\n");
return 0;
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}